Random ground vibration response of the optical delay line system of a stellar interferometer

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (2) : 159-164.

XU Mingming1,2,JI Hangxin1,2,XU Teng1,2,ZHANG Huatao1,2,WU Zhen1,2

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Abstract

The stability problem of an optical delay line system caused by random ground vibration was concerned. The random ground vibration signal and G acceleration power spectral density(PSD) were measured and the random vibration response of the mount was analyzed with the PSD module of Workbench finite element software. The Zernike polynomial coefficient,the translation of rigid body,the root mean square(RMS) value and peak-valley (PV) value of the parabolic reflector were calculated by fitting the nodes data. Introducing the Zernike polynomial coefficient into the optical system,the optical performance of the optical delay line system was analyzed. The rigid body translation of the parabolic reflector was measured by ELCOWAT 3000 Electronic Autocollimators. The analysis results show that the largest analytical errors with respect to the simulation and experiment are 7.6%. The RMS value is 9.6 nm,and PV value is 46.1 nm. The error of wavefront is 0.043λ. The actual vibration level of the installation base meets the stability requirement of the optical delay line system. The research on the relationship between the optical performance and the random vibration provides important reference to the optimal design and vibration isolation of other optical systems of stellar interferometers. 

Key words

optical delay line system / random vibration / finite element analysis / Zernike fitting / optical performance

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XU Mingming1,2,JI Hangxin1,2,XU Teng1,2,ZHANG Huatao1,2,WU Zhen1,2. Random ground vibration response of the optical delay line system of a stellar interferometer[J]. Journal of Vibration and Shock, 2017, 36(2): 159-164

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