High Precision Tri-Axial Quartz Flexible Accelerometers Resolution Measurement Method Based on Tri-Axial Turntable

Abstract

Aiming at the high requirements of the experimental equipment for the measurement of high precision quartz flexible accelerometer resolution, the gravity measured by high precision tri-axial accelerometers was subdivided by the tri-axial turntable. Tri-axial quartz flexible accelerometers resolution measurement model was established and general mathematical expression for the resolution measurement was derived. Based on the mathematical expression, the effective angle range that satisfied the measurement condition was given out. Besides, the tri-axial quartz flexible accelerometers resolution measurement process was designed. Within the effective angle range, numerical simulations were performed and the simulation results showed that: the proposed method can theoretically measure tri-axial quartz flexible accelerometers of which the resolution was about 10 −6 g. Then the tri-axial quartz flexible accelerometers resolution repetitive measurement experiments were carried out and the experimental results illustrated that: the difference between the measured value with the theoretical value is within 1µg, which met the requirements for use. In addition, the resolution of tri-axial quartz flexible accelerometers can be measured at one time based on the designed process, demonstrating that the proposed method was valid. INDEX TERMS Tri-axial turntable, tri-axial quartz flexible accelerometers, gravity subdivision, resolution measurement.

Mechanical model analysis and reliability design approach of Quartz Flexible Accelerometer under fractured state

“…However, the fault diagnosis of QFA mounted on carriers is difficult to proceed especially on the fracture state caused by an enormous external impact. Most studies tend to propose the method aiming at the calibration of the QFA without considering the detachability from applications [16][17][18][19]. They are meaningful in the situation that the QFA is rarely used; nevertheless, for the applications where QFA cannot be disassembled and replaced expediently under a damage case, rebuilding the effective closeloop system is more valuable.…”

Study on driving noise of quartz flexible accelerometer torquer

“…restricting the further improvement of navigation performance of inertial navigation system [1]. In recent years, the research on the influence of temperature [2][3][4][5], magnetic circuit [6][7][8], pendulum reed structure [9][10][11], calibration error [12][13][14][15][16] and other factors on the performance of QFA has been relatively mature, but the research on the internal components of QFA and readout circuit generated noise during operation is relatively few. Zhou et al [17] designed a single carrier modulated differential capacitance detection circuit, which can effectively eliminate the influence of parasitic resistance and capacitance and theoretically ensure the stability of sensitivity.…”

A method for improving the performance of centering rod surveying based on two-position correction

“…Due to the advantages of high positioning accuracy, short observation time and easy operation, it is widely used in engineering surveys. During centering rod surveying, roll and pitch are usually measured by accelerometers [6][7][8], whereas yaw is generally measured by a magnetometer [9,10]. As a consequence, the accuracy of pitch measurement is affected by the errors of the accelerometer itself [11].…”