Differential motion type optical acceleration meter for achieving laser beat frequency based on fiber bragg optical grating reflection spectrum features
A Bragg grating and reflection spectrum technology, applied in the field of inertial navigation, can solve the problems of mutual interference of detection and control signals, insufficient detection accuracy, etc., and achieve the effects of avoiding light intensity fluctuation interference, good repeatability, and uniform deformation
Active Publication Date: 2017-05-17
BEIHANG UNIV
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[0005] The purpose of the present invention is to solve the problems of insufficient detection accuracy and mutual interference between detection and control signals in the capacitive accelerometer test method at the present stage, and propose a differential optical accelerometer based on the reflection spectrum characteristics of the fiber Bragg grating to realize laser beat frequency , with simple structure, high sensitivity, digital output and strong anti-interference ability
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[0026] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.
[0027] The invention is a differential optical accelerometer that realizes laser beat frequency based on the reflection spectrum characteristics of fiber Bragg gratings, such as figure 1 , figure 2 As shown, it includes a narrow linewidth fiber DBR laser source 1, a first polarization maintaining fiber 3dB coupler 2, a second polarization maintaining fiber 3dB coupler 3, a third polarization maintaining fiber 3dB coupler 4, a beam combining coupler 5, and a second polarization maintaining fiber 3dB coupler 4. A fiber Bragg grating (FBG) 6, a second fiber Bragg grating (FBG) 7, a first secondary cantilever 8, a second secondary cantilever 9, a main cantilever 10, a proof mass 11, a light source driver 12, and a fourth polarization maintaining beam Fiber 3dB coupler 13, fifth polarization-maintaining fiber 3dB coupler 14, first frequency modulation de...
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The invention discloses a differential motion type optical acceleration meter for achieving laser beat frequency based on fiber bragg optical grating reflection spectrum features. The optical acceleration meter comprises a narrow linewidth fiber DBR laser light source, a polarization maintaining fiber 3dB coupler, a beam combining coupler, a fiber bragg optical grating, an auxiliary cantilever beam, a main cantilever beam, a mass block, a light source driver, a frequency modulation device, a wave detection device, a phase position modulation device, a modulation signal generating device, a photoelectric detector, a wave detection circuit and a frame. The optical acceleration meter is high in anti-interference ability; through the digital output features, all kinds of light intensity scintillation interferences can be fundamentally avoided; optical signals are used as information carriers, so effects on acceleration measurement precision imposed by electromagnetic interferences can be effectively reduced; and the optical acceleration meter is highly reliable and stable.
Description
technical field [0001] The invention relates to a differential optical accelerometer which realizes laser beat frequency based on the reflection spectrum characteristic of an optical fiber Bragg grating, and belongs to the technical field of inertial navigation. Background technique [0002] Fiber Bragg grating uses the photosensitivity of fiber material to form a spatial phase grating in the fiber core, and its function is essentially to form a narrow-band (transmission or reflection) filter or mirror in the fiber core. Fiber Bragg grating (fiber bragggrating, FBG) is a short-period fiber grating with a period less than 1 μm, which is characterized by coupling between two core modes with opposite transmission directions, and belongs to the reflection bandpass filter. [0003] According to the Bragg equation of FBG, the Bragg wavelength depends on the grating period and the effective refractive index of the reverse coupling mode. The external factors that can cause them to ...
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Login to View More IPC IPC(8): G01P15/03
CPCG01P15/032
Inventor 冯丽爽焦洪臣张宇张天航
Owner BEIHANG UNIV