Method and system for improving measurement speed of distributed optical fiber sensing by using orthogonal signals
A distributed optical fiber and orthogonal signal technology, which is applied to devices using optical methods, optical devices to transmit sensing components, measuring devices, etc., can solve the problem of increasing the bandwidth of the received signal, reducing the spatial resolution, and reducing the signal-to-noise of the received signal Ratio and other problems to achieve a good general effect
Active Publication Date: 2019-08-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0004] The purpose of the present invention is to solve the technical problem of increasing the bandwidth of the received signal, reducing the signal-to-noise ratio of the received signal or reducing the spatial resolution while improving the measurement speed in the existing distributed optical fiber sensing system; Method and system for improving measurement speed of distributed optical fiber sensing by traffic signal
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[0051] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0052] Such as figure 1 As shown, a distributed optical fiber sensing system based on orthogonal signals includes an orthogonal optical pulse signal generation unit: used to send out a periodically repeated orthogonal optical pulse sequence; a signal test optical circuit unit: used to combine N The alternating light pulse sequence is injected into the optical fiber to be tested sequentially, the scattered light signal is collected, and the local oscillator light and the scattered light signal are demodulated and converted into a digital signal; the signal processing unit is used to extract each sig...
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The invention discloses a method and a system for improving the measurement speed of distributed optical fiber sensing by utilizing orthogonal signals, belonging to the field of optical fiber sensing, and solving the existing method for improving the measurement speed of a distributed optical fiber sensing system, which can increase the bandwidth of received signals and reduce the reception rate. The signal-to-noise ratio of the signal or technical issues that reduce the spatial resolution. The invention specifically sends out N orthogonal optical pulse sequences that are repeated periodically; the N orthogonal optical pulse sequences are sequentially inserted into the optical fiber to be measured, the scattered light signal is collected, and the local oscillator light and the scattered light signal are demodulated and converted. The measurement speed of distributed optical fiber sensing can be improved by extracting the scattering information of each orthogonal optical pulse from the collected digital signal and arranging them in the order in which they are inserted into the optical fiber to be measured. N‑1 times the purpose. The invention is used to improve the measurement speed of the optical fiber sensing system.
Description
technical field [0001] A method and system for improving the measurement speed of distributed optical fiber sensing by utilizing orthogonal signals are used to increase the sensing speed of measuring optical fiber, and belong to the field of optical fiber sensing. Background technique [0002] The distributed optical fiber sensing system belongs to the long-distance detection system. Measurement speed is an important parameter for distributed fiber optic sensing (DOFS) systems. In most DOFS systems, it is usually necessary to send a pulse and locate the target by the reception time of the pulse reflected (scattered) light. In order to prevent misjudgment, in general, the pulse repetition rate (f scan ) and the length of the measuring fiber (L) need to satisfy f scan <2nL / c, where c is the propagation speed of light in vacuum and n is the refractive index of the fiber. Therefore, the longer the measurement distance, the smaller the repetition rate of the pulse, and the...
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IPC IPC(8): G01D5/353
CPCG01D5/353G01D5/35358G01P3/36G01D5/35335G01D5/268
Inventor 王子南熊吉谢联莲饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA