Brillouin optical time domain reflectometer for single-photon detection based on edged filter method

An optical time domain reflectometer and single-photon detection technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problem of weak back Brillouin scattering signal detection ability is limited, it is difficult to realize temperature and strain simultaneous sensing, It is difficult to obtain Brillouin frequency shift information and other problems, to achieve the effect of solving spatial resolution and measurement accuracy, improving spatial resolution and measurement accuracy, and small post-pulse effect

Inactive Publication Date: 2012-08-01
NANJING FAAIBO OPTOELECTRONICS TECH
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Problems solved by technology

[0005] Although BOTDR has the advantage of convenient single-ended access, it is difficult to detect due to the weak intensity of self-published Liouin scattered light.
Traditional BOTDR uses analog detectors (ordinary photodetectors). Due to the limitation of equivalent noise power (NEP) and bandwidth, analog detectors have limited ability to detect weak back Brillouin scattering signals. Therefore, based on The BOTDR of the analog detector is difficult to achieve the measurement of large dynamic range, high measurement accuracy and spatial resolution at the same time
The self-published Rieouin scattering signal is weak, and the single-photon detector has high detection sensitivity. Therefore, using a single-photon detector as a detection unit will help to improve the performance of the BOTDR system, but it has not been found that the single-photon detector has been applied to BOTDR. related literature and patents
[0006] In addition, although the application of single photon detectors in BOTDR systems can break through the limitations of the sensitivity and bandwidth of traditional detectors, single photon detectors generally can only detect the intensity of Brillouin scattered light, and it is difficult to obtain Brillouin frequency shift information. Simultaneous sensing of temperature and strain

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  • Brillouin optical time domain reflectometer for single-photon detection based on edged filter method
  • Brillouin optical time domain reflectometer for single-photon detection based on edged filter method
  • Brillouin optical time domain reflectometer for single-photon detection based on edged filter method

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Embodiment 1

[0054] This embodiment provides a single-photon detection Brillouin optical time domain reflectometer based on an edge filtering method. like figure 1 As shown, the narrow linewidth laser 1 emits continuous light, which is modulated into optical pulses by the pulse modulator 2 controlled by the pulse signal generator 11, and the optical pulses are coupled into the sensing fiber 4 through the circulator 3, and scattered by the sensing fiber The backscattered light is filtered by the optical filter module 5 to obtain the back-Brillouin scattering signal after filtering the back-Rayleigh scattering signal. / The detector 1 in the InP SPAD detector group 8 detects the Brillouin scattered light, and the second path passes through the linear edge filter 7 and then the detector 2 in the InGaAs / InP SPAD detector group 8 detects the Brillouin scattered light of this path. Scattered light, and finally the data processing module 10 uses the time-correlated single-photon counting techniq...

Embodiment 2

[0061]This embodiment provides another single-photon detection Brillouin optical time-domain reflectometer based on the edge filtering method, the structure of which is as follows image 3 shown, with figure 1 Compared with the reflectometer of the structure, the difference is that the optical filter module 5 is required to be able to separate the back Rayleigh scattered light and the back Brillouin scattered light, and the InGaAs / InP-SAPD detector group 8 contains three InGaAs / InGaAs / The InP-SAPD detector can simultaneously detect Rayleigh scattered light and Brillouin scattered light. After the optical filter module 5 separates the back Rayleigh scattered light and the Brillouin scattered light, the back Brillouin scattered light is divided into two paths by the 3dB coupler 6, and one path is directly connected to the detector in the InGaAs / InP SPAD detector group 8. 1 detect the light intensity I 1 , the other path is detected by the detector 2 in the InGaAs / InP SPAD det...

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Abstract

The invention discloses a Brillouin optical time domain reflectometer for single-photon detection based on an edged filter method, which comprises a narrow linewidth laser (1), a pulse modulator (2), a circulator (3), a sensing optical fiber (4), an optical fiber module (5), 3dB coupler (6), a linear edged filter (7), an InGaAs/InP SPAD (single-photon avalanche diode) detector group (8), a signal generator (9), a data processing module (10) and a pulse signal generator (11), wherein the InGaAs/InP SPAD detector group (8) includes two or three InGaAs/InP SPAD detectors. The InGaAs/InP SPAD detector group with a high counting rate and high sensitivity is used as a detection unit, Brillouin frequency shift information is acquired by the edged filter method, time correlation single-photon counting technology is adopted by the data processing module (10), limitations on the bandwidth and sensitivity of a traditional detector are broken through, spatial resolution and measuring precision of the reflectometer can be simultaneously improved, and temperature and strain are simultaneously sensed.

Description

technical field [0001] The invention relates to a single-photon detection Brillouin optical time-domain reflectometer based on an edge filtering method, in particular to an InGaAs / InP SPAD (single photon avalanche diode, single-photon avalanche diode) detector for detecting Brillouin optical time-domain Reflectometer, mainly used in the field of optical fiber sensor technology. Background technique [0002] Distributed optical fiber sensing technology has the ability to simultaneously obtain the distribution information of the measurand that changes with time and space in the sensing fiber area, and has a wide range of applications. Distributed temperature sensors are widely used in temperature distribution measurement of large power equipment and oil wells, fire protection and alarm systems in large warehouses, oil depots, mines and tunnels; distributed stress sensors can be used in bridges, dams and other facilities. Safety detection, aviation , aerospace vehicles and oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01B11/16G01K11/322
Inventor 张旭苹胡君辉李存磊张益昕
Owner NANJING FAAIBO OPTOELECTRONICS TECH
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