Fiber Bragg grating demodulating system based on volume holographic grating

Abstract

The invention discloses a fiber Bragg grating demodulating system based on a volume holographic grating and relates to the technical field of fiber Bragg grating sensors. The fiber Bragg grating demodulating system comprises a broadband light source, a fiber Bragg grating, an optical fiber coupler, an optical fiber collimator, an optical fiber collimating lens, the volume holographic grating, a lens, a photoelectric detector, a signal processing system, a wireless transmitting device and a wireless receiving device. The fiber Bragg grating demodulating system based on the volume holographic grating has the advantages that a holographic grating demodulating system in the fiber Bragg grating demodulating system is simple, and a sensor has passive characteristics; the fiber Bragg grating demodulating system is high in anti-electromagnetic interference, light and insulated, has chemical properties of resistance to water, high temperature and corrosion and is capable of adequately providing precise monitoring data in severe environments.

Description

technical field [0001] The invention relates to the technical field of fiber grating sensing, in particular to a fiber grating demodulation system based on a volume holographic grating. Background technique [0002] With the maturity of fiber grating manufacturing technology, fiber gratings are gradually applied in the field of sensing. Compared with other sensors, fiber grating sensors have the advantages of small size, light weight, high sensitivity, high accuracy, flexibility and convenience, strong anti-electromagnetic interference ability, strong corrosion resistance, high temperature resistance, etc., and can be widely used in monitoring strain, Physical quantities such as temperature, crack, displacement, vibration, stress, etc. Therefore, fiber gratings are paid more and more attention by researchers. [0003] The monitoring principle of fiber grating is because the center wavelength of fiber grating changes with the change of temperature and stress, so if the drif...

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Problems solved by technology

[0004] The existing fiber grating demodulator is usually based on the principle of tunable Fabry-Perot filter, but because the piezoelectric body in the tuned Fabry-Perot filter of its core device has hysteresis and creep, hysteresis Insufficiency and other shortcomings, resulting in poor real-time measurement and drift between measurement results and actual values

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