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The application of frequency characteristics test in fast control mirror system
Gan, Xun1,2,3; Jang, Yu1,2; Wang, Zong You1,2; Mao, Yao1,2
Volume9676
Pages96760Q
2015
Language英语
ISSN0277-786X
DOI10.1117/12.2199366
Indexed BySCI ; Ei
Subtype会议论文
AbstractThe control bandwidth of the FSM affects directly on the performance of the tracking system based on the compound axis servo structure. The FSMs control systems accuracy affects the bandwidth and the tracking precision of the system directly. Obtaining the accurate transfer function of the control object is the basis of designing frequency characteristics based control system. Measurement of high precision transfer function is needed to compensate the influence of the mechanical resonance. The mechanical resonance of fast control mirror is mainly of high frequency. In this case, the measured signals SNR is low so that the measurement accuracy of the frequency characteristic is reduced accordingly. One way to get frequency characteristics is to input sweeping sine drive signal to the system, measure the output of system, and then calculate the frequency characteristics by Fourier Transformation. However, the measuring result of the FSM system that has a low SNR in high frequency is not precise enough as in a system with a high SNR. To solve the problem mentioned above, this article presents a method to calculate frequency characteristics of an FSM system. This method uses the least squares to fit the fast mirror output overall waveform and the input source can be sine, white noise, multimode signal or chirp signal. A digital compensator based on this method is introduced to experimentally verify the efficiency of the method. Experiment results show that fitting the systems output curve in high frequency can effectively eliminate influence of quantization noise, gauss measurement noise and harmonic interference on the measurement accuracy and thus enhance the measuring signal SNR. It is proved that by using this method a more accurate frequency characteristics of the FSM can be obtained. © 2015 SPIE.; The control bandwidth of the FSM affects directly on the performance of the tracking system based on the compound axis servo structure. The FSMs control systems accuracy affects the bandwidth and the tracking precision of the system directly. Obtaining the accurate transfer function of the control object is the basis of designing frequency characteristics based control system. Measurement of high precision transfer function is needed to compensate the influence of the mechanical resonance. The mechanical resonance of fast control mirror is mainly of high frequency. In this case, the measured signals SNR is low so that the measurement accuracy of the frequency characteristic is reduced accordingly. One way to get frequency characteristics is to input sweeping sine drive signal to the system, measure the output of system, and then calculate the frequency characteristics by Fourier Transformation. However, the measuring result of the FSM system that has a low SNR in high frequency is not precise enough as in a system with a high SNR. To solve the problem mentioned above, this article presents a method to calculate frequency characteristics of an FSM system. This method uses the least squares to fit the fast mirror output overall waveform and the input source can be sine, white noise, multimode signal or chirp signal. A digital compensator based on this method is introduced to experimentally verify the efficiency of the method. Experiment results show that fitting the systems output curve in high frequency can effectively eliminate influence of quantization noise, gauss measurement noise and harmonic interference on the measurement accuracy and thus enhance the measuring signal SNR. It is proved that by using this method a more accurate frequency characteristics of the FSM can be obtained. © 2015 SPIE.
Conference NameProceedings of SPIE - The International Society for Optical Engineering
Conference Date2015
Citation statistics
Document Type会议论文
Identifierhttp://ir.ioe.ac.cn/handle/181551/7420
Collection光电工程总体研究室(一室)
Affiliation1. Institute of Optics and Electronics, Chinese Academy of Science, Chengdu, China
2. Key Laboratory of Optical Engineering, Chinese Academy of Sciences, Chengdu, China
3. University of Chinese Academy of Sciences, Beijing, China
Recommended Citation
GB/T 7714
Gan, Xun,Jang, Yu,Wang, Zong You,et al. The application of frequency characteristics test in fast control mirror system[C],2015:96760Q.
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