Multi-wavelength optical fiber sensor based on Fabry-Perot cavity
An optical fiber sensor, multi-wavelength technology, applied in the direction of using optical devices to transmit sensing components, instruments, scientific instruments, etc., can solve the problems of expensive high-speed spectral equipment, limit the upper limit of vibration frequency measurement, etc., to eliminate measurement errors, eliminate Interfere, eliminate the effect of strong light background
Inactive Publication Date: 2011-04-06
XIAMEN UNIV
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[0003] In recent years, Fabry-Perot cavity interference sensors based on wavelength detection have also appeared [2] Jiang Yi, Tang Caijie edited. Principle and application of fiber optic Fabry-Perot interferometer. Beijing: National Defense Industry Press 2009.214-221; [3 ] Yu Qingxu et al. Application research of optical fiber F-P cavity pressure sensor in high temperature oil well [J] Optoelectronic Laser, 2007, 183: 299-302, can overcome the vibration of light transmission path to a certain extent, but these methods use spectrometer And similar equipment as the source of wavelength signals, on the one hand, limits the upper limit of vibration frequency measurement, on the other hand, high-speed spectroscopic equipment is expensive
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[0020] The following embodiments will further illustrate the present invention in conjunction with the drawings.
[0021] in figure 1 In, the laser beam emitted by the semiconductor laser 1 enters the optical fiber after being collimated and focused, and the wave function of each wavelength is E n =acos(w n t+δ n ), enter the Fabry-Perot cavity sensing head 3 through the optical fiber broadband coupler 2. Coherent light figure 2 Fresnel reflection occurs at the interface 41, and total reflection occurs at the interface 42. The two reflected lights are superimposed on the interface 41, and the expression is E n =Eb n +Ei n , Where Ei n =ηE n cos(k n z) represents the interference part of the reflected light, z is the amount of cavity length change, η is determined by the coupling efficiency, interference contrast, and cavity length loss, k n Mainly determined by the wavelength, Eb n It is the part where no interference occurs. When the external environment pressure, temperature, a...
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The invention discloses a multi-wavelength optical fiber sensor based on a Fabry-Perot cavity and relates to the optical fiber sensor. The invention provides the multi-wavelength optical fiber sensor based on the Fabry-Perot cavity, which can overcome environmental vibration, realize high-speed real-time measurement, significantly simplify the structure of the sensor and reduce the cost of the sensor, and is provided with a multi-wavelength narrow-band coherent light source, an optical fiber wide-band coupler, an F-P (Fabry-Perot) cavity type sensing head, a photoelectric receiver with narrow-band filtering and an amplifying circuit. The multi-wavelength narrow-band coherent light source is coupled by at least two narrow-band light sources, the optical fiber wide-band coupler is connected with the multi-wavelength narrow-band light source, the optical signal output end of the optical fiber wide-band coupler is connected with the F-P cavity type sensing head, reflected light of the F-P cavity type sensing head is sent to the photoelectric receiver with the narrow-band filtering, and the input end of the amplifying circuit is connected with the output end of the photoelectric receiver with the narrow-band filtering.
Description
Technical field [0001] The invention relates to an optical fiber sensor, in particular to a multi-wavelength optical fiber sensor based on a Fabry-Perot cavity. Background technique [0002] The laser fiber sensor based on the Fabry-Perot cavity not only has the advantages of simple structure, high accuracy, and fast measurement speed, but also has real-time processing capabilities. It is widely used in various vibration measurement, displacement measurement, temperature measurement and other aspects. The traditional single-wavelength Fabry-Perot cavity interferometric sensor is in actual application due to the influence of environmental vibration, which causes the transmitted light intensity to change, which causes the sensor to fail and seriously affects the measurement effect. Please refer to the Chinese Patent Publication No. CN1490598. [0003] In recent years, Fabry-Perot cavity interferometer sensors based on wavelength detection have also appeared [2] Jiang Yi, Tang Caijie....
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IPC IPC(8): G01D5/353G01L1/24G01K11/32G01H9/00
Inventor 林春黄元庆王磊
Owner XIAMEN UNIV
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