CN107436175B - Continuous distributed optical fiber vibration sensing device with broadband sensing capability and method - Google Patents
Continuous distributed optical fiber vibration sensing device with broadband sensing capability and method Download PDFInfo
- Publication number
- CN107436175B CN107436175B CN201710616363.1A CN201710616363A CN107436175B CN 107436175 B CN107436175 B CN 107436175B CN 201710616363 A CN201710616363 A CN 201710616363A CN 107436175 B CN107436175 B CN 107436175B
- Authority
- CN
- China
- Prior art keywords
- laser
- light
- pulse
- wavelength division
- division multiplexer
- 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.)
- Active
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 13
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 21
- 238000001228 spectrum Methods 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000000253 optical time-domain reflectometry Methods 0.000 description 11
- 238000012544 monitoring process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000004044 response Effects 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
本发明公开了一种具有宽频感测能力的连续分布式光纤振动传感装置，包括脉冲发生器、第一激光器、第二激光器、脉冲调制器、掺铒光纤放大器、第一波分复用器、光环行器、探测光纤、第二波分复用器、第一光电探测器、第二光电探测器和信号采集卡。本发明还公开了一种具有宽频感测能力的连续分布式光纤振动传感装置的探测方法，本发明通过对连续光和脉冲光产生的后向瑞利散射光解调，实现对振动的宽频感测以及事件定位。
The invention discloses a continuous distributed optical fiber vibration sensing device with broadband sensing capability, comprising a pulse generator, a first laser, a second laser, a pulse modulator, an erbium-doped fiber amplifier, and a first wavelength division multiplexer , optical circulator, detection fiber, second wavelength division multiplexer, first photodetector, second photodetector and signal acquisition card. The invention also discloses a detection method of a continuous distributed optical fiber vibration sensing device with broadband sensing capability. The invention realizes broadband vibration detection by demodulating the backward Rayleigh scattered light generated by continuous light and pulsed light. Sensing and event location.
Description
技术领域technical field
本发明涉及光纤传感技术领域，特别是一种具有宽频感测能力的连续分布式光纤振动传感装置及方法。The invention relates to the technical field of optical fiber sensing, in particular to a continuous distributed optical fiber vibration sensing device and method with broadband sensing capability.
背景技术Background technique
随着国民经济的发展，我国已进入大型基础设施的大规模建设阶段，其中主要包括地下传输系统（如给排水管道、燃气管道、煤炭传输系统），轨道交通系统（如高铁轨道、地铁轨道、轻轨轨道）和大型土木建设（如大型桥梁）等，因此在实际应用中需要对这些超长距离、大规模基础设施的结构健康状态进行监测，开发研制可靠的大型基础设施的监测系统已成为现今研究的热点。With the development of the national economy, my country has entered a stage of large-scale construction of large-scale infrastructure, which mainly includes underground transmission systems (such as water supply and drainage pipelines, gas pipelines, coal transmission systems), rail transit systems (such as high-speed rail, subway, Therefore, it is necessary to monitor the structural health status of these ultra-long-distance and large-scale infrastructures in practical applications. The development and development of reliable monitoring systems for large-scale infrastructures has become today's research hotspot.
而对这些大型基础设施的健康监测，不仅要求监测系统能够及时发现故障、快速而精确的定位事故发生地，并且需要能够根据故障特征识别故障类型。这些大型基础设施的故障通常表现为振动事件，很多应用场合的故障频率高达十几兆赫兹，比如大型建筑中材料的突然断裂、管道壁裂缝等，这就需要监测系统具有较宽的探测频率范围。The health monitoring of these large-scale infrastructures not only requires the monitoring system to detect faults in time and locate the location of the accident quickly and accurately, but also needs to be able to identify the type of fault according to the fault characteristics. The failures of these large-scale infrastructures are usually manifested as vibration events, and the failure frequency in many applications is as high as ten megahertz, such as the sudden fracture of materials in large buildings, cracks in the pipeline wall, etc., which requires the monitoring system to have a wide detection frequency range .
