Fiber Bragg Grating Sensing Demodulation Device and Method Based on Composite Wavelength Reference

A fiber grating and composite wavelength technology, which is used in the field of temperature-stabilized fiber grating sensing demodulation devices, can solve the problem that the transmission wavelength is not completely stable, and achieve the effects of reducing the difficulty of extraction, high precision, and easy peak finding.

Active Publication Date: 2017-08-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to external factors such as temperature, vibration, and its own creep characteristics, the transmission wavelength of the fiber optic FP etalon is not completely stable, and will drift with the change of the environment and the passage of time

Method used

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  • Fiber Bragg Grating Sensing Demodulation Device and Method Based on Composite Wavelength Reference
  • Fiber Bragg Grating Sensing Demodulation Device and Method Based on Composite Wavelength Reference
  • Fiber Bragg Grating Sensing Demodulation Device and Method Based on Composite Wavelength Reference

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Embodiment 1

[0022] Example 1: Temperature-stabilized fiber grating sensing and demodulation device based on composite wavelength reference

[0023] Such as figure 1 As shown, the temperature-stabilized fiber grating demodulation device based on the composite wavelength reference provided by the present invention includes 12 parts:

[0024] Broadband light source 1, which provides wide-spectrum light for the system, including C-band ASE light source, C+L-band ASE light source and SLD light source, with power ranging from 0.1mW to 30mW;

[0025] Tunable FP filter 2, through the adjustment of its driving voltage, filters the narrow spectrum signal with wavelength change from the broadband light source, thus forming a highly stable tunable laser output. The spectral width of the tunable FP filter is between 10pm and 400pm , the free spectrum ranges from 100nm to 200nm;

[0026] Optical fiber primary beam splitter 3, used to split the input light according to a certain ratio, including plana...

Embodiment 2

[0036] Embodiment 2: Temperature-stabilized fiber grating sensing demodulation method based on composite wavelength reference

[0037] The demodulation process of the temperature-stabilized fiber grating sensing demodulation device based on the composite wavelength reference is as follows:

[0038] Step 1. The light emitted by the broadband light source 1 passes through a tunable FP filter 2 controlled by the voltage to scan, and outputs a frequency-sweeping laser under the drive of a triangular wave or sawtooth wave voltage, and is divided into two parts by the optical fiber primary beam splitter 3. Part of the light reaches the sensing link, and the other part of the light reaches the wavelength reference link;

[0039] Step 2. The light arriving at the sensing link enters the optical fiber secondary beam splitter 6 and is divided into N beams. Each beam passes through a fiber circulator 4 to send the frequency-sweeping laser to the fiber Bragg grating sensing array 5, and t...

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Abstract

The invention discloses a fiber grating sensing demodulation device based on a composite wavelength reference, comprising a broadband light source (1), a tunable FP filter (2), an optical fiber primary beam splitter (3), an optical fiber circulator (4 ), fiber grating sensing array (5), first optical fiber secondary beam splitter (61) and second optical fiber secondary beam splitter (62), optical fiber gas chamber (7), optical fiber FP etalon (8), A notch filter (9), a photodetector array (10), a data acquisition card (11) and a processing unit (12); including a sensing link and a wavelength reference link. Compared with the prior art, the present invention combines the advantages of the optical fiber FP etalon as an equidistant reference wavelength with high transmission peak precision, easy peak finding, and wide wavelength coverage, and the absolute reference wavelength provided by the optical fiber gas cell is not affected by temperature, Advantages of vibration, impact and other environmental factors; realize temperature stable fiber grating demodulation.

Description

technical field [0001] The invention belongs to the technical field of fiber grating sensing, and in particular relates to a temperature-stabilized fiber grating sensing demodulation device and method based on a composite wavelength reference. Background technique [0002] Fiber Bragg Grating sensing system is a system that uses light as the carrier and optical fiber as the medium, and uses fiber Bragg grating sensors with the advantages of small size, light weight, corrosion resistance, strong multiplexing ability, and no electromagnetic interference for sensing and measurement. When the fiber grating sensor is subjected to physical parameters such as stress and strain, vibration, temperature and pressure, the wavelength of the Bragg light returned by the sensor will move to achieve sensing. Compared with traditional electrical sensing systems, this technology has the characteristics of wide measurement range, high precision and high resolution, and has advantages in harsh ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353G01D5/38
Inventor 刘铁根江俊峰何盼刘琨王双闫金玲
Owner TIANJIN UNIV
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