Linear chirp optical fiber grating based two-dimensional stress sensor

A technology of stress sensor and optical fiber grating, which is applied in the direction of using optical device to transmit sensing components, fluid pressure measurement using optical method, instruments, etc., to achieve the effects of wide application, easy system integration, and simple structure

Inactive Publication Date: 2005-08-17
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The search results show that among the known optical fiber sensors, there is no fiber grating two-dimensional stress (displacement) sensor that adopts a uniform cantilever beam structure and uses a single linear chirped fiber grating for two-dimensional real-time sensing of parameters such as stress and displacement.

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  • Linear chirp optical fiber grating based two-dimensional stress sensor
  • Linear chirp optical fiber grating based two-dimensional stress sensor
  • Linear chirp optical fiber grating based two-dimensional stress sensor

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Embodiment Construction

[0013] The present invention is described in detail below in conjunction with accompanying drawing:

[0014] This two-dimensional stress sensor based on linear chirped fiber grating includes linear chirped fiber grating, optical fiber, cantilever beam, fixed end, optical fiber connector, optical fiber coupler, matching liquid, light source, wavelength tester, O / E A circuit, a data processor, and a display; it is characterized in that: the sensor fiber grating 1 is pasted on the surface of the cantilever beam 3 near the fixed end with an adhesive, so that the grating area is just all attached to the surface of the beam, and the grating is in contact with the surface. Line, that is, the intersection line between the neutral plane of the cantilever beam and the surface is at a certain angle;

[0015] There are two connection methods:

[0016] Reflective connection, that is, the two ports on one side of the fiber coupler 10, one end is connected to the pasted linear chirped fiber...

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Abstract

This invention relates to a fiber transducer including a linear chirp fiber grating, fibers and a display, among which, the sensing elementary linear chip fiber grating is adhered to the surface of a cantilever with bonder, the connection of the fiber grating is in two ways: one is reflection, the other is transmission. The reflection spectrum of the applied sensing element-linear chirp fiber grating is several or more than ten nanometers in width. Advantage: the sensing element of the sensor is a linear chip fiber grating for sensing stress, displacement and its direction at any time.

Description

technical field [0001] The present invention relates to an optical fiber sensor, especially a two-dimensional stress (displacement) sensor based on a linear chirped grating that can perform two-dimensional, high-precision real-time monitoring and measurement of parameters such as stress and displacement, and its structure and sensing method and applications. Background technique [0002] Fiber Bragg Grating is a new type of photonic device, which is a spatially periodic refractive index distribution established in the optical fiber, which can change and control the propagation behavior of light in the optical fiber. Among them, the linear chirped grating is a kind of non-uniform fiber grating, and its grating period changes monotonously, continuously and linearly along the axis of the fiber core. A linear chirped grating can be regarded as a plurality of grating cells connected with different grating periods, and each grating cell selectively reflects light of different wav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02G01D5/353G01L1/24G01L11/02
Inventor 张伟刚董孝义开桂云金龙刘波涂勤昌袁树忠刘艳格
Owner NANKAI UNIV
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