目前，Φ-OTDR是已报道的基于光时域反射计技术的分布式振动传感系统中应用最广泛的振动监测系统，但其频率响应范围受到监测距离的限制，存在频谱折叠现象，无法准确探测高频事件；而基于干涉原理的光纤分布式振动传感系统虽然具有可探测频率范围宽的优势，但是很难实现振动定位，且干涉仪结构无法做到单端监测，这给实际工程应用带来很多不便。因此，已有研究团队针对以上应用需求，提出将Φ-OTDR与干涉仪结构相结合，用以实现对振动的位置以及频率的同时感测，南京大学的Yixin Zhang、Lan Xia等在《Ahybrid single-end-access MZI and Φ-OTDR vibration sensing system with highfrequency response》中使用MZI和Φ-OTDR的融合系统实现振动事件的宽频感测，且同时得到振动事件的位置信息。融合系统中利用干涉仪结构实现宽频振动感测，但是这个结构需要在光纤末端连接一个反射镜，将连续光反射回前端发生干涉效应，这在安装和损坏后修复复杂过程复杂，对操作人员要求高，难以在工程上推广应用。At present, Φ-OTDR is the most widely used vibration monitoring system in the reported distributed vibration sensing system based on optical time domain reflectometry technology, but its frequency response range is limited by the monitoring distance, and there is a phenomenon of spectrum folding, which cannot be accurate. Detect high-frequency events; while the optical fiber distributed vibration sensing system based on the interference principle has the advantage of a wide range of detectable frequencies, but it is difficult to achieve vibration localization, and the interferometer structure cannot achieve single-end monitoring, which is useful for practical engineering applications. bring a lot of inconvenience. Therefore, some research teams have proposed to combine Φ-OTDR and interferometer structure to realize the simultaneous sensing of vibration position and frequency according to the above application requirements. -end-access MZI and Φ-OTDR vibration sensing system with high frequency response" Using the fusion system of MZI and Φ-OTDR to realize broadband sensing of vibration events, and obtain the location information of vibration events at the same time. In the fusion system, the interferometer structure is used to realize broadband vibration sensing, but this structure needs to connect a mirror at the end of the fiber to reflect the continuous light back to the front end to generate interference effect. It is difficult to popularize and apply in engineering.
发明内容SUMMARY OF THE INVENTION
本发明所要解决的技术问题是克服现有技术的不足而提供一种具有宽频感测能力的连续分布式光纤振动传感装置及方法，可以同时实现高空间分辨率以及宽频振动测量；并且可以根据振动信号本身固有的频率特征来识别事件类型，提高振动事件的识别率。The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a continuous distributed optical fiber vibration sensing device and method with broadband sensing capability, which can simultaneously realize high spatial resolution and broadband vibration measurement; The inherent frequency characteristics of the vibration signal can identify the event type and improve the identification rate of the vibration event.
本发明为解决上述技术问题采用以下技术方案：The present invention adopts the following technical solutions for solving the above-mentioned technical problems:
根据本发明提出的一种具有宽频感测能力的连续分布式光纤振动传感装置，包括脉冲发生器、第一激光器、第二激光器、脉冲调制器、掺铒光纤放大器、第一波分复用器、光环行器、探测光纤、第二波分复用器、第一光电探测器、第二光电探测器和信号采集卡；其中，A continuous distributed optical fiber vibration sensing device with broadband sensing capability proposed according to the present invention includes a pulse generator, a first laser, a second laser, a pulse modulator, an erbium-doped fiber amplifier, and a first wavelength division multiplexing device, optical circulator, detection fiber, second wavelength division multiplexer, first photodetector, second photodetector and signal acquisition card; wherein,
脉冲发生器，用于产生调制脉冲、触发脉冲；调制脉冲输入至脉冲调制器，触发脉冲输入至信号采集卡；The pulse generator is used to generate modulation pulse and trigger pulse; the modulation pulse is input to the pulse modulator, and the trigger pulse is input to the signal acquisition card;
