技术领域technical field
本申请涉及气体检测技术领域，更具体地说，涉及一种多点协同激光模组及气体检测系统。The present application relates to the technical field of gas detection, and more specifically, to a multi-point cooperative laser module and a gas detection system.
背景技术Background technique
近些年来，随着空气污染程度的日益加重，雾霾成为困扰我国众多城市的污染源之一。雾霾是对大气中各种悬浮颗粒物韩玲超标的笼统表述，如何检测大气中的悬浮颗粒物是治理雾霾天气的前提条件。In recent years, with the increasing level of air pollution, smog has become one of the pollution sources that plague many cities in our country. Haze is a general expression of various suspended particulates in the atmosphere exceeding the standard. How to detect suspended particulates in the atmosphere is a prerequisite for controlling haze weather.
现今主流的大气悬浮颗粒物浓度的检测方法是光散射法，其理论基础是米氏散射，即入射光遇到待测空气中的悬浮颗粒物会发生散射，被所述悬浮颗粒物散射的散射光的光强分布包含悬浮颗粒物的粒径大小、粒度分布浓度等信息。通过一定方式获得所述散射光的光强信息即可反演出所述悬浮颗粒物的相关信息。基于光散射法的检测系统在检测过程中只需将待测空气采样到气体样品室中，通过光源发送检测光线进入气体样品室中进行测量即可。但是在测量过程中所述检测光线的部分散射光在从气体样品室中出射时会发送全反射现象，进而无法被设置在所述气体样品室出射面一侧的探测装置探测到，而这些被全反射的散射光包含了大量的悬浮颗粒物信息，这些信息的丢失会降低整个检测系统的检测精度和检测数据可靠性。The current mainstream method for detecting the concentration of suspended particulate matter in the atmosphere is the light scattering method. The strong distribution includes information such as particle size and particle size distribution concentration of suspended particles. By obtaining the light intensity information of the scattered light in a certain way, the relevant information of the suspended particles can be retrieved. The detection system based on the light scattering method only needs to sample the air to be tested into the gas sample chamber during the detection process, and send the detection light into the gas sample chamber through the light source for measurement. However, during the measurement process, part of the scattered light of the detection light will send a total reflection phenomenon when it exits the gas sample chamber, and then cannot be detected by the detection device arranged on the exit surface of the gas sample chamber, and these are detected by Totally reflected scattered light contains a large amount of suspended particle information, and the loss of this information will reduce the detection accuracy and reliability of detection data of the entire detection system.
发明内容Contents of the invention
为解决上述技术问题，本发明提供了一种多点协同激光模组及气体检测系统，以解决由于在检测过程中检测光线的部分散射光从气体样品室中出射时被全反射而导致的整个检测系统的检测精度和检测数据可靠性的降低的问题。In order to solve the above technical problems, the present invention provides a multi-point cooperative laser module and a gas detection system to solve the problem caused by the total reflection of part of the scattered light of the detection light when it exits the gas sample chamber during the detection process. The detection accuracy of the detection system and the reduction of the reliability of the detection data.
为解决上述技术问题，本发明实施例提供了如下技术方案：In order to solve the above technical problems, the embodiments of the present invention provide the following technical solutions:
一种多点协同激光模组，应用于基于光散射法的气体检测系统，所述检测系统包括气体样品室；所述多点协同激光模组包括：A multi-point cooperative laser module is applied to a gas detection system based on light scattering method, the detection system includes a gas sample chamber; the multi-point cooperative laser module includes:
封装外壳，所述封装外壳包括出射面；an encapsulation housing comprising an exit face;
设置于所述封装外壳内部的主检测激光器，用于发送主检测激光；The main detection laser arranged inside the packaging shell is used to send the main detection laser;
设置于所述主检测激光器与所述出射面之间的准直扩束系统，用于对所述主检测激光进行准直扩束处理；A collimation and beam expansion system arranged between the main detection laser and the exit surface, for performing collimation and beam expansion processing on the main detection laser;
设置于所述出射面内的傅里叶透镜，用于对经过准直扩束处理后的主检测激光进行逆向傅里叶变换后获得主检测激光，所述主检测激光以正入射的方式进入所述气体样品室；The Fourier lens arranged in the exit surface is used to perform inverse Fourier transform on the main detection laser beam after the collimated beam expansion processing to obtain the main detection laser light, and the main detection laser light enters in the normal incidence mode the gas sample chamber;
设置于所述出射面内的辅助激光器组，所述辅助激光器组包括至少四个辅助检测激光器，所述至少四个辅助检测激光器设置于所述傅里叶透镜四周，用于以斜入射方式向所述气体样品室发送至少四束辅助检测激光；An auxiliary laser group arranged in the exit surface, the auxiliary laser group includes at least four auxiliary detection lasers, and the at least four auxiliary detection lasers are arranged around the Fourier lens for oblique incidence to The gas sample chamber transmits at least four auxiliary detection laser beams;
设置于所述封装外壳内，与所述主检测激光器及辅助激光器组连接的控制装置，用于驱动所述主检测激光器发送主检测激光和用于驱动所述辅助激光器发送至少四束辅助检测激光。The control device arranged in the packaging shell and connected to the main detection laser and the auxiliary laser group is used to drive the main detection laser to send the main detection laser and to drive the auxiliary laser to send at least four auxiliary detection lasers .
