技术领域technical field
本发明属于光纤传感测量技术领域，它涉及传感器网络化系统。The invention belongs to the technical field of optical fiber sensing and measurement, and relates to a sensor network system.
背景技术Background technique
光腔衰荡(ringdown)技术在20世纪80年代被提出后，就被人们广泛的研究和使用，特别是在微量变化测量方面的应用。光电子技术和光通信技术的快速发展，促使以光纤为基础的传感器得到更为广泛的应用，于是在2001年，G.Stewart等首次提出光纤环形衰荡腔系统，并将其用于应力、压力和微量气体等方面。After the optical cavity ringdown (ringdown) technology was proposed in the 1980s, it has been widely studied and used, especially in the application of micro-variation measurement. The rapid development of optoelectronic technology and optical communication technology has promoted the wider application of optical fiber-based sensors. Therefore, in 2001, G.Stewart et al. first proposed the optical fiber ring ring-down cavity system and used it for stress, pressure and trace gases etc.
由于光纤传感器具有价格低廉、轻便、耐酸碱、抗腐蚀和抗电磁干扰等优良特性，基于光纤结构的环形腔衰荡(ringdown)传感器因此受到广泛的关注。这种技术也被称为光纤衰荡(ringdown)腔技术，它是利用光纤环形腔内的光损耗与外界的相关物理量变化相关，通过拟合可以得出相应物理量变化信息。Due to the excellent characteristics of optical fiber sensors such as low price, light weight, acid and alkali resistance, corrosion resistance and anti-electromagnetic interference, ring-down sensors based on optical fiber structures have received extensive attention. This technology is also called optical fiber ringdown cavity technology, which uses the optical loss in the optical fiber ring cavity to correlate with the change of related physical quantities outside, and the corresponding physical quantity change information can be obtained through fitting.
这种技术被广泛应用于压力、折射率变化、化学及生物溶液的浓度变化、温度变化等物理量测量上。由于在实际应用中需要多位置物理量测量，而且要求实时性，这样就需要多个光纤衰荡(ringdown)腔传感器同时测量。而目前，每一个光纤衰荡(ringdown)腔传感器需要一个光源及解调光路，在多位置测量时，需要布置多个传感器，因此需要多个光源及解调光路，成本高且资源的大量浪费。This technique is widely used in the measurement of physical quantities such as pressure, refractive index changes, concentration changes of chemical and biological solutions, and temperature changes. Since multi-position physical quantity measurement is required in practical applications, and real-time performance is required, multiple optical fiber ringdown cavity sensors are required to be measured simultaneously. At present, each optical fiber ringdown cavity sensor requires a light source and a demodulation optical path. When measuring at multiple locations, multiple sensors need to be arranged, so multiple light sources and demodulation optical paths are required, which leads to high cost and a large waste of resources. .
发明内容Contents of the invention
本发明的目的是为了解决现有实时多位置同时测量中需每一个光纤衰荡腔传感器对应需要一个光源及解调光路所产生的成本高和资源浪费的问题，提供一种基于波分复用的光纤衰荡腔传感阵列装置。The purpose of the present invention is to solve the problem of high cost and resource waste caused by the need for each optical fiber ring-down cavity sensor corresponding to a light source and demodulation optical path in the existing real-time multi-position simultaneous measurement, and to provide a wavelength division multiplexing based Optical fiber ring down cavity sensing array device.