第一激光器，用于产生第一连续模式窄线宽激光，并将其输出至第一波分复用器；a first laser for generating a first continuous mode narrow linewidth laser and outputting it to a first wavelength division multiplexer;
第二激光器，用于产生第二连续模式窄线宽激光，并将其输出至脉冲调制器；a second laser for generating a second continuous mode narrow linewidth laser and outputting it to the pulse modulator;
脉冲调制器，用于根据接收的调制脉冲，将第二连续模式窄线宽激光转换为脉冲光输出至掺铒光纤放大器；The pulse modulator is used for converting the second continuous mode narrow linewidth laser into pulsed light according to the received modulation pulse and outputting it to the erbium-doped fiber amplifier;
掺铒光纤放大器，用于将脉冲光放大后输出至第一波分复用器；An erbium-doped fiber amplifier for amplifying the pulsed light and outputting it to the first wavelength division multiplexer;
第一波分复用器，用于将第一连续模式窄线宽激光和放大后的脉冲光通过两个不同通道进行复用，输出探测光至光环行器；a first wavelength division multiplexer, used for multiplexing the first continuous mode narrow linewidth laser and the amplified pulse light through two different channels, and outputting the probe light to the optical circulator;
光环形器，用于将探测光由其第1端口输入，并由其第2端口注入至探测光纤；Optical circulator, used to input the detection light from its first port, and inject it into the detection fiber from its second port;
探测光纤，用于将产生的背向瑞利散射光输出至光环形器的第2端口，并由光环形器的第3端口输出至第二波分复用器；The detection fiber is used for outputting the generated back-Rayleigh scattered light to the second port of the optical circulator, and from the third port of the optical circulator to the second wavelength division multiplexer;
第二波分复用器，用于将具有不同波长的背向瑞利散射光通过解复用由两个通道分别输出至第一光电探测器、第二光电探测器；The second wavelength division multiplexer is used to output the back Rayleigh scattered light with different wavelengths from two channels to the first photodetector and the second photodetector respectively through demultiplexing;
第一光电探测器，用于将接收到的光转换成第一电信号后输出至信号采集卡；a first photodetector, used for converting the received light into a first electrical signal and outputting it to the signal acquisition card;
第二光电探测器，用于将接收到的光转换成第二电信号后输出至信号采集卡；The second photodetector is used to convert the received light into a second electrical signal and output to the signal acquisition card;
信号采集卡，用于根据触发脉冲，将第一电信号、第二电信号分别转换为数字信号进行后续处理。The signal acquisition card is used to convert the first electrical signal and the second electrical signal into digital signals for subsequent processing according to the trigger pulse.
作为本发明所述的一种具有宽频感测能力的连续分布式光纤振动传感装置进一步优化方案，所述调制脉冲和触发脉冲的周期均与脉冲光的周期同步。As a further optimization scheme of the continuous distributed optical fiber vibration sensing device with broadband sensing capability according to the present invention, the periods of the modulation pulse and the trigger pulse are both synchronized with the period of the pulsed light.
作为本发明所述的一种具有宽频感测能力的连续分布式光纤振动传感装置进一步优化方案，所述第一激光器和第二激光器的波长不同。As a further optimized solution of the continuous distributed optical fiber vibration sensing device with broadband sensing capability according to the present invention, the wavelengths of the first laser and the second laser are different.
作为本发明所述的一种具有宽频感测能力的连续分布式光纤振动传感装置进一步优化方案，所述第一波分复用器和第二波分复用器选用的两个波长通道需与第一激光器和第二激光器的波长相匹配。As a further optimization scheme of the continuous distributed optical fiber vibration sensing device with broadband sensing capability according to the present invention, the two wavelength channels selected by the first wavelength division multiplexer and the second wavelength division multiplexer need to be match the wavelengths of the first and second lasers.
