CN111707457A - A kind of automobile headlamp detection device and detection method thereof - Google Patents
A kind of automobile headlamp detection device and detection method thereofDownload PDFInfo
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Abstract
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Translated fromChinese技术领域technical field
本发明涉及汽车灯具检测技术领域，尤其涉及一种汽车前照灯检测装置及其检测方法。The invention relates to the technical field of automobile lamp detection, in particular to an automobile headlamp detection device and a detection method thereof.
背景技术Background technique
机动车前照灯检测一直是机动安全性能检测的一个重要环节，随着机动车技术的高速发展，机动车前照灯检测方法也在改变，从原来的硅光电池技术到后面的COMS摄像图像分析技术，都有它的缺点。目前国家执行的标准中，所采用的标准光源是卤素灯，对氙气灯、LED灯没有标准光源。The detection of motor vehicle headlights has always been an important part of motor safety performance testing. With the rapid development of motor vehicle technology, the detection methods of motor vehicle headlights are also changing, from the original silicon photocell technology to the analysis of CMOS camera images behind Technology has its drawbacks. In the current national standards, the standard light source used is halogen lamps, and there is no standard light source for xenon lamps and LED lamps.
从图1和图2的光谱图就可以看出来，硅光电池对于测量LED灯及氙气灯是不准确的，于是就出现了以CMOS摄像机对光照影像进行拍照，然后通过图像的灰度等级进行光强度的计算。It can be seen from the spectrograms in Figures 1 and 2 that silicon photocells are inaccurate for measuring LED lamps and xenon lamps, so a CMOS camera is used to take pictures of the illumination image, and then the light is measured by the grayscale of the image. Calculation of strength.
下面分析一下CMOS的光谱特性，CMOS摄像机光谱响应特性与量子效率，CMOS摄像机成像器件的光谱响应范園,是由光敏面的材料决定的,其本征硅的光谱响应范围,也同样在400~1100nm纳米之间。Let's analyze the spectral characteristics of CMOS, the spectral response characteristics and quantum efficiency of CMOS cameras, and the spectral response range of CMOS camera imaging devices, which are determined by the material of the photosensitive surface. The spectral response range of its intrinsic silicon is also in the range of 400~ Between 1100nm nanometers.
实际上，CMOS成像器件的光谱性能和量子效率,均取决于它的像敏单元(光电二极管)。而光二极管的光赔响应特性与器件的量子效率,受器件表面光反射、光干涉、光透过表面层的透过率的差异及光电子复合等因素的影响,一般量子效率总低于100%。In fact, the spectral performance and quantum efficiency of a CMOS imaging device depend on its image-sensitive unit (photodiode). The optical response characteristics of photodiodes and the quantum efficiency of the device are affected by the light reflection on the surface of the device, light interference, the difference in transmittance of light passing through the surface layer, and the photoelectron recombination. Generally, the quantum efficiency is always lower than 100%.
此外,由于上述影响会随波长而变,所以量子效率也是随波长的变化而变化的。波长在400nm处的量子效率约为50%:波长大约在700nm达到峰值时的量子效率约为70%;而波长在1000nm处的量子效率仅为8%左右。In addition, since the above effects vary with wavelength, the quantum efficiency also varies with wavelength. The quantum efficiency at a wavelength of 400nm is about 50%: the quantum efficiency at a wavelength of about 700nm peaks at about 70%; and the quantum efficiency at a wavelength of 1000nm is only about 8%.
可见光波长范围是400到700纳米之间，汽车三种灯的光谱特性都是在这个区间的强度比较大，只是卤素灯接近线性关系。LED及氙气灯是非线性跳跃。对于这种非线性，要通过标准光源进行精确标定是很难做到的。The wavelength range of visible light is between 400 and 700 nanometers. The spectral characteristics of the three types of lamps in automobiles are relatively large in intensity in this range, but the halogen lamp is close to a linear relationship. LED and Xenon lamps are non-linear jumps. For this nonlinearity, it is difficult to accurately calibrate with a standard light source.
硅光电池对卤素灯的测量是很准确的，但是汽车的发展，LED灯及氙气灯逐步占领大量的市场，硅光电池测量方法自然遭到淘汰，甚至作为一些低端市场产品，成为了一个摆设。CMOS可以适应LED及氙气灯，虽然无法对LED及氙气灯光强精确测量，作为一个基本的判还是可以满足目前市场需求，不过存在一个缺点就是系统复杂，价格较硅光电池的测量模式要贵很多。一般的修理厂不愿意进行购入，很多时候修汽车灯光的修完就凭经验肉眼观查做出判断。The measurement of halogen lamps by silicon photocells is very accurate, but with the development of automobiles, LED lamps and xenon lamps have gradually occupied a large number of markets, and the measurement method of silicon photocells has naturally been eliminated, and even as some low-end market products, it has become a display. CMOS can adapt to LED and xenon lamps. Although it is impossible to accurately measure the intensity of LED and xenon lamps, it can still meet the current market demand as a basic judgment. However, there is a disadvantage that the system is complex and the price is much more expensive than the measurement mode of silicon photovoltaic cells. The general repair shop is reluctant to purchase, and many times the repair of the car lights is based on experience and visual inspection to make judgments.
发明内容SUMMARY OF THE INVENTION
本发明的目的就在于为了解决上述问题而提供了一种汽车前照灯检测装置及其检测方法，通过辅助通道的测量数据对硅光电池进行补偿从而取代CMOS测量方式大大降低成本。The purpose of the present invention is to provide a vehicle headlamp detection device and its detection method in order to solve the above-mentioned problems. The silicon photocell is compensated by the measurement data of the auxiliary channel to replace the CMOS measurement method and greatly reduce the cost.
本发明解决其技术问题所采用的技术方案是：The technical scheme adopted by the present invention to solve its technical problems is:
一种汽车前照灯检测装置，包括外壳，所述外壳的前端设置有采光室，所述采光室内设置有由硅光电池构成的主采样通道，所述外壳的后端设置有测量电路，所述采光室内还设置有辅助采样通道。An automobile headlamp detection device includes a casing, a lighting chamber is arranged at the front end of the casing, a main sampling channel composed of a silicon photocell is arranged in the lighting chamber, a measuring circuit is arranged at the rear end of the casing, and the Auxiliary sampling channels are also arranged in the lighting chamber.
进一步的，所述辅助采样通道由硒光电池构成。Further, the auxiliary sampling channel is composed of a selenium photocell.
进一步的，所述主采样通道设置有第一滤镜，所述辅助采样通道的前端设置有第二滤镜。Further, the main sampling channel is provided with a first filter, and the front end of the auxiliary sampling channel is provided with a second filter.
进一步的，所述第一滤镜仅通过400nm-600nm波长的光，所述第二滤镜仅通过530nm-570nm波长的光。Further, the first filter only passes light with wavelengths of 400nm-600nm, and the second filter only passes light with wavelengths of 530nm-570nm.
一种汽车前照灯检测方法，采用上述汽车前照灯检测装置，A vehicle headlamp detection method, using the above-mentioned vehicle headlamp detection device,
应用前，设置主采样通道和辅助采样通道的放大倍数，将主采样通道获取的信号进行放大，然后通过AD采集转化成数字量，再通过标准光源对主采样通道进行校准，另外配置一个辅助采样通道，同样将辅助采样通道获取的信号进行放大，然后通过AD采集转化成数字量，再通过标准光源对辅助采样通道进行校准，使得到的主采样通道和辅助采样通道的数字量相等，获得主采样通道和辅助采样通道的放大倍数；Before application, set the magnification of the main sampling channel and auxiliary sampling channel, amplify the signal obtained by the main sampling channel, and then convert it into digital quantity through AD acquisition, then calibrate the main sampling channel through the standard light source, and configure an auxiliary sampling channel. channel, also amplify the signal obtained by the auxiliary sampling channel, and then convert it into a digital quantity through AD acquisition, and then calibrate the auxiliary sampling channel through a standard light source, so that the digital quantities of the main sampling channel and the auxiliary sampling channel are equal, and the main sampling channel and the auxiliary sampling channel are equal. The magnification of sampling channel and auxiliary sampling channel;
设置氙气灯和LED灯的补偿系数，选用照度计，随机选择几个氙气前照灯和LED前照灯，照射到该测量装置和照度计，主采样通道及辅助采样通道的数值与照度计的数据为依据进行差值补偿，通过多组氙气前照灯和LED前照灯的多次补偿，使补偿后的数值接近照度计的数值，获得氙气灯和LED灯的补偿系数，并记录；Set the compensation coefficient of xenon lamp and LED lamp, choose illuminance meter, randomly select several xenon headlamps and LED headlamps, and illuminate the measuring device and illuminance meter. The values of the main sampling channel and auxiliary sampling channel are the same as the illuminance meter. The difference compensation is performed based on the data. Through multiple compensations of multiple groups of xenon headlamps and LED headlamps, the compensated value is close to the value of the illuminometer, and the compensation coefficient of the xenon lamp and the LED lamp is obtained and recorded;
应用时，将汽车前照灯照射到该测量装置，获得汽车前照灯的光强。When applied, the vehicle headlamp is irradiated to the measuring device to obtain the light intensity of the vehicle headlamp.
进一步的，所述辅助采样通道采用硒光电池，在主采样通道的前端设置仅通过400nm-600nm波长的光的滤镜，在辅助采样通道的前端设置仅通过530nm-570nm波长的光的滤镜。Further, the auxiliary sampling channel adopts a selenium photocell, and a filter that only passes light with a wavelength of 400nm-600nm is set at the front end of the main sampling channel, and a filter that only passes light with a wavelength of 530nm-570nm is set at the front end of the auxiliary sampling channel.
本发明的有益效果是：The beneficial effects of the present invention are:
通过采用上述技术方案，本发明的汽车前照灯检测装置通过在硅光电池测量灯光的基础上在安装一个辅助测量传感器，形成辅助通道，通过辅助通道的测量数据对硅光电池进行补偿，能够准确的测量卤素灯、氖灯以及LED灯，从而取代CMOS测量方式大大降低成本。By adopting the above technical solution, the automobile headlamp detection device of the present invention installs an auxiliary measurement sensor on the basis of measuring the light of the silicon photovoltaic cell to form an auxiliary channel, and compensates the silicon photovoltaic cell through the measurement data of the auxiliary channel, which can accurately Measure halogen lamps, neon lamps and LED lamps, thereby greatly reducing the cost of replacing CMOS measurement methods.
附图说明Description of drawings
下面结合附图和实施例对本发明进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
图1是目前常见的三种汽车前照灯的光谱特性曲线图；Figure 1 is the spectral characteristic curve diagram of three common automobile headlamps at present;
图2是硅光电池和硒光电池的光谱特性曲线图；Fig. 2 is the spectral characteristic curve diagram of silicon photovoltaic cell and selenium photovoltaic cell;
图3是本发明的汽车前照灯检测装置的结构示意图；Fig. 3 is the structural representation of the automobile headlamp detection device of the present invention;
图4是本发明的汽车前照灯检测装置的硬件框图；Fig. 4 is the hardware block diagram of the automobile headlamp detection device of the present invention;
图5是本发明的汽车前照灯检测装置的检测电路图。FIG. 5 is a detection circuit diagram of the vehicle headlamp detection device of the present invention.
附图标记：1、外壳；2、采光室；3、主采样通道；4、测量电路；5、辅助采样通道；6、第一滤镜；7、第二滤镜；8、充电电池；9、液晶操作屏。Reference signs: 1. Housing; 2. Lighting room; 3. Main sampling channel; 4. Measuring circuit; 5. Auxiliary sampling channel; 6. First filter; 7. Second filter; 8. Rechargeable battery; 9 , LCD operation screen.
具体实施方式Detailed ways
下面结合附图和具体实施例对本发明作进一步说明，以使本领域技术人员可以更好的理解本发明并能予以实施，但所举实施例不作为对本发明的限定。The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.
如图3-5所示，一种汽车前照灯检测装置，包括外壳1，外壳1的前端设置有采光室2，采光室2内设置有由硅光电池构成的主采样通道3，外壳1的后端设置有测量电路4，采光室2内还设置有辅助采样通道5。As shown in Fig. 3-5, an automobile headlamp detection device includes a
本装置配置一个硅光电池作为主测量单元，可以安装第一滤镜6将波长在400nm到600nm以外的全部滤除掉，保留可见光范围，以及再本装置再配置一个安装第二滤镜7确保550nm峰值的光谱可以通过的硒光电池或光学玻璃作为辅助单元。The device is equipped with a silicon photocell as the main measurement unit, and a
硅光电池作为主采样通道3，安装滤镜将波长在400nm到600nm以外的全部滤除掉以后，将信号进行放大，然后通过AD采集转化成数字量，通过标准光源进行校准，由于标准光源目前都是卤素灯，硅光电池在这个波长范围具有很好的线性。通过校准后的仪器完全可以准确测量所有卤素灯光。The silicon photocell is used as the
系统另外配置一个硒光电池或确保550nm峰值的光谱可以通过的光学玻璃作为辅助采样通道5，我们同样进行信号放大，对模拟信号进行AD转换变成数字量，通过标准光源对辅助采样通道5进行校准。较准好后，我们下一步就是对氙气灯、LED灯进行补偿系数的设置。因为如果被测量灯属于卤素灯的话，辅助采样通道5与主采样通道3数值应该是接近的。但是如果是氙气灯与LED灯的话，辅助采样通道5是特意放大了550nm峰值的光谱，跟据汽车灯光特性，550nm是氙气灯及LED灯亮度最高的地方。所以辅助采样通道5的数字应该大于主采样通道3的数值。氙气大灯与LED大灯目前没有标准灯，我们可以选用照度计，通过随机选择几个氙气大灯，照射到测量装置，主采样通道3及辅助采样通道5采集的数值与照度计的数据为依据进行差值补偿。补偿后的数值就应该接近照度计的数值，通过多组氙气大灯及LED灯的多次补偿，基本上可以更加精确测量汽车的氙气大灯及LED大灯了。The system is additionally equipped with a selenium photocell or optical glass that ensures that the 550nm peak spectrum can pass through as the
两个采样信号分别通过信号放大器进行放大，因为光电池的短路电流是最线性的，我们必须将光电池的负载电阻取很小值。然后获得的mv信号进行放大。放大后的信号经过AD采集变成数字量。由于两个采样通道通过了不同光谱的滤镜，主采样通道3过滤光源少，放大倍数应该小一些。辅助采样通道5过滤的光源多，通过的光谱范围小，放大倍数需要大一些才能确保两个通道显示一样的值。The two sampling signals are amplified by signal amplifiers, because the short-circuit current of the photovoltaic cell is the most linear, we must set the load resistance of the photovoltaic cell to a small value. The obtained mv signal is then amplified. The amplified signal is converted into a digital quantity through AD acquisition. Since the two sampling channels have passed filters with different spectra, the
测量电路4得到两组传感器采集到的数字量信号，我们得通过标准光源对这组数字量与光强对应起来。这个过程叫做标定，由于标准光源都是卤素灯。我们可以将主采样通道3及辅助采样通道5都标定好。标定得时候要确保采样头与光源的距离固定，这里我们可以设定为1米。标定好后，对应卤素灯得检测，应该都是正确的了。The
对应氙气灯与LED灯，我们需要用到标准照度计，由于目前标准光源没有氙气灯与LED灯，我们就以标准照度计作为参考。跟据“光强＝照度×距离的平方”这样一个换算方法，我们的仪器配备一个1米的可伸缩导杆，通过这个可伸缩导杆，确保采样传感器与光源距离是1米。这个时候我们选择不同的氙气光源照射到两个采样光电池上，所显示的数值必然不同。主采样通道3的放大倍数没有辅助采样通道5的放大倍数大，这是对应光谱范围小的氙气灯，就会表现出辅助采样通道5大于主采样通道3数值。然后我们利用照度计换算出这个光源的真实光强度。跟进主副通道的差值，及被真实光强度，进行插值算法。确保不同的氙气灯都能够正确测量。同样LED灯也是采用一样的方法。Corresponding to xenon lamps and LED lamps, we need to use a standard illuminance meter. Since the current standard light source does not have xenon lamps and LED lamps, we use the standard illuminance meter as a reference. According to the conversion method of "light intensity = illuminance × distance squared", our instrument is equipped with a 1-meter retractable guide rod. Through this retractable guide rod, the distance between the sampling sensor and the light source is guaranteed to be 1 meter. At this time, we choose different xenon light sources to illuminate the two sampling photocells, and the displayed values must be different. The magnification of the
并且，该汽车前照灯检测装置设计为便携式，本装置配备一组可充电电池8，作为电池管理系统。系统采样图形化液晶显示，在外壳1的表面增加液晶操作屏9，可以方便进行人性化指示操作。本装置还配备了串口通讯、蓝牙通讯装置，方便联网。Moreover, the vehicle headlamp detection device is designed to be portable, and the device is equipped with a set of
本发明的上述实施例并不是对本发明保护范围的限定，本发明的实施方式不限于此，凡此种种根据本发明的上述内容，按照本领域的普通技术知识和惯用手段，在不脱离本发明上述基本技术思想前提下，对本发明上述结构做出的其它多种形式的修改、替换或变更，均应落在本发明的保护范围之内。The above-mentioned embodiments of the present invention are not intended to limit the scope of protection of the present invention, and the embodiments of the present invention are not limited thereto. According to the above-mentioned contents of the present invention, according to common technical knowledge and conventional means in the field, without departing from the present invention Under the premise of the above basic technical idea, other various modifications, replacements or changes made to the above structure of the present invention should all fall within the protection scope of the present invention.
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