Optical fibre grating digital demodulation method and system based on autocorrelation principle

Abstract

The invention discloses a fiber grating digital demodulation method and system based on the autocorrelation principle. The invention solves the problems of present fiber grating sensor system demodulation technology of low measuring precision, poor real-time performance, insufficient reuse ability, high price, unsatisfied engineering practical needs, etc. The invention has the advantages of high measuring precision, fast scanning speed, good real-time performance, strong reuse ability, high performance-price ratio, strong utility, etc. The structure of the invention includes a light source and at least a fiber grating sensor. Through a coupling device, the light source is connected with the fiber grating sensors which are successively linked in series. At the same time, the coupling device also can be connected with a tunable filter, which is linked with a photoelectric detector. The photoelectric detector is successively connected with a preamplifier and a digital-analog converter. The digital-analog converter is connected with the input terminal of a digital controller. The output terminal of the digital controller is connected with the controlling input terminal of the tunable filter via an electromechanical controller and an electromechanical modulation system in turn.

Description

technical field [0001] The invention relates to a fiber grating digital demodulation method and system based on the principle of autocorrelation. Background technique [0002] Fiber Bragg grating sensor is a wavelength modulation device with compact structure and strong anti-interference ability. Machinery, medical treatment, aerospace, navigation, mining and many other fields have broad application prospects and have been greatly developed in recent years. [0003] At present, the theoretical research on fiber grating sensing has made great achievements, and the mature fiber grating manufacturing process has also enabled the fiber grating sensor to have small batch production capacity. How to reduce costs, improve demodulation and multiplexing technology, and meet engineering The requirements for high-precision applications have become an urgent problem to be solved. [0004] Since fiber grating demodulation technology is a high-resolution detection technology of fiber gr...

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Problems solved by technology

[0016] The purpose of the present invention is to solve the problems of low measurement accuracy, poor real-time performance, insufficient multiplexing ability, high price, and inability to meet the actual needs of engineering in the demodulation technology of the current fiber grating sensing system, and to provide a high measurement accuracy and fast scanning speed. , good real-time performance, strong multiplexing ability, high cost performance, and strong versatility. The fiber grating digital demodulation method and system based on the principle of autocorrelation

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