基于波分复用的光纤衰荡腔传感阵列装置，它包括可调谐激光器、声光调制器、隔离器、光电探测器、检测单元、M个光纤衰荡腔传感器和M个光纤光栅，M为大于1的整数，可调谐激光器、声光调制器和隔离器依次串接在光路中，光纤衰荡腔传感器包括输入耦合器、光纤和输出耦合器，输入耦合器与输出耦合器之间利用光纤连接成为一个环形闭合腔结构，一个光纤衰荡腔传感器的输入耦合器对应与一个光纤光栅通过光纤串接组成一组，M组光纤衰荡腔传感器的输入耦合器和光纤光栅通过光纤依次串接在一路光路中，隔离器的输出端与所述光路的输入端连通；M个光纤衰荡腔传感器的输出耦合器通过光纤依次串接在输出光路中，输出光路中光信号由光电探测器接收，光电探测器的检测信号的输出端与检测单元的检测信号的输入端连通，光电探测器的输出端为传感信号的输出端。Optical fiber ring-down cavity sensor array device based on wavelength division multiplexing, which includes a tunable laser, an acousto-optic modulator, an isolator, a photodetector, a detection unit, M fiber ring-down cavity sensors and M fiber gratings, M is an integer greater than 1, the tunable laser, the acousto-optic modulator and the isolator are sequentially connected in series in the optical path, the optical fiber ring-down cavity sensor includes an input coupler, an optical fiber and an output coupler, between the input coupler and the output coupler The optical fiber is connected to form a ring-shaped closed cavity structure. The input coupler of a fiber ring down cavity sensor corresponds to a fiber grating connected in series through an optical fiber to form a group. Connected in one optical path, the output end of the isolator is connected with the input end of the optical path; the output couplers of M optical fiber ring-down cavity sensors are sequentially connected in series in the output optical path through optical fibers, and the optical signal in the output optical path is detected by the photodetector For receiving, the output end of the detection signal of the photodetector is connected with the input end of the detection signal of the detection unit, and the output end of the photodetector is the output end of the sensing signal.
本发明通过一个光源及解调光路实现了同时获取M个光纤衰荡腔传感器传感信号，实现了M个衰荡腔传感探头复用。解决了现有单个光纤衰荡腔传感器的无法同时获知多个位置的同时监测、实时测量以及多个光纤衰荡腔传感器需要多个光源及解调光路的问题。降低了应用传感器阵列的成本，使衰荡腔传感技术的应用更加经济实用。The invention realizes simultaneous acquisition of sensing signals of M optical fiber ring-down cavity sensors through one light source and demodulation optical path, and realizes multiplexing of M ring-down cavity sensor probes. The invention solves the problems that the existing single optical fiber ring-down cavity sensor cannot simultaneously obtain the simultaneous monitoring and real-time measurement of multiple positions, and the problems that multiple optical fiber ring-down cavity sensors require multiple light sources and demodulation optical paths. The cost of applying the sensor array is reduced, and the application of the ring-down cavity sensing technology is more economical and practical.
附图说明Description of drawings
图1为具体实施方式一中本发明的结构示意图，图2为具体实施方式二中可调谐激光器的组成结构示意图，图3为具体实施方式三中单个光纤环形腔的衰荡曲线，图4为具体实施方式四中无外界环境变化时衰荡曲线波形，图5为具体实施方式五中有应力施加时的衰荡曲线波形。Fig. 1 is a schematic structural diagram of the present invention in the first embodiment, Fig. 2 is a schematic diagram of the composition structure of the tunable laser in the second embodiment, Fig. 3 is a ring-down curve of a single fiber ring cavity in the third embodiment, Fig. 4 is The waveform of the ring-down curve in Embodiment 4 when there is no change in the external environment, and FIG. 5 is the waveform of the ring-down curve in Embodiment 5 when stress is applied.
具体实施方式Detailed ways
具体实施方式一：结合图1说明本实施方式，本实施方式所述基于波分复用的光纤衰荡腔传感阵列装置，它包括可调谐激光器1、声光调制器2、隔离器3、光电探测器4、检测单元7、M个光纤衰荡腔传感器5和M个光纤光栅6，M为大于1的整数，可调谐激光器1、声光调制器2和隔离器3依次串接在光路中，光纤衰荡腔传感器5包括输入耦合器5-1、光纤5-2和输出耦合器5-3，输入耦合器5-1与输出耦合器5-3之间利用光纤5-2连接成为一个环形闭合腔结构，一个光纤衰荡腔传感器5的输入耦合器5-1对应与一个光纤光栅6通过光纤串接组成一组，光纤光栅6反射回来的信号光作为衰荡腔传感器的衰荡信号。M组光纤衰荡腔传感器5的输入耦合器5-1和光纤光栅6通过光纤依次串接在一路光路中，隔离器3的输出端与所述光路的输入端连通；M个光纤衰荡腔传感器5的输出耦合器5-3通过光纤依次串接在输出光路中，输出光路中光信号由光电探测器4接收，光电探测器4的检测信号的输出端与检测单元7的检测信号的输入端连通，光电探测器4的输出端为传感信号的输出端。