Measuring and testing – Vibration – By mechanical waves
Patent
1979-02-26
1980-10-21
Ruehl, Charles A.
Measuring and testing
Vibration
By mechanical waves
73900, G01N 2904
Patent
active
042286883
ABSTRACT:
A function generator provides a voltage vs. time curve which is also applied to the oscilloscope and is adjusted by the operator to conform to the peak amplitudes of the displayed electrical pulses. During subsequent testing, this voltage function is applied to a control signal generator which, in accordance with a predetermined relationship, modifies the voltage function into a control signal which is applied to the receiver. The control signal varies the receiver gain with time to attenuate and equalize the displayed pulses to a preselected amplitude.
The equalized pulses corresponding to the equal sized reflectors are dependent upon only the size of the reflector and are independent of the depth of the discontinuities within the test blocks. As a result of the adjustment to the receiver gain by the control signal, the magnitudes of all displayed echo pulses from workpieces subsequently tested by the system will be dependent only upon the sizes of the corresponding discontinuities in the workpieces.
REFERENCES:
patent: 3033029 (1962-05-01), Weighart
patent: 3367173 (1968-02-01), Uphoff
patent: 3690153 (1972-09-01), Matay
patent: 3724262 (1973-04-01), Niklas
patent: 4016750 (1977-04-