CN-224216100-U - Signal processing device integrating DAS and BOTDR

CN224216100UCN 224216100 UCN224216100 UCN 224216100UCN-224216100-U

Abstract

The utility model relates to the technical field of optical fiber sensing, in particular to a signal processing device integrating DAS and BOTDR, which comprises a signal transmitting module, a signal frequency shifting module, a signal transmission module, a BOTDR optical signal processing module, a DAS optical signal processing module and a signal processing module, wherein the signal transmitting module respectively transmits continuous optical signals to the signal frequency shifting module, the BOTDR and the DAS optical signal processing module through three output ends, the signal frequency shifting module converts the continuous optical signals into linear sweep pulse light, the signal transmission module outputs the linear sweep pulse light to an optical fiber to be detected and acquires scattered light, the scattered light is respectively transmitted to the two optical signal processing modules for processing, and the processed signals are transmitted to the signal processing module for analysis. Compared with the prior art, the utility model can effectively separate the returned scattered light by converting the continuous light emitted into the optical fiber to be detected into the linear sweep pulse light, thereby realizing simultaneous monitoring of vibration, temperature and stress.

Inventors

YUE ZHIPENG
CAI SHUFENG
DENG LINBO
OU XIUPING
CAI JUN

Assignees

高勘(广州)技术有限公司

Dates

Publication Date: 20260508
Application Date: 20250530

Claims (10)

1. The signal processing device integrating the DAS and the BOTDR is characterized by comprising a signal transmitting module, a signal frequency shifting module, a signal transmission module, a BOTDR optical signal processing module, a DAS optical signal processing module and a signal processing module; The first output end of the signal transmitting module is connected with the first input end of the signal frequency shifting module, the second output end of the signal transmitting module is connected with the first input end of the BOTDR optical signal processing module, and the third output end of the signal transmitting module is connected with the first input end of the DAS optical signal processing module; The output end of the signal frequency shifting module is connected with the input end of the signal transmission module, the second input end of the signal frequency shifting module is connected with the output end of the signal processing module, and the signal frequency shifting module is used for receiving continuous optical signals and converting the continuous optical signals into linear sweep frequency pulse light for output; The first output end of the signal transmission module is used for being connected with an optical fiber to be tested, the second output end of the signal transmission module is connected with the second input end of the BOTDR optical signal processing module, and the third output end of the signal transmission module is connected with the second input end of the DAS optical signal processing module; The output end of the BOTDR optical signal processing module is connected with the first input end of the signal processing module, and the output end of the DAS optical signal processing module is connected with the second input end of the signal processing module.
2. The DAS and BOTDR fused signal processing device of claim 1, wherein the signal frequency shifting module includes an acousto-optic frequency shifter, a power amplifier, and a direct digital synthesizer; The first input end of the acousto-optic frequency shifter is connected with the first output end of the signal transmitting module, and the output end of the acousto-optic frequency shifter is connected with the input end of the signal transmitting module; The output end of the power amplifier is connected with the second input end of the acousto-optic frequency shifter, the input end of the power amplifier is connected with the output end of the direct digital synthesizer, and the input end of the direct digital synthesizer is connected with the output end of the signal processing module.
3. The DAS and BOTDR fused signal processing apparatus of claim 1, wherein said BOTDR optical signal processing module includes a first balanced detector, a microwave balun, and a microwave amplifying assembly; The first input end of the first balance detector is connected with the second output end of the signal transmission module, and the second input end of the first balance detector is connected with the second output end of the signal transmission module; The first input end of the microwave balun is connected with the first output end of the first balance detector, the second input end of the microwave balun is connected with the second output end of the first balance detector, and the output end of the microwave balun is connected with the input end of the microwave amplifying assembly; The output end of the microwave amplifying assembly is connected with the first input end of the signal processing module.
4. The DAS and BOTDR fused signal processing device of claim 3, wherein the microwave amplifying assembly includes a microwave low noise amplifier, a microwave band pass filter, a microwave down-conversion circuit, an intermediate frequency band pass filter, an intermediate frequency amplifier, and a first variable gain amplifier connected in sequence; The input end of the microwave low-noise amplifier is connected with the output end of the microwave balun, and the output end of the first variable gain amplifier is connected with the first input end of the signal processing module.
5. The DAS and BOTDR fused signal processing device of claim 1, wherein the DAS optical signal processing module includes a second balanced detector, a radio frequency balun, and a radio frequency amplification assembly; The first input end of the second balance detector is connected with the third output end of the signal transmission module, and the second input end of the second balance detector is connected with the third output end of the signal transmission module; The first input end of the radio frequency balun is connected with the first output end of the second balance detector, the second input end of the radio frequency balun is connected with the second output end of the second balance detector, and the output end of the radio frequency balun is connected with the input end of the radio frequency amplifying assembly; the output end of the radio frequency amplification assembly is connected with the second input end of the signal processing module.
6. The DAS and BOTDR fused signal processing device of claim 5, wherein the rf amplifying assembly includes an rf low noise amplifier, an rf band pass filter, and a second variable gain amplifier connected in sequence; The input end of the radio frequency low noise amplifier is connected with the output end of the radio frequency balun, and the output end of the second variable gain amplifier is connected with the second input end of the signal processing module.
7. The DAS and BOTDR combined signal processing apparatus according to any one of claims 1-6, wherein the signal processing module comprises an analog-to-digital converter and a signal processing unit; The first input end of the analog-to-digital converter is connected with the output end of the BOTDR optical signal processing module, the second input end of the analog-to-digital converter is connected with the output end of the DAS optical signal processing module, the output end of the analog-to-digital converter is connected with the input end of the signal processing unit, and the output end of the signal processing unit is connected with the second input end of the signal frequency shifting module.
8. The DAS and BOTDR fused signal processing apparatus according to any one of claims 1-6, wherein said signal transmitting module comprises a laser transmitting unit and a first coupler; The laser emission unit is used for emitting continuous optical signals, the output end of the laser emission unit is connected with the input end of a first coupler, the first output end of the first coupler is connected with the first input end of the signal frequency shifting module, the second output end of the first coupler is connected with the first input end of the BOTDR optical signal processing module, and the third output end of the first coupler is connected with the first input end of the DAS optical signal processing module.
9. The DAS and BOTDR combined signal processing device of any one of claims 1-6, wherein the signal transmission module comprises an circulator, a first optical amplifying assembly, and a second optical amplifying assembly; The input end of the first optical amplification assembly is connected with the output end of the signal frequency shift module, the output end of the first optical amplification assembly is connected with the first transmission end of the circulator, the second transmission end of the circulator is used for being connected with the optical fiber to be tested, the third transmission end of the circulator is connected with the input end of the second optical amplification assembly, the first output end of the second optical amplification assembly is connected with the second input end of the BOTDR optical signal processing module, and the second output end of the second optical amplification assembly is connected with the second input end of the DAS optical signal processing module.
10. The DAS and BOTDR fused signal processing apparatus of claim 9, wherein the first optical amplifying assembly includes a first erbium-doped fiber amplifier and a first optical filter connected in sequence, an input end of the first erbium-doped fiber amplifier being connected to an output end of the signal frequency shifting module, an output end of the first optical filter being connected to a first transmission end of the circulator; The second optical amplifying assembly comprises a second erbium-doped optical fiber amplifier, a second optical filter and a second coupler which are sequentially connected, wherein the input end of the second erbium-doped optical fiber amplifier is connected with the third transmission end of the circulator, the first output end of the second coupler is connected with the second input end of the BOTDR optical signal processing module, and the second output end of the second coupler is connected with the second input end of the DAS optical signal processing module.