基于上述的一种具有宽频感测能力的连续分布式光纤振动传感装置的探测方法，包括以下步骤：Based on the above-mentioned detection method of a continuous distributed optical fiber vibration sensing device with broadband sensing capability, the method includes the following steps:
步骤一、采用第一激光器产生第一连续模式窄线宽激光；采用第二激光器产生第二连续模式窄线宽激光，将第二连续模式窄线宽激光转换为脉冲光并将其放大，放大后的脉冲光与第一激光器产生的连续模式窄线宽激光通过第一波分复用器复用后，输出探测光至探测光纤中；Step 1. Use the first laser to generate the first continuous mode narrow linewidth laser; use the second laser to generate the second continuous mode narrow linewidth laser, convert the second continuous mode narrow linewidth laser into pulsed light and amplify it, amplify it After the last pulsed light and the continuous mode narrow linewidth laser generated by the first laser are multiplexed by the first wavelength division multiplexer, the detection light is output to the detection fiber;
步骤二、探测光在探测光纤中产生背向瑞利散射光；背向瑞利散射光用于探测振动的频率和位置；In step 2, the detection light generates back-Rayleigh scattered light in the detection fiber; the back-Rayleigh scattered light is used to detect the frequency and position of the vibration;
步骤三、将背向瑞利散射光通过第二波分复用器分成两路，这两路分别由第一光电探测器、第二光电探测器进行探测，得到第一电信号和第二电信号；Step 3: Divide the back-scattered light into two paths through the second wavelength division multiplexer, and the two paths are respectively detected by the first photodetector and the second photodetector to obtain the first electrical signal and the second electrical signal. Signal;
步骤四、第一电信号经过快速傅里叶频谱变换之后，得到振动信号真实的频率信息；第二电信号经过滑动差分处理后得到振动信号的位置信息，以此实现对振动事件的宽频感测以及事件定位。Step 4: After the first electrical signal undergoes fast Fourier spectrum transformation, the real frequency information of the vibration signal is obtained; the second electrical signal is subjected to sliding differential processing to obtain the position information of the vibration signal, so as to realize broadband sensing of vibration events and event location.
本发明采用以上技术方案与现有技术相比，具有以下技术效果：Compared with the prior art, the present invention adopts the above technical scheme, and has the following technical effects:
（1）实现对振动事件的宽频感测以及事件位置的定位；(1) Realize broadband sensing of vibration events and location of event locations;
（2）具有区分事件类型的功能。(2) It has the function of distinguishing event types.
附图说明Description of drawings
图1是本发明的系统结构图。FIG. 1 is a system structure diagram of the present invention.
图2是本发明装置及方法测得的高频振动事件的频谱响应。FIG. 2 is a spectral response of a high frequency vibration event measured by the device and method of the present invention.
图3a是普通Φ-OTDR测得锤子敲击事件的频谱图。Figure 3a is the frequency spectrum of hammer hitting events measured by common Φ-OTDR.
图3b是普通Φ-OTDR测得橡胶棒敲击事件的频谱图。Figure 3b is the frequency spectrum of the rubber stick tapping event measured by the common Φ-OTDR.
图3c是本发明装置及方法测得锤子敲击事件的频谱图。Figure 3c is a spectrum diagram of a hammer hitting event measured by the device and method of the present invention.
图3d是本发明装置及方法测得橡胶棒敲击事件的频谱图。FIG. 3d is a spectrum diagram of a rubber stick tapping event measured by the device and method of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明的技术方案做进一步的详细说明：Below in conjunction with accompanying drawing, the technical scheme of the present invention is described in further detail:
如图1所示是本发明的系统结构图，包括脉冲发生器、第一激光器、第二激光器、脉冲调制器、掺铒光纤放大器、第一波分复用器、光环行器、探测光纤、第二波分复用器、第一光电探测器、第二光电探测器和信号采集卡；其中，1 is a system structure diagram of the present invention, including a pulse generator, a first laser, a second laser, a pulse modulator, an erbium-doped fiber amplifier, a first wavelength division multiplexer, an optical circulator, a detection fiber, A second wavelength division multiplexer, a first photodetector, a second photodetector and a signal acquisition card; wherein,
脉冲发生器，用于产生调制脉冲、触发脉冲；调制脉冲输入至脉冲调制器，触发脉冲输入至信号采集卡；The pulse generator is used to generate modulation pulse and trigger pulse; the modulation pulse is input to the pulse modulator, and the trigger pulse is input to the signal acquisition card;
