High-performance distributed optical fiber sensing system and method

A technology of distributed optical fiber and sensing system, which is applied in the direction of using optical devices to transmit sensing components, etc., can solve problems such as difficulty in ensuring accurate pulse delay intervals, reducing system flexibility, and low performance, so as to increase the optical power entering the fiber, Avoid non-linear effects, reduce required effects

Pending Publication Date: 2021-05-07
冉曾令
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing distributed optical fiber sensing system needs a plurality of lasers with different wavelengths, the cost is high, but the performance is not high, and the use of optical fiber delay lines also has relatively large disadvantages. One is to use different The length of the optical fiber for pulse delay requires precise control of the length of the fiber, and it is difficult to ensure the accuracy of the pulse delay interval. The second is that the use of optical fiber to delay optical pulses limits the pulse delay time on the hardware and reduces the flexibility of the system.

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  • High-performance distributed optical fiber sensing system and method

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Embodiment 1

[0048] Such as Figure 1 to Figure 3 As shown, a high-performance distributed optical fiber sensing system of the present invention includes: a multi-wavelength narrow-linewidth light source, a modulation unit, a splitter, a wavelength division multiplexer, a wavelength division multiplexer, a circulator, a transmission Sensing optical fiber, demodulation module and host computer, etc.;

[0049] The multi-wavelength narrow-linewidth light source emits continuous light comprising n wavelengths (the multi-wavelength narrow-linewidth light source simultaneously emits a wavelength of λ 1 , lambda 2 ,...,λ n continuous light), which is divided into two paths by the first splitter, one path is used as reference light, and the other path is used as signal light, which is asynchronously modulated at each wavelength by the modulation unit to be probe light;

[0050] The input end of the modulation unit is connected to the multi-wavelength narrow linewidth light source, and the outpu...

Embodiment 2

[0069] Such as Figure 1 to Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides a high-performance distributed optical fiber sensing method, which is applied to a high-performance distributed optical fiber sensing method described in Embodiment 1. sensing system; the method comprises the following steps:

[0070] S1. The multi-wavelength narrow-linewidth light source emits continuous light containing multiple wavelengths, which is divided into two paths by a splitter, one path is used as reference light, and the other path is used as signal light to asynchronously modulate each wavelength into probe light through the modulation unit;

[0071] S2. The detection light is divided into m-path detection light through the splitter, and the m-path detection light enters the m-path sensing fiber connected to the second port of the circulator through the first port of the circulator;

[0072] S3. Probe light propagates in the sen...

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Abstract

The invention discloses a high-performance distributed optical fiber sensing system and method. The system comprises a multi-wavelength narrow linewidth light source, a modulation unit, a splitter, a wavelength division multiplexer, a wavelength division demultiplexer, a circulator, a sensing optical fiber, a demodulation module and an upper computer. The continuous light emitted by the multi-wavelength narrow-linewidth laser is modulated by using the sweep-frequency filter or the multi-path signal generator, asynchronous modulation among wavelengths is realized by controlling the sweep-frequency rate of the sweep-frequency filter or the multi-path signal generator to trigger the modulator in a parallel time delay manner, and the pulse interval, the pulse width and the pulse repetition frequency are flexible and adjustable. And the demultiplexer and the wavelength division multiplexer are utilized to realize multi-channel synchronous sensing, so that the measurement efficiency is improved. Pulse light with multiple wavelengths is used as detection light to enter a sensing optical fiber, information carried by Rayleigh scattering signals under each wavelength is demodulated, and the signals are comprehensively processed. According to the invention, system complexity is reduced, and system performance is improved.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensing systems, in particular to a high-performance distributed optical fiber sensing system and method. Background technique [0002] After decades of vigorous development, optical fiber sensing technology has been successfully applied in many fields, such as structural health monitoring, oil and gas exploration and other fields. In the distributed optical fiber sensing system, the optical fiber can not only be used as the transmission medium of the optical fiber, but also when the light propagates in the optical fiber, the characteristic parameters (amplitude, phase, polarization state, wavelength, etc.) that characterize the light wave are affected by external factors (such as temperature, pressure, magnetic field, electric field, displacement, etc.), the demodulation module demodulates the external effect. [0003] According to different measurement methods, optical fiber s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/36
CPCG01D5/36
Inventor 冉曾令肖彦波
Owner 冉曾令
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