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Interference type all-optical fiber gyroscope for inhibiting zero drift

A zero-point drift, gyroscope technology, applied in Sagnac effect gyroscopes, instruments, measuring devices and other directions, can solve the problem of large zero-point drift, achieve the effect of zero-point drift suppression and improve technical indicators

Inactive Publication Date: 2012-09-26
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantages of the interferometric fiber optic gyroscope are simple structure and low cost, but the disadvantage is that the zero point drift is relatively large

Method used

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  • Interference type all-optical fiber gyroscope for inhibiting zero drift
  • Interference type all-optical fiber gyroscope for inhibiting zero drift
  • Interference type all-optical fiber gyroscope for inhibiting zero drift

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0029] as attached figure 1 As shown in (b), the interference type all-fiber gyroscope involved in the embodiment of the present invention includes two parts,

[0030]The first part is a classic interferometric all-fiber gyroscope, which includes: 1-superluminescent light-emitting diode, 2-photodetection diode, 3-light source coupler, 4-polarizer, 5-optical ring coupler, 6-fiber ring , 10-oscillator; 11-demodulation / amplification circuit

[0031] The second part is the circuit unit involved in the present invention, which includes: 7-PZT piezoelectric ceramic phase modulator, 8-inverting switch, 9-single-chip microcomputer, three units in total.

[0032] The PZT piezoelectric ceramic phase modulator 7 is a cylindrical sheet, and part of the optical fiber (about 1 meter) of the fiber ring is wound and glued on its outer circle. The alternatin...

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Abstract

The invention discloses a method for inhibiting zero drift of an interference type all-optical fiber gyroscope and a corresponding interference type all-optical fiber gyroscope, belonging to the technical field of optical fiber sensing. The method for inhibiting the zero drift comprises the steps of: switching the polarity of an alternating voltage applied to a PZT (Pbbased Lanthanumdoped Zirconate Titanate) piezoelectric ceramic phase converter according to a set half cycle and using one half of the difference of rotating speeds output by the gyroscope in two adjacent half cycles as an output rotating speed of the gyroscope in the period. In the interference type all-optical fiber gyroscope, a phase reversing switch and a singlechip are additionally arranged based on the traditional product, wherein the phase reversing switch is used for controlling the polarity of the alternating voltage, and the singlechip is used for outputting a square wave signal to control the phase receiving switch and calculating the output rotating speed of the gyroscope according to an output signal of a demodulation / amplification circuit and the phase of the square wave signal. The invention can be widely applied to the technical fields of navigation, guidance, location, automatic control and the like.

Description

technical field [0001] The invention relates to an interference-type all-fiber gyroscope, in particular to a technology for suppressing zero drift of the interference-type all-fiber-optic gyroscope, and belongs to the technical field of optical fiber sensing. Background technique [0002] Gyroscope is an instrument for measuring inertial space angular velocity-angular displacement, and its history can be traced back thousands of years. Mechanical gyroscopes, laser gyroscopes, and fiber optic gyroscopes are called first-generation gyroscopes, second-generation gyroscopes, and third-generation gyroscopes, respectively. Fiber optic gyroscopes were first introduced in 1976 and went into mass production in the 1990s. Interferometric all-fiber gyroscope is an important variety in the fiber-optic gyroscope family, which can be widely used in navigation, guidance, positioning, automatic north-seeking, damping of train or ship swing, orientation of antenna-aiming system, oil well / mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00G01C19/72
Inventor 王心悦何昌洪王子宇
Owner PEKING UNIV
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