优选的，所述控制装置还用于获取所述主检测激光器及辅助激光器组的温度，并将其稳定在预设温度范围内。Preferably, the control device is also used to obtain the temperature of the main detection laser and the auxiliary laser group, and stabilize them within a preset temperature range.
优选的，所述控制装置包括：温度传感器、处理装置、致冷器和驱动电路；其中，Preferably, the control device includes: a temperature sensor, a processing device, a refrigerator and a drive circuit; wherein,
所述驱动电路用于驱动所述主检测激光器发送主检测激光及驱动所述辅助激光器组发送至少四束辅助检测激光，并保持所述主检测激光及所述至少四束辅助检测激光的波长稳定；The drive circuit is used to drive the main detection laser to send the main detection laser and drive the auxiliary laser group to send at least four auxiliary detection lasers, and keep the wavelengths of the main detection laser and the at least four auxiliary detection lasers stable ;
所述温度传感器用于获取所述主检测激光器及辅助激光器组的温度信息；The temperature sensor is used to obtain the temperature information of the main detection laser and the auxiliary laser group;
所述处理装置用于获取所述温度信息，并根据所述温度信息控制所述制冷器的工作状态。The processing device is used to acquire the temperature information, and control the working state of the refrigerator according to the temperature information.
优选的，所述处理装置为单片机或微处理器。Preferably, the processing device is a single-chip microcomputer or a microprocessor.
优选的，所述准直扩束系统包括：Preferably, the collimated beam expander system includes:
设置于所述主检测激光器与所述出射面之间的扩束镜；a beam expander arranged between the main detection laser and the exit surface;
设置于所述扩束镜远离所述主检测激光器一侧的针孔；A pinhole arranged on the side of the beam expander away from the main detection laser;
设置于所述针孔远离所述扩束镜一侧的准直镜；a collimating mirror arranged on the side of the pinhole away from the beam expander;
设置于所述准直镜远离所述针孔一侧的光阑。The diaphragm is arranged on the side of the collimating mirror away from the pinhole.
优选的，所述辅助激光器组包括四个辅助检测激光器，所述四个辅助检测激光器均匀分布于所述傅里叶透镜四周。Preferably, the auxiliary laser group includes four auxiliary detection lasers, and the four auxiliary detection lasers are uniformly distributed around the Fourier lens.
优选的，所述辅助检测激光器为蓝光激光器或红光激光器或绿光激光器。Preferably, the auxiliary detection laser is a blue laser or a red laser or a green laser.
优选的，所述主检测激光器为红光激光器。Preferably, the main detection laser is a red laser.
一种气体检测系统，用于检测待测气体，所述系统包括：至少一个如上述任一实施例所述的多点协同激光模组、气体样品室、探测装置和处理系统；其中，A gas detection system for detecting a gas to be tested, the system comprising: at least one multi-point cooperative laser module as described in any of the above embodiments, a gas sample chamber, a detection device and a processing system; wherein,
所述气体样品室用于存储待测样品；The gas sample chamber is used to store samples to be tested;
所述多点协同激光模组用于向所述气体样品室发送主检测激光和至少四束辅助检测激光，所述主检测激光以正入射方式进入所述气体样品室，所述至少四束辅助检测激光以不同角度入射所述气体样品室；The multi-point cooperative laser module is used to send the main detection laser and at least four auxiliary detection lasers to the gas sample chamber, the main detection laser enters the gas sample chamber with normal incidence, and the at least four auxiliary detection lasers The detection laser is incident on the gas sample chamber at different angles;
所述探测装置用于探测通过所述气体样品室出射的携带有待测样品信息的主检测激光和至少四束辅助检测激光，并将其传送给所述处理系统；The detection device is used to detect the main detection laser and at least four auxiliary detection lasers emitted through the gas sample chamber and carry the information of the sample to be tested, and transmit them to the processing system;
所述处理系统用于根据所述携带有待测样品信息的主检测激光和至少四束辅助检测激光获取所述气体样品室中待测样品的待测样品信息。The processing system is used to obtain the information of the sample to be tested in the gas sample chamber according to the main detection laser carrying the information of the sample to be tested and at least four auxiliary detection lasers.
