Research and Implementation of a Demodulation Switch Signal Phase Alignment System in Dynamic Environments
In the space gravitational wave detection mission, inertial sensors play the role of providing an inertial reference for the laser interferometric measurement system. Among them, the capacitance sensor serves as the core key technology of the inertial sensor, used to measure the relative position of...
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MDPI AG
2023-11-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/23/22/9144 |
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| author | Ke Xue Tao Yu Yanlin Sui Yongkun Chen Longqi Wang Zhi Wang Jun Zhou Yuzhu Chen Xin Liu |
| author_facet | Ke Xue Tao Yu Yanlin Sui Yongkun Chen Longqi Wang Zhi Wang Jun Zhou Yuzhu Chen Xin Liu |
| author_sort | Ke Xue |
| collection | DOAJ |
| description | In the space gravitational wave detection mission, inertial sensors play the role of providing an inertial reference for the laser interferometric measurement system. Among them, the capacitance sensor serves as the core key technology of the inertial sensor, used to measure the relative position of the test mass (TM) in the electrode cage. The capacitance sensor utilizes synchronous demodulation technology to extract signals from the AC induction signal. When the phase of the demodulation switch signal is aligned, the synchronous demodulator can most effectively filter out noise, thus directly influencing the performance of the capacitance sensor. However, since the TM is in a suspended state, the information read by the capacitance sensor is dynamic, which increases the difficulty of demodulation phase alignment. In light of this, a method is proposed for achieving the phase alignment of the demodulation switch signal in a dynamic environment. This is accomplished by adjusting the phase of the demodulation switch signal, and subsequently computing the phase difference between the AC induction signal and the demodulation switch signal. At the same time, a measurement and evaluation method for phase deviation is also proposed. Ultimately, an automatic phase alignment system for the demodulation switch signal in dynamic environments is successfully implemented on an FPGA platform, and tests are conducted on a hexapod PI console platform to simulate dynamic environments. The experimental results demonstrate that the system accurately achieves phase alignment in the static environment, with a phase deviation of 0.1394 rad. In the simulated dynamic environment, the phase deviation is 0.1395 rad. |
| first_indexed | 2024-03-09T16:28:41Z |
| format | Article |
| id | doaj.art-acf817b75e7c4a64b50e4eaafee794ea |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T16:28:41Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-acf817b75e7c4a64b50e4eaafee794ea2023-11-24T15:05:30ZengMDPI AGSensors1424-82202023-11-012322914410.3390/s23229144Research and Implementation of a Demodulation Switch Signal Phase Alignment System in Dynamic EnvironmentsKe Xue0Tao Yu1Yanlin Sui2Yongkun Chen3Longqi Wang4Zhi Wang5Jun Zhou6Yuzhu Chen7Xin Liu8Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaIn the space gravitational wave detection mission, inertial sensors play the role of providing an inertial reference for the laser interferometric measurement system. Among them, the capacitance sensor serves as the core key technology of the inertial sensor, used to measure the relative position of the test mass (TM) in the electrode cage. The capacitance sensor utilizes synchronous demodulation technology to extract signals from the AC induction signal. When the phase of the demodulation switch signal is aligned, the synchronous demodulator can most effectively filter out noise, thus directly influencing the performance of the capacitance sensor. However, since the TM is in a suspended state, the information read by the capacitance sensor is dynamic, which increases the difficulty of demodulation phase alignment. In light of this, a method is proposed for achieving the phase alignment of the demodulation switch signal in a dynamic environment. This is accomplished by adjusting the phase of the demodulation switch signal, and subsequently computing the phase difference between the AC induction signal and the demodulation switch signal. At the same time, a measurement and evaluation method for phase deviation is also proposed. Ultimately, an automatic phase alignment system for the demodulation switch signal in dynamic environments is successfully implemented on an FPGA platform, and tests are conducted on a hexapod PI console platform to simulate dynamic environments. The experimental results demonstrate that the system accurately achieves phase alignment in the static environment, with a phase deviation of 0.1394 rad. In the simulated dynamic environment, the phase deviation is 0.1395 rad.https://www.mdpi.com/1424-8220/23/22/9144inertial sensorscapacitive sensingphase alignment |
| spellingShingle | Ke Xue Tao Yu Yanlin Sui Yongkun Chen Longqi Wang Zhi Wang Jun Zhou Yuzhu Chen Xin Liu Research and Implementation of a Demodulation Switch Signal Phase Alignment System in Dynamic Environments Sensors inertial sensors capacitive sensing phase alignment |
| title | Research and Implementation of a Demodulation Switch Signal Phase Alignment System in Dynamic Environments |
| title_full | Research and Implementation of a Demodulation Switch Signal Phase Alignment System in Dynamic Environments |
| title_fullStr | Research and Implementation of a Demodulation Switch Signal Phase Alignment System in Dynamic Environments |
| title_full_unstemmed | Research and Implementation of a Demodulation Switch Signal Phase Alignment System in Dynamic Environments |
| title_short | Research and Implementation of a Demodulation Switch Signal Phase Alignment System in Dynamic Environments |
| title_sort | research and implementation of a demodulation switch signal phase alignment system in dynamic environments |
| topic | inertial sensors capacitive sensing phase alignment |
| url | https://www.mdpi.com/1424-8220/23/22/9144 |
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