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A Chemical Trimming Method for Second Harmonic Error of Quartz Cylindrical Harmonic Oscillator

A harmonic oscillator and sub-harmonic technology, applied in the direction of instruments, measuring devices, steering sensing equipment, etc., can solve the problems of restricting the accuracy of vibrating gyroscopes and deterioration of gyroscope performance, achieve low cost, meet needs, and reduce the second harmonic The effect of the error value

Active Publication Date: 2022-03-04
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, for high-precision vibrating gyroscopes, even if the harmonic oscillator completes the adjustment of the fourth harmonic error, the second harmonic error will cause a significant deterioration in the performance of the gyroscope, seriously restricting the accuracy of the vibrating gyroscope

Method used

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  • A Chemical Trimming Method for Second Harmonic Error of Quartz Cylindrical Harmonic Oscillator
  • A Chemical Trimming Method for Second Harmonic Error of Quartz Cylindrical Harmonic Oscillator
  • A Chemical Trimming Method for Second Harmonic Error of Quartz Cylindrical Harmonic Oscillator

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Embodiment Construction

[0044] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0045] Quartz cylindrical shell harmonic oscillator modification system, such as image 3 As shown, it includes a constant temperature solution tank 1, a chemical etching solution 2, a cylindrical shell resonator 3, a resonator mount 4, a rotating table 5, an angle adjustment mechanism 6, an adapter plate 7, and a vertical displacement table 8; the resonator 3 Installed on the resonator mounting base 4 and connected to the rotating platform 5; the angle adjustment mechanism 6 is installed on the vertical displacement platform 8 through the adapter plate 7.

[0046]The constant temperature solution tank 1 is made of polytetrafluoroethylene, and is used to store highly corrosive chemical etching solution and keep the temperature of the chemical etching solution constant.

[0047] The chemical etchant 2 is composed of 49% HF solution and 40% N...

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Abstract

The invention belongs to the technical field of vibrating gyroscopes, and discloses a chemical trimming method for the second harmonic error of a quartz cylindrical resonator. The method includes steps: A. Obtaining the eigenfrequency and frequency cracking of the resonator through a frequency sweep method and the orientation of the intrinsic rigid axis; B. Calculate the second harmonic error value of the harmonic oscillator according to the eigenfrequency, mass, and amplitude ratio of the harmonic oscillator; C. According to the immersion depth, inclination angle, and second harmonic error of the harmonic oscillator according to chemical modification The second harmonic error value and the etching rate of the chemical etching solution calculate the chemical modification time; D. According to the chemical modification time, use the chemical etching solution to engrave the harmonic oscillator at two positions with an interval of 180° along the low frequency axis. eclipse. The second harmonic error value can be reduced by removing specific mass in the low-frequency axis orientation of the harmonic oscillator n=1 mode. This method can further improve the consistency and symmetry of the harmonic oscillator, reduce the noise in the output signal, and improve the cylindrical vibration. Gyro accuracy.

Description

technical field [0001] The invention belongs to the technical field of vibrating gyroscopes, and in particular relates to a chemical trimming method for the second harmonic error of a quartz cylindrical resonator. Background technique [0002] Cylindrical shell vibrating gyroscope is a solid-state gyroscope that uses the inertial effect of standing waves on its vibrating shell to detect angular velocity. It has the advantages of high precision, long life, low power consumption, small size, and low cost. It has advantages in the inertial field. Broad application prospects, is the current research hotspot. Its basic working principle is: under the excitation of the working frequency, the cylindrical shell harmonic oscillator generates standing wave vibration along the excitation direction. When there is an external angular velocity input, due to the existence of Coriolis force, a new standing wave vibration will be generated at a position 45° from the excitation direction, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/56G01C25/00
CPCG01C19/56G01C25/005
Inventor 潘瑶陶云峰贾永雷谭中奇金世龙杨开勇罗晖
Owner NAT UNIV OF DEFENSE TECH
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