Coding technique for improving detection performance of distributed fiber sensor and application thereof

Abstract

The invention discloses a coding technique for improving the detection performance of a distributed fiber sensor and an application thereof. A coding matrix has the following characteristics: (1) the quadratic sum of all elements of the inverse matrix of the coding matrix is minimal; (2) the elements of the coding matrix comprise a plurality of unit levels of N, N-1, N-2,...0, wherein the N is not less than 2; and (3) relation between the order number N*N of the coding matrix and the pulse length L of pump light is N=2(L-1). Compared with the distributed fiber sensing equipment without adopting coding or with adopting an original coding mode, the invention greatly improves the detection sensitivity and the signal-to-noise ratio, can shorten the coding length, reduce the sending times of the coded pump light and obtain higher coding gain. The invention can be applied to different distributed fiber sensors, can highly and sensitively monitor parameters such as temperature or pressure and the like, and has wide application value in the fields of petrochemical industry, aerospace, geological engineering, geotechnical engineering, traffic, power and the like.

Description

technical field [0001] The present invention relates to an optical sensor, especially in the field of distributed optical fiber sensing utilizing a novel encoding technique to improve detection performance. Background technique [0002] Compared with conventional sensing technology, optical fiber sensing has many excellent properties such as anti-electromagnetic interference and atomic radiation, light weight, small size, insulation, high temperature resistance, corrosion resistance, etc., and is more and more favored by special occasions or harsh environment applications . Distributed optical fiber sensing technology was developed in the late 1970s with the emergence of Optical Time Domain Reflectometry (OTDR), which is still widely used in optical fiber engineering. In the last ten years or so, a series of new distributed optical fiber sensing mechanisms and measurement systems have emerged, which have the ability to simultaneously obtain the measured distribution informa...

AI Technical Summary

Problems solved by technology

[0003] Several key technical problems in the distributed optical fiber sensing system include: (1) The measurement accuracy and spatial resolution of the system generally have a mutual restrictive relationship; (2) The detection signal is generally weak, so the signal processing system is required to have a high (3) Since a large number of signal averaging, frequency scanning, phase tracking and other processing are required in the detection process, it takes a long time to achieve a complete measurement

[0005] However, the detection performance (signal-to-noise ratio) of these technologies is not high, and there is still a long way to go before practical application.

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