第一激光器，用于产生第一连续模式窄线宽激光，并将其输出至第一波分复用器；a first laser for generating a first continuous mode narrow linewidth laser and outputting it to a first wavelength division multiplexer;
第二激光器，用于产生第二连续模式窄线宽激光，并将其输出至脉冲调制器；a second laser for generating a second continuous mode narrow linewidth laser and outputting it to the pulse modulator;
脉冲调制器，用于根据接收的调制脉冲，将第二连续模式窄线宽激光转换为脉冲光输出至掺铒光纤放大器；The pulse modulator is used for converting the second continuous mode narrow linewidth laser into pulsed light according to the received modulation pulse and outputting it to the erbium-doped fiber amplifier;
掺铒光纤放大器，用于将脉冲光放大后输出至第一波分复用器；An erbium-doped fiber amplifier for amplifying the pulsed light and outputting it to the first wavelength division multiplexer;
第一波分复用器，用于将第一连续模式窄线宽激光和放大后的脉冲光通过两个不同通道进行复用，输出探测光至光环行器；a first wavelength division multiplexer, used for multiplexing the first continuous mode narrow linewidth laser and the amplified pulse light through two different channels, and outputting the probe light to the optical circulator;
光环形器，用于将探测光由其第1端口输入，并由其第2端口注入至探测光纤；Optical circulator, used to input the detection light from its first port, and inject it into the detection fiber from its second port;
探测光纤，用于将产生的背向瑞利散射光输出至光环形器的第2端口，并由光环形器的第3端口输出至第二波分复用器；The detection fiber is used for outputting the generated back-Rayleigh scattered light to the second port of the optical circulator, and from the third port of the optical circulator to the second wavelength division multiplexer;
第二波分复用器，用于将具有不同波长的背向瑞利散射光通过解复用由两个通道分别输出至第一光电探测器、第二光电探测器；The second wavelength division multiplexer is used to output the back Rayleigh scattered light with different wavelengths from two channels to the first photodetector and the second photodetector respectively through demultiplexing;
第一光电探测器，用于将接收到的光转换成第一电信号后输出至信号采集卡；a first photodetector, used for converting the received light into a first electrical signal and outputting it to the signal acquisition card;
第二光电探测器，用于将接收到的光转换成第二电信号后输出至信号采集卡；The second photodetector is used to convert the received light into a second electrical signal and output to the signal acquisition card;
信号采集卡，用于根据触发脉冲，将第一电信号、第二电信号分别转换为数字信号进行后续处理。The signal acquisition card is used to convert the first electrical signal and the second electrical signal into digital signals for subsequent processing according to the trigger pulse.
所述调制脉冲和触发脉冲的周期均与脉冲光的周期同步。The periods of the modulation pulse and the trigger pulse are both synchronized with the period of the pulsed light.
所述第一激光器和第二激光器的波长不同。The wavelengths of the first and second lasers are different.
所述第一波分复用器和第二波分复用器选用的两个波长通道需与第一激光器和第二激光器的波长相匹配。The two wavelength channels selected by the first wavelength division multiplexer and the second wavelength division multiplexer need to match the wavelengths of the first laser and the second laser.
使用器件性能：第一激光器的型号为RIO激光器，该激光器波长为1561nm，线宽为3kHz，输出光功率为5dBm；第二激光器的型号为RIO激光器，该激光器波长为1550nm，线宽为3kHz，输出光功率为9dBm；脉冲调制器选用电光调制器，可以产生最小20ns的光脉冲；EDFA选用Amonics的放大器，中心频率在1550nm，恒功率增益可以达到23dBm。第一波分复用器和第二波分复用器选择的两个通道波长为1550/1561nm。Device performance: the model of the first laser is RIO laser, the laser wavelength is 1561nm, the line width is 3kHz, and the output optical power is 5dBm; the model of the second laser is RIO laser, the laser wavelength is 1550nm, the line width is 3kHz, The output optical power is 9dBm; the electro-optical modulator is used as the pulse modulator, which can generate the minimum 20ns optical pulse; the EDFA uses the amplifier of Amonics, the center frequency is 1550nm, and the constant power gain can reach 23dBm. The wavelengths of the two channels selected by the first wavelength division multiplexer and the second wavelength division multiplexer are 1550/1561 nm.
