Intensity-type optical fiber sensor optical path structure for eliminating influence of light source loss

Abstract

The invention discloses an intensity-type optical fiber sensor optical path structure for eliminating influence of light source loss, and belongs to the technical field of optical fiber grating sensing. The optical path structure is composed of a light source, transmission optical fibers 1, 2, 3 and 4, and photoelectric detectors 12 and 13. The optical path structure is further provided with a sensor chip 5 and two optical fiber couplers 7. The connection relationship of all the components are as follows: the four transmission optical fibers 1, 2, 3 and 4 are respectively arranged at the two ends of the optical fiber couplers 7, the transmission optical fiber 1 is connected with the light source, the transmission optical fiber 2 is connected with the sensor chip, and the other two transmission optical fibers 3 and 4 are respectively connected with the two photoelectric detectors 12 and 13. Compared with the prior art, the optical path structure has the following advantages: an optical fiber link of the optical path structure has no loop; the structure is simple, and the optical path structure is simplified; error caused by shaft misalignment is eliminated; consistency of optical fiber loss is guaranteed; and error introduced by the light source due to aging is avoided while light intensity interference generated by the light source due to various factors is eliminated.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an optical path structure of an intensity type optical fiber sensor that eliminates the influence of light source loss. Background technique [0002] In the contemporary society with the rapid development of science and technology, the development of optical fiber communication technology has brought about a revolution in sensing technology. In important fields; optical fiber sensing has long monitoring distance, high sensitivity, and strong environmental adaptability, especially in areas related to the national economy and people's livelihood, such as tunnel fire monitoring, dam body safety monitoring, transformers and switch cabinets in power facilities Special attention and application in the safety monitoring of power facilities such as cables and cables, and oil and gas leakage in the field of petroleum and petrochemicals. [0003] The main product...

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Problems solved by technology

[0004] However, at present, there are few enterprises and institutions researching and developing fiber gratings in China, and most of them are in the initial stage of research and development. The research and development of the optical path structure of optical fibers has not yet reached the optical path structure. The optical fiber link has no loop; the structure is simple and the optical path structure is simplified; Eliminate the error caused by inaccurate shaft alignment; ensure the consistency of fiber loss; eliminate the light intensity interference caused by various factors while avoiding the error caused by the aging of the light source

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