Multi-channel high-precision fiber grating sensor demodulation device

A technology of demodulation device and optical fiber grating, which is applied in the direction of converting sensor output, using optical device to transmit sensing components, measuring devices, etc., can solve the problems affecting the accuracy of wavelength demodulation and affecting the performance of optical devices, etc., to achieve large capacity and multiple Channel high-precision fiber grating demodulation, reduce the influence of wavelength nonlinearity, and improve the effect of demodulation accuracy

Active Publication Date: 2016-09-28
SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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Problems solved by technology

[0003] Although the existing fiber grating sensing system can demodulate the wavelength of the fiber grating sensor with multiple channels and high precision under normal temperature conditions, the performance of the optical device will be affected when the operating temperature changes rapidly, thereby affecting the wavelength demodulation accuracy

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  • Multi-channel high-precision fiber grating sensor demodulation device

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Embodiment Construction

[0034] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0035] The multi-channel high-precision fiber grating sensing demodulation device of the present invention, such as figure 1 As shown, it includes a high-power tunable light source, a parallel detection module, and a data processing control module. Among them: high-power tunable light source includes pump laser, coupler, TEC temperature control module, two erbium-doped fibers, two wavelength division multiplexers, optical isolator, tunable filter, gain flattening filter and filter ;Output wavelength 1525nm~1565nm, output power 20mW~40mW; Parallel detection module includes coupler, 1×N optical switch, 1×M beam splitter, etalon, TEC temperature control module, optical fiber circulator, N×1 beam combiner The device realizes the beam splitting and beam combining functions of the optical path; the data processing control module includes a signal amplification ...

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Abstract

The invention discloses a multi-channel high-precision fiber grating sensor demodulation device. The quantity of fiber grating sensor channels is increased and large-capacity multi-channel high-precision fiber grating demodulation is realized by combining an optical switch, a beam splitter and a beam combiner on the premise that the quantities of photoelectric detectors, signal amplifiers and AD acquisition channels are not increased and even reduced; the temperature of a tunable filter and an etalon is controlled via a TEC (Thermoelectric Cooler) temperature control module, thereby reducing the nonlinear influence of temperature on the output wavelength of the tunable filter and the influence of temperature on comb-like spectral line offset of the etalon, and improving the demodulation precision of the fiber grating demodulation device.

Description

technical field [0001] The invention belongs to the technical field of optical fiber grating sensing, and in particular relates to a multi-channel high-precision optical fiber grating sensor demodulation device, which can be used for demodulation of various optical fiber grating strain, temperature and acceleration sensors, and can be used in aerospace , aviation, petrochemical, civil engineering and other occasions. Background technique [0002] The fiber grating sensing system has the advantages of high sensitivity, strong anti-electromagnetic interference and strong corrosion resistance, and the measurement results of the strain sensor based on fiber grating sensing will not drift with time, and it is easy to manufacture and embed or place in spacecraft, Inside or on the surface of key structures such as aircraft, the measurement of various physical quantities such as strain, temperature and acceleration can be realized. Compared with sensor electrical sensor systems, th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35387
Inventor 张建德郭春辉申景诗石德乐邵飞吴士臣董昊
Owner SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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