Solid-state wave gyroscope ensuring the required accuracy parameters

Raspopov, V. Ya.; Volchikhin, I. A.

doi:10.23919/icins.2018.8405893

Cited by 4 publications

(2 citation statements)

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“…The fourth harmonic error mainly causes the frequency split of the n = 2 mode and is a primary error source of the gyroscope. There are several ways to reduce the fourth harmonic error, such as electrostatic trimming [ 19 , 20 , 21 ], mechanical trimming [ 22 , 23 , 24 ], femtosecond laser trimming [ 25 ], chemical trimming [ 26 , 27 ], and ion beam trimming [ 28 , 29 ]. The electrostatic trimming requires extra voltages which makes the circuit more complicated and may introduce new noise and errors.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Estimating and Balancing the Second Harmonic Error of Cylindrical Fused Silica Resonators

et al. 2021

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The cylindrical resonator gyroscope (CRG) is a type of Coriolis vibratory gyroscope which measures the angular velocity or angle through the precession of the elastic wave of the cylindrical resonator. The cylindrical fused silica resonator is an essential component of the CRG, the symmetry of which determines the bias drift and vibration stability of the gyroscope. The manufacturing errors breaking the symmetry of the resonator are usually described by Fourier series, and most studies are only focusing on analyzing and reducing the fourth harmonic error, the main error source of bias drift. The second harmonic error also is one of the obstacles for CRG towards high precision. Therefore, this paper provides a chemical method to evaluate and balance the second harmonic error of cylindrical fused silica resonators. The relation between the frequency split of the n = 1 mode and the second harmonic error of the resonator is obtained. Simulations are performed to analyze the effects of the first three harmonic errors on the frequency splits. The relation between the location of the low-frequency axis of n = 1 mode and the heavy axis of the second harmonic error is also analyzed by simulation. Chemical balancing experiments on two fused silica resonators demonstrate the feasibility of this balancing procedure, and show good consistency with theoretical and simulation analysis. The second harmonic error of the two resonators is reduced by 86.6% and 79.8%, respectively.

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Section: Introductionmentioning

confidence: 99%

A Novel Method for Estimating and Balancing the Second Harmonic Error of Cylindrical Fused Silica Resonators

et al. 2021

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“…Wang et al reported a technique on permanent frequency split reduction of fused quartz micro wineglass resonators by directional lapping [20,21]. Raspopov et al presented a method of manually removing mass from the metal resonator [22]. Yi et al analyzed the influence of different trimming positions on the eigenfrequency of the resonator using the equivalent mass-defect model, and the frequency split was reduced to 0.028 Hz by mechanical trimming [23].…”

Section: Introductionmentioning

confidence: 99%

Trimming of Imperfect Cylindrical Fused Silica Resonators by Chemical Etching

Tao

Pan

Jin

et al. 2019

Sensors

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The cylindrical resonator gyroscope (CRG) is a kind of solid-state gyroscope with a wide application market. The cylindrical resonator is the key component of CRG, whose quality factor and symmetry will directly affect the performance of the gyroscope. Due to the material properties and fabrication limitations, the actual resonator always has some defects. Therefore, frequency trimming, i.e., altering the local mass or stiffness distribution by certain methods, is needed to improve the overall symmetry of the resonator. In this paper, we made further derivation based on the chemical trimming theory proposed by Basarab et al. We built up the relation between the frequency split and the balanced mass to determine the mass to be removed. Chemical trimming experiments were conducted on three cylindrical fused silica resonators. The frequency splits of the three resonators were around 0.05 Hz after chemical trimming. The relation between frequency split and balanced mass established from experimental data was consistent with the theoretical calculation. Therefore, frequency split can be reduced to lower than 0.05 Hz under rigorous theoretical calculation and optimized chemical trimming parameters.

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