Specific Embodiment 1: This embodiment is described in conjunction with FIG. 1. The optical fiber ring-down cavity sensor array device based on wavelength division multiplexing described in this embodiment includes a tunable laser 1, an acousto-optic modulator 2, an isolator 3, Photodetector 4, detection unit 7, M fiber ring down cavity sensors 5 and M fiber gratings 6, M is an integer greater than 1, tunable laser 1, acousto-optic modulator 2 and isolator 3 are sequentially connected in the optical path Among them, the optical fiber ring down cavity sensor 5 includes an input coupler 5-1, an optical fiber 5-2 and an output coupler 5-3, and the input coupler 5-1 and the output coupler 5-3 are connected by an optical fiber 5-2 to form A ring closed cavity structure, the input coupler 5-1 of an optical fiber ring-down cavity sensor 5 corresponds to a fiber grating 6 connected in series through optical fibers to form a group, and the signal light reflected by the fiber grating 6 is used as the ring-down of the ring-down cavity sensor Signal. The input coupler 5-1 and the fiber grating 6 of the M group of optical fiber ring down cavity sensors 5 are sequentially connected in series in one optical path through an optical fiber, and the output end of the isolator 3 is communicated with the input end of the optical path; M optical fiber ring down cavity The output coupler 5-3 of the sensor 5 is sequentially connected in series in the output optical path through an optical fiber, and the optical signal in the output optical path is received by the photodetector 4, and the output terminal of the detection signal of the photodetector 4 is connected with the input of the detection signal of the detection unit 7 The terminals are connected, and the output terminal of the photodetector 4 is the output terminal of the sensing signal.
本发明利用将M个光纤环形腔连接起来，并利用光纤光栅进行选波，然后输入到相应的衰荡腔中，保证了每个光纤衰荡腔中的光为单一波长。The present invention connects M optical fiber ring cavities, uses optical fiber gratings to select waves, and then inputs them into corresponding ring-down cavities, thereby ensuring that the light in each optical fiber ring-down cavity has a single wavelength.
一个可调谐的光源产生波长连续可变的激光，这束激光通过声光调制器调制成脉冲(得到较高的消光比)，然后经由光隔离器进入2*2的分光比为99：1的耦合器，光在第一个输入耦合器的输入端输入后，从第一个输入耦合器的99%端耦合出去。第一个输入耦合器的99%输出端加上第一个布拉格光纤光栅。A tunable light source produces laser with continuously variable wavelength. This laser beam is modulated into pulses by an acousto-optic modulator (to obtain a higher extinction ratio), and then enters a 2*2 beam splitting ratio of 99:1 through an optical isolator. Coupler, after the light is input at the input end of the first input coupler, it is coupled out from the 99% end of the first input coupler. The 99% output of the first input coupler is coupled with the first Fiber Bragg Grating.
t1时刻，可调谐激光器输出的激光正好与第一个光纤光栅的波长温和，特定波长的光反射回两个99：1耦合器形成的光纤环形腔中。光在光纤环形腔中在运行到2*2的99：1的输出耦合器时，有1%的光耦合出去，耦合出去的光被探测器接收转换为电信号。这时光纤环形腔中剩下的大部分光继续在光纤环形腔中传播，同时强度发生衰减，光传输一圈后又回到输出耦合器上，再次输出1%的光，光在光纤环形腔中形成衰荡。如此反复，从t1时刻开始，形成多个指数衰减的电脉冲串。当有物理量加载到衰荡腔中，使光纤的衰荡时间产生变化。将电信号输入到解调装置根据衰荡时间的变化，可以测得物理量变化信息。At time t1, the laser output from the tunable laser coincides with the wavelength of the first fiber grating, and the light of a specific wavelength is reflected back into the fiber ring cavity formed by two 99:1 couplers. When the light travels to the 2*2 99:1 output coupler in the fiber ring cavity, 1% of the light is coupled out, and the coupled light is received by the detector and converted into an electrical signal. At this time, most of the remaining light in the fiber ring cavity continues to propagate in the fiber ring cavity, and the intensity attenuates at the same time. After the light travels a circle, it returns to the output coupler and outputs 1% of the light again. In the formation of downs and downs. Repeatedly, starting from time t1, multiple exponentially decaying electric pulse trains are formed. When a physical quantity is loaded into the ring-down cavity, the ring-down time of the optical fiber is changed. Inputting the electrical signal to the demodulation device can measure the change information of the physical quantity according to the change of the ring-down time.
t2时刻，激光器输出的光与第二个光纤光栅吻合，这个信号光将陆续经过第一个输入耦合器，第一个光纤光栅。经过第二个输入耦合器，进入第二个光纤光栅。由于波长正好等于第二个光纤光栅的反射波长，因此这个信号光将发生反射，进入第二个衰荡腔。光的运行过程与第一级相同，光在第二级光纤环形腔中发生衰减，并每在光纤环形腔中传输一圈就输出一次光强，如此反复，形成第二级衰荡串。同样通过解调装置读出相应的光强变化量，得出第二级的衰荡衰减时间，确定第二个衰荡腔的物理量变化。At time t2, the light output from the laser coincides with the second fiber grating, and this signal light will pass through the first input coupler and the first fiber grating successively. After the second input coupler, it enters the second fiber grating. Since the wavelength is exactly equal to the reflection wavelength of the second fiber grating, this signal light will be reflected and enter the second ring-down cavity. The operation process of the light is the same as that of the first stage. The light is attenuated in the second-stage fiber ring cavity, and the light intensity is output every time it is transmitted in the fiber ring cavity, and so on, forming the second-stage ring-down string. Also read out the corresponding light intensity variation through the demodulation device to obtain the second-stage ring-down decay time and determine the physical quantity change of the second ring-down cavity.
第M级光纤环形腔的运行方式与上述前两级相一致的。利用可调激光器进行周期扫波，就可以的到周期性输出。由于每个光纤环形腔的波长不同，因此可以轻易区分出ringdown时间的变化来自于哪一个光纤环形腔，即可以确定来自于哪个位置的传感器信息。The operation mode of the Mth grade optical fiber ring cavity is consistent with the above-mentioned first two grades. Periodic output can be obtained by using the tunable laser for periodic sweeping. Since the wavelength of each optical fiber ring cavity is different, it can be easily distinguished which fiber ring cavity the change in ringdown time comes from, that is, the sensor information from which position can be determined.
由于可调谐激光器的波长是连续可调的，通过合理设置两个光栅的波长间距和可调谐激光器的波长随时间的变化率，我们可以通过M个衰荡腔的不同衰荡谱的时序差别来区别不同波长的衰荡腔传感器的传感信息。Since the wavelength of the tunable laser is continuously adjustable, by reasonably setting the wavelength spacing of the two gratings and the time-varying rate of the wavelength of the tunable laser, we can use the timing difference of different ring-down spectra of M ring-down cavities to determine Sensing information of ring-down cavity sensors with different wavelengths is distinguished.
利用该项技术或原理的传感器均应属于其权利要求的范围。Sensors using this technology or principle should fall within the scope of the claims.
具体实施方式二：结合图2说明本实施方式，本实施方式是对具体实施方式一所述基于波分复用的光纤衰荡腔传感阵列装置的可调谐激光器1。可使用如下结构，它包括波分复用器1-1、80:20耦合器1-2、隔离器1-3、掺饵光纤1-4、F-P滤波器1-5和半导体激光器1-6，波分复用器1-1、掺饵光纤1-4、隔离器1-3、F-P滤波器1-5和80:20耦合器1-2通过光纤依次串接在闭环光路中，半导体激光器1-6的光输出端与波分复用器1-1的光输入端连通，80:20耦合器1-2的20%信号输出端为可调谐激光器1的输出端。Embodiment 2: This embodiment is described with reference to FIG. 2 . This embodiment is for the tunable laser 1 of the optical fiber ring-down cavity sensor array device based on wavelength division multiplexing described in Embodiment 1. The following structure can be used, which includes wavelength division multiplexer 1-1, 80:20 coupler 1-2, isolator 1-3, erbium-doped fiber 1-4, F-P filter 1-5 and semiconductor laser 1-6 , wavelength division multiplexer 1-1, erbium-doped optical fiber 1-4, isolator 1-3, F-P filter 1-5 and 80:20 coupler 1-2 are sequentially connected in series in the closed-loop optical path through the optical fiber, and the semiconductor laser The optical output end of 1-6 is connected with the optical input end of wavelength division multiplexer 1-1, and the 20% signal output end of 80:20 coupler 1-2 is the output end of tunable laser 1.
