Dynamic alignment system for an FT-NIR Michelson interferometer

Author

Kalamatianos, D. ; Edmunds, J.M. ; Wellstead, P.E. ; Houston, R.J. ; Liatsis, P. ; Christie, S.M. ; Dewhurst, R.J. ; Thorniley, M.S.

Author_Institution

Dept. of Electr. Eng. & Electron., Univ. of Manchester Inst. of Sci. & Technol. (UMIST), UK

fYear

2004

fDate

12-14 July 2004

Firstpage

120

Lastpage

124

Abstract

We present a description of a system for dynamic alignment of a novel Fourier transform Michelson interferometer which is operating in the near infrared (NIR) band. The technique relies on detection of the phase difference between four photodetectors mounted around the main detector. The system is controlled by a computer in real time. It uses a position observer to record the mirror position and with a feedback loop corrects the tilt of the moving mirror in the interferometer. This relatively simple system is very effective and can be applied to other scanning optical interferometers.

Keywords

Michelson interferometers; feedback; infrared detectors; mirrors; photodetectors; physical instrumentation control; position control; real-time systems; FT-NIR Michelson interferometer; Fourier transform Michelson interferometer; active control; dynamic alignment system; feedback loop; mirror position; mirror tilt; near infrared band; phase difference detection; photodetectors; position observer; real time control; scanning optical interferometers; system computer control; Control systems; Detectors; Feedback loop; Fourier transforms; Mirrors; Optical feedback; Optical interferometry; Phase detection; Photodetectors; Real time systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Virtual Environments, Human-Computer Interfaces and Measurement Systems, 2004. (VECIMS). 2004 IEEE Symposium on

Print_ISBN

0-7803-8339-7

Type

conf

DOI

10.1109/VECIMS.2004.1397201

Filename

1397201