Stress sensing device based on hybrid cascaded optical fiber interferometer, and demodulation method

A fiber optic interferometer, hybrid cascade technology, applied in fluid pressure measurement using optical methods, measurement devices, measurement of force by measuring the change of optical properties of materials when they are stressed, etc. The FP cavity fabrication process is cumbersome and other issues, to achieve the effects of high sensitivity, low cost, and simple preparation

Inactive Publication Date: 2019-10-15
陕西高速公路工程咨询有限公司 +1
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  • Abstract
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Problems solved by technology

[0010] However, the manufacturing process of the FP cavity used in the above sensors is cumbersome
In addition, there are few reports on stress sensors utilizing the optical vernier effect

Method used

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  • Stress sensing device based on hybrid cascaded optical fiber interferometer, and demodulation method
  • Stress sensing device based on hybrid cascaded optical fiber interferometer, and demodulation method
  • Stress sensing device based on hybrid cascaded optical fiber interferometer, and demodulation method

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Embodiment Construction

[0032] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0033] It should be noted that the terminology used herein is only for describing specific embodiments, and is not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0034] Implementation example one

[0035] Most of the sensors based on the optical vernier effect in the past are temperature...

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Abstract

The invention discloses a stress sensing device based on a hybrid cascaded optical fiber interferometer, and a demodulation method. The stress sensing device comprises a broadband light source, a Sagnac interferometer, an optical fiber mode interferometer, and a signal processing unit which are connected in order; the optical fiber mode interferometer is composed of an incident single-mode opticalfiber, a few-mode optical fiber, and an emitting single-mode optical fiber; the Sagnac interferometer is used as a reference interferometer, the optical fiber model interferometer is used as a sensing interferometer, and the optical Vernier effect is realized by cascading the Sagnac interferometer and the optical fiber model interferometer; the envelope numerical value change of the hybrid cascaded optical fiber interferometer is observed through the signal processing unit, thereby realizing the sensing demodulation. The influence on the sensor by the tiny airflow and micro-vibration and likeexternal perturbation can be avoided by utilizing the polarization unsensitive characteristic of the few-mode optical fiber; the sensing demodulation is realized by observing the envelope numerical value change of the hybrid cascaded optical fiber interferometer by utilizing the optical Vernier effect. And the sensing device has the features of being simple in preparation, low in cost and high insensitivity.

Description

technical field [0001] The present disclosure relates to the technical field of optical fiber sensing, in particular to a stress sensing device and a demodulation method based on a hybrid cascaded optical fiber interferometer. Background technique [0002] In the fields of perimeter security and building condition monitoring, fiber optic sensors play a role that cannot be underestimated. Real-time measurement of physical quantities such as temperature, stress, and magnetic field can be realized by observing changes in optical signal intensity, phase, or wavelength. It has the characteristics of high sensitivity, anti-electromagnetic interference, and reusability. [0003] Among the existing patents, CN201810417535.7 proposes a temperature crack sensor based on few-mode fiber and fiber Bragg grating, which reads the change of external parameters to be measured through spectral drift, but the sensitivity achieved by this sensor cannot meet the requirements of ultra-high sensit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24G01L11/02
CPCG01L1/242G01L11/025
Inventor 樊见维宁提纲张峰张传彪胡光明常晓娟
Owner 陕西高速公路工程咨询有限公司
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