CN104792343A - Single-ended structure dynamic measuring Brillouin optical fiber sensing system and sensing method - Google Patents
Single-ended structure dynamic measuring Brillouin optical fiber sensing system and sensing method Download PDFInfo
- Publication number
- CN104792343A CN104792343A CN201510231309.6A CN201510231309A CN104792343A CN 104792343 A CN104792343 A CN 104792343A CN 201510231309 A CN201510231309 A CN 201510231309A CN 104792343 A CN104792343 A CN 104792343A
- Authority
- CN
- China
- Prior art keywords
- light
- module
- frequency
- sensing
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000835 fiber Substances 0.000 claims abstract description 40
- 238000005259 measurement Methods 0.000 claims abstract description 31
- 230000003287 optical effect Effects 0.000 claims abstract description 28
- 230000008033 biological extinction Effects 0.000 claims abstract description 23
- 230000010363 phase shift Effects 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims description 19
- 239000000523 sample Substances 0.000 claims description 9
- 230000035559 beat frequency Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
Landscapes
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Transform (AREA)
Abstract
本发明公开了一种单端结构动态测量的布里渊光纤传感系统与传感方法，传感系统激光器光源通过第一耦合器输出两路连续光，第一路连续光进入调制高消光比模块的输入端，调制高消光比模块连接到第二耦合器的一个输入端；第二路连续光进入相移调制模块，相移调制模块连接到第二耦合器的另一个输入端；第二耦合器接入光环形器的1端口，光环形器的2端口通过传感光纤与单端模块相接；光环形器的3端口与解调模块相接。单端结构实现了BOTDA中标称测量距离即为有效测量距离，解决了现有技术在实际测量中系统需要双端接入和有效传感距离只有标称传感长度一半的问题；提高了电光调制器的消光比、减少了测量时间，实现了动态测量、长距离动态应变的监测功能。
The invention discloses a Brillouin optical fiber sensing system and sensing method for dynamic measurement of a single-end structure. The laser light source of the sensing system outputs two continuous lights through the first coupler, and the first continuous light enters into the modulation and has a high extinction ratio. The input end of the module, the modulation high extinction ratio module is connected to an input end of the second coupler; the second continuous light enters the phase shift modulation module, and the phase shift modulation module is connected to the other input end of the second coupler; the second The coupler is connected to port 1 of the optical circulator, and port 2 of the optical circulator is connected to the single-ended module through a sensing fiber; port 3 of the optical circulator is connected to the demodulation module. The single-ended structure realizes that the nominal measurement distance in BOTDA is the effective measurement distance, which solves the problem that the system needs double-ended access and the effective sensing distance is only half of the nominal sensing length in the actual measurement of the prior art; it improves the electro-optic The extinction ratio of the modulator reduces the measurement time and realizes dynamic measurement and long-distance dynamic strain monitoring.
Description
技术领域 technical field
本发明涉及光纤传感技术，具体是一种单端结构动态测量的布里渊光纤传感系统与传感方法。 The invention relates to optical fiber sensing technology, in particular to a Brillouin optical fiber sensing system and sensing method for dynamic measurement of a single-end structure.
背景技术 Background technique
当光纤中相向传输的两束光波的频率差在光纤固有布里渊增益范围内时，这两束光通过声波场发生受激布里渊作用，两束光之间发生能量转移，当两束光的频率差等于光纤固有的布里渊频移（Brillouin frequency shift，简称 BFS）时，能量转移量最大，据此可以测量出沿光纤长度的布里渊频移分布，布里渊光时域分析（Brillouin optical time domain analysis，简称BOTDA）技术正是基于上述原理，并利用布里渊频移（BFS）与温度和应变之间的线性关系来实现分布式温度和应变传感的。BOTDA具有长距离、高测量精度等特点，在桥梁大坝等大型土木工程和油气管道的结构健康监测中有着巨大的潜在用途。 When the frequency difference of the two beams of light waves transmitted in opposite directions in the fiber is within the range of the inherent Brillouin gain of the fiber, the two beams of light will undergo stimulated Brillouin interaction through the acoustic wave field, and energy transfer will occur between the two beams of light. When the two beams When the frequency difference of light is equal to the inherent Brillouin frequency shift (BFS) of the optical fiber, the amount of energy transfer is the largest. Based on this, the Brillouin frequency shift distribution along the length of the optical fiber can be measured, and the Brillouin optical time domain Brillouin optical time domain analysis (BOTDA) technology is based on the above principles, and uses the linear relationship between Brillouin frequency shift (BFS) and temperature and strain to realize distributed temperature and strain sensing. BOTDA has the characteristics of long distance and high measurement accuracy, and has great potential applications in structural health monitoring of large civil engineering such as bridges and dams and oil and gas pipelines.