可调谐激光器1，在波分复用式ringdown腔传感器中，提供一个扫波的作用，也就是在声光调制器2输出一个脉冲的时候，可以完成一个周期的扫波，做M个光纤环的复用，需要在这段时间内能输出覆盖M个波长的连续激光，而其中提供可变波长的是F-P滤波器1-5，由于这种滤波器的透过波长和控制电压满足线性关系，可以利用连续调节电压将需要的光波长利用F-P滤波器1-5连续调谐输出。The tunable laser 1 provides a sweeping function in the wavelength division multiplexing ringdown cavity sensor, that is, when the acousto-optic modulator 2 outputs a pulse, it can complete a cycle of sweeping and make M optical fiber rings The multiplexing needs to be able to output continuous laser light covering M wavelengths during this period, and the variable wavelength is provided by F-P filter 1-5, because the transmission wavelength and control voltage of this filter satisfy a linear relationship , the required optical wavelength can be continuously tuned and output by the F-P filter 1-5 by continuously adjusting the voltage.
由980nm的光源1-6进行泵浦，利用掺饵光纤产生1550nm的宽带激光，使用F-P滤波器选择性透过需要的波长，实现可调谐光源设计。Pumped by 980nm light sources 1-6, erbium-doped fiber is used to generate 1550nm broadband laser, and F-P filter is used to selectively transmit the required wavelength to realize the design of tunable light source.
本方案利用自主设计的可调谐激光器实现波长控制，但不限制于这种可调谐光源类型，满足可以实现光纤传感器复用条件的连续可调谐光源均可。This solution uses a self-designed tunable laser to achieve wavelength control, but it is not limited to this type of tunable light source, and a continuously tunable light source that meets the conditions for multiplexing optical fiber sensors can be used.
具体实施方式三：利用光纤衰荡环的原理，我们设计的四个衰荡腔复用传感阵列结构。选择光纤衰荡腔长为60m时，ringdown时间满足这样的公式：其中光纤环形腔一圈的损耗应满足：A=αL+E+γ，考虑到散射损耗一般情况很小，散射损耗γ=0，也就是会有这样公式：A=αL+E，其中L=60m，同时α=0.34dB/km，耦合器的插入损耗假定一为0.09dB，光纤连接点损耗0.02dB，最后得出：E=2×0.09+3×0.02dB=0.24dB。这样得出=0.0599，(4.343的引入是将dB转换为1为单位的数据过程量dB=10/ln10)。即：中得出t0=4.88μs。其中常用单模光纤折射率n=1.464。同时会得出光在光纤中传输一圈的时间：图3给出了单个衰荡腔的衰荡图。Specific implementation mode three: Utilizing the principle of the optical fiber ring-down ring, we design four ring-down cavities to multiplex the sensing array structure. When the fiber ringdown cavity length is selected as 60m, the ringdown time satisfies the following formula: Among them, the loss of one circle of the optical fiber ring cavity should satisfy: A=αL+E+γ, considering that the scattering loss is generally very small, and the scattering loss γ=0, that is to say, there will be such a formula: A=αL+E, where L= 60m, at the same time α=0.34dB/km, the insertion loss of the coupler is assumed to be 0.09dB, the loss of the fiber connection point is 0.02dB, and finally: E=2×0.09+3×0.02dB=0.24dB. so that =0.0599, (the introduction of 4.343 is to convert dB into a unit of data process dB=10/ln10). Right now: Obtained in t0 =4.88μs. Among them, the refractive index of single-mode fiber is n=1.464. At the same time, the time for light to travel a circle in the fiber will be obtained: Figure 3 shows the ring-down diagram of a single ring-down cavity.
我们制作4个衰荡腔，选取光纤光栅波长1530nm，1535nm，1540nm，1545nm，对应的每个衰荡环衰荡时间是4.88μs。因此需要的是F-P滤波器1530-1545nm的连续调谐扫描周期大于20μs。既F-P滤波器调制周期要覆盖4个衰荡腔的ringdown时间。图4给出了四个光纤衰荡腔传感器复用的衰荡图。We make 4 ring-down cavities, select fiber grating wavelengths of 1530nm, 1535nm, 1540nm, and 1545nm, and the corresponding ring-down time of each ring-down ring is 4.88μs. What is therefore required is a continuous tuning scan period of the F-P filter 1530-1545 nm greater than 20 μs. That is, the F-P filter modulation period should cover the ringdown time of 4 ringdown cavities. Figure 4 shows the multiplexed ring-down diagram of four optical fiber ring-down cavity sensors.
