Method and device for measuring torsional frequency of quartz pendulous reed on basis of laser triangulation method

Abstract

The invention discloses a method for measuring a torsional frequency of a quartz pendulous reed on the basis of a laser triangulation method. The method comprises the steps as follows: (1), two channels of laser triangle light sensors irradiate two sides of a center shaft of the quartz pendulous reed symmetrically; (2), according to a transient excitation measurement method, the quartz pendulous reed is excited through a transient excitation source, the pendulous reed vibrates under the excitation of the transient excitation source, the two channels of the laser triangle light sensors measure the vibration process of the pendulous reed to obtain a vibration signal y1 (t) and a vibration signal y2 (t), and the two channels of the signals are subtracted, so that a differential signal y (t) is obtained; and (3), the differential signal y (t) is subjected to waveform and spectrum analysis, and the torsional frequency f1 of the to-be-measured quartz pendulous reed is acquired through calculation. According to the method, the measurement accuracy and the measurement efficiency are improved.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, in particular to a method and device for measuring the twist frequency of a quartz pendulum plate based on laser triangulation. Background technique [0002] As the core sensitive device of the quartz accelerometer, the quartz pendulum is widely used in the inertial navigation system of aviation, aerospace vehicles and ships. During the processing of the quartz pendulum, the processing and testing of its cantilever is the key to ensure the processing quality of the entire device. For the dynamic parameters of cantilever beams, the stiffness has been used to judge the quality for a long time, and the static loading method is generally used to check the stiffness. However, due to the extremely small stiffness of the cantilever beam, this method has very strict requirements on the test conditions, and it is difficult to meet the test conditions, which leads to large errors in the te...

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Problems solved by technology

[0003] Yuan Feng et al [Yuan Feng, Shi Ping, Jiang Zujun, Bai Juncai, Yang Lemin. Quartz pendulum comprehensive parameter test system. Journal of Harbin University of Science and Technology. 1994,18(3):26-28] proposed to use photoelectric position sensitive element PSD as the sensor Test parameters such as the swing frequency and torsion frequency of the quartz pendulum. However, during the test, the quartz pendulum needs to be placed obliquely. At the same time, due to the self-vibration of the quartz pendulum, the adjustment of the optical path is complicated and the measurement accuracy is low. higher requirements, resulting in low measurement efficiency

[0004] Ma Hongwen, Tan Jiubin et al[Ma Hongwen, Tan Jiubin, Yang Wenguo, Yin Jing. Frequency measurement of diffuse reflection laser triangulation method for thin-sheet flexible elastic devices. Optoelectronics. Laser. 2004,15(7):849-852] proposed to use laser triangulation method to realize the Quartz pendulum is used for non-contact transient excitation measurement. This method has the advantages of convenient adjustment, high measurement accuracy and easy realization of automatic test on the production site. However, this method only realizes the measurement of swing frequency. In actual engineering, due to processing errors Due to the existence of the two cantilever beams, it is difficult to ensure that the two cantilever beams are precisely consistent, so the pendulum plate is usually accompanied by twisting during the swing process, which leads to the torsion frequency (torsional vibration frequency) of the quartz pendulum plate

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