优选的，所述探测装置包括主光电探测器和辅助探测器；其中，Preferably, the detection device includes a main photodetector and an auxiliary detector; wherein,
所述主光电探测器用于探测通过所述气体样品室出射的携带有待测样品信息的主检测激光；The main photodetector is used to detect the main detection laser carrying the information of the sample to be tested emitted through the gas sample chamber;
所述辅助探测器用于探测通过所述气体样品室出射的携带有待测样品信息的至少四条辅助检测激光。The auxiliary detectors are used to detect at least four auxiliary detection lasers emitted from the gas sample chamber and carrying the information of the sample to be tested.
从上述技术方案可以看出，本发明实施例提供了一种多点协同激光模组及气体检测系统；其中，所述多点协同激光模组能够以正入射的形式向所述气体样品室发送主检测激光，同时能够以斜入射方式向所述气体样品室发送至少四条辅助检测激光；由于所述至少四束辅助检测激光的入射方向与所述主检测激光的入射方向均不相同，被待测气体散射后被气体样品室全反射的光线所携带的待测样品信息也均不相同，因此在对待测样品进行检测的过程中，通过所述气体样品室出射的主检测激光携带的待测样品信息可以被通过所述气体样品室出射的至少四条辅助检测激光所携带的待测样品信息所弥补，保证了对待测气体信息探测的全面性，从而有效地扩大了粒径检测的下限，进而提升了整个气体检测系统的检测精度以及检测数据的可靠性。It can be seen from the above technical solutions that the embodiment of the present invention provides a multi-point cooperative laser module and a gas detection system; wherein, the multi-point cooperative laser module can send The main detection laser beam can send at least four auxiliary detection laser beams to the gas sample chamber in an oblique incident manner; since the incident directions of the at least four auxiliary detection laser beams are different from the incident directions of the main detection laser beams, they are treated as The information of the sample to be tested carried by the light totally reflected by the gas sample chamber after the gas is scattered is also different. The sample information can be compensated by the information of the sample to be tested carried by at least four auxiliary detection lasers emitted from the gas sample chamber, which ensures the comprehensiveness of the detection of the gas information to be tested, thereby effectively expanding the lower limit of particle size detection, and further The detection accuracy of the entire gas detection system and the reliability of detection data are improved.
并且由于所述封装外壳的一体化封装，使得所述多点协同激光模组具有良好的稳定性。And because of the integrated packaging of the packaging shell, the multi-point cooperative laser module has good stability.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据提供的附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.
图1为本申请的一个实施例提供的一种多点协同激光模组的结构示意图；Fig. 1 is a schematic structural diagram of a multi-point cooperative laser module provided by an embodiment of the present application;
图2为本申请的一个实施例提供的一种控制装置的结构示意图；FIG. 2 is a schematic structural diagram of a control device provided by an embodiment of the present application;
图3为本申请的一个实施例提供的一种准直扩束系统的结构示意图；FIG. 3 is a schematic structural diagram of a collimating beam expander system provided by an embodiment of the present application;
图4为本申请的一个实施例提供的一种辅助激光器组的结构示意图；FIG. 4 is a schematic structural diagram of an auxiliary laser group provided by an embodiment of the present application;
图5为本申请的一个实施例提供的一种气体检测系统的结构示意图。Fig. 5 is a schematic structural diagram of a gas detection system provided by an embodiment of the present application.
