Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (01): 10102-010102.doi: 10.11889/j.0253-3219.2014.hjs.37.010102


Design of active feedback controller used in the infrared beam line of SSRF

ZHANG Yongli TONG Yajun ZHANG Zhaohong CHEN Min JIANG Jianguo GONG Peirong   

  1. (Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Zhangjiang Campus, Shanghai 201204, China)
  • Received:2013-08-12 Revised:2013-09-21 Online:2014-01-10 Published:2014-01-20


Background: The infrared beam line consists of many kinds of optical components that are susceptible to the external mechanical vibration, which will be further amplified by the long optical paths to seriously destroy the stability of infrared beam position. Purpose: The active feedback controller is used to stabilize the infrared beam position disturbed by the external environment. Methods: The design of the active feedback controller used in the infrared beam line of SSRF was proposed in this paper firstly, which included its background, light-path layout and operating process. Subsequently, the selections of the crucial components such as detector and actuator were discussed in details. Finally, the correction compensator design and its experimental test were also presented. The correction compensator design was realized by utilizing the frequency response method, and tested in time domain, frequency domain and mathematical model simulation of the controlled object. Results: The experimental tests included time domain step response signal of the controller, the time domain signal and its relevant magnitude spectrum in frequency domain due to the light source simulation vibration. Conclusion: The results show that the maximum effective operating band is 250 Hz and the maximum steady state error is 5 um.

Key words: Feedback controller, Correction compensator, Step response, Magnitude spectrum