结合实验参数的具体步骤如下：The specific steps to combine the experimental parameters are as follows:
步骤一：第一激光器产生第一连续模式窄线宽激光；Step 1: the first laser generates a first continuous mode narrow linewidth laser;
步骤二：第二激光器产生第二连续模式窄线宽激光，将第二连续模式窄线宽激光转换为脉冲光，脉冲宽度在20ns-1us；然后经过EDFA放大，放大后的脉冲光与第一连续模式窄线宽激光通过第一波分复用器复用组成探测光经过光环形器后进入探测光纤。Step 2: The second laser generates a second continuous mode narrow linewidth laser, and converts the second continuous mode narrow linewidth laser into pulsed light with a pulse width of 20ns-1us; The continuous mode narrow linewidth laser is multiplexed by the first wavelength division multiplexer to form the detection light, and then enters the detection fiber after passing through the optical circulator.
步骤三：探测光在探测光纤中产生的背向瑞利散射光经过光环行器返回到第二波分复用器，解复用出相应波长的散射光进入到第一光电探测器、第二光电探测器。Step 3: The back-Rayleigh scattered light generated by the detection light in the detection fiber is returned to the second wavelength division multiplexer through the optical circulator, and the scattered light of the corresponding wavelength is demultiplexed into the first photodetector and the second wavelength division multiplexer. Photodetector.
步骤四：第一光电探测器、第二光电探测器分别将光信号转换为第一电信号和第二电信号，后被采集卡采集处理。Step 4: The first photodetector and the second photodetector respectively convert the optical signal into a first electrical signal and a second electrical signal, which are then collected and processed by the collection card.
步骤五：第一电信号经过快速傅里叶频谱变换后可以得到振动信号真实的频率信息；第二电信号经过滑动差分处理可以得到振动信号的位置信息。因此，本发明装置及方法可以同时得到振动信号的位置信息和真实的频谱信息，实现对振动事件的宽频感测以及事件定位。实验测得的振动信号为0.1MHz、0.3MHz、0.5MHz、0.7MHz和1.0MHz的频谱响应如图2所示，系统最高可探测到频率为1MHz的振动事件。图3a是普通Φ-OTDR测得锤子敲击事件的频谱图。图3b是普通Φ-OTDR测得橡胶棒敲击事件的频谱图。图3c是本发明装置及方法测得锤子敲击事件的频谱图。图3d是本发明装置及方法测得橡胶棒敲击事件的频谱图。通过图3a—图3d的对比，可以说明普通Φ-OTDR由于采样率不够，不能捕获振动事件的完整频谱，而本发明装置及方法提高了Φ-OTDR频率感测范围，可以实现对振动事件的宽频感测，并且具有区分事件类型的能力。Step 5: The real frequency information of the vibration signal can be obtained after the first electrical signal undergoes fast Fourier spectrum transformation; the position information of the vibration signal can be obtained by the second electrical signal through sliding differential processing. Therefore, the device and method of the present invention can obtain the position information and real spectrum information of the vibration signal at the same time, so as to realize broadband sensing of vibration events and event location. The spectral responses of the vibration signals measured in the experiment are 0.1MHz, 0.3MHz, 0.5MHz, 0.7MHz and 1.0MHz as shown in Figure 2. The system can detect vibration events with a frequency of up to 1MHz. Figure 3a is the frequency spectrum of hammer hitting events measured by common Φ-OTDR. Figure 3b is the frequency spectrum of the rubber stick tapping event measured by the common Φ-OTDR. Figure 3c is a spectrum diagram of a hammer hitting event measured by the device and method of the present invention. FIG. 3d is a spectrum diagram of a rubber stick tapping event measured by the device and method of the present invention. Through the comparison of Fig. 3a-Fig. 3d, it can be explained that the common Φ-OTDR cannot capture the complete spectrum of the vibration event due to insufficient sampling rate, and the device and method of the present invention improve the Φ-OTDR frequency sensing range, can realize the vibration event. Broadband sensing and the ability to differentiate event types.
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演或替代，都应当视为属于本发明的保护范围。The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present invention.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710616363.1A CN107436175B (en) | 2017-07-26 | 2017-07-26 | Continuous distributed optical fiber vibration sensing device with broadband sensing capability and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710616363.1A CN107436175B (en) | 2017-07-26 | 2017-07-26 | Continuous distributed optical fiber vibration sensing device with broadband sensing capability and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107436175A CN107436175A (en) | 2017-12-05 |
| CN107436175B true CN107436175B (en) | 2019-05-10 |
Family
ID=60461152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710616363.1A Active CN107436175B (en) | 2017-07-26 | 2017-07-26 | Continuous distributed optical fiber vibration sensing device with broadband sensing capability and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107436175B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108548600B (en) * | 2018-03-12 | 2020-02-04 | 广东电网有限责任公司东莞供电局 | Polarization state optical fiber vibration sensing system based on time division multiplexing |
| CN108507662B (en) * | 2018-03-14 | 2021-07-09 | 中国人民解放军国防科技大学 | Optical fiber distributed sensing method and device based on multi-wavelength dual optical pulse |
| CN110595604A (en) * | 2019-09-16 | 2019-12-20 | 武汉理工大学 | High dynamic range dual wavelength distributed optical fiber vibration demodulation system and method |
| CN110806259A (en) * | 2019-11-18 | 2020-02-18 | 中国电子科技集团公司第五十四研究所 | Device for high-frequency disturbance positioning and detection of optical fiber sensing |
| CN110986814B (en) * | 2019-12-11 | 2021-10-08 | 安捷光通科技成都有限公司 | A phase-sensitive optical time-domain reflectometry system with improved dynamic strain measurement range |
| CN111289222A (en) * | 2020-01-21 | 2020-06-16 | 丽水正阳电力建设有限公司 | An optical fiber breakpoint monitoring device based on phase sensitive optical time domain reflectometry |
| CN113432630B (en) * | 2021-05-13 | 2023-02-17 | 国网河北省电力有限公司衡水供电分公司 | Distributed optical fiber sensing monitoring system |
| CN113984181A (en) * | 2021-11-01 | 2022-01-28 | 中国电子科技集团公司第三十四研究所 | Wavelength division multiplexing OTDR optical fiber vibration sensing device |
| CN117091686B (en) * | 2023-09-04 | 2024-04-09 | 江南大学 | Distributed optical fiber vibration sensor based on frequency division multiplexing |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1862239A (en) * | 2006-06-15 | 2006-11-15 | 华中科技大学 | Distributed optical fiber vibration sensing method and apparatus thereof |
| JP2008009036A (en) * | 2006-06-28 | 2008-01-17 | Osaka Prefecture Univ | Method and apparatus for evaluating effective Raman gain coefficient of single mode optical fiber transmission line |
| CN101144729A (en) * | 2007-09-30 | 2008-03-19 | 南京大学 | Brillouin Optical Time Domain Reflectometry Method Based on Fast Fourier Transform |
| CN102168953A (en) * | 2011-01-12 | 2011-08-31 | 南京大学 | Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection |
| CN102589593A (en) * | 2012-03-07 | 2012-07-18 | 杭州安远科技有限公司 | Phase sensitive type optical time domain reflection sensing system and method |
| CN102706437A (en) * | 2012-06-13 | 2012-10-03 | 扬州森斯光电科技有限公司 | Super-long distance phase-sensitive optical time domain reflectometer (Phi-OTDR) system |
| CN103644962A (en) * | 2013-12-12 | 2014-03-19 | 威海北洋电气集团股份有限公司 | Ultra long distance distributed optical fiber vibration sensing device |
| CN105758512A (en) * | 2016-05-17 | 2016-07-13 | 安徽师范大学 | Distributed optical fiber vibration sensing device with wide-frequency responses and operation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10359302B2 (en) * | 2015-12-18 | 2019-07-23 | Schlumberger Technology Corporation | Non-linear interactions with backscattered light |
-
2017
- 2017-07-26 CN CN201710616363.1A patent/CN107436175B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1862239A (en) * | 2006-06-15 | 2006-11-15 | 华中科技大学 | Distributed optical fiber vibration sensing method and apparatus thereof |
| JP2008009036A (en) * | 2006-06-28 | 2008-01-17 | Osaka Prefecture Univ | Method and apparatus for evaluating effective Raman gain coefficient of single mode optical fiber transmission line |
| CN101144729A (en) * | 2007-09-30 | 2008-03-19 | 南京大学 | Brillouin Optical Time Domain Reflectometry Method Based on Fast Fourier Transform |
| CN102168953A (en) * | 2011-01-12 | 2011-08-31 | 南京大学 | Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection |
| CN102589593A (en) * | 2012-03-07 | 2012-07-18 | 杭州安远科技有限公司 | Phase sensitive type optical time domain reflection sensing system and method |
| CN102706437A (en) * | 2012-06-13 | 2012-10-03 | 扬州森斯光电科技有限公司 | Super-long distance phase-sensitive optical time domain reflectometer (Phi-OTDR) system |
| CN103644962A (en) * | 2013-12-12 | 2014-03-19 | 威海北洋电气集团股份有限公司 | Ultra long distance distributed optical fiber vibration sensing device |
| CN105758512A (en) * | 2016-05-17 | 2016-07-13 | 安徽师范大学 | Distributed optical fiber vibration sensing device with wide-frequency responses and operation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 一种新型输电线缆风舞在线监测系统及其舞动参数测量方法;陆飙;《电力学报》;20170228;第32卷(第1期);第49-56页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107436175A (en) | 2017-12-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107436175B (en) | Continuous distributed optical fiber vibration sensing device with broadband sensing capability and method | |
| CN107101658B (en) | A fast positioning method for phase-sensitive optical time domain reflectance distributed optical fiber sensing system | |
| CN106248119B (en) | A distributed ultra-high-speed disturbance quantitative detection method and device | |
| CN107664541A (en) | A distributed optical fiber vibration and temperature fusion sensing system and method | |
| CN107917738A (en) | A kind of while measurement temperature, strain and the distributed optical fiber sensing system of vibration | |
| CN110375841B (en) | Vibration sensing method based on distributed optical fiber acoustic wave sensing system | |
| JP6308160B2 (en) | Optical fiber strain measuring device and optical fiber strain measuring method | |
| CN109540280B (en) | A signal processing method for improving the efficiency of a phase-sensitive optical time domain reflectometry system | |
| CN105806465B (en) | A novel Φ-OTDR detection device and detection method based on fixed reflection point | |
| WO2014012411A1 (en) | Botda system based on pulse coding and coherent detection | |
| CN107167168B (en) | Phase sensitive optical time domain reflection distributed optical fiber sensing system accurate positioning method | |
| CN102759371A (en) | COTDR (coherent detection based optical time-domain reflectometry) fused long-distance coherent detection brilouin optical time-domain analyzer | |
| CN104618013B (en) | A kind of related optical time domain reflectometer based on all -fiber wide range chaos light source | |
| CN106768277B (en) | A demodulation method for a distributed optical fiber vibration sensing device | |
| CN105509868A (en) | Phase-sensitive optical time domain reflectometry fiber distributed sensing system phase calculation method | |
| WO2015010581A1 (en) | Coherent optical time domain reflectometry coded based on detection frequency | |
| CN108303626B (en) | Partial discharge ultrasonic measurement system and method based on distributed optical fiber sensing array | |
| CN110487308A (en) | A kind of high-performance coherent detection type Φ-OTDR realization system and method based on PGC demodulation | |
| CN109186739B (en) | A distributed optical fiber sensing device and method with multi-spatial resolution performance | |
| CN112880711B (en) | Distributed optical fiber sensing method and system based on double pulse modulation | |
| CN110501062A (en) | A Distributed Optical Fiber Sound Sensing and Positioning System | |
| CN112697180B (en) | Fusion type distributed optical fiber sensing system and method for simultaneously measuring temperature and vibration | |
| CN103954311B (en) | Phase sensitive optical time domain reflectometer based on Brillouin amplification | |
| CN113835002A (en) | Distributed detection method and detection system for partial discharge of power cable | |
| CN108180853A (en) | A Brillouin optical time domain reflection strain detection device based on chaotic modulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |