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Digital domain tunable distributed optical fiber sensing system and method based on chirped continuous light
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A distributed optical fiber and sensing system technology, which is applied in the direction of using optical devices to transmit sensing components, convert sensor outputs, instruments, etc., can solve the problems of the system bandwidth, the number of reusable channels, the limited number of spatial resolution, and the digital domain. , to achieve the effect of intensive frequency division multiplexing, digital domain trade-off, and sensing performance optimization
Active Publication Date: 2021-12-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0006] The purpose of the present invention is: the present invention provides a digital domain adjustable distributed optical fiber sensing system and method based on chirped continuous light, which solves the problem that the current distributed measurement system has a certain system bandwidth that is reproducible due to the existence of crosstalk between channels. The number of channels is small, and the spatial resolution limit determined by the system’s sensing bandwidth, signal-to-noise ratio and detection light characteristics, or the trade-off of the linear dynamic range of the disturbance response cannot be carried out in the digital domain after disturbance detection
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Embodiment 1
[0079] The digital domain tunable distributed optical fiber sensing system based on chirped continuous light in the embodiment of the present invention is mainly realized based on chirped continuous wave (CCW), specifically, the phase sensitive light based on chirped continuous light Realized by time domain reflectometer.
[0080] like figure 1 As shown, the digital domain tunable distributed optical fiber sensing system based on chirped continuous light provided in this embodiment includes a laser module 1, and the laser module 1 generates an optical signal to a coupler 2, and the coupler 2 is an optical coupler 2 , the coupler 2 respectively inputs the optical signal into the optical signal modulation module 3 and the signal detection module 6, the optical signal modulation module 3 modulates the optical signal into a chirped continuous optical signal, and the output terminal of the optical signal modulation module 3 Connect the port 1 of the optical circulator 4, the port ...
Embodiment 2
[0141] Embodiment 2 of the present invention is a high repetition rate digital domain tunable distributed optical fiber sensing system based on chirped continuous light with intensity cross-correlation as the disturbance demodulation mode; The time adjustment is carried out according to the following steps: Step 1: The sub-band signal E extracted by formula (13) s (t,i) perform non-matched filtering and take the intensity, namely:
[0142]
[0143]
[0144] Where abs represents the strength, and β is the non-matching coefficient.
[0145] Step 2: Put A nc (t,i) for quadratic division
[0146]
[0147] Step 3: Find the intensity local cross-correlation signal, namely
[0148]
[0149] where τ w is the size of the local cross-correlation window selected according to requirements.
[0150] Step 4: Find A' Corr (t,τ,k,i) peak corresponding time and A' Corr (t, τ, 1, i) peak value corresponds to time delay, that is
[0151] t peak (τ,k,i)=FindPeak{A' Corr (t,τ...
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Abstract
The present invention relates to the technical field of optical fiber sensing and measurement, in particular to a digital-domain tunable distributed optical fiber sensing system based on chirped continuous light and a sensing method thereof. The system includes a laser module, a coupler, an optical signal modulation module, The signal detection module, the optical circulator and the signal demodulation module, the optical signal modulation module modulates the optical signal into a periodic linear chirp continuous optical signal, and the chirp period satisfies T>2nL / c; the system uses the optical signal modulation module to generate Chirped continuous light is used as the detection light, which no longer has the spectrum broadening effect in the distributed sensing system with pulsed light as the detection light, and suppresses the crosstalk between channels, so that more channels can be multiplexed under the same system spectral bandwidth; By selecting the number of multiplexed channel divisions in the signal demodulation module in the digital domain, the measurement repetition rate is doubled, and important performance parameters such as sensing bandwidth, spatial resolution, and signal-to-noise ratio can be weighed according to the disturbance characteristics to optimize the solution. Adjust the disturbance signal.
Description
technical field [0001] The present invention relates to the technical field of optical fiber sensing and measurement, and aims to solve the problems of the existing distributed measurement system that the number of multiplexable channels in a certain system bandwidth is small due to the existence of crosstalk between channels, and the problem of system sensing bandwidth, signal-to-noise ratio and detection The problem that the spatial resolution limit determined by the optical characteristics or the trade-off of the linear dynamic range of the disturbance response cannot be performed in the digital domain after the disturbance detection, specifically involves a digital domain tunable distributed optical fiber sensing system and method based on chirped continuous light. Background technique [0002] Compared with traditional electrical sensors, fiber optic sensors have the advantages of high robustness, high flexibility, high sensitivity, anti-electromagnetic interference incl...
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