Unlock instant, AI-driven research and patent intelligence for your innovation.

Singe lnog period optical fiber gratings based simultaneous temperature and load measuring method and sensor

A measurement sensor and fiber grating technology, applied in the field of methods and measurement sensors, can solve problems such as temperature cross-sensitivity, and achieve the effects of small additional loss, small size, and wide application prospects

Inactive Publication Date: 2004-02-04
CHONGQING UNIV
View PDF1 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method and sensor are expected to completely solve the problem of cross-sensitivity between load and temperature in engineering measurement, and overcome the shortcomings of existing simultaneous temperature and load measurement techniques that require multiple sensors or need to solve complex matrix equations

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Singe lnog period optical fiber gratings based simultaneous temperature and load measuring method and sensor
  • Singe lnog period optical fiber gratings based simultaneous temperature and load measuring method and sensor
  • Singe lnog period optical fiber gratings based simultaneous temperature and load measuring method and sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] First of all, the long-period fiber grating we choose is a high-frequency CO 2 A new type of long-period fiber grating written in a hydrogen-loaded single-mode fiber by laser pulses. The structure of the long-period fiber grating is as follows figure 1 As shown, 1-1 in the figure is a long-period fiber grating, 1-2 is a cladding, and 1-3 is a fiber core. The period Λ of the long-period fiber grating is 450 μm, the number of periods N is 55, the resonant wavelength is 1530.82 nm in a free state, and the resonant peak amplitude is -25.075 dB. The least sensitive part of LPFG to lateral load is figure 2 The device shown was tested. The device uses a broadband light source 2-1 as an input, and uses a spectrum analyzer 2-8 to measure changes in the transmission spectrum of the grating. Turning the turntable 2-6 can drive the long-period fiber grating 2-2 to rotate along the fiber axis so as to measure the lateral load characteristics in different circumferential directio...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention can obtain the variation of load and temperature by using spectrum analyser to measure variation of grating transmission spectrum to obtain variation of resonant wavelength and amplitude value at long period optical fibre grating based on the characteristic that the resonant wavelength of long period optical fibre grating written in with high-frequency CO2 laser pulse is not sensitive to cross direction load and resonant peak amplitude value is not sensitive to temperature, but the wavelength is varied in linear as following with temperature and peak amplitude value is with load. To stick or bury it at engineering structure, as its wavelength is faced to load.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, and in particular relates to a method and a measurement sensor for simultaneously measuring temperature and load based on a single long-period optical fiber grating. Background technique [0002] In the state-of-health monitoring of smart materials and engineered structures, the accuracy of lateral load measurement is often affected by the cross-sensitivity between load and temperature due to changes in ambient temperature. Load measurement errors due to temperature changes can be corrected by measuring temperature, so simultaneous load and temperature sensing technology is a very active research area at present. H.J.Patrick and others published a paper (J.IEEE Photon.Tech.Lett., 1996, Vol.8, No.9, pp.1223-1225) proposed a strain and temperature measurement scheme simultaneously, but this scheme requires fiber Bragg grating and The combination of long-period fiber gratings results ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01B11/16G01K11/32G02B6/124
Inventor 饶云江王义平
Owner CHONGQING UNIV