Wavelength and Temperature Adaptive Segment Fitting Method for High Precision Fiber Bragg Grating Sensor
A grating sensor, segmented fitting technology, applied to thermometers, thermometers, instruments and other directions with physical/chemical changes, can solve the problems of low accuracy and segmental point accuracy, and achieve simple and fast algorithms and improve temperature measurement accuracy. Effect
Active Publication Date: 2018-05-18
BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to solve the problem of low accuracy caused by coarse error points in the existing wavelength temperature fitting method and the accuracy problem caused by the dependence of segmentation points on manual experience
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[0020] The high-precision adaptive FBG wavelength-temperature fitting method of the present invention will be described in detail below with reference to the accompanying drawings, but the description is only exemplary and not intended to limit the protection scope of the present invention.
[0021] like figure 1 As shown, the adaptive FBG wavelength temperature fitting method steps of the present invention are as follows:
[0022] 1) Enter step 101 to obtain the original wavelength array λ [i] , i∈[0,N-1] and the corresponding temperature array T [i] ,i∈[0,N-1]. Enter step 102 then, the wavelength temperature data pair (λ [i] ,T [i] ) is arranged in ascending order of wavelength to get a new wavelength and temperature array λ [j] ,j∈[0,N-1] and T [j] ,j∈[0,N-1];
[0023] 2) enter step 201, utilize least square method to wavelength temperature data λ [j] and T [j] Perform polynomial fitting to obtain the fitting result of wavelength and temperature where M is the se...
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The invention discloses a high-precision FBG wavelength-temperature self-adaptive segmentation fitting method. In the method, the wavelength-temperature data pairs are first arranged in ascending order of wavelength; After the judgment, a new wavelength array and corresponding temperature array are obtained; by calculating the vertical distance of the point line, the point with the largest vertical distance from the straight line is used as the segment point, and the obtained data is processed in a loop until all data segments fit residual The difference is less than the set residual threshold. This method has the characteristics of simple and fast algorithm and high fitting accuracy. It can adaptively determine the segmentation point according to the set fitting error and polynomial function form, and gives the specific expression of each segmentation function, which solves the problem of extreme environments. High-precision self-adaptive piecewise fitting of FBG wavelength and temperature.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a high-precision adaptive fiber grating sensor wavelength and temperature fitting method. Background technique [0002] With the continuous improvement of my country's spacecraft model development requirements, there is an urgent need to measure the temperature and strain of the spacecraft and monitor the thermal deformation of the structure in real time under the simulated space vacuum thermal environment on the ground. Optical fiber multi-parameter composite sensing technology can meet the requirements of vacuum thermal test applications for the entire star and its large exposed structural parts (such as mesh antennas, truss structures, solar wings, robotic arms, etc.). Fiber Bragg Grating (FBG) sensor is currently a research hotspot in the field of fiber optic sensors, and it is also the most extensive and most marketable fiber optic sensor in sensor ...
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IPC IPC(8): G01K11/32G01K11/3206
CPCG01K11/32
Inventor 张景川杨晓宁王晶裴一飞谢吉慧张立伟尹晓芳钱北行
Owner BEIJING INST OF SPACECRAFT ENVIRONMENT ENG