具体实施方式detailed description
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
本申请公开了一种多点协同激光模组，应用于基于光散射法的气体检测系统，所述检测系统包括气体样品室；如图1所示，所述多点协同激光模组包括：This application discloses a multi-point cooperative laser module, which is applied to a gas detection system based on light scattering method, and the detection system includes a gas sample chamber; as shown in Figure 1, the multi-point cooperative laser module includes:
封装外壳100，所述封装外壳100包括出射面；A packaging case 100, the packaging case 100 includes an exit surface;
设置于所述封装外壳100内部的主检测激光器200，用于发送主检测激光；The main detection laser 200 arranged inside the packaging shell 100 is used to send the main detection laser;
设置于所述主检测激光器200与所述出射面之间的准直扩束系统300，用于对所述主检测激光进行准直扩束处理；A collimation and beam expansion system 300 arranged between the main detection laser 200 and the exit surface is used to perform collimation and beam expansion processing on the main detection laser;
设置于所述出射面内的傅里叶透镜500，用于对经过准直扩束处理后的主检测激光进行逆向傅里叶变换后获得主检测激光，所述主检测激光以正入射的方式进入所述气体样品室；The Fourier lens 500 arranged in the exit surface is used to inverse Fourier transform the main detection laser light after collimation and beam expansion to obtain the main detection laser light, and the main detection laser light is normal incident access to the gas sample chamber;
设置于所述出射面内的辅助激光器组400，所述辅助激光器组400包括至少四个辅助检测激光器，所述至少四个辅助检测激光器设置于所述傅里叶透镜500四周，用于以斜入射方式向所述气体样品室发送至少四束辅助检测激光；The auxiliary laser group 400 arranged in the exit surface, the auxiliary laser group 400 includes at least four auxiliary detection lasers, and the at least four auxiliary detection lasers are arranged around the Fourier lens 500 for oblique sending at least four auxiliary detection laser beams to the gas sample chamber in an incident mode;
设置于所述封装外壳100内，与所述主检测激光器200及辅助激光器组400连接的控制装置(附图1中未示出)，用于驱动所述主检测激光器200发送主检测激光和用于驱动所述辅助激光器发送至少四束辅助检测激光。The control device (not shown in FIG. 1 ) connected to the main detection laser 200 and the auxiliary laser group 400 arranged in the packaging shell 100 is used to drive the main detection laser 200 to send the main detection laser and use to drive the auxiliary laser to send at least four auxiliary detection laser beams.
需要说明的是，一般来讲基于光散射法的气体检测系统中采用的主检测激光器200一般为能够发射红光激光的红光激光器。但在本申请的其他实施例中，所述主检测激光器200还可以为蓝光激光器或滤光激光器。本申请对此并不做限定，具体视实际情况而定。It should be noted that, generally speaking, the main detection laser 200 used in the gas detection system based on the light scattering method is generally a red laser capable of emitting red laser. However, in other embodiments of the present application, the main detection laser 200 may also be a blue light laser or a filter laser. This application does not limit it, and it depends on the actual situation.
现有技术中的检测光路只有一束单一的主检测激光。本申请在保留所述主检测激光的基础上，增加了至少四束斜入射的辅助检测激光。增加至少四束辅助检测激光的目的是为了扩大气体检测系统的检测下限。在只有主检测激光以正入射的方式射向气体样品室的情况下，被待测样品散射的部分主检测激光的散射光在从气体样品室出射时会发生全反射，这样就只有部分主检测激光的散射光可以被接收到，这些没有被接收到的散射光中包含了待测样品大量的亚微米颗粒信息。而所述至少四束斜入射的辅助检测激光以斜入射的方式对可以进行检测，这样可以弥补没有被接收到的主检测激光的散射光中包含的待测样品大量的亚微米颗粒信息，从而提升了气体检测系统的检测下限，进而提升了整个气体检测系统的检测精度以及检测数据的可靠性。The detection optical path in the prior art has only one single main detection laser. In this application, on the basis of retaining the main detection laser light, at least four auxiliary detection laser beams with oblique incidence are added. The purpose of adding at least four auxiliary detection laser beams is to expand the detection lower limit of the gas detection system. In the case where only the main detection laser is incident on the gas sample chamber at normal incidence, part of the scattered light of the main detection laser scattered by the sample to be measured will undergo total reflection when it exits the gas sample chamber, so that only part of the main detection laser The scattered light of the laser can be received, and the scattered light that has not been received contains a large amount of submicron particle information of the sample to be tested. The at least four obliquely incident auxiliary detection laser beams can be detected in an obliquely incident manner, which can compensate for a large amount of submicron particle information of the sample to be measured that is not received in the scattered light of the main detection laser light, thereby The detection lower limit of the gas detection system is improved, thereby improving the detection accuracy of the entire gas detection system and the reliability of detection data.
