Arrangement for contactless measurement of the volume flow or ma

Details Arrangement for contactless measurement of the volume flow or ma Arrangement for contactless measurement of the volume flow or ma

1987-08-05

1990-12-11

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring transit time of tracer or tag

364510, G01P 522

Patent

active

049761544

ABSTRACT:
The arrangement for contactless measurement of the volume flow or mass flow of a moving medium comprises two transducers which furnish electrical signals into which inhomogeneities of the moving medium enter depending on their spatial position in accordance with different spatial weighting functions. The detecting regions of the two transducers are offset with respect to each other in the direction of movement of the medium but partially overlap in such a manner that the gradient of the spatial cross correlation function for the spatial displacement zero is different from the zero vector. A correlator forms the time cross correlation function of the two signals and an evaluation circuit derives the measured value for the volume flow or mass flow of the moving medium from the gradient of the time cross correlation function for the time displacement zero. Alternatively, the measured value may also be derived from the first moment of the cross power density spectrum of the two signals because said moment is mathematically equivalent to the gradient of the time cross correlation function of the two signals for the time displacement zero.

REFERENCES:
patent: 3635082 (1972-01-01), Prellwitz et al.
patent: 3762221 (1973-10-01), Coulthard
patent: 3845660 (1974-11-01), McDonnell
patent: 4019038 (1977-04-01), Critten et al.
patent: 4604904 (1986-08-01), Massen
patent: 4708021 (1987-11-01), Braun et al.
patent: 4752727 (1988-06-01), Schneider

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