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Quasi-distribution optical fiber white-light strain sensing and demodulation device based on nonequilibrium Michelson interferometer

An optical fiber sensor and unbalanced technology, applied in the field of optical fiber, can solve the problems of large signal attenuation, inability to demodulate, large loss, etc., and achieve the effects of low cost, strong anti-interference and simple structure

Inactive Publication Date: 2012-08-22
HARBIN ENG UNIV
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Problems solved by technology

Otherwise, in order to match the excessively large optical path difference between the two arms of the interferometer, the scanning signal light will reflect too many times in the resonant cavity, and the loss will be too large, which will cause the signal attenuation to be too large and the amplitude to be too small to be demodulated. Application brings some trouble

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  • Quasi-distribution optical fiber white-light strain sensing and demodulation device based on nonequilibrium Michelson interferometer
  • Quasi-distribution optical fiber white-light strain sensing and demodulation device based on nonequilibrium Michelson interferometer
  • Quasi-distribution optical fiber white-light strain sensing and demodulation device based on nonequilibrium Michelson interferometer

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Embodiment Construction

[0047] The present invention will be further described below with examples in conjunction with the accompanying drawings, but the protection scope of the present invention should not be limited by this.

[0048] The scheme of distributed optical fiber white light interferometric sensor array using unbalanced Michelson interferometer to realize interrogation structure, such as Figure 7 shown. It can be seen from the figure that the distributed optical fiber white light interference sensor array is composed of an optoelectronic device 1 , an unbalanced Michelson interferometer 2 , a single-mode connecting optical fiber 3 , and a serial sensor array 4 . The optoelectronic device 1 is composed of a low-coherence broadband light source 111, a three-port circulator 121 and a photodetector 131; as Figure 5 shown. The unbalanced Michelson interferometer 2 is composed of a coated optical fiber reflection end 211, a scanning mirror 221, a self-focusing lens 231, and a 3dB optical fi...

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Abstract

The invention provides a quasi-distribution optical fiber white-light strain sensing and demodulation device based on a nonequilibrium Michelson interferometer. The device consists of a photoelectric device, a nonequilibrium Michelson interferometer, a single mode connection optical fiber and a serial optical fiber sensor array, wherein the photoelectric device consists of a broadband light source, a three-port circulator and a photoelectric detector; the nonequilibrium Michelson interferometer consists of a plated optical fiber reflection end, a scanning reflection mirror, a focusing lens and a 3dB optical fiber 2x2 coupler; and the serial optical fiber sensor array is formed by connecting optical fiber sensors in series. The device has the advantages of simple structure, convenience of use, low production cost, distributed measurement expansion, wide dynamic measurement range, high measurement precision, high anti-interference performance and the like, can sense and detect physical values such as distributed deformation, strain, temperature, pressure and the like, and can be used for monitoring intelligent structures in large sizes, and sensing a plurality of tasks, a plurality of elements, local strain and large-scale deformation.

Description

technical field [0001] The invention belongs to the field of optical fiber technology, and in particular relates to a distributed optical fiber white light interference strain sensing demodulation device for interrogating multiple sensor signals based on an unbalanced Michelson interferometer. Background technique [0002] Fiber-optic interferometers driven by low-coherence, broadband light sources such as light-emitting diodes (LEDs), superspontaneous emission sources (ASEs) or superluminescent laser diodes (SLDs) are often referred to as white-light fiber interferometers. The structure of a typical fiber optic white light interferometer is as follows: figure 1 As shown, the Michelson-type interferometer built by single-mode optical fiber uses a wide-spectrum light source LED or ASE as the light source, and realizes the measurement of the physical quantity to be measured through the white light interference fringes detected by the detector. Its working principle is as foll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26G02B6/26
Inventor 苑立波姜海丽杨军
Owner HARBIN ENG UNIV
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