Measuring and testing – Vibration – Test chamber
Patent
1985-09-17
1988-01-05
Chapman, John
Measuring and testing
Vibration
Test chamber
73160, 73579, 73597, G01N 2900
Patent
active
047167645
ABSTRACT:
For determining the cross-section of running yarns, rovings and slivers in the textile industry, or of cables and filaments a test object is passed through an enclosed sonic chamber in which standing waves of at least two frequencies are generated by sonic emitters and their state is sensed by sonic receivers. The cross-section of the test object is determined by changes caused by the test object to the standing wave with respect to amplitudes, phases and/or pulses compared with undisturbed wave propagation. The particular arrangement of sonic emitters and sonic receivers causes especially appropriate modes of standing waves to be generated which act with optimum influence on the test object. As the device is used directly on production machines, which experience unavoidable vibrations during operation, measures are provided for at least partial compensation of unwanted signals caused by vibrations in the sonic receivers by their appropriate location and reciprocal electrical connection.
REFERENCES:
patent: 2538444 (1951-01-01), De Mars
patent: 3750461 (1973-08-01), Felix
patent: 3854327 (1974-12-01), Felix
patent: 4581935 (1986-04-01), Breazeale
Chapman John
Zellweger Uster., Ltd.
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