还需要说明的是，本申请实施例提供的多点协同激光模组的傅里叶透镜500为逆向傅里叶变换的结构，采取这种结构可以减小所述多点协同激光模组的等效焦距，进而可以在不替换傅里叶透镜500的情况下有效扩大应用所述多点协同激光模组的气体检测系统的检测下限，提高对细小颗粒的分辨力。同时这种光学结构的等效焦距连续可调且散射光的最大接收角不受傅里叶透镜500口径的限制。It should also be noted that the Fourier lens 500 of the multi-point cooperative laser module provided in the embodiment of the present application is an inverse Fourier transform structure, which can reduce the etc. The effective focal length can effectively expand the detection limit of the gas detection system using the multi-point cooperative laser module without replacing the Fourier lens 500, and improve the resolution of fine particles. At the same time, the equivalent focal length of this optical structure is continuously adjustable and the maximum receiving angle of scattered light is not limited by the caliber of the Fourier lens 500 .
在上述实施例的基础上，在本申请的一个实施例中，所述控制装置还用于获取所述主检测激光器200及辅助激光器组400的温度，并将其稳定在预设温度范围内。On the basis of the above embodiments, in an embodiment of the present application, the control device is further configured to obtain the temperatures of the main detection laser 200 and the auxiliary laser group 400 and stabilize them within a preset temperature range.
需要说明的是，将所述主检测激光器200及辅助激光器组400的温度稳定在预设温度范围内的目的是为激光器的激光芯片提供适宜的工作环境，保证所述主检测激光器200和辅助激光器组400的可靠性。It should be noted that the purpose of stabilizing the temperature of the main detection laser 200 and the auxiliary laser group 400 within the preset temperature range is to provide a suitable working environment for the laser chip of the laser and ensure that the main detection laser 200 and the auxiliary laser Group 400 reliability.
还需要说明的是，所述预设温度范围为所述主检测激光器200和辅助激光器组400能够正常工作的温度范围。在本申请的一个实施例中，所述预设温度范围为10℃-50℃，包括端点值。在本申请的一个优选实施例中，所述预设温度范围为20℃-35℃，包括端点值。本申请对此并不做限定，具体视实际情况而定。It should also be noted that the preset temperature range is a temperature range in which the main detection laser 200 and the auxiliary laser group 400 can work normally. In one embodiment of the present application, the preset temperature range is 10° C. to 50° C., endpoint values included. In a preferred embodiment of the present application, the preset temperature range is 20°C-35°C, endpoints included. This application does not limit it, and it depends on the actual situation.
在上述实施例的基础上，在本申请的另一个实施例中，如图2所示，所述控制装置600包括：温度传感器610、处理装置620、制冷器630和驱动电路640；其中，On the basis of the above embodiments, in another embodiment of the present application, as shown in FIG. 2 , the control device 600 includes: a temperature sensor 610, a processing device 620, a refrigerator 630, and a drive circuit 640; wherein,
所述驱动电路640用于驱动所述主检测激光器200发送主检测激光及驱动所述辅助激光器组400发送至少四束辅助检测激光，并保持所述主检测激光及所述至少四束辅助检测激光的波长稳定；The drive circuit 640 is used to drive the main detection laser 200 to send the main detection laser and drive the auxiliary laser group 400 to send at least four auxiliary detection lasers, and keep the main detection laser and the at least four auxiliary detection lasers The wavelength is stable;
所述温度传感器610用于获取所述主检测激光器200及辅助激光器组400的温度信息；The temperature sensor 610 is used to obtain temperature information of the main detection laser 200 and the auxiliary laser group 400;
所述处理装置620用于获取所述温度信息，并根据所述温度信息控制所述制冷器630的工作状态。The processing device 620 is used to obtain the temperature information, and control the working state of the refrigerator 630 according to the temperature information.
需要说明的是，所述驱动电路640通过对输入到所述主检测激光器200和辅助激光器组400的驱动电流的控制，使所述主检测激光及所述至少四束辅助检测激光的波长稳定在整个气体检测系统需要的范围。It should be noted that the driving circuit 640 stabilizes the wavelengths of the main detection laser and the at least four auxiliary detection lasers at The range required for the entire gas detection system.
