Crest searching method and system

Abstract

The invention discloses a crest searching method, which comprises the following steps of: (1) performing high-speed analog / digital (A / D) sampling on a grating reflection waveform signal to acquire a group of discrete waveform data; (2) switching a current state of the system in real time according to current data and previous data of the discrete waveform data until the current state of the system is a finished state or an error state, and acquiring effective data in the discrete waveform data in the state conversion process; (3) when the current state of the system is the error state, discarding the currently sampled discrete waveform data; and (4) when the current state of the system is the finished state, performing mathematic expectation and quantile operation on the effective data toacquire a crest position value. By the method, a discrete digital signal representing displacement of a grating reflection wavelength signal can be analyzed and processed so as to obtain a high-repeatability high-stability grating demodulation result. In addition, the method comprises a step of effectively auditing the crest position value. The invention also discloses a crest searching system.

Description

technical field [0001] The invention relates to a fiber grating data transmission system, in particular to a method and system for finding wave peaks with high repeatability and stability in the fiber grating data transmission system. Background technique [0002] In recent years, the application of fiber grating technology in various industries has become more and more extensive, so the demand for grating demodulators has also expanded accordingly. [0003] The grating sensor is used to sense physical parameters such as deformation of the surface of the object caused by stress, temperature, vibration, etc., and generates optical signals (grating reflection wavelength signals) according to various physical parameters, and the change degree and speed of the wavelength signal displacement are determined by the physical parameters. Decide. [0004] The grating demodulator converts the optical signal generated by the grating sensor into an electrical signal that can be recogniz...

AI Technical Summary

Problems solved by technology

[0006] Most of the existing peak finding methods use polynomial-Gaussian formula fitting method instructions or Gaussian formula fitting method instructions. On the one hand, this method needs to have enough memory to store the data of one cycle of collection, and the instructions need to consume a lot of The command cycle not only affects the speed of wave peak search, but also limits the speed of the fiber grating data demodulation system; The existence of such interference factors will affect the local part of the wave peak, which in turn will cause fluctuations and ups and downs of the peak point, so that there will be differences in the results of multiple peak-finding for the same waveform signal, reducing the repeatability and stability of the grating demodulator

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