Demodulation Method of Long Distance Optical Delay Effect in Fiber Bragg Grating Demodulation System
A technology of fiber grating demodulation and demodulation method, which is applied in the field of fiber grating demodulation, can solve the problems of FBG central wavelength demodulation error, delay lag, etc., and achieve the effects of small environmental impact, simple operation and high calculation accuracy
Active Publication Date: 2016-03-30
WUHAN UNIV OF TECH
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Problems solved by technology
However, in the fiber Bragg grating demodulation system based on frequency-sweeping light sources, the time-consuming and time-consuming long-distance optical cable transmission and the time-consuming delay in the reception time of the reflected light at the FBG center wavelength cause the FBG wavelength position to change, which brings the FBG center wavelength demodulation band non-negligible error effects
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[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] The invention proposes a demodulation method aimed at the mediation error caused by the long-distance optical delay effect in the process of using the fiber grating demodulation system based on the frequency-sweeping light source.
[0024] The invention firstly analyzes the cause of the demodulation error generated by the fiber grating demodulation system based on the frequency-sweeping light source.
[0025] like figure 1 As shown, the FBG demodulation system based on the frequency-sweeping light source includes: a frequency-sweeping light source module, a reference channel, multiple detection channels, a signal acquisition and processing module, and a host computer software system.
[0026] The frequency-sweeping laser source in the frequency-sweeping light source module outputs light of different wavelengths as the voltage ...
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The invention relates to a method for demodulating a long distance light delayed effect in a fiber bragg grating demodulation system for removing a wavelength modulation error caused by long-distance optical cable transmission. The method disclosed by the invention comprises the following five steps: switching and demodulating the frequency sweeping rate, selecting detection channel rate, correcting a fiber bragg grating (FBG) wavelength order, calculating an FBG delayed calibration parameter, and demodulating calibration, and removing the light delayed effect, so as to obtain the real wavelength value of the FBG. By adopting the method disclosed by the invention, the integrity and the correctness of data of the fiber bragg grating demodulation system based on a frequency sweeping light source can be ensured, and the method is applicable to long-distance, large-capacity and high-speed dynamic wavelength demodulation of a fiber bragg grating sensing network which is long in distance and not obvious in distribution characteristics.
Description
technical field [0001] The invention relates to the technical field of fiber grating demodulation, in particular to a demodulation method for long-distance optical delay effects in a fiber grating demodulation system based on a frequency-sweeping light source. Background technique [0002] With the development of optical fiber sensing technology, fiber grating sensors are widely used in mechanical equipment, civil engineering, petrochemical, aerospace, medical, shipbuilding, etc. It has been widely used in the field and has become one of the fastest-growing technologies in the field of sensing. FBG (Fiber Bragg Grating, Fiber Bragg Grating) can be packaged into temperature, strain, pressure, vibration and other sensors, and is used in safety monitoring and health diagnosis fields such as bridges, dams, tunnels, port dumpers and large cranes, and petrochemical industries. In practical applications, such as online monitoring systems such as port quay cranes and dumpers, the s...
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IPC IPC(8): G01D3/028
Inventor 刘泉李政颖刘牧野赵猛
Owner WUHAN UNIV OF TECH