通过所述温度传感器610对所述主检测激光器200和辅助激光器组400的温度进行实时监控并将温度信息传送给所述处理装置620，所述处理装置620对所述温度信息进行处理后，根据处理结果控制所述制冷器630的工作状态，以将所述主检测激光器200和辅助激光器组400的温度保持在预设温度范围内。The temperature of the main detection laser 200 and the auxiliary laser group 400 is monitored in real time through the temperature sensor 610 and the temperature information is transmitted to the processing device 620. After the processing device 620 processes the temperature information, according to The processing result controls the working state of the refrigerator 630 to keep the temperatures of the main detection laser 200 and the auxiliary laser group 400 within a preset temperature range.
还需要说明的是，在本申请的一个实施例中，所述处理装置620为单片机。但在本申请的其他实施例中，所述处理装置620还可以为微处理器。本申请对所述处理装置620采用的具体器件类型并不做限定，具体视实际情况而定。It should also be noted that, in one embodiment of the present application, the processing device 620 is a single-chip microcomputer. However, in other embodiments of the present application, the processing device 620 may also be a microprocessor. The present application does not limit the specific device type used by the processing device 620 , which depends on the actual situation.
在本申请的另一个实施例中，所述制冷器630为半导体制冷器，但本申请对所述制冷器630的具体种类并不做限定，具体视实际情况而定。In another embodiment of the present application, the refrigerator 630 is a semiconductor refrigerator, but this application does not limit the specific type of the refrigerator 630, which depends on the actual situation.
在上述实施例的基础上，本申请的一个具体实施例提供了一种准直扩束系统300的具体组成结构，如图3所示，包括：On the basis of the above embodiments, a specific embodiment of the present application provides a specific composition structure of a collimator beam expander system 300, as shown in FIG. 3 , including:
设置于所述主检测激光器200与所述出射面之间的扩束镜310；a beam expander 310 disposed between the main detection laser 200 and the exit surface;
设置于所述扩束镜310远离所述主检测激光器200一侧的针孔320；a pinhole 320 disposed on the side of the beam expander 310 away from the main detection laser 200;
设置于所述针孔320远离所述扩束镜310一侧的准直镜330；A collimating mirror 330 disposed on the side of the pinhole 320 away from the beam expander 310;
设置于所述准直镜330远离所述针孔320一侧的光阑340。The diaphragm 340 is disposed on the side of the collimating mirror 330 away from the pinhole 320 .
需要说明的是，所述针孔320放置的位置为所述扩束镜310的后焦点所在位置，所述准直透镜前焦点与所述扩束镜310的后焦点重合。It should be noted that the position of the pinhole 320 is the position of the back focus of the beam expander 310 , and the front focus of the collimator lens coincides with the back focus of the beam expander 310 .
还需要说明的是，设置所述准直扩束系统300的目的是改变主检测光束的直径和减小发散角，同时扩大光斑尺寸，将所述主检测激光器200发送的细光束形式的主检测激光转换为一束光束直径符合要求且光强均匀的准直平行光束。It should also be noted that the purpose of setting the collimator beam expander system 300 is to change the diameter of the main detection beam and reduce the divergence angle, and at the same time expand the size of the spot, so that the main detection beam in the form of a thin beam sent by the main detection laser 200 The laser is converted into a collimated parallel beam with the required beam diameter and uniform light intensity.
空气中的微粒、光学元件表面的灰尘或污渍会导致激光发射散射，并且由于激光具有很强的相干性，这些散射光会与杂散光发生干涉现象，对所述主检测激光造成干扰。因此需要将针孔320设置在扩束镜310的后焦点上滤除杂散光。经过扩束镜310和针孔320后的主检测激光汇聚成一个极小的点，可以被近似为一个点光源并产生球面波。而球面波不适合作为气体样品室的检测光，不符合理想的米氏散射(Mie scattering)模型，因此需要在所述扩束镜310的后焦点处设置一个准直透镜，从而将球面波转换为直径符合要求的平面波，更加接近米氏散射理论的检测模型。所述光阑340的作用是对经过准直透镜的光束进行限制，以获得合适的光斑大小。Particles in the air, dust or stains on the surface of optical components will cause laser emission to scatter, and due to the strong coherence of laser light, these scattered light will interfere with stray light, causing interference to the main detection laser light. Therefore, it is necessary to set the pinhole 320 at the back focus of the beam expander 310 to filter out stray light. After passing through the beam expander 310 and the pinhole 320, the main detection laser converges into a very small point, which can be approximated as a point light source and generate spherical waves. The spherical wave is not suitable as the detection light of the gas sample chamber, and does not conform to the ideal Mie scattering (Mie scattering) model. Therefore, a collimating lens needs to be arranged at the back focus of the beam expander 310, thereby converting the spherical wave It is a plane wave whose diameter meets the requirements, which is closer to the detection model of Mie scattering theory. The function of the diaphragm 340 is to limit the beam passing through the collimating lens to obtain a suitable spot size.
在上述实施例的基础上，在本申请的一个优选实施例中，如图4所示，所述辅助激光器组400包括四个辅助检测激光器，所述四个辅助检测激光器均匀分布于所述傅里叶透镜500四周。On the basis of the above embodiments, in a preferred embodiment of the present application, as shown in FIG. 4 , the auxiliary laser group 400 includes four auxiliary detection lasers, and the four auxiliary detection lasers are uniformly distributed on the Lie lens 500 around.
需要说明的是，在本申请的一个实施例中，所述辅助激光器组400还可以为五个辅助检测激光器或六个辅助检测激光器。本申请对所述辅助激光器组400包括的辅助检测激光器的数量并不做限定，具体视实际情况而定。It should be noted that, in an embodiment of the present application, the auxiliary laser group 400 may also be five auxiliary detection lasers or six auxiliary detection lasers. The present application does not limit the number of auxiliary detection lasers included in the auxiliary laser group 400 , which depends on actual conditions.
在上述任一实施例的基础上，在本申请的一个实施例中，所述辅助检测激光器为蓝光激光器或红光激光器或绿光激光器。本申请对所述辅助检测激光器的具体种类并不做限定，具体视实际情况而定。但在本申请的一个优选实施例中，所述辅助检测激光器为蓝光激光器。On the basis of any of the above embodiments, in one embodiment of the present application, the auxiliary detection laser is a blue laser or a red laser or a green laser. The present application does not limit the specific type of the auxiliary detection laser, which depends on the actual situation. But in a preferred embodiment of the present application, the auxiliary detection laser is a blue laser.
需要说明的是，待测样品中颗粒粒径与入射光线的波长决定了散射光的分布范围。在相同的散射角下，光波长越短，对应的粒径越小。因此用短波长的蓝光激光器作为所述辅助检测激光器可以进一步扩大整个气体检测系统的粒径检测下限。It should be noted that the size of the particles in the sample to be tested and the wavelength of the incident light determine the distribution range of the scattered light. Under the same scattering angle, the shorter the wavelength of light, the smaller the corresponding particle size. Therefore, using a short-wavelength blue laser as the auxiliary detection laser can further expand the lower limit of particle size detection of the entire gas detection system.
可以理解的是，也可以采用发送激光波长更短的紫外激光器作为所述辅助检测激光器。但是由于紫外激光器的造价较高，且紫外激光探测较困难等原因，因此蓝光激光器作为所述辅助检测激光器是在目前技术下较为优选的一种做法。It can be understood that, an ultraviolet laser with a shorter laser wavelength can also be used as the auxiliary detection laser. However, due to the high cost of ultraviolet lasers and the difficulty in detecting ultraviolet lasers, blue lasers are preferred as the auxiliary detection laser in the current technology.
相应的，本申请实施例还提供了一种气体检测系统，用于检测待测气体，如图5所示，所述系统包括：至少一个如上述任一实施例所述的多点协同激光模组A10、气体样品室A20、探测装置A30和处理系统A40；其中，Correspondingly, the embodiment of the present application also provides a gas detection system for detecting the gas to be detected, as shown in Figure 5, the system includes: at least one multi-point cooperative laser mode as described in any of the above-mentioned embodiments Group A10, gas sample chamber A20, detection device A30 and processing system A40; wherein,
所述气体样品室A20用于存储待测样品；The gas sample chamber A20 is used to store samples to be tested;
所述多点协同激光模组A10用于向所述气体样品室A20发送主检测激光和至少四束辅助检测激光，所述主检测激光以正入射方式进入所述气体样品室A20，所述至少四束辅助检测激光以不同角度入射所述气体样品室A20；The multi-point cooperative laser module A10 is used to send the main detection laser and at least four auxiliary detection lasers to the gas sample chamber A20, the main detection laser enters the gas sample chamber A20 in a normal incidence mode, and the at least Four auxiliary detection laser beams are incident on the gas sample chamber A20 at different angles;
所述探测装置A30用于探测通过所述气体样品室A20出射的携带有待测样品信息的主检测激光和至少四束辅助检测激光，并将其传送给所述处理系统A40；The detection device A30 is used to detect the main detection laser and at least four auxiliary detection lasers emitted through the gas sample chamber A20 and carry the information of the sample to be tested, and transmit them to the processing system A40;
所述处理系统A40用于根据所述携带有待测样品信息的主检测激光和至少四束辅助检测激光获取所述气体样品室A20中待测样品的待测样品信息。The processing system A40 is used to obtain the sample information of the sample to be tested in the gas sample chamber A20 according to the main detection laser carrying the information of the sample to be tested and at least four auxiliary detection laser beams.