Description

Signal processing device integrating DAS and BOTDR Technical Field The utility model relates to the technical field of optical fiber sensing, in particular to a signal processing device integrating DAS and BOTDR. Background The existing DAS (Distributed Acoustic Sensing, distributed optical fiber acoustic wave sensing technology) and BOTDR (Brillouin Optical Time Domain Reflectometry, brillouin optical time domain reflectometer) devices can only realize separate functions, for example, the DAS device can only support vibration and sound monitoring, the BOTDR device can only support measuring temperature and stress, so that in a scene where vibration, temperature and stress need to be measured simultaneously, two devices need to be deployed simultaneously, and the two devices need to work alternately, so that the same fiber core cannot be accessed to realize simultaneous monitoring. Disclosure of utility model The present utility model is directed to overcoming at least one of the above-mentioned drawbacks (shortcomings) of the prior art, and providing a signal processing apparatus that integrates DAS and BOTDR, and simultaneously monitors vibration, temperature and stress by means of one optical fiber. The technical scheme adopted by the utility model is as follows: The utility model provides a signal processing device integrating DAS and BOTDR, which comprises a signal transmitting module, a signal frequency shifting module, a signal transmission module, a BOTDR optical signal processing module, a DAS optical signal processing module and a signal processing module; The first output end of the signal transmitting module is connected with the first input end of the signal frequency shifting module, the second output end of the signal transmitting module is connected with the first input end of the BOTDR optical signal processing module, and the third output end of the signal transmitting module is connected with the first input end of the DAS optical signal processing module; The output end of the signal frequency shifting module is connected with the input end of the signal transmission module, the second input end of the signal frequency shifting module is connected with the output end of the signal processing module, and the signal frequency shifting module is used for receiving continuous optical signals and converting the continuous optical signals into linear sweep frequency pulse light for output; The first output end of the signal transmission module is used for being connected with an optical fiber to be tested, the second output end of the signal transmission module is connected with the second input end of the BOTDR optical signal processing module, and the third output end of the signal transmission module is connected with the second input end of the DAS optical signal processing module; The output end of the BOTDR optical signal processing module is connected with the first input end of the signal processing module, and the output end of the DAS optical signal processing module is connected with the second input end of the signal processing module. Optionally, the signal frequency shift module comprises an acousto-optic frequency shifter, a power amplifier and a direct digital synthesizer; The first input end of the acousto-optic frequency shifter is connected with the first output end of the signal transmitting module, and the output end of the acousto-optic frequency shifter is connected with the input end of the signal transmitting module; The output end of the power amplifier is connected with the second input end of the acousto-optic frequency shifter, the input end of the power amplifier is connected with the output end of the direct digital synthesizer, and the input end of the direct digital synthesizer is connected with the output end of the signal processing module. Optionally, the microwave amplifying assembly comprises a microwave low-noise amplifier, a microwave band-pass filter, a microwave down-conversion circuit, an intermediate frequency band-pass filter, an intermediate frequency amplifier and a first variable gain amplifier which are connected in sequence; The input end of the microwave low-noise amplifier is connected with the output end of the microwave balun, and the output end of the first variable gain amplifier is connected with the first input end of the signal processing module. Optionally, the DAS optical signal processing module comprises a second balanced detector, a radio frequency balun and a radio frequency amplifying assembly; The first input end of the second balance detector is connected with the third output end of the signal transmission module, and the second input end of the second balance detector is connected with the third output end of the signal transmission module; The first input end of the radio frequency balun is connected with the first output end of the second balance detector, the second input end of the radio frequency balun is connected with