单色器晶体角度微振动的高精度原位检测技术

樊奕辰; 李中亮; 徐中民; 张琦; 刘运; 王劼

doi:10.3788/CO.20201301.0156

Volume 13 Issue 1

Feb. 2020

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Article Contents

Chinese Optics > 2020 > 13(1): 156-164.

FAN Yi-chen, LI Zhong-liang, XU Zhong-min, ZHANG Qi, LIU Yun, WANG Jie. High-accuracy in-situ detection method of monochromator angular vibration[J]. Chinese Optics, 2020, 13(1): 156-164. doi: 10.3788/CO.20201301.0156

Citation:

FAN Yi-chen, LI Zhong-liang, XU Zhong-min, ZHANG Qi, LIU Yun, WANG Jie. High-accuracy in-situ detection method of monochromator angular vibration[J]. Chinese Optics, 2020, 13(1): 156-164. doi: 10.3788/CO.20201301.0156

Citation:

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High-accuracy in-situ detection method of monochromator angular vibration

doi: 10.3788/CO.20201301.0156

FAN Yi-chen^{1, 2, 4
,},
LI Zhong-liang^{1, 2},
XU Zhong-min^{1, 2},
ZHANG Qi³,
LIU Yun^{1, 2},
WANG Jie^{1, 2
,
,}

1.
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
2.
Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
3.
Dongnan University, Nanjing 211189, China
4.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds:

Supported by National Natural Science Foundation of China No.11505279

More Information

Corresponding author: WANG Jie, E-mail:wangjie@sinap.ac.cn
Received Date: 22 Apr 2019
Rev Recd Date: 04 Jun 2019
Publish Date: 01 Feb 2020

Abstract

Abstract

In order to achieve in-situ measurement of Double-Crystal Monochromator(DCM) stability, an angular vibration measuring system based on dual-frequency interferometers is designed, and a measurement platform is also established. A laser is split into two beams with an interferometer and then is aimed at the crystal surface. Reflective signals from both ends of the crystal are demodulated by a data acquisition board and the crystals' angular displacement information is acquired at high frequency. Its frequency information can also be obtained by means of Fast Fourier Transform(FFT), from which the primary source of vibration that influences the stability of the monochromator can be deduced. We can achieve high-frequency acquisition of crystal angular displacement with a resolution of up to 25nrad.With this, information on the different sources of vibration can be distinguished, which can be significant in DCM structure optimization.
- synchrotron radiation,
- double-crystal monochromator,
- angular vibration,
- dual-frequency interferometer

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References(17)

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