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

A strain sensor and wavelength calibration technology, which is applied to measurement devices, optical devices, and optical devices to transmit sensing components, etc., can solve problems such as the inability to meet the requirements of FBG strain high-precision calibration experiments, and achieve simple structure and high precision. high effect

Inactive Publication Date: 2009-06-03
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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

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Embodiment Construction

[0023] like figure 1 As shown, 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 the fixed tie rod 7, so that the whole device can be extracted conveniently.

[0024] The grating sensing part of the FBG strain sensor that needs 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 optical fiber adapter 2 is connected with an outgoing optical fiber for transmitting the light source signal and the sensing signal to the FBG demodulator. Before starting the calibration, after the installation of the entire experimental device is completed, the low-temperature solution—liquid helium is poured into the Dewar 3 through the low-temperature liquid perfusion device 12 until the liquid helium covers the entire cantilever beam 6 . After the temperature is ...

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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 a FBG strain sensor in a low-temperature liquid helium environment. Background technique [0002] Fiber Bragg Grating (Fiber Bragg Grating) strain sensor has the characteristics of good reliability, anti-electromagnetic interference, electrical insulation, corrosion resistance, small size, light weight, flexibility and convenience, and can work in complex environments. In place of 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 encoding is a characteristic that other types of sensors cannot compare with. [0003] But the traditional FBG strain sensor is used around room temperature. For low temperature such as liquid helium environment, it is still unknown whether the performance of FBG strain sensor will change greatly and whether it will affect its usability. In order to car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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