Twin array Michelson optical fiber white light interference strain gage

Abstract

The invention provides a white light interferometer strain gauge of twin array Michelson optical fibers, which consists of a broad-band light source, an photodetector, a coupler, a single-mode connecting optical fiber, an optical attenuator, an optical delay line and a sensing array that is composed of twin optical fiber sensors, wherein, broad-band light emitted by the broad-band light source is split by the coupler, one light beam is transmitted into an array that consists of an arm optical fiber sensor by the optical attenuator, the other light beam is transmitted into the array that consists of another arm optical fiber sensor by the optical delay line, and light signals that are returned by the two arms are transmitted into the photodetector for detection and analysis by the coupler. The white light interferometer strain gauge of the twin array Michelson optical fibers is characterized in that the white light interferometer strain gauge can realize the measurement of strain and temperature at the same time, reduces the influence of temperature to the measurement by utilizing the temperature compensation technique, and simultaneously, simplifies system complexity, lowers testing cost, ensures the real-time property of testing and improves testing reliability; furthermore, the white light interferometer strain gauge has simple structure, easy implementation, low cost and price and easy acquisition.

Description

technical field [0001] The invention relates to a measuring device, in particular to an optical fiber interference strain gauge constructed based on the principle of space division multiplexing. Background technique [0002] Optical fiber interferometers using low-coherence and broadband light sources are usually called white light optical fiber interferometers. Compared with other optical fiber interferometers, in addition to their high sensitivity, intrinsic safety, and anti-electromagnetic Pressure, strain, temperature waiting to be measured for absolute measurement. Therefore, white light interference fiber optic interferometers are widely used in the measurement of physical quantities, mechanical quantities, environmental quantities, chemical quantities, and biomedical quantities. [0003] In recent years, white light interferometric sensing technology has developed vigorously. One of the hot spots is the development of a variety of optical fiber sensors and test syste...

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Problems solved by technology

[0009] The applicant disclosed the multiplexing optical fiber interferometer and its nesting construction method in 2006 (Chinese patent publication number: CA1963399A), invented the all-fiber interferometer optical fiber and its implementation method that can construct sensor arrays and networks, and solved the problem of optical fiber The number of multiplexed interferometers is small and the structure is complex

In the low-coherence twisted Sagnac-like optical fiber deformation sensing device disclosed by the applicant in 2007 (Chinese Patent Publication No.: 101074867A), although the interferometer structure can theoretically solve the problem of anti-destruction, but because its structure is too complicated, In particular, the optical signal has too many paths, the intensity is weak, and the signal-to-noise ratio is low, which is not conducive to the deployment and use in actual measurement

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