传统的BOTDA系统中，系统在检测时需要在光纤的两端分别注入泵浦光和探测光，因此在实际测量中系统的有效传感距离只有标称传感长度的一半。另一方面，双端注入在实际使用中不方便。同时，在使用电光调制器调制脉冲光的时候，由于电光调制器的消光比有限，必然会在系统中产生泄漏的连续光，这些连续光将会在传感光纤干扰实际数据的测量。为了提高电光调制器的消光比，减少漏光在系统中的影响，高消光比的电光调制器被要求使用，这将造成系统仪器的成本将急剧提升。除此之外，传统BOTDA需要对泵浦光和探测光的频率差进行扫频以获取布里渊频移，扫频非常耗时，因此传统基于扫频的BOTDA系统不适用动态事件的测量。 In the traditional BOTDA system, the system needs to inject pump light and probe light at both ends of the optical fiber during detection, so the effective sensing distance of the system is only half of the nominal sensing length in actual measurement. On the other hand, double-ended injection is inconvenient in practical use. At the same time, when the electro-optic modulator is used to modulate pulsed light, due to the limited extinction ratio of the electro-optic modulator, leaked continuous light will inevitably be generated in the system, which will interfere with the measurement of actual data in the sensing fiber. In order to improve the extinction ratio of the electro-optic modulator and reduce the influence of light leakage in the system, an electro-optic modulator with a high extinction ratio is required, which will cause a sharp increase in the cost of system instruments. In addition, the traditional BOTDA needs to sweep the frequency difference between the pump light and the probe light to obtain the Brillouin frequency shift. The frequency sweep is very time-consuming, so the traditional sweep-based BOTDA system is not suitable for the measurement of dynamic events.
发明内容 Contents of the invention
针对现有技术的不足，本发明提供一种单端结构动态测量的布里渊光纤传感系统与传感方法。这种系统的优点是：单端结构可以实现BOTDA中标称测量距离即为有效测量距离；这种方法的优点是：可以提高电光调制器的消光比、可以减少测量时间，实现动态测量、能实现长距离动态应变的监测功能。 Aiming at the deficiencies of the prior art, the invention provides a Brillouin optical fiber sensing system and sensing method for dynamic measurement of single-end structures. The advantage of this system is: the single-ended structure can realize that the nominal measurement distance in BOTDA is the effective measurement distance; Realize the monitoring function of long-distance dynamic strain.
实现本发明的技术方案是： Realize the technical scheme of the present invention is:
一种单端结构动态测量的布里渊光纤传感系统，包括 A Brillouin fiber optic sensing system for dynamic measurement of single-ended structures, comprising
调制高消光比模块，所述调制高消光比模块利用脉冲光控制射频开关进而控制射频信号对电光调制器的信号输入，调制出脉冲光的同时微波源对泵浦光进行了调制， 调制成两个分别为v0+fm和v0-fm的反斯托克斯和斯托克斯的光； Modulating the high extinction ratio module, the modulation high extinction ratio module uses the pulsed light to control the radio frequency switch and then controls the signal input of the radio frequency signal to the electro-optical modulator, and the microwave source modulates the pumping light while the pulsed light is modulated to form two anti-Stokes and Stokes lights of v 0 +f m and v 0 -f m respectively;
相移调制模块，所述相移调制模块通过对探测光进行相位调制； A phase-shift modulation module, the phase-shift modulation module performs phase modulation on the detection light;
解调模块，所述解调模块对带有信号的光进行相位解调； A demodulation module, the demodulation module performs phase demodulation on the light with the signal;
单端模块，其为FC/PC连接器，连续光通过传感光纤，在FC/PC连接器端面发生反射之后，再进入传感光纤并在传感光纤中与泵浦光发生散射； Single-ended module, which is a FC/PC connector, the continuous light passes through the sensing fiber, and after being reflected on the end face of the FC/PC connector, it enters the sensing fiber and scatters with the pump light in the sensing fiber;
激光器光源通过第一耦合器输出两路连续光，第一路连续光进入调制高消光比模块的输入端，调制高消光比模块的输出端连接到第二耦合器的一个输入端；第二路连续光进入相移调制模块的输入端，相移调制模块的输出端连接到第二耦合器的另一个输入端；第二耦合器的输出端接入光环形器的1端口，光环形器的2端口通过传感光纤与单端模块相接；光环形器的3端口与解调模块相接。 The laser light source outputs two channels of continuous light through the first coupler, the first channel of continuous light enters the input terminal of the modulation high extinction ratio module, and the output terminal of the modulation high extinction ratio module is connected to an input terminal of the second coupler; the second channel The continuous light enters the input end of the phase-shift modulation module, and the output end of the phase-shift modulation module is connected to the other input end of the second coupler; the output end of the second coupler is connected to port 1 of the optical circulator, and the output end of the optical circulator Port 2 is connected to the single-ended module through the sensing fiber; port 3 of the optical circulator is connected to the demodulation module.
所述的调制高消光比模块包括第一微波信号源、射频开关、脉冲信号发生器、电光调制器和滤波器，第一微波信号源通过射频开关与脉冲发生器相连，射频开关的另一端连接电光调制器的射频接口；电光调制器的输出端连接滤波器的输入端。 The modulation high extinction ratio module includes a first microwave signal source, a radio frequency switch, a pulse signal generator, an electro-optic modulator and a filter, the first microwave signal source is connected to the pulse generator through a radio frequency switch, and the other end of the radio frequency switch is connected to The radio frequency interface of the electro-optic modulator; the output end of the electro-optic modulator is connected to the input end of the filter.
