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Open-loop detecting circuit for frequency modulated continuous wave optical fiber gyroscope based on phase comparison

A technology of frequency modulation continuous wave and fiber optic gyroscope, which is applied to Sagnac effect gyroscopes, measuring devices, instruments, etc., can solve the problem of no gyroscope detection circuit, etc., and achieve the effect of suppressing common mode errors

Active Publication Date: 2012-08-29
BEIHANG UNIV
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Problems solved by technology

Frequency modulation continuous wave double interference fiber optic gyroscope is a new type of fiber optic gyroscope proposed recently, and there is no detection circuit for this gyroscope at present

Method used

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  • Open-loop detecting circuit for frequency modulated continuous wave optical fiber gyroscope based on phase comparison
  • Open-loop detecting circuit for frequency modulated continuous wave optical fiber gyroscope based on phase comparison
  • Open-loop detecting circuit for frequency modulated continuous wave optical fiber gyroscope based on phase comparison

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Embodiment Construction

[0023] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, an open-loop detection circuit based on phase comparison frequency modulation continuous wave fiber optic gyroscope of the present invention includes two parts of analog pre-processing and digital domain processing, wherein the analog pre-processing part includes a band-pass filter module 1, a shaping module 2 and a multiplier 3 , AD pre-processing part 4, the digital domain processing part is FPGA processing module, this module mainly includes AD collector 5 and FPGA programming module 6. The AD pre-processing part 4 includes a low-pass filter 7 and an AD preamplifier 8 .

[0025] Based on the phase comparison, the two-way interference signals sent by the fast and slow axes of the frequency-modulated continuous wave fiber optic gyroscope are converted by the detector 9 (the optical signal is conver...

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Abstract

The invention provides an open-loop detecting circuit for a frequency modulated continuous wave optical fiber gyroscope based on phase comparison, belonging to the technical field of an optical fiber gyroscope. The open-loop detecting circuit comprises an analogue pretreatment part and a digital domain treatment part, wherein the analogue pretreatment part comprises a band-pass filtering module, a shaping module, a multiplier, and an AD (Analogue / Digital) pretreatment part; the digital domain treatment part comprises an AD collector and an FPGA (Field Programmable Gate Array) programming module; and the AD pretreatment part comprises a low-pass filter and an AD head amplifier. The invention provides the open-loop detecting circuit for the frequency modulated continuous wave optical fiber gyroscope based on the phase comparison. The novel frequency modulated continuous wave interference type optical fiber gyroscope is quantitatively detected by detecting a phase difference of two paths of signals, so that the influence on phase difference detection, caused by frequency modulation period and amplitude variation, can be removed. The common-mode error of the optical fiber gyroscope can be restrained well in a differential detection manner.

Description

technical field [0001] The invention relates to a frequency-modulated continuous wave double-interference optical fiber gyroscope open-loop detection circuit based on analog phase comparison, and belongs to the technical field of optical fiber gyroscopes. Background technique [0002] As a new type of inertial angular velocity sensor that is developing extremely rapidly, fiber optic gyroscope has been widely used in various fields with its unique technical and performance advantages. The internationally common form of fiber optic gyroscope is the single interference type, that is, the Sagnac interferometer is realized by using the fast axis or slow axis of a set of optical paths (a polarization-maintaining fiber ring), and through the clockwise (CW) and counterclockwise (CCW) propagation respectively The Sagnac phase shift caused by the carrier rotation is solved by the interference between the two main wave trains. Although the structure of this kind of interferometer is s...

Claims

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Application Information

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IPC IPC(8): G01C25/00G01C19/72
Inventor 金靖宋镜明李志敏潘雄滕飞肖智徐小斌
Owner BEIHANG UNIV
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