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Monitoring method for LPFG (Long Period Fiber Grating) transverse load direction characteristic

A technology of lateral load and linear segment, which is applied in the measurement of the change force of the optical properties of the material when it is stressed, can solve the problems of large electromagnetic interference, achieve strong anti-electromagnetic interference, simplify the structure, and overcome the light source. The effect of stabilizing influence

Inactive Publication Date: 2012-09-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of the original LPFG lateral load monitoring, which are easily affected by environmental parameters such as temperature and relatively large electromagnetic interference, and provide a method for monitoring LPFG lateral loads with high sensitivity and less susceptible to interference

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  • Monitoring method for LPFG (Long Period Fiber Grating) transverse load direction characteristic
  • Monitoring method for LPFG (Long Period Fiber Grating) transverse load direction characteristic
  • Monitoring method for LPFG (Long Period Fiber Grating) transverse load direction characteristic

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Embodiment Construction

[0043] Depend on figure 1 It can be seen that the specific composition of the long-period fiber grating lateral load sensing system of the present invention is that a broadband light source 1 (LG150 type broadband light source can be used), enters the input end of the transmission fiber 2, and propagates to the long-period fiber grating lateral load sensing probe 4. It interacts with the lateral load generated by the loading device 3 in the environment to be tested to produce a coupling effect between the core and the cladding, and the transmitted light enters the spectrometer 5 (AQ6317 spectrometer can be used), and then processed by the computer 6 to output the reflected light intensity and light intensity. The relationship curve between the peaks, thus realizing the full optical fiber of the entire measurement optical path.

[0044] figure 2 It is a schematic diagram of the long-period fiber grating transverse loading experimental device. It includes a broadband light so...

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Abstract

The invention relates to a monitoring method for LPFG (Long Period Fiber Grating) transverse load direction characteristic based on resonance amplitude modulation and an asphalt pavement pressure sensor, belonging to the field of optical sensing testing. The method comprises the following steps of: (1) demarcating a linear area of long cycle fiber Bragg grating resonance peak amplitude and transverse load relation curve; (2) during the transverse load monitoring, selecting the linear sections of all external loading varying ranges falling in the liner area, selecting the angle corresponding to the linear section of the highest sensitivity in the linear section according with the condition as a thrust surface; (3) using the characteristics of the long cycle fiber Bragg grating resonance peak amplitude and the transverse load relation to process pressure monitoring. The method is high in sensitivity and is not easy to be disturbed.

Description

technical field [0001] The invention relates to a method for monitoring lateral load sensitivity characteristics of long-period optical fiber gratings written in ultraviolet light based on resonance peak amplitude modulation and an asphalt pavement pressure sensor based on lateral load characteristics, belonging to the field of civil engineering sensor testing. Background technique [0002] Long-period fiber grating (hereinafter referred to as LPFG) is a sensing grating based on the coupling theory of core guided mode and cladding mode. Its sensing principle is to make the fiber When the phase matching condition is satisfied, resonant coupling will be generated, so that the light of a certain frequency band in the light wave is coupled into the cladding layer and lost, so as to detect the medium parameters. [0003] LPFG is very sensitive to changes in the lateral load it is subjected to, and then the magnitude of the lateral load force in the surrounding environment can be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/24
Inventor 刘宏月曾捷梁大开周怡妃叶婷孙玮
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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