所述第一微波信号源输出到电光调制器的微波频率fm为10GHz。 The microwave frequency f m output from the first microwave signal source to the electro-optic modulator is 10 GHz.
所述相移调制模块包括单边带调制器和第二微波信号源，第二微波信号源输出到单边带调制器的频率fRF范围为500MHz-1500MHz。 The phase-shift modulation module includes a single-sideband modulator and a second microwave signal source, and the frequency f RF output from the second microwave signal source to the single-sideband modulator ranges from 500MHz to 1500MHz.
使用上述单端结构动态测量的布里渊光纤传感系统的传感方法，包括如下步骤： The sensing method of the Brillouin optical fiber sensing system using the dynamic measurement of the above-mentioned single-ended structure comprises the following steps:
激光器发出频率为v0的连续光被第一耦合器分成两路连续光，即第一路连续光和第二路连续光； The continuous light with frequency v0 emitted by the laser is divided into two continuous lights by the first coupler, that is, the first continuous light and the second continuous light;
第一路连续光由工作在抑制载频模式的电光调制器进行强度调制，调制成频率分别为v0+fm和v0-fm的反斯托克斯和斯托克斯的光；其中脉冲信号发生器通过脉冲控制射频开关来调控第一微波信号源对电光调制器输入，fm为第一微波信号源输出的微波调制频率；上述两个频率的光波经过滤波器进行滤波，滤波后频率为v0-fm的脉冲光被保留下来，经过第一隔离器经掺铒光纤放大器放大到预期峰值功率后通过偏扰器进入第二耦合器； The first continuous light is intensity-modulated by an electro-optic modulator working in the suppressed carrier frequency mode, and modulated into anti-Stokes and Stokes lights with frequencies v 0 +f m and v 0 -f m respectively; Wherein the pulse signal generator regulates the input of the first microwave signal source to the electro-optic modulator through the pulse control radio frequency switch, and f m is the microwave modulation frequency output by the first microwave signal source; the light waves of the above two frequencies are filtered through the filter, and the filter Afterwards, the pulsed light with a frequency of v 0 -f m is retained, passed through the first isolator, amplified by the erbium-doped fiber amplifier to the expected peak power, and then enters the second coupler through the deflector;
第二路连续光由单边带调制器进行相位调制，调制成频率分别为v0和v0+fRF的两个不同频率成分的光信号进入第二耦合器，其中fRF为第二微波信号源输出给单边带调制器的调制频率；含有两个频率的连续光与第一路调制好的泵浦脉冲光经第二耦合器进入光环形器；含有两个频率的连续光经过传感光纤在与传感光纤末端相连接的FC/PC连接器端面发生菲涅尔反射，产生的反射信号光中载波信号为本振光其频率为v0，频率为v0+fRF的信号光为探测信号；探测信号光与泵浦脉冲光传感光纤相遇时产生受激布里渊散射效应，频率为v0+fRF的探测光信号携带了沿传感光纤分布的各点应变信息；本振光与探测光信号经光环形器后输入到平衡光电探测器，由平衡光电探测器进行光电转换产生拍频信号，拍频信号由数据采集处理模块采集和处理，获取探测信号光波的布里渊相移，根据布里渊相移与应变的关系，实现分布式动态应变测量。 The second path of continuous light is phase-modulated by the single-sideband modulator, and the modulated optical signals of two different frequency components with frequencies v 0 and v 0 + f RF enter the second coupler, where f RF is the second microwave The signal source outputs the modulation frequency to the SSB modulator; the continuous light containing two frequencies and the first modulated pump pulse light enter the optical circulator through the second coupler; the continuous light containing two frequencies passes through the transmission Fresnel reflection occurs on the end face of the FC/PC connector connected to the end of the sensing fiber, and the carrier signal in the reflected signal light is a local oscillator with a frequency of v 0 and a signal of frequency v 0 +f RF The light is the detection signal; the stimulated Brillouin scattering effect occurs when the detection signal light meets the pump pulse optical sensing fiber, and the detection light signal with a frequency of v 0 +f RF carries the strain information of each point distributed along the sensing fiber ; The local oscillator light and the detection light signal are input to the balanced photodetector after the optical circulator, and the balance photoelectric detector performs photoelectric conversion to generate a beat frequency signal. The beat frequency signal is collected and processed by the data acquisition and processing module to obtain the light wave of the detection signal. Brillouin phase shift, according to the relationship between Brillouin phase shift and strain, realizes distributed dynamic strain measurement.
探测光和泵浦光的频率是固定的，且探测光和泵浦光的频率差等于传感光纤固有受激布里渊增益谱上升沿一半处时所对应的频率。 The frequencies of the probe light and the pump light are fixed, and the frequency difference between the probe light and the pump light is equal to the frequency corresponding to half of the rising edge of the intrinsic stimulated Brillouin gain spectrum of the sensing fiber.
第一微波信号源的信号输入是由脉冲信号源控制射频开关进行注入。 The signal input of the first microwave signal source is injected by the radio frequency switch controlled by the pulse signal source.
