Secondary frequency signal detection technology-based resonant fiber optic gyroscope light source intensity modulation noise inhibition method and device
A technology of fiber optic gyroscope and light source intensity, which is applied in the field of optical sensing and signal detection
Inactive Publication Date: 2016-09-28
ZHEJIANG UNIV
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[0004] The invention aims at the problem of the intensity modulation noise of the semiconductor laser in the existing resonant fiber optic gyroscope system, and proposes a method and device for suppressing the intensity modulation noise of the resonant fiber optic gyroscope light source based on the secondary frequency signal detection technology
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[0024] The present invention will be described in detail below in conjunction with the embodiments and accompanying drawings, but the present invention is not limited thereto.
[0025] Such as figure 1As shown, the structure of the resonant fiber optic gyroscope light source intensity modulation noise suppression based on the secondary frequency signal detection technology includes a tunable semiconductor laser 1, an isolator 2, a 50% coupler 3, a first phase modulator 4, a second Phase modulator 5, first signal source 6, second signal source 7, input 95% coupler 8, fiber ring resonator 9, output 95% coupler 10, first photodetector 11, A first lock-in amplifier 12 , a frequency servo loop 13 , a third lock-in amplifier 14 , a third signal source 15 , a second photodetector 16 , a second lock-in amplifier 17 and an intensity compensation algorithm module 18 . The tunable semiconductor laser 1 is connected to the isolator 2, the isolator 2 is connected to the 50% coupler 3, the...
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The invention discloses a secondary frequency signal detection technology-based resonant fiber optic gyroscope light source intensity modulation noise inhibition method and device. The device comprises a tunable semiconductor laser, an isolator, a 50% coupler, a first path phase modulator, a second path phase modulator, a first path signal source, a second path signal source, an input end 95% coupler, an optical fiber ring resonator, an output end 95% coupler, a first path photoelectric detector, a first path lock-in amplifier, a frequency servo loop, a third path lock-in amplifier, a third path signal source, a second path photoelectric detector, a second path lock-in amplifier and an intensity compensation algorithm module. The method and device effectively compensate a gyro output error caused by laser optical power change, improve a gyro output precision, utilize an intensity compensation algorithm realized only through codes, realize real-time compensation and are free of other optical devices and electrical modules. The device has a simple structure and is conducive to system miniaturization.
Description
technical field [0001] The invention relates to the technical field of optical sensing and signal detection, in particular to a method and device for suppressing intensity modulation noise of a resonant fiber optic gyroscope light source based on secondary frequency signal detection technology. Background technique [0002] Resonator Fiber Optic Gyro (R-FOG) is an inertial sensor that uses the optical Sagnac effect to detect rotation. Theoretical research results show that the resonant fiber optic gyro can use much shorter fibers than the interferometer fiber optic gyro (I-FOG), and achieve the detection accuracy close to that of the interferometer fiber optic gyro. Therefore, in realizing There are potential advantages in miniaturization and cost reduction of gyroscopes. [0003] Tunable narrow-linewidth semiconductor laser is an important light source to realize the miniaturization of resonant fiber optic gyro system. In the resonant fiber optic gyro signal detection sys...
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Login to View More IPC IPC(8): G01C19/72
CPCG01C19/721G01C19/727
Inventor 应迪清毛建敏王泽宇金仲和
Owner ZHEJIANG UNIV