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Method for reducing square two-frequency laser gyroscope magnetic sensitivity

A laser gyro and magnetic sensitivity technology, applied in Sagnac effect gyroscopes, measuring devices, instruments, etc., can solve the problems of cavity deformation, difficulty and no error, and achieve the effect of reducing magnetic sensitivity

Active Publication Date: 2013-12-04
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of many factors, this method is difficult to be free of errors. More importantly, these methods are all aimed at passive cavities. At this time, it is difficult for the resonant optical path to be exactly the same as the actual operating active cavity optical path. Consistent, and there is nothing to do about the cavity deformation caused by external factors in the future

Method used

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  • Method for reducing square two-frequency laser gyroscope magnetic sensitivity
  • Method for reducing square two-frequency laser gyroscope magnetic sensitivity
  • Method for reducing square two-frequency laser gyroscope magnetic sensitivity

Examples

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specific Embodiment 1

[0049] figure 1 It is a schematic diagram of a square two-frequency laser gyro with coils installed on the gyro cavity proposed by the present invention, which includes two plane mirrors 1, 2 and two optical path length control mirrors 3, 4 and is composed of the four mirrors Ring resonator, winding holes 5, 6 processed beside the gain area of ​​the ring resonator, coils 7, 8 wound on the gain area, gyro difference frequency signal output part 9, gyro light intensity signal output part 10, The optical path length control mirrors 3 and 4 can not only translate back and forth under the control of the path length control unit, but also can be deflected under the drive of the angle control unit, that is, they can not only translate back and forth to control the optical path length, but also angularly deflect. Controls the direction of the light path.

[0050] When the external magnetic field is figure 1 The square two-frequency laser gyro shown is in an unknown random rotation...

specific Embodiment 2

[0062] figure 2 It is a schematic diagram of a square two-frequency laser gyro with coils installed outside the gyro cavity proposed by the present invention, which includes two plane mirrors 11, 12 and two optical path length control mirrors 13, 14, and the four mirrors form a ring shape Resonant cavity, gyro difference frequency signal output part 15, gyro light intensity signal output part 16, coils 17, 18 placed outside the gyro cavity for generating magnetic field.

[0063] The coils 17 and 18 are installed in the gyroscope together with the gyro cavity. When the alternating magnetic field method is used in the first embodiment, an alternating current is first applied to the coils 17 and 18, and an alternating current is applied to the coils 17 and 18 through relevant technical means such as detection or spectrum analysis. Distinguish changes with frequency ω in size, the closed-loop measurement and control method is adopted, and the gyro is continuously obtained. I...

specific Embodiment 3

[0068] In the test room of the square two-frequency laser gyro before leaving the factory, the figure 2 The shown coil is installed in the square two-frequency laser gyro outside the gyro cavity, and the method and method adopted in the second embodiment are used to obtain the optimal control parameters of the control voltage of the pitch direction on a group of optical path length control mirrors 13 and 14; Subsequently, only the gyro block is installed in the gyroscope, and the open-loop measurement and control method is adopted, and the above method is used to measure a set of control voltage parameters of the pitch angle of the optical path length control mirror with the minimum magnetic sensitivity of the gyro, and use it as the implementation. In the example of the normal working parameters of the gyro, the optical path length control mirror of the gyro has been controlling the optical path of the gyro with this group of parameters.

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Abstract

The invention discloses a method for reducing square two-frequency laser gyroscope magnetic sensitivity. The method includes the steps that a, at least two adjacent light path long control mirrors are installed in four reflectors on a square two-frequency laser gyroscope; b, an external magnetic field is initiatively applied to the laser gyroscope in a normal work state, and gyroscope difference frequency change caused by application of the external magnetic field is detected; c, angles of pitch of the two light path long control mirrors are controlled so as to adjust coplane degrees of a resonance light path of a gyroscope resonance cavity, the gyroscope difference frequency change caused by the external magnetic field is made to be the smallest and the state is kept finally. Compared with the prior art, the method is characterized in that path length control mirrors commonly used in the square two-frequency laser gyroscope in the prior art are replaced by light path long control mirrors, the angle control function of the control mirrors is utilized, gyroscope difference frequency signals serve as detection objects directly, non-coplanar angles of the resonance light path are reduced through adjustment, and therefore the purpose of reducing the square two-frequency laser gyroscope magnetic sensitivity can be achieved.

Description

technical field [0001] The invention relates to an optical angular velocity sensing technology, in particular to a method for reducing the magnetic sensitivity of a square two-frequency laser gyro. Background technique [0002] The laser gyro is an angular velocity sensor based on the Sagnac effect. It reflects the input angular velocity through the resonant frequency difference of a pair of bidirectional traveling waves operating in a ring resonator. One of them is a quadrilateral formed by four mirrors. Two-frequency laser gyroscope with ring resonant optical path (such as image 3 shown), its structure usually includes an octagonal gyro block a, which is machined with 4 patch surfaces to support the mirror and capillary holes for passing light and filling the gain medium, two flat mirrors b, c and two spherical mirrors d and e optical glue form a ring resonant cavity on the four patch surfaces of the gyro block a; the spherical mirrors d and e also serve as the length con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C19/66G01C25/00
Inventor 金世龙袁杰胡绍民滕庆华
Owner NAT UNIV OF DEFENSE TECH
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