这种系统的优点是：单端结构实现了BOTDA中标称测量距离即为有效测量距离，解决了现有技术在检测时需要在光纤的两端分别注入泵浦光和探测光，实际测量中系统的有效传感距离只有标称传感长度一半的问题； The advantage of this system is: the single-ended structure realizes that the nominal measurement distance in BOTDA is the effective measurement distance. The effective sensing distance of the system is only half of the nominal sensing length;
这种方法的优点是：提高了电光调制器的消光比、减少了测量时间，实现了动态测量、实现了长距离动态应变的监测功能。 The advantages of this method are: the extinction ratio of the electro-optic modulator is improved, the measurement time is reduced, the dynamic measurement is realized, and the long-distance dynamic strain monitoring function is realized.
附图说明 Description of drawings
图1为实施例中单端结构动态测量的布里渊光纤传感系统的结构示意图； Fig. 1 is the structural representation of the Brillouin optical fiber sensing system of single-ended structure dynamic measurement in the embodiment;
图2为是泵浦脉冲与探测光相互作用过程的示意图； Figure 2 is a schematic diagram of the interaction process between the pump pulse and the probe light;
图3为通过脉冲控制射频开关控制调制高消光比的脉冲光的示意图。 Fig. 3 is a schematic diagram of controlling and modulating pulsed light with high extinction ratio by pulse-controlled radio frequency switch.
图中1.激光器 2.第一耦合器 3.第一微波信号源 4.射频开关 5.脉冲信号发生器 6.电光调制器 7.滤波器 8.第一隔离器 9.掺铒光纤放大器 10.扰偏器 11.单边带调制器 12.第二微波信号源 13.第二隔离器 14.第二耦合器 15.光环形器 16.传感光纤 17.FC/PC连接器 18.平衡光电探测器 19.数据采集处理模块。 In the figure 1. Laser 2. First coupler 3. First microwave signal source 4. Radio frequency switch 5. Pulse signal generator 6. Electro-optic modulator 7. Filter 8. First isolator 9. Erbium-doped fiber amplifier 10 .Polarizer 11.Single sideband modulator 12.Second microwave signal source 13.Second isolator 14.Second coupler 15.Optical circulator 16.Sensing fiber 17.FC/PC connector 18.Balanced Photoelectric detector 19. Data acquisition and processing module.
具体实施方式 Detailed ways
下面结合附图和实施例对本发明内容作进一步的阐述，但不是对本发明的限定。 The content of the present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited thereto.
实施例： Example:
参照图1，一种单端结构动态测量的布里渊光纤传感系统，包括 Referring to Fig. 1, a Brillouin optical fiber sensing system for dynamic measurement of single-ended structures, including
调制高消光比模块，所述调制高消光比模块利用脉冲光控制射频开关进而控制射频信号对电光调制器的信号输入，调制出脉冲光的同时微波源对泵浦光进行了调制， 调制成两个频率分别为v0+fm和v0-fm的反斯托克斯和斯托克斯的光； Modulating the high extinction ratio module, the modulation high extinction ratio module uses the pulsed light to control the radio frequency switch and then controls the signal input of the radio frequency signal to the electro-optical modulator, and the microwave source modulates the pumping light while the pulsed light is modulated to form two Anti-Stokes and Stokes light with frequencies v 0 +f m and v 0 -f m respectively;
相移调制模块，所述相移调制模块通过对探测光进行相位调制； A phase-shift modulation module, the phase-shift modulation module performs phase modulation on the detection light;
解调模块，所述解调模块对带有信号的光进行相位解调； A demodulation module, the demodulation module performs phase demodulation on the light with the signal;
单端模块，其为FC/PC连接器17，连续光通过传感光纤16，在FC/PC连接器17端面发生反射之后，再进入传感光纤16并在传感光纤16中各处与泵浦光发生散射； Single-ended module, which is FC/PC connector 17, continuous light passes through sensing fiber 16, and after being reflected at the end face of FC/PC connector 17, enters sensing fiber 16 and communicates with the pump everywhere in sensing fiber 16 Pu light is scattered;
激光器1光源通过第一耦合器2输出两路连续光，第一路连续光进入调制高消光比模块的输入端，调制高消光比模块的输出端连接到第二耦合器14的一个输入端；第二路连续光进入相移调制模块的输入端，相移调制模块的输出端连接到第二耦合器14的另一个输入端；第二耦合器14的输出端接入光环形器15的1端口，光环形器15的2端口通过传感光纤16与FC/PC连接器17相接；光环形器15的3端口与解调模块相接。 The light source of the laser 1 outputs two channels of continuous light through the first coupler 2, the first channel of continuous light enters the input end of the modulation high extinction ratio module, and the output end of the modulation high extinction ratio module is connected to an input end of the second coupler 14; The second road continuous light enters the input end of the phase-shift modulation module, and the output end of the phase-shift modulation module is connected to the other input end of the second coupler 14; the output end of the second coupler 14 is connected to 1 of the optical circulator 15 Port 2 of the optical circulator 15 is connected to the FC/PC connector 17 through the sensing fiber 16; port 3 of the optical circulator 15 is connected to the demodulation module.