具体实施方式四：结合图1和图3说明本实施方式，本实施方式是对具体实施方式一所述基于波分复用的光纤衰荡腔传感阵列装置的进一步限定，声光调制器2采用AMM-55-8-70-1550-2FP。Embodiment 4: This embodiment is described in conjunction with FIG. 1 and FIG. 3. This embodiment is a further limitation of the optical fiber ring-down cavity sensing array device based on wavelength division multiplexing described in Embodiment 1. The acousto-optic modulator 2 Use AMM-55-8-70-1550-2FP.
该声光调制器仅作为例证，其他任意满足使用条件的声光调制器均可。The acousto-optic modulator is only an example, and any other acousto-optic modulator that satisfies the conditions of use can be used.
声光调制器的型号是BRIMROSE的AMM-55-8-70-1550-2FP，S/N：0611-SY-7400。同时使用BRIMROSE的ACOUSTO-OPTICDRIVER作为驱动，信号控制使用的是Tektronix的AFG320。通过计算可知道，若想实现M个复用或者更多，信号源周期必须满足大于M倍的ringdown时间，声光调制器信号源频率为30KHz，将占空比设置为1%。将信号幅值设定为3V，offset设置为1.5V。The model of the acousto-optic modulator is AMM-55-8-70-1550-2FP of BRIMROSE, S/N: 0611-SY-7400. At the same time, ACOUSTO-OPTICDRIVER of BRIMROSE is used as the driver, and AFG320 of Tektronix is used for signal control. Through calculation, we can know that if we want to achieve M multiplexing or more, the signal source cycle must meet the ringdown time greater than M times, the signal source frequency of the acousto-optic modulator is 30KHz, and the duty cycle is set to 1%. Set the signal amplitude to 3V and the offset to 1.5V.
具体实施方式五：结合图1说明本实施方式，本实施方式是对具体实施方式一所述基于波分复用的光纤衰荡腔传感阵列装置的进一步限定，光纤光栅6采用布拉格光纤光栅。Embodiment 5: This embodiment is described with reference to FIG. 1 . This embodiment is a further limitation of the fiber ring-down cavity sensor array device based on wavelength division multiplexing described in Embodiment 1. The fiber grating 6 adopts a fiber Bragg grating.
具体实施方式六：结合图1、图4和图5说明本实施方式，本实施方式是对具体实施方式一所述基于波分复用的光纤衰荡腔传感阵列装置的进一步限定，光电探测器4采用LowNoisePhotoreceiver型号为DC-125MHZ的探测器。Specific embodiment six: This embodiment is described in conjunction with Fig. 1, Fig. 4 and Fig. 5. This embodiment is a further limitation of the optical fiber ring-down cavity sensor array device based on wavelength division multiplexing described in specific embodiment one, and the photoelectric detection Device 4 adopts the detector of LowNoisePhotoreceiver model as DC-125MHZ.
该光电探测器仅作为例证，其他任意满足使用条件的光电探测器均可。This photodetector is only an example, and any other photodetectors that meet the conditions of use can be used.
传感器的主要部分是光纤环形腔，设定环形腔长度为L=60m，使用的是99：1的耦合器和光纤，构成光纤ringdown腔。The main part of the sensor is the optical fiber ring cavity. The length of the ring cavity is set to L=60m, and a 99:1 coupler and optical fiber are used to form an optical fiber ringdown cavity.
实现光电转换功能的光探测器是LowNoisePhotoreceiver(DC-125MHZ)，使用0901形Current-LimitedPowerSupply为其提供电源。这样就将电信号转换为光信号，然后可以利用示波器进行分析。The photodetector that realizes the photoelectric conversion function is LowNoisePhotoreceiver (DC-125MHZ), and uses 0901-shaped Current-LimitedPowerSupply to provide power for it. This converts the electrical signal into an optical signal, which can then be analyzed with an oscilloscope.
应力施加在光纤环形腔上，输出光强度波形发生的变化。由于每个光纤环感知的是不同位置的应力变化，各自衰荡时间的改变是不同的，例如，图5中第四个光纤环的ringdown时间和图4中对应的未加应力的ringdown时间对比，ringdown时间变为2μs。通过线性拟合，得出衰荡时间和外界压力的关系参量k的数值。Stress is applied to the optical fiber ring cavity, and the output light intensity waveform changes. Since each optical fiber ring senses stress changes at different locations, the change of ringdown time is different. For example, the ringdown time of the fourth optical fiber ring in Figure 5 is compared with the corresponding unstressed ringdown time in Figure 4 , the ringdown time becomes 2μs. Through linear fitting, the value of the relationship parameter k between the ring-down time and the external pressure is obtained.
当然，这种复用技术不止适用于应力测量，如果可以使光纤环形腔对温度敏感，这种传感器也可以做成温度检测仪。由于该传感器可实现对不同物理量敏感，因此这种传感器，可以凭借其多位置物理量测定能力，实时监测能力强等优良特性得到广泛的使用。Of course, this multiplexing technology is not only suitable for stress measurement, if the fiber ring cavity can be made temperature sensitive, this sensor can also be made into a temperature detector. Because the sensor can be sensitive to different physical quantities, this sensor can be widely used by virtue of its multi-position physical quantity measurement capability and strong real-time monitoring capability.
解决了现有单个光纤ringdown腔传感器的无法同时获知多个位置物理量的能力，不使用大量延时光纤，就可实现更多传感探头复用，提高资源利用率，并且使用光纤作为材料，便于成网铺设，对安放环境条件要求低，具有更高的实用性。由于以上的优点这种波分复用式ringdown腔传感器阵列在实际工程应用中会有更广泛的前景，是未来理想的结构监测传感器阵列。It solves the problem that the existing single optical fiber ringdown cavity sensor cannot obtain the physical quantity of multiple positions at the same time. Without using a large number of time-delayed optical fibers, it can realize the multiplexing of more sensing probes, improve resource utilization, and use optical fibers as materials, which is convenient Laying in nets has low requirements on the installation environment and has higher practicability. Due to the above advantages, this wavelength division multiplexed ringdown cavity sensor array will have wider prospects in practical engineering applications, and it will be an ideal structure monitoring sensor array in the future.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310320406.3ACN103389120B (en) | 2013-07-29 | 2013-07-29 | Optical fiber based on wavelength-division multiplex declines and swings chamber sensing array apparatus |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310320406.3ACN103389120B (en) | 2013-07-29 | 2013-07-29 | Optical fiber based on wavelength-division multiplex declines and swings chamber sensing array apparatus |
| Publication Number | Publication Date |
|---|---|
| CN103389120A CN103389120A (en) | 2013-11-13 |
| CN103389120Btrue CN103389120B (en) | 2015-12-23 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310320406.3AExpired - Fee RelatedCN103389120B (en) | 2013-07-29 | 2013-07-29 | Optical fiber based on wavelength-division multiplex declines and swings chamber sensing array apparatus |
| Country | Link |
|---|---|
| CN (1) | CN103389120B (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104811241A (en)* | 2015-04-29 | 2015-07-29 | 中国科学院半导体研究所 | Wavelength-tunable optical time domain reflectometer and fiber ring-down cavity sensor array integrated system |
| CN106091973B (en)* | 2016-07-05 | 2018-03-09 | 哈尔滨理工大学 | Based on annular Research on Cavity Ring Down Spectroscopy strain transducer and strain detecting method |
| CN108801500A (en)* | 2018-08-22 | 2018-11-13 | 太原理工大学 | Fiber Bragg Grating Temperature Sensor Based on Chaotic Correlated Fiber Ring Ring-Down Technology |
| CN114646340A (en)* | 2022-03-16 | 2022-06-21 | 华中科技大学 | Multiplexed FLRD sensor and multi-parameter detection method based on broadband continuous light |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7241986B2 (en)* | 2003-10-08 | 2007-07-10 | Mississippi State University | Fiber ringdown pressure/force sensors |
| CN101298992A (en)* | 2008-06-05 | 2008-11-05 | 西北工业大学 | Distributed type fiber optic sensor based on optical fiber cavity attenuation and vibration technique |
| CN102052930A (en)* | 2010-11-24 | 2011-05-11 | 中国科学院上海光学精密机械研究所 | Fiber bragg grating distributed strain sensor and strain monitoring method thereof |
