Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1998-08-07
2000-06-20
Buczinski, Stephen C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
73657, G01P 336, G01B 902, G01N 2141
Patent
active
060783842
ABSTRACT:
Processes and arrangements for the evaluation of laser Doppler signals, especially in laser Doppler anemometers (LDA) or vibrometers, are disclosed. The object of these processes and arrangements is to find a simple possibility for evaluating laser Doppler signals which retains the advantages of conventional frequency tracking demodulation and permits dependable actual measurements of velocities and derived movement values also for extremely low velocities and discontinuous particle flows. This object is achieved with the use of a laser Doppler anemometer (LDA) with bandpass filtration and frequency tracking demodulation, by generating at least one orthogonal frequency system which, as a sequence of four state intervals in an invertible one-to-one correlation, is formed of two additively superimposed rectangular functions with a phase displacement of .pi./2, a detector signal containing the Doppler frequency (f.sub.D) is compared after bandpass filtering with respect to its phase with the state intervals of the orthogonal frequency system, wherein a change in the phase position relative to the orthogonal frequency system triggers a compensation of the change in Doppler frequency generating a regulated mixing frequency (f.sub.M) which is coupled into the LDA, and the regulated mixing frequency (f.sub.M), as an equivalent of the Doppler frequency (f.sub.D), is likewise compared with an orthogonal frequency system and, as a result of the one-to-one sequence of state intervals, is evaluated such that the direction is designated.
REFERENCES:
patent: 3982101 (1976-09-01), Kalb et al.
patent: 4856899 (1989-08-01), Iwaoka et al.
Bauer Juergen
Dammann Ehrhard
Buczinski Stephen C.
Jenoptik Aktiengesellschaft
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