具体地， specifically,
所述的调制高消光比模块包括第一微波信号源3、射频开关4、脉冲信号发生器5、电光调制器6和滤波器7，第一微波信号源3通过射频开关4与脉冲发生器5相连，射频开关4的另一端连接电光调制器6的射频接口；电光调制器6的输出端连接滤波器7的输入端，滤波器7的输出端与第二耦合器14的一个输入端连接。 The described modulation high extinction ratio module comprises a first microwave signal source 3, a radio frequency switch 4, a pulse signal generator 5, an electro-optical modulator 6 and a filter 7, and the first microwave signal source 3 passes through a radio frequency switch 4 and a pulse generator 5 connected, the other end of the radio frequency switch 4 is connected to the radio frequency interface of the electro-optic modulator 6;
所述第一微波信号源3输出到电光调制器6的微波频率fm为10GHz。 The microwave frequency f m output from the first microwave signal source 3 to the electro-optic modulator 6 is 10 GHz.
所述相移调制模块包括单边带调制器11和第二微波信号源12，第二微波信号源12与单边带调制器11连接，第一耦合器2的输出端通过单边带调制器11连接到第二耦合器14的一个输入端，单边带调制器11通过第二隔离器13与第二耦合器14连接。 The phase-shift modulation module includes a single sideband modulator 11 and a second microwave signal source 12, the second microwave signal source 12 is connected with the single sideband modulator 11, and the output end of the first coupler 2 passes through the single sideband modulator 11 is connected to one input end of the second coupler 14 , and the single sideband modulator 11 is connected to the second coupler 14 through the second isolator 13 .
第二微波信号源12输出到单边带调制器11的频率fRF范围为500MHz-1500MHz。 The frequency f RF output from the second microwave signal source 12 to the single sideband modulator 11 ranges from 500 MHz to 1500 MHz.
所述解调模块包括平衡光电探测器18和数据采集处理模块19，对带有信号的光进行相位解调，平衡光电探测器18与光环形器15的3端口连接。 The demodulation module includes a balanced photodetector 18 and a data acquisition and processing module 19 to perform phase demodulation on the light with the signal, and the balanced photodetector 18 is connected to the 3-port of the optical circulator 15 .
滤波器7的输出端顺序通过第一隔离器8、掺铒光纤放大器9、偏扰器10与第二耦合器14的一个输入端连接。 The output end of the filter 7 is connected to an input end of the second coupler 14 sequentially through the first isolator 8 , the erbium-doped fiber amplifier 9 , and the scrambler 10 .
使用上述单端结构动态测量的布里渊光纤传感系统的传感方法，包括如下步骤： The sensing method of the Brillouin optical fiber sensing system using the dynamic measurement of the above-mentioned single-ended structure comprises the following steps:
激光器1发出频率为v0的连续光被第一耦合器2分成两路连续光，即第一路连续光和第二路连续光； The continuous light with frequency v0 emitted by the laser 1 is divided into two continuous lights by the first coupler 2, that is, the first continuous light and the second continuous light;
第一路连续光由工作在抑制载频模式的电光调制器6进行强度调制，调制成频率分别为v0+fm和v0-fm的反斯托克斯和斯托克斯的光；其中脉冲信号发生器5通过脉冲控制射频开关4来调控第一微波信号源3对电光调制器6输入，fm为第一微波信号源3输出的微波调制频率；上述两个频率的光波经过滤波器7进行滤波，滤波后频率为v0-fm的脉冲光被保留下来，如图三所示，经过第一隔离器8经掺铒光纤放大器9放大到预期峰值功率后通过偏扰器10进入第二耦合器14； The first continuous light is intensity-modulated by the electro-optic modulator 6 working in the suppressed carrier frequency mode, and modulated into anti-Stokes and Stokes light with frequencies v 0 +f m and v 0 -f m Wherein the pulse signal generator 5 regulates the input of the first microwave signal source 3 to the electro-optical modulator 6 through the pulse control radio frequency switch 4, and f m is the microwave modulation frequency of the first microwave signal source 3 output; the light waves of the above two frequencies pass through The filter 7 performs filtering, and after filtering, the pulsed light with a frequency of v 0 -f m is retained. As shown in Figure 3, after passing through the first isolator 8 and amplifying it to the expected peak power by the erbium-doped fiber amplifier 9, it passes through the deflector 10 into the second coupler 14;
第二路连续光由单边带调制器11进行相位调制，调制成频率分别为v0和v0+fRF的两个不同频率成分的光信号进入第二耦合器14，其中fRF为第二微波信号源12输出给单边带调制器11的调制频率；含有两个频率的连续光与第一路调制好的泵浦脉冲光经第二耦合器14进入光环形器15；含有两个频率的连续光经过传感光纤16在与传感光纤16末端相连接的FC/PC连接器17端面发生菲涅尔反射，产生的反射信号光中载波信号为本振光其频率为v0，频率为v0+fRF的信号光为探测信号；探测信号光与泵浦脉冲光传感光纤16相遇时产生受激布里渊散射效应，频率为v0+fRF的探测光信号携带了沿传感光纤16分布的各点应变信息，如图二所示；本振光与探测光信号经光环形器15后输入到平衡光电探测器18，由平衡光电探测器18进行光电转换产生拍频信号，拍频信号由数据采集处理模块19采集和处理，获取探测信号光波的布里渊相移，根据布里渊相移与应变的关系，实现分布式动态应变测量。 The second path of continuous light is phase-modulated by the single-sideband modulator 11, and modulated into optical signals with two different frequency components whose frequencies are respectively v 0 and v 0 +f RF enter the second coupler 14, where f RF is the first Two microwave signal sources 12 output the modulation frequency to the single sideband modulator 11; the continuous light containing two frequencies and the first modulated pump pulse light enter the optical circulator 15 through the second coupler 14; The frequency continuous light passes through the sensing fiber 16 and undergoes Fresnel reflection at the end face of the FC/PC connector 17 connected to the end of the sensing fiber 16, and the carrier signal in the reflected signal light generated is local oscillator light with a frequency of v 0 , The signal light with a frequency of v 0 +f RF is the detection signal; the stimulated Brillouin scattering effect is generated when the detection signal light meets the pump pulse optical sensing fiber 16, and the detection light signal with a frequency of v 0 +f RF carries The strain information at each point distributed along the sensing fiber 16 is shown in Figure 2; the local oscillator light and detection light signals are input to the balanced photodetector 18 after passing through the optical circulator 15, and the balanced photoelectric detector 18 performs photoelectric conversion to generate beats. The beat frequency signal is collected and processed by the data acquisition and processing module 19 to obtain the Brillouin phase shift of the detection signal light wave, and realize distributed dynamic strain measurement according to the relationship between the Brillouin phase shift and strain.
