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Composite wavelength reference-based fiber bragg grating sensing demodulation device and method

A fiber grating and compound wavelength technology, which is applied in the field of temperature-stabilized fiber grating sensing and 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: 2015-09-23
TIANJIN UNIV
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  • Abstract
  • Description
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  • Application Information

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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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  • Composite wavelength reference-based fiber bragg grating sensing demodulation device and method
  • Composite wavelength reference-based fiber bragg grating sensing demodulation device and method
  • Composite wavelength reference-based fiber bragg grating sensing demodulation device and method

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Embodiment 1

[0026] Embodiment 1: Temperature stabilized fiber grating sensor demodulation device based on composite wavelength reference

[0027] 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:

[0028] 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 a power of 0.1mW~30mW;

[0029] The tunable FP filter 2 filters out narrow spectrum signals with varying wavelengths from the broadband light source by adjusting its driving voltage, thereby forming a highly stable tunable laser output. The spectrum width of the tunable FP filter is 10pm~400pm , The free spectrum range is 100nm~200nm;

[0030] The first-level fiber splitter 3 is used to split the input light according to a certain ratio, including a planar waveguide fiber splitter and a fusion tapere...

Embodiment 2

[0040] Embodiment 2: Temperature stabilized fiber grating sensor demodulation method based on composite wavelength reference

[0041] The demodulation process of the above-mentioned temperature-stabilized fiber grating sensor demodulation device based on the composite wavelength reference is as follows:

[0042] Step 1. The light emitted by the broadband light source 1 passes through a tunable FP filter 2 scanned by voltage control, and is driven by a triangular wave or sawtooth wave voltage to output a frequency sweep laser, 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 reaches the wavelength reference link;

[0043] Step 2. The light reaching the sensor link enters the optical fiber secondary beam splitter 6 and is divided into N beams. Each beam of light is sent to the fiber grating sensor array 5 through a fiber circulator 4, and the sensor array 5 senses it. The outside is to be measure...

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Abstract

The invention discloses a composite wavelength reference-based fiber bragg grating sensing demodulation device and method. The composite wavelength reference-based fiber bragg grating sensing demodulation device includes a broadband light source (1), a tunable FP filter (2), an optical fiber primary beam splitter (3), an optical fiber circulator (4), an optical fiber grating sensing array (5), a first optical fiber secondary beam splitter (61), a second optical fiber secondary beam splitter (62), an optical fiber air chamber (7), an optical fiber FP etalon (8), a notching filter (9), a photoelectric detection array (10), a data acquisition card (11) and a processing unit (12); and the composite wavelength reference-based fiber bragg grating sensing demodulation device further comprises a sensing link and a wavelength reference link. Compared with the prior art, and according to the composite wavelength reference-based fiber bragg grating sensing demodulation device and method of the invention, equal-interval reference wavelengths can be provided by the optical fiber FP etalon, and therefore, advantages of high fineness of transmission peaks, easiness in peak finding and wide wavelength coverage range can be realized; absolute reference wavelengths provided by the optical fiber air chamber are not affected by environmental factors such as temperature, vibration and impact; and stable fiber bragg grating demodulation is realized.

Description

Technical field [0001] The invention belongs to the technical field of fiber grating sensing, and particularly relates to a temperature-stabilized fiber grating sensing demodulation device and method based on a composite wavelength reference. Background technique [0002] The fiber grating sensing system is a system that uses light as the carrier and optical fiber as the medium, and uses the fiber grating sensor with the advantages of small size, light weight, corrosion resistance, strong multiplexing ability, and immunity to electromagnetic interference for sensing 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 realize 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 enviro...

Claims

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Application Information

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Patent Type & Authority Applications(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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