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Constant-temperature constant-strain type fiber bragg grating standard device

A fiber grating and standard device technology, applied in the direction of instruments, etc., can solve the problems that the optical fiber grating sensor demodulator cannot be calibrated, and the changing mode is different, so as to achieve the effect of eliminating wavelength drift and eliminating influencing factors

Pending Publication Date: 2020-03-31
NANKAI UNIV
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  • Abstract
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Problems solved by technology

However, in most methods, the light source and the light mode in the detection module change synchronously, and the changing modes are different, so it is impossible to calibrate the fiber grating sensor demodulator through a unified method

Method used

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  • Constant-temperature constant-strain type fiber bragg grating standard device

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Embodiment approach

[0012] Such as figure 1 As shown, the constant temperature constant strain type optical fiber grating standard device provided by the present invention includes: optical fiber grating (1), fixed sleeve (2), incident flange, outgoing flange, temperature control substrate (3), semiconductor refrigeration sheet, thermistor and control circuit. The fiber grating 1 is fixed in the fixing sleeve 2, and the fixing sleeve 2 mainly plays the role of protecting the optical fiber and isolating strain, so that the fiber grating (1) works under a constant strain condition. The fixed sleeve (2), the thermistor and the semiconductor refrigeration sheet are fixed on the temperature control substrate (3). The resistance value of the thermistor changes with the temperature, and the temperature information is fed back to the control circuit, and the control circuit adjusts the semiconductor cooling chip to heat up and cool down accordingly, so that the surface temperature on the temperature con...

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Abstract

The invention discloses a constant-temperature constant-strain type fiber bragg grating standard device, and belongs to the technical field of optical fiber sensing. The fiber bragg grating is placedin a constant-temperature constant-strain environment, influence factors of wavelength drift are eliminated, and the fiber bragg grating with the stable center wavelength is obtained. The fiber bragggrating sensing demodulator directly measures the central wavelength of the fiber bragg grating, and the precision of the demodulator can be detected and the demodulator can be calibrated by comparingthe measurement reading with the actual wavelength. The device is suitable for calibrating the demodulator adopting various demodulation methods, and has good compatibility.

Description

technical field [0001] The design of the invention belongs to the technical field of optical fiber grating sensing and detection, and in particular relates to a constant temperature and constant strain type optical fiber grating standard device. Background technique [0002] Fiber Bragg grating sensor is a wavelength modulation sensor. By monitoring the change of the center wavelength of fiber Bragg grating, it plays an important role in the field of multi-parameter detection such as temperature, pressure, stress and strain, displacement and acceleration. [0003] As a signal detection device, the fiber grating sensor demodulator has different detection methods, detection speed, detection accuracy and so on. Fiber Bragg grating sensing demodulation methods mainly include edge filtering method, matched filtering method, tunable filtering method, light source wavelength tunable scanning method, radio frequency detection method, grating chirp method, CCD spectrometer method, in...

Claims

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Application Information

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IPC IPC(8): G01D18/00
CPCG01D18/00
Inventor 王槿邓志超叶青黄宁宁田建国
Owner NANKAI UNIV
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