Modulation and demodulation circuit of fiber option gyroscope (FOG) open-loop signal

A fiber optic gyroscope and signal modulation technology, applied in the field of gyroscope, can solve the problems of increased sinusoidal operation error, low reliability, high price digital signal processor, etc., to simplify the signal processing circuit and reduce the error of arctangent operation small effect

Inactive Publication Date: 2010-04-21
ZHEJIANG UNIV
View PDF0 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of open-loop signal modulation and demodulation circuit has the following disadvantages: there are many unit circuit devices and low reliability; a digital signal processor with a higher price is required; b

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Modulation and demodulation circuit of fiber option gyroscope (FOG) open-loop signal
  • Modulation and demodulation circuit of fiber option gyroscope (FOG) open-loop signal
  • Modulation and demodulation circuit of fiber option gyroscope (FOG) open-loop signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] Such as figure 1 As shown, the open-loop signal modulation and demodulation circuit of the fiber optic gyroscope includes the optical part of the fiber optic gyroscope 1, the light source 1.1, the source beam splitter 1.2, the fiber optic polarizer 1.3, the ring beam splitter 1.4, the fiber optic sensing ring 1.5, and the phase modulator 1.6, photodetector 1.7, single-chip LVDT integrated circuit 2, first multiplier 2.1, second multiplier 2.2, comparator 2.3, divider 2.4, low-pass filter 2.5, sinusoidal signal source 2.6, amplifier 3, first filter 4, second filter 5, comparator and phase shifter 6, phase shifter circuit 6.1, comparator 6.2, single chip computer 7 with analog-to-digital converter; light emitted by light source 1.1 passes through source beam splitter 1.2 is divided into two, one of which enters the input end of the optical fiber polarizer 1.3, and the signal passing through the optical fiber polarizer 1.3 is input to the ring beam splitter 1.4, and is di...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a modulation and demodulation circuit of fiber option gyroscope (FOG) open-loop signals. The circuit adopts a monolithic LVDT integrated circuit (IC) for modulating and demodulating an FOG open-loop signal, generating a sinusoidal signal, synchronously detecting and dividing one odd harmonic amplitude and one even harmonic amplitude and acquiring the tangent value of a mobile signal phase by low-pass filtration. The invention uses the monolithic LVDT IC to realize the four functions, i.e., sinusoidal signal generation of a drive phase modulator, synchronous detection, the elimination of light-source light-intensity fluctuation influence and low-pass filtration and greatly simplify a signal-processing circuit; the monolithic LVDT IC outputs the tangent value of a mobile signal phase so that when the phase increases and trends to pi/2, the tangent value bends upwards, does not trend to saturation and reduces the error of a complementary tangent operation; and a division operation is internally realized by the monolithic LVDT IC so that a digital signal processor at a high price can be replaced by a monolithic computer at a low price for non-linear corrosion.

Description

technical field [0001] The invention relates to a gyroscope, in particular to an optical fiber gyroscope open-loop signal modulation and demodulation circuit. Background technique [0002] The existing fiber optic gyroscope open-loop signal modulation and demodulation circuit such as figure 2 . Optical part 1 of fiber optic gyro consists of light source 1.1, source beam splitter 1.2, fiber optic polarizer 1.3, ring beam splitter 1.4, fiber optic sensing ring 1.5, phase modulator 1.6 and photodetector 1.7; sinusoidal signal source 8 drives the optical The phase modulator 1.6 in the part 1, the photodetector 1.7 in the optical part 1 output the rotational electrical signal of the gyroscope relative to the inertial reference frame, and its signal contains each harmonic component of the frequency of the sinusoidal signal source 8, wherein the odd harmonic The amplitude of the wave signal is proportional to the sine value of the rotation signal phase; the amplitude of the even ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01C19/64
Inventor 周柯江阮晔锋张大茂申越
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap