White light interference sensing system

Abstract

The invention relates to a white light interference sensing system. The technical scheme includes that the white light interference sensing system comprises a white light source, two photoelectric detectors, an optical fiber coupler, and a sensing optical fiber. The optical fiber coupler is a multi-port optical fiber coupler, the port quantity of each side is no smaller than two, and the port quantity of at least one side is larger than two. The white light source and the two photoelectric detectors are connected to the same side of the optical fiber coupler respectively, and two ends of the sensing optical fiber are connected respectively with two ports on the other side of the optical fiber coupler so as to form an optical closed circuit. The white light interference sensing system solves the problem of insufficiency and instability of interference signals caused by birefringence phenomenon generated random in the optical fiber in the existing interference system, and has the advantages that the interference signals are stable and the system is not influenced by environmental factors.

Description

technical field [0001] The invention relates to optical fiber sensing technology, in particular to a measurement system for optical fiber interference signals. Background technique [0002] The invention is mainly based on the principle of optical interference. In the optical fiber interference system, two beams of light from the same laser source propagating in forward and reverse directions form interference in the same optical fiber, that is, in an optical closed circuit. When the optical closed loop is disturbed by the outside world, the optical path along the positive and negative directions will be affected. Although the two beams are affected equally, the time it takes for this effect to reach the detector is different. The interference light intensity measured on the detector will be affected, causing a corresponding change in response. [0003] Taking the traditional optical closed loop interference ring as an example, such as figure 1 As shown, the light emitte...

AI Technical Summary

Problems solved by technology

This will make the system unable to work stably and reliably

[0011] The above problems are unavoidable problems in all optical fiber systems that apply the interference principle; these factors will cause a series of problems such as instability of optical fiber interference signals, deterioration of signal-to-noise ratio, and increased false alarm rate and false alarm rate of the system.

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