Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Lubricant testing
Patent
1977-07-18
1978-09-12
Ruehl, Charles A.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Lubricant testing
73 641, 340608, G01N 2902
Patent
active
041127404
ABSTRACT:
A method and apparatus for determining a change of the flow state of a flowable substance by transmitting ultrasonic or ultrasound waves of constant frequency to a spatial region of the substance, receiving ultrasonic waves backscattered by the substance, converting the backscattered ultrasonic waves into a primary signal which is amplitude- and phase-modulated in accordance with the backscattering and demodulating the primary signal in order to obtain a modulation signal. This modulation signal can be divided into a spectrum of signal components of different frequency and possessing pseudo periods which are defined as the time intervals between successive momentary values of the modulation signal, such momentary values corresponding to one another. The time duration corresponding to a predetermined number of pseudo periods is compared with a predetermined time duration.
REFERENCES:
patent: 3925773 (1975-12-01), Green
patent: 4003045 (1977-01-01), Stockdale
patent: 4012730 (1977-03-01), Nicholls
patent: 4014650 (1977-03-01), Sigelmann
Contraves AG
Kleeman Werner W.
Ruehl Charles A.
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