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Sensor structure for simultaneously measuring temperature and strain of long period fiber gratings (LPFGs)

A fiber grating, long-period technology, applied in the field of sensor structure, can solve the problems of inconvenient processing and high sensor cost

Active Publication Date: 2011-08-24
饶云江
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Problems solved by technology

The optical grating strain and temperature simultaneous measurement sensor proposed by Li Aiqun et al. (ZL 200910026403) encapsulates two fiber gratings in a special structure, resulting in high sensor cost and inconvenient processing

Method used

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  • Sensor structure for simultaneously measuring temperature and strain of long period fiber gratings (LPFGs)
  • Sensor structure for simultaneously measuring temperature and strain of long period fiber gratings (LPFGs)
  • Sensor structure for simultaneously measuring temperature and strain of long period fiber gratings (LPFGs)

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Embodiment Construction

[0027] The present invention will be described in further detail below according to the embodiments and the accompanying drawings.

[0028] Such as Figure 1-8 As shown, the long-period fiber grating we choose is two long-period fiber gratings with different periods written on Corning's bending-resistant optical fiber with high-frequency CO2 laser pulses. The pair of long period fiber grating structures such as figure 1 shown. In the figure, LPFG 1 and LPFG 2 are two LPFGs with different periods.

[0029] The period of a long-period fiber grating is 470 μm, the period number N=60, and the resonant peak wavelength is at 1536.5nm. The grating strain characteristics of this period are as follows: image 3 As shown, its resonance peak basically does not shift under 1500 microstrains; the temperature characteristic curve is as follows Figure 4 As shown, its temperature sensitivity is about 0.098nm / ℃, and its linearity is R 2 = 0.998.

[0030] The 2 period of long period fibe...

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Abstract

The invention provides a sensor structure for simultaneously measuring the temperature and strain of long period fiber gratings (LPFGs). The sensor structure is characterized in that a pair of LPFGs which are written by high-frequency CO2 laser pulse in a fiber and have different periods are selected, namely an LPFG only sensitive to temperature variation and an LPFG sensitive to both temperaturevariation and strain variation; and the respective variation of the temperature and the strain can be accurately measured by cascading the two LPFGs. The sensor structure has the following prominent advantages: the temperature variation is measured by using the LPFG which has a specific period and is only sensitive to temperature variation, and the variation of the temperature and the strain is measured by using the other LPFG, thus realizing measurement of the two parameters (the temperature and the strain), and providing a scheme for solving the problem of cross sensitivity of the temperature and the strain; and meanwhile, the sensor has the capability of normally working at the high temperature of 750 DEG C and is unnecessary to be specially packaged.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a sensor structure using a pair of long-period optical fiber gratings with different periods as sensors to simultaneously measure two parameters of temperature and strain. Background technique [0002] Long-period fiber grating (LPFG) is a band-stop fiber filter that can couple light of a specific wavelength to the cladding. Its resonant wavelength will change with changes in the temperature, strain, and refractive index of the external environment. , according to this principle, the measurement of the change of the physical quantity of the external environment can be realized by measuring the change of the resonant wavelength of the LPFG. Because LPFG is more sensitive to changes in many external physical quantities than Fiber Bragg Grating (FBG), and LPFG can withstand higher temperatures, so it has great application prospects in fiber optic sensing. ...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01B11/16G01D5/32G01K11/3206
Inventor 饶云江汪文华汤伟锋
Owner 饶云江
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