| CN102494703A (en)* | 2011-11-29 | 2012-06-13 | 武汉理工大学 | Fiber ring-down loop time division multiplexing sensing system |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7241986B2 (en)* | 2003-10-08 | 2007-07-10 | Mississippi State University | Fiber ringdown pressure/force sensors |
| CN101298992A (en)* | 2008-06-05 | 2008-11-05 | 西北工业大学 | Distributed type fiber optic sensor based on optical fiber cavity attenuation and vibration technique |
| CN102052930A (en)* | 2010-11-24 | 2011-05-11 | 中国科学院上海光学精密机械研究所 | Fiber bragg grating distributed strain sensor and strain monitoring method thereof |
| CN102494703A (en)* | 2011-11-29 | 2012-06-13 | 武汉理工大学 | Fiber ring-down loop time division multiplexing sensing system |
| Title |
|---|
| Multichannel-fiber ringdown sensor based on time-division multiplexing;Gaoming Li,etc;《OPTICS LETTERS》;20081215;第33卷(第24期);第3022～3024页* |
| 基于LabVIEW 的光纤布拉格光栅多节点应变监测技术;李意峰等;《光学仪器》;20080831;第30卷(第4期);第37页第2.1和2.2节、图1* |
| Publication number | Publication date |
|---|---|
| CN103389120A (en) | 2013-11-13 |
| Publication | Publication Date | Title |
|---|---|---|
| CN107917738B (en) | Distributed optical fiber sensing system capable of simultaneously measuring temperature, strain and vibration | |
| CN102052930B (en) | Fiber bragg grating distributed strain sensor and strain monitoring method thereof | |
| CN103123285B (en) | Distributed optical fiber sensing device based on chaotic laser coherence method, and measurement method of distributed optical fiber sensing device | |
| US8734011B2 (en) | Distributed optical fiber temperature sensor based on optical fiber delay | |
| CN100552520C (en) | A method and device for multiplexing and demodulating long-period fiber grating arrays | |
| CN201476800U (en) | High-speed multi-channel fiber grating sensor demodulating system based on AWG | |
| CN103604446A (en) | Multi-channel fiber bragg grating absolute wavelength demodulation system based on single detector and method thereof | |
| CN106643832A (en) | Phase-sensitive optical time-domain reflectometer based on linear frequency-modulation pulse and measurement method of phase-sensitive optical time-domain reflectometer | |
| CN101881634A (en) | High-speed multi-channel fiber bragg grating (FBG) sensing demodulation system based on AWG (Arrayed Waveguide Grating) and method | |
| CN104019836A (en) | Brillouin optical-time-domain analyzer based on coherence dual-pulse pair sequence technology and method for restraining common-mode noise by utilizing same | |
| CN111412935B (en) | High-repetition-rate quasi-distributed sensing system based on time division multiplexing | |
| CN101319919B (en) | A method and device for demodulating a frequency-domain fiber grating sensor network | |
| CN103389120B (en) | Optical fiber based on wavelength-division multiplex declines and swings chamber sensing array apparatus | |
| CN105806468A (en) | Fiber bragg grating vibration sensor and detection device thereof | |
| CN102062649B (en) | Dual wavelength light source self-correcting distributed optical fiber Raman temperature sensor for optical fiber Raman frequency shifter | |
| RU102256U1 (en) | DEVICE FOR MEASURING PHYSICAL FIELD PARAMETERS | |
| CN100576049C (en) | A method and device for demodulating a fiber grating sensor network | |
| CN103575313A (en) | Frequency division multiplexing device for multi-longitudinal mode ring cavity laser sensor based on beat frequency technology | |
| CN101267254B (en) | Two-line optical sensing network and its method based on spectrum division multiplexing method | |
| CN104111086A (en) | Low-Brillouin scattering threshold sensing fiber-based optical time domain reflectometer device and method | |
| CN113670353A (en) | A Brillouin Optical Time Domain Analyzer Based on Mode Multiplexing of Few Mode Fibers | |
| CN104811241A (en) | Wavelength-tunable optical time domain reflectometer and fiber ring-down cavity sensor array integrated system | |
| CN203719675U (en) | Coded pulse optical signal-based OTDR device | |
| CN103575309B (en) | The straight cavity sensor frequency division multiplexing of single grating fibers multilongitudianl-mode laser device | |
| CN201302458Y (en) | Fiber grating sensing network demodulating equipment |
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | Granted publication date:20151223 | |
| CF01 | Termination of patent right due to non-payment of annual fee |