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Calibration method and system for a fiber grating demodulator

A fiber grating demodulation, fiber grating technology, applied in the direction of instruments, scientific instruments, measurement optics, etc., can solve the problems of difficult to maintain stable central wavelength, poor environmental adaptability, complex use, etc., to achieve a wide range of measured spectrum and low cost , the effect of improving accuracy

Inactive Publication Date: 2019-08-06
JILIN UNIV
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Problems solved by technology

One of the commonly used methods is to use standard fiber gratings to calibrate and calibrate. This method is simple and feasible, but fiber gratings are very sensitive to environmental changes such as external temperature, and the central wavelength is difficult to maintain stability and poor environmental adaptability; another common method is standard gas box, this method has high precision and good stability, but has the disadvantages of high cost and complicated use, and it is difficult to meet the calibration and calibration requirements of the demodulator under complex application conditions

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  • Calibration method and system for a fiber grating demodulator
  • Calibration method and system for a fiber grating demodulator
  • Calibration method and system for a fiber grating demodulator

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Embodiment Construction

[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] The invention adopts a comb filter as the measured sensor to test the demodulated wavelength, and then uses this wavelength to compare the measured data of the wavelength meter with the precision of 0.3pm, and finally obtains the precision of the demodulation instrument.

[0051] In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described i...

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Abstract

The invention discloses a fiber grating demodulator calibrating method and system. A comb filter is adopted as a detected sensor, a demodulated wavelength of the comb filter is tested, then the wavelength is compared with data detected by a wavemeter with the precision of 0.3 pm, and finally, the precision of a demodulator is obtained. By means of the fiber grating demodulator calibrating method and system, a high-precision calibration function of the fiber grating demodulator can be achieved, operation is simple, implementation is easy, and not only is the stability of wavelength calibrationimproved, but also the accuracy of calibration is improved.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a calibration method and system of a fiber grating demodulator. Background technique [0002] The research of optical fiber sensing technology began in the 1970s. Compared with traditional electrical sensors, optical fiber sensors have many advantages such as simple structure, high sensitivity, no electromagnetic interference, good electrical insulation, corrosion resistance, small size, and low cost. , has been widely used in national defense, oil pipelines, electric power and other fields. [0003] Fiber Bragg grating demodulation technology is to analyze and process the monitored signal to obtain the changes of various external parameters, so as to achieve the purpose of signal measurement. Therefore, a high-precision, high-reliability demodulation system is of great significance to the fiber grating sensing system. [0004] The fiber grating demodulator can demodulate t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D18/00G01J9/00
CPCG01D18/00G01J9/00
Inventor 张天瑜周萌穆争鸣张晓彤李振峰
Owner JILIN UNIV
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