Study on the charge driven displacement behavior of the actuator of the point ahead angle mechanism of a space gravitational wave telescope

Yan Zehao; Zhou Ziye; Li Yang; Zhou Hong; Huang Linhai; Gu Naiting; Rao Changhui

doi:10.12086/oee.2023.230223

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Yan Z H, Zhou Z Y, Li Y, et al. Study on the charge driven displacement behavior of the actuator of the point ahead angle mechanism of a space gravitational wave telescope[J]. Opto-Electron Eng, 2023, 50(11): 230223. doi: 10.12086/oee.2023.230223

Citation:

Yan Z H, Zhou Z Y, Li Y, et al. Study on the charge driven displacement behavior of the actuator of the point ahead angle mechanism of a space gravitational wave telescope[J]. Opto-Electron Eng, 2023, 50(11): 230223. doi: 10.12086/oee.2023.230223

Study on the charge driven displacement behavior of the actuator of the point ahead angle mechanism of a space gravitational wave telescope

1.
University of Chinese Academy of Sciences, Beijing 100049, China
2.
Institude of Optics and Electronics, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China
3.
Key Laboratory of Adaptive Optics, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China

Fund Project: Project supported by National Key Research and Development Program of China (2021YFC2202200, 2021YFC2202204), and Excellent Member of Chinese Academy of Sciences Youth Promotion Association (Y2022097)

More Information

^*Corresponding author: gunaiting@ioe.ac.cn

Received Date 06 September 2023

Revised Date 10 November 2023

Accepted Date 13 November 2023

Published Date 29 December 2023

Abstract

Abstract

The point ahead angle mechanism (PAAM) is a key component of the space gravitational wave detection telescope. It can control the displacement of the telescope precisely by inputting voltage or charge to the piezoelectric actuator. Therefore, the displacement response of the piezoelectric ceramic actuator directly affects the pointing control performance of the PAAM. In this paper, the equivalent capacitance calculation method is proposed to quantitatively analyze the displacement response characteristics of piezoelectric actuators driven by charge, and the accuracy and feasibility of the calculation method are verified by numerical simulation and experimental verification. The results show that when a charge amplifier controlled by 5 V, 0.05 Hz~5 Hz sine wave signal is used to drive a certain type of piezoelectric actuator, the maximum deviation of displacement response between the analysis results and the experimental results is within 1.35%, which provides a possible analysis method and realization way for the high-precision pointing control of the PAAM of the space gravitational wave detection telescope.
- piezoelectric actuators /
- hysteretic nonlinearity /
- charge drive method /
- nonlinear capacitance

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References

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Overview

Overview

In the space gravitational wave telescope, the Point Ahead Angle Mechanism (PAAM) is the essential core device to realize ultra-long beam distance measurement and nrad/Hz^1/2 level ultra-high precision pointing control. The Piezoelectric Actuator (PZA) is the core component of the PAAM, which mainly controls the displacement through the external input voltage or charge, and drives the PAAM to make the laser beam produce a small inclination Angle to realize the high precision Angle control of the spaceborne telescope. Therefore, the displacement response of piezoelectric ceramic actuators directly affects the pointing control performance of the PAAM. However, the inherent hysteresis of piezoelectric materials causes the linearity of the displacement response of PZA to deteriorate, which makes it difficult to control the direction of the PAAM. In order to realize the high linearity drive of PZA, the charge drive method is worth trying. This paper studies the response behavior of PZA driven by charge. In order to verify the advantage of the charge-driven method in improving the linearity of the displacement response of PZA, the comparison of the charge-driven method with the voltage-driven method is made. The experimental results show that although the charge-driven method has an advantage in improving the linearity of the displacement response compared with the voltage-driven method, there is still poor linearity at low frequency. In this paper, it is pointed out that the main cause of linearity variation under low-frequency signal is the mismatch of circuit components caused by the change of equivalent capacitance of PZA with the signal. In order to accurately describe the displacement response behavior of PZA under low-frequency signals, this paper proposes a calculation method for the equivalent capacitance of PZA. By fitting the equivalent capacitance, a mathematical model of the displacement response of the PZA under charge driving is established, and the displacement response characteristics of the PZA under charge driving are quantitatively analyzed. The accuracy and feasibility of the calculation method are verified by numerical simulation and experimental verification. The results show that when a charge amplifier controlled by 5 V, 0.05 Hz~5 Hz sine wave signal is used to drive a certain type of piezoelectric actuator, the maximum deviation of displacement response between the analysis results and the experimental results is within 1.35%. Which provides a possible analysis method and realization way for the high-precision pointing control of the Point Ahead Angle Mechanism of the space gravitational wave detection telescope.