Accession Number : ADP009002

Title :   The Evaluation of LDA Signals with Low SNR by a Fast Optical Burst Analyzer,

Corporate Author : DEUTSCHE FORSCHUNGSANSTALT FUER LUFT- UND RAUMFAHRT E V GOETTINGEN (GERMANY F R)

Personal Author(s) : Vogt, A. ; Buetefisch, K. A. ; Kompenhans, J.

Report Date : 23 JUL 1992

Pagination or Media Count : 7

Abstract : A new method is proposed to evaluate LDA signals by means of an optical Fourier transform instead of a digital transform in order to determine the Doppler frequency of the burst. Because the optical Fourier transform is a two dimensional spatial operation the interpretation of the spectra obtained by the proposed method is different from the one dimensional case of a time signal. It is expected that the two dimensional spectra give additional information with a higher level of confidence for better determining the correct signal frequencies even when SNR is very low. (Author)

Descriptors :   *LASER ANEMOMETERS, DOPPLER EFFECT, OPTICAL PROCESSING, FOURIER TRANSFORMATION, SIGNAL TO NOISE RATIO, LIGHT PULSES, FLOWMETERS, GERMANY.

Subject Categories : Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE