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FBG strain transducer strain-wavelength calibrator under low-temperature liquid helium environment

A technology of strain sensor and wavelength calibration, applied in the direction of measuring device, using optical device, using optical device to transmit sensing components, etc., can solve the problems that cannot meet the requirements of FBG strain high-precision calibration experiment, and achieve simple structure and high precision high effect

Inactive Publication Date: 2007-06-06
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the defect that the existing device cannot meet the requirements of the FBG strain high-precision calibration experiment in the low-temperature liquid helium environment, and provide a device that can be used for the high-precision calibration experiment of the FBG strain sensor in the low-temperature liquid helium environment

Method used

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  • FBG strain transducer strain-wavelength calibrator under low-temperature liquid helium environment
  • FBG strain transducer strain-wavelength calibrator under low-temperature liquid helium environment
  • FBG strain transducer strain-wavelength calibrator under low-temperature liquid helium environment

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Embodiment Construction

[0023] As shown in Fig. 1, the cantilever beam 6 is fixed on the cantilever beam support platform 5, and the support platform 5 is connected to the Dewar cover 9 through a fixed tie rod 7, so that the entire device can be easily extracted.

[0024] The grating sensing part of the FBG strain sensor to be calibrated is pasted on the cantilever beam 6, and the optical fiber interface of the FBG strain sensor is connected to the inner port of the optical fiber adapter 2. The outer port of the fiber optic adapter 2 is connected to an output fiber for transmitting the light source signal and the sensing signal to the FBG demodulator. Before starting the calibration, after the entire experimental device is installed, the cryogenic solution-liquid helium is poured into the Dewar 3 through the cryogenic liquid infusion device 12 until the liquid helium covers the entire cantilever 6. After the temperature stabilizes, it can be considered that the temperature in Dewar 3 is the liquid helium...

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Abstract

This invention disclosed a FBG sensor and wavelength scaling device working in low temperature liquid helium circumstance. It consists of screw micrometer head and a cantilever dynamic platform. The characters are as follows: place the micrometer head and platform into a low temperature Dewar flask with liquid helium; a cantilever was fixed on the platform; the micrometer head was fixed on cover of the Dewar flask; one end of the head was connected to the displacement pole in the flask to form a force application device; the grating sensor of the FBG was sticked to the cantilever arm. The base and backbone of the cantilever arm were made of epoxy stuff.

Description

Technical field [0001] The invention relates to a device for calibrating an FBG strain sensor in a low-temperature liquid helium environment. Background technique [0002] Fiber Bragg Grating strain sensor has the characteristics of good reliability, anti-electromagnetic interference, electrical insulation, anti-corrosion, small size, light weight, flexibility and convenience, and can work in complex environments. There are also some obvious advantages Among other fiber optic sensors, the most important thing is that it has the unique advantage of being sensitive to wavelength but not sensitive to light intensity. This wavelength coding is a feature that other types of sensors cannot compare. [0003] But the traditional FBG strain sensor is used around room temperature. For low temperature such as liquid helium environment, whether the performance of the FBG strain sensor changes significantly and whether it will affect its usability is currently unknown. In order to carry out t...

Claims

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Application Information

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IPC IPC(8): G01B11/16G01B11/00G01D5/353G01D18/00
Inventor 邓凡平王秋良
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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