Fiber Bragg Grating Sensor and Fiber Bragg Grating Sensing Device
A fiber Bragg, grating sensor technology, applied in the sensing field, can solve the problem of large sensor thickness and so on
Inactive Publication Date: 2018-08-31
深圳市顺利普科技有限公司
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Problems solved by technology
[0003] The main purpose of the present invention is to provide a fiber Bragg grating sensor, which aims to solve the problem of large thickness of traditional sensors of this type
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[0012] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0013] It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0014] It should also be noted that the orientation terms such as left, right, up, and down in the embodiments of the present invention are only relative concepts or refer to the normal use state of the product, and should not be regarded as r...
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Abstract
The invention is applicable to the technical field of sensing, and provides a fiber bragg grating sensor comprising a cylindrical elastomer and a fiber bragg grating. The elastomer comprises two end surfaces which are parallel to each other and a cylindrical side surface. One end surface is used for receiving pressure and the other end surface is attached to the surface of a force-bearing object in a fit mode. The fiber bragg grating is embedded in the elastomer, and a circle coaxial with the side surface forms. The grating length of the fiber bragg grating is less than or equal to the length of the portion, embedded in the elastomer, of fiber bragg grating, and the two ends of the fiber bragg grating extend outside of the elastomer. According to the invention, the fiber bragg grating is arranged on the cylindrical elastomer to form the sensor; a relation between vertical deformation and transverse deformation is utilized; the length of the fiber bragg grating is changed through forces applied along the end surfaces of the elastomer to generate an axial strain, and as a result the longitudinal pressure is converted into transverse pressure; and the height of the elastomer is designed to be relatively small to obtain the sensor in an ultrathin structure.
Description
technical field [0001] The invention belongs to the field of sensing technology, in particular to a fiber Bragg grating sensor and a fiber Bragg grating sensing device. Background technique [0002] Most of the current various fiber Bragg grating pressure sensors (FBG) adopt some mechanical sensitization design. By applying downward pressure on the diamond-shaped cantilever beam, the fiber grating in the middle is stretched and elongated, and the incident wave passes through the inside of the fiber. The wavelength of the reflected wave reflected by the Bragg grating changes, and the pressure is determined according to the wavelength change. This structure makes the sensor thicker, which is not conducive to thinning. If the axial deformation is directly caused by longitudinal pressure so that the fiber grating changes linearly with the change of external force, it is necessary to install various elastic devices, install the optical fiber on the elastic device and arrange the...
Claims
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IPC IPC(8): G01D5/353G01L1/24G01L11/02
CPCG01D5/35316G01D5/35387G01L1/246G01L11/025
Inventor 张兴仁
Owner 深圳市顺利普科技有限公司