需要说明的是，所述待测样品信息包括待测样品中颗粒的粒径大小、粒度分布、粒度浓度等信息。It should be noted that the information of the sample to be tested includes information such as particle size, particle size distribution, and particle size concentration of the particles in the sample to be tested.
在上述实施例的基础上，在本申请的一个实施例中，如图5所示，所述探测装置A30包括主光电探测器A32和辅助探测器A31；其中，On the basis of the above embodiments, in one embodiment of the present application, as shown in FIG. 5 , the detection device A30 includes a main photodetector A32 and an auxiliary detector A31; wherein,
所述主光电探测器A32用于探测通过所述气体样品室A20出射的携带有待测样品信息的主检测激光；The main photodetector A32 is used to detect the main detection laser light carrying the information of the sample to be tested emitted through the gas sample chamber A20;
所述辅助探测器A31用于探测通过所述气体样品室A20出射的携带有待测样品信息的至少四条辅助检测激光。The auxiliary detector A31 is used to detect at least four auxiliary detection lasers emitted through the gas sample chamber A20 and carrying the information of the sample to be tested.
需要说明的是，由于所述至少四条辅助检测激光的出射角度范围较大，因此所述辅助探测器A31需要具有大角度探测的功能。It should be noted that, since the at least four auxiliary detection lasers have a relatively large emission angle range, the auxiliary detector A31 needs to have a large-angle detection function.
综上所述，本申请实施例公开了一种多点协同激光模组A10及气体检测系统；其中，所述多点协同激光模组A10能够以正入射的形式向所述气体样品室A20发送主检测激光，同时能够以斜入射方式向所述气体样品室A20发送至少四条辅助检测激光；由于所述至少四束辅助检测激光的入射方向与所述主检测激光的入射方向均不相同，被待测气体散射后被气体样品室A20全反射的光线所携带的待测样品信息也均不相同，因此在对待测样品进行检测的过程中，通过所述气体样品室A20出射的主检测激光携带的待测样品信息可以被通过所述气体样品室A20出射的至少四条辅助检测激光所携带的待测样品信息所弥补，保证了对待测气体信息探测的全面性，从而有效地扩大了粒径检测的下限，进而提升了整个气体检测系统的检测精度以及检测数据的可靠性。To sum up, the embodiment of the present application discloses a multi-point cooperative laser module A10 and a gas detection system; wherein, the multi-point cooperative laser module A10 can send The main detection laser can send at least four auxiliary detection lasers to the gas sample chamber A20 in an oblique incidence manner; since the incident directions of the at least four auxiliary detection lasers are different from the incident directions of the main detection laser, they are The information of the sample to be tested carried by the light totally reflected by the gas sample chamber A20 after the gas to be measured is scattered is also different. The information of the sample to be tested can be supplemented by the information of the sample to be tested carried by at least four auxiliary detection lasers emitted from the gas sample chamber A20, which ensures the comprehensiveness of the information detection of the gas to be tested, thereby effectively expanding the particle size detection. The lower limit of the gas detection system improves the detection accuracy of the entire gas detection system and the reliability of the detection data.
并且由于所述封装外壳100的一体化封装，使得所述多点协同激光模组A10具有良好的稳定性。Moreover, due to the integrated package of the package shell 100 , the multi-point cooperative laser module A10 has good stability.
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
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| CN201610223803.2ACN105891075B (en) | 2016-04-12 | 2016-04-12 | A multi-point collaborative laser module and gas detection system |
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| CN201610223803.2ACN105891075B (en) | 2016-04-12 | 2016-04-12 | A multi-point collaborative laser module and gas detection system |
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| CN201610223803.2AActiveCN105891075B (en) | 2016-04-12 | 2016-04-12 | A multi-point collaborative laser module and gas detection system |
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| CN110967316A (en)* | 2018-09-30 | 2020-04-07 | 深圳市帝迈生物技术有限公司 | Blood analysis equipment and optical detection device thereof |
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