探测光和泵浦光的频率是固定的，且探测光和泵浦光的频率差等于传感光纤固有受激布里渊增益谱上升沿一半处时所对应的频率。 The frequencies of the probe light and the pump light are fixed, and the frequency difference between the probe light and the pump light is equal to the frequency corresponding to half of the rising edge of the intrinsic stimulated Brillouin gain spectrum of the sensing fiber.
第一微波信号源3的信号输入是由脉冲信号源控制射频开关进行注入。 The signal input of the first microwave signal source 3 is injected by the radio frequency switch controlled by the pulse signal source.
所述第一微波信号源3输出到电光调制器6的微波频率fm为10GHz。 The microwave frequency f m output from the first microwave signal source 3 to the electro-optic modulator 6 is 10 GHz.
第二微波信号源12输出到单边带调制器11的频率fRF范围为500MHz-1500MHz。 The frequency f RF output from the second microwave signal source 12 to the single sideband modulator 11 ranges from 500 MHz to 1500 MHz.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510231309.6A CN104792343B (en) | 2015-05-08 | 2015-05-08 | A Brillouin fiber optic sensing system and sensing method for dynamic measurement of single-ended structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510231309.6A CN104792343B (en) | 2015-05-08 | 2015-05-08 | A Brillouin fiber optic sensing system and sensing method for dynamic measurement of single-ended structures |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104792343A true CN104792343A (en) | 2015-07-22 |
| CN104792343B CN104792343B (en) | 2017-09-01 |
Family
ID=53557341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510231309.6A Expired - Fee Related CN104792343B (en) | 2015-05-08 | 2015-05-08 | A Brillouin fiber optic sensing system and sensing method for dynamic measurement of single-ended structures |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104792343B (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105571507A (en) * | 2016-01-15 | 2016-05-11 | 华北电力大学（保定） | Single-ended vector BOTDA dynamic strain measurement method, and measurement apparatus thereof |
| CN105674905A (en) * | 2016-01-15 | 2016-06-15 | 华北电力大学（保定） | Pulse pre-pumping single-ended vector BOTDA dynamic strain measuring method and measuring device |
| CN105865656A (en) * | 2015-12-07 | 2016-08-17 | 华北电力大学（保定） | Single-end RBOTDA sensing system for inhibiting non-local effect at high signal-to-noise ratio |
| CN105928634A (en) * | 2016-04-21 | 2016-09-07 | 太原理工大学 | High-voltage cable temperature measuring device and method for single-ended Brillouin optical coherence domain analysis |
| CN107044862A (en) * | 2017-01-20 | 2017-08-15 | 石家庄铁道大学 | Hybrid fiber sensor-based system |
| CN107389315A (en) * | 2017-07-19 | 2017-11-24 | 南京航空航天大学 | Optical device frequency response measurement method and measurement apparatus |
| CN107764298A (en) * | 2017-12-05 | 2018-03-06 | 广西师范大学 | A kind of single-ended brillouin distributed sensor-based system and method for sensing of the adjustable frequency shifter structure of Brillouin |
| CN107941373A (en) * | 2017-12-25 | 2018-04-20 | 北京市热力工程设计有限责任公司 | Thermometric based on heat distribution pipeline leaks hunting cable network |
| CN108051112A (en) * | 2017-12-25 | 2018-05-18 | 北京市热力工程设计有限责任公司 | A kind of monitoring temperature cable network based on heat distribution pipeline |
| CN108375386A (en) * | 2018-02-06 | 2018-08-07 | 广西师范大学 | A kind of the Brillouin light fiber sensor system and method for sensing of adjustable frequency displacement structure |
| CN109084830A (en) * | 2018-06-25 | 2018-12-25 | 太原理工大学 | Fibre-optical multiparameter detection system and method towards goaf traffic infrastructure |
| CN109186736A (en) * | 2018-07-18 | 2019-01-11 | 广西师范大学 | It is a kind of can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device and measurement method |
| CN109556659A (en) * | 2018-12-21 | 2019-04-02 | 闽南师范大学 | A kind of method and device thereof of single-ended detection Brillouin's dynamic raster sensing |
| CN110231058A (en) * | 2019-05-28 | 2019-09-13 | 太原理工大学 | A kind of the chaos Brillouin's dynamic raster generation device and method of ground noise inhibition |
| CN110487309A (en) * | 2019-09-16 | 2019-11-22 | 北京邮电大学 | A kind of fiber-optic probe method and system |
| CN112697061A (en) * | 2021-01-04 | 2021-04-23 | 无锡科晟光子科技有限公司 | Optical fiber strain system based on filter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120123702A1 (en) * | 2010-11-16 | 2012-05-17 | Xin Chen | System and Method for Simultaneously Determining Strain and Temperature Characteristics of an Object |
| CN103292831A (en) * | 2013-05-31 | 2013-09-11 | 武汉康特圣思光电技术有限公司 | Single-ended Brillouin optical time-domain analysis sensor with fiber grating reflection filter structure |
| CN103674084A (en) * | 2013-12-16 | 2014-03-26 | 华北电力大学（保定） | Method for simultaneously measuring distributed type temperatures and strain |
| CN103913185A (en) * | 2014-03-31 | 2014-07-09 | 广西师范大学 | Brillouin optical fiber sensing system and method |
| CN204630588U (en) * | 2015-05-08 | 2015-09-09 | 广西师范大学 | A kind of Brillouin light fiber sensor system of single-ended structure kinetic measurement |
-
2015
- 2015-05-08 CN CN201510231309.6A patent/CN104792343B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120123702A1 (en) * | 2010-11-16 | 2012-05-17 | Xin Chen | System and Method for Simultaneously Determining Strain and Temperature Characteristics of an Object |
| CN103292831A (en) * | 2013-05-31 | 2013-09-11 | 武汉康特圣思光电技术有限公司 | Single-ended Brillouin optical time-domain analysis sensor with fiber grating reflection filter structure |
| CN103674084A (en) * | 2013-12-16 | 2014-03-26 | 华北电力大学（保定） | Method for simultaneously measuring distributed type temperatures and strain |
| CN103913185A (en) * | 2014-03-31 | 2014-07-09 | 广西师范大学 | Brillouin optical fiber sensing system and method |
| CN204630588U (en) * | 2015-05-08 | 2015-09-09 | 广西师范大学 | A kind of Brillouin light fiber sensor system of single-ended structure kinetic measurement |
Non-Patent Citations (2)
| Title |
|---|
| 王菊等: ""基于布里渊损耗的单端分布式光纤传感系统研究"", 《激光与红外》 * |
| 胡君辉: ""基于瑞利和布里渊散射效应的光纤传感系统的研究"", 《中国博士学位论文全文数据库 信息科技辑》 * |
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865656B (en) * | 2015-12-07 | 2018-07-06 | 华北电力大学（保定） | A kind of high s/n ratio inhibits the single-ended RBOTDA sensor-based systems of non-local effect |
| CN105865656A (en) * | 2015-12-07 | 2016-08-17 | 华北电力大学（保定） | Single-end RBOTDA sensing system for inhibiting non-local effect at high signal-to-noise ratio |
| CN105674905A (en) * | 2016-01-15 | 2016-06-15 | 华北电力大学（保定） | Pulse pre-pumping single-ended vector BOTDA dynamic strain measuring method and measuring device |
| CN105571507B (en) * | 2016-01-15 | 2018-04-03 | 华北电力大学（保定） | A kind of method and its measurement apparatus of single-ended vector B OTDA dynamic strain measurements |
| CN105674905B (en) * | 2016-01-15 | 2018-04-03 | 华北电力大学（保定） | The single-ended vector B OTDA dynamic strain measurement methods of the pre- pumping of pulse and device |
| CN105571507A (en) * | 2016-01-15 | 2016-05-11 | 华北电力大学（保定） | Single-ended vector BOTDA dynamic strain measurement method, and measurement apparatus thereof |
| CN105928634A (en) * | 2016-04-21 | 2016-09-07 | 太原理工大学 | High-voltage cable temperature measuring device and method for single-ended Brillouin optical coherence domain analysis |
| CN105928634B (en) * | 2016-04-21 | 2018-10-26 | 太原理工大学 | The temperature measuring device for high-voltage cable and method of the relevant domain analysis of single-ended Brillouin light |
| CN107044862A (en) * | 2017-01-20 | 2017-08-15 | 石家庄铁道大学 | Hybrid fiber sensor-based system |
| CN107044862B (en) * | 2017-01-20 | 2023-09-05 | 石家庄铁道大学 | Hybrid fiber optic sensing system |
| CN107389315A (en) * | 2017-07-19 | 2017-11-24 | 南京航空航天大学 | Optical device frequency response measurement method and measurement apparatus |
| CN107764298A (en) * | 2017-12-05 | 2018-03-06 | 广西师范大学 | A kind of single-ended brillouin distributed sensor-based system and method for sensing of the adjustable frequency shifter structure of Brillouin |
| CN108051112A (en) * | 2017-12-25 | 2018-05-18 | 北京市热力工程设计有限责任公司 | A kind of monitoring temperature cable network based on heat distribution pipeline |
| CN107941373A (en) * | 2017-12-25 | 2018-04-20 | 北京市热力工程设计有限责任公司 | Thermometric based on heat distribution pipeline leaks hunting cable network |
| CN108375386A (en) * | 2018-02-06 | 2018-08-07 | 广西师范大学 | A kind of the Brillouin light fiber sensor system and method for sensing of adjustable frequency displacement structure |
| CN109084830B (en) * | 2018-06-25 | 2020-08-21 | 太原理工大学 | Optical fiber multi-parameter detection system and method for gob traffic infrastructure |
| CN109084830A (en) * | 2018-06-25 | 2018-12-25 | 太原理工大学 | Fibre-optical multiparameter detection system and method towards goaf traffic infrastructure |
| CN109186736A (en) * | 2018-07-18 | 2019-01-11 | 广西师范大学 | It is a kind of can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device and measurement method |
| CN109556659A (en) * | 2018-12-21 | 2019-04-02 | 闽南师范大学 | A kind of method and device thereof of single-ended detection Brillouin's dynamic raster sensing |
| CN109556659B (en) * | 2018-12-21 | 2023-09-01 | 闽南师范大学 | A single-ended detection method for Brillouin dynamic grating sensing |
| CN110231058A (en) * | 2019-05-28 | 2019-09-13 | 太原理工大学 | A kind of the chaos Brillouin's dynamic raster generation device and method of ground noise inhibition |
| CN110231058B (en) * | 2019-05-28 | 2021-05-11 | 太原理工大学 | Chaotic Brillouin dynamic grating generation device and method with substrate noise suppression function |
| CN110487309A (en) * | 2019-09-16 | 2019-11-22 | 北京邮电大学 | A kind of fiber-optic probe method and system |
| CN112697061A (en) * | 2021-01-04 | 2021-04-23 | 无锡科晟光子科技有限公司 | Optical fiber strain system based on filter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104792343B (en) | 2017-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104792343B (en) | A Brillouin fiber optic sensing system and sensing method for dynamic measurement of single-ended structures | |
| CN103913185B (en) | Brillouin light fiber sensor system and method | |
| CN105490738B (en) | Optical frequency domain reflection method and system based on frequency synthesis | |
| CN104677396B (en) | Dynamic distributed Brillouin optical fiber sensing device and method | |
| CN101975626B (en) | Brillouin scattering based distributive fiber sensing system | |
| CN102546007A (en) | Device and method for realizing frequency measurement of multifrequency microwave signals by using Brillouin scattering | |
| CN105758433B (en) | A kind of distribution type optical fiber sensing equipment based on Brillouin optical fiber laser | |
| US10931079B2 (en) | Brillouin sensing system using optical microwave frequency discriminators and scrambler | |
| CN107543567B (en) | BOCDA distribution type optical fiber sensing equipment and method based on the modulation of physical accidental code | |
| CN103743354B (en) | A kind of dynamic strain measurement method based on Brillouin's phase shift detection and measurement apparatus | |
| CN105628063B (en) | Brillouin optical time domain analysis device and method based on dual wavelength polarized orthogonal light | |
| CN107144731A (en) | A kind of microwave frequency measuring method and device based on highly nonlinear optical fiber stimulated Brillouin scattering effect and Amplitude Ratio | |
| CN108827175A (en) | Distribution type fiber-optic dynamic strain sensing device and method based on wideband chaotic laser light | |
| CN102997949A (en) | Method used for measuring temperature and strain simultaneously and based on brillouin scattering | |
| CN101476901B (en) | Demodulation method of optical fiber F-P sensor | |
| CN111721338A (en) | A Brillouin optical time-domain analysis system with alternating high and low frequency modulation of pump light | |
| CN204630588U (en) | A kind of Brillouin light fiber sensor system of single-ended structure kinetic measurement | |
| CN113890605B (en) | Stimulated Brillouin scattering microwave frequency measuring device and method based on optical chirp chain | |
| CN103763022A (en) | A high spatial resolution optical frequency domain reflectometer system based on high-order sideband swept frequency modulation | |
| CN103983846A (en) | Weak signal detection method based on photoelectric oscillator | |
| CN103616090B (en) | A kind of brillouin distributed optical fiber sensing temp measuring system eliminating optical fiber attenuation | |
| CN203758532U (en) | Brillouin fiber optic sensing system | |
| CN103674082A (en) | A High Spatial Resolution Optical Frequency Domain Reflectometer System Based on Four-Wave Mixing Process | |
| CN205453695U (en) | Optical Frequency Domain Reflectometry Based on Frequency Synthesis | |
| CN114353685A (en) | High-frequency dynamic strain measurement device and method based on chaotic Brillouin phase spectrum |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170901 Termination date: 20210508 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |