DocumentCode :
3327434
Title :
Wideband phase demodulation based on Fourier-transform techniques in optical heterodyne interferometry
Author :
Oka, K. ; Mizuno, T. ; Ohtsuka, Y.
Author_Institution :
Dept. of Eng. Sci., Hokkaido Univ., Sapporo, Japan
fYear :
1991
fDate :
28 Oct-1 Nov 1991
Firstpage :
1684
Abstract :
A method for computer-aided wideband phase-demodulation has been developed for taking out any time-varying phase in optical heterodyne interferometry. The generated beat-photocurrent is memorized in a digital transient memory so that its phase can be demodulated with the aid of a computer. The Fourier transform of the photocurrent obtained gives the photocurrent spectra from which only the beat-photocurrent spectra needed can be extracted. The Fourier inversion of the extracted spectra gives the significant parameters that can determine the time-varying phase of interest. This method makes it possible to measure any mode of vibration, not limited to a sinusoidal vibration, over 10 MHz in bandwidth. The frequency response of a vibrating mirror can be examined with a random Gaussian signal as one possible application
Keywords :
Fourier transform spectroscopy; computerised instrumentation; demodulation; light interferometry; vibration measurement; Fourier transform; computer-aided wideband phase-demodulation; optical heterodyne interferometry; photocurrent spectra; random Gaussian signal; time-varying phase; vibrating mirror; vibration measurement; Bandwidth; Demodulation; Fourier transforms; Frequency response; Optical computing; Optical interferometry; Optical mixing; Photoconductivity; Vibration measurement; Wideband;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Electronics, Control and Instrumentation, 1991. Proceedings. IECON '91., 1991 International Conference on
Conference_Location :
Kobe
Print_ISBN :
0-87942-688-8
Type :
conf
DOI :
10.1109/IECON.1991.239087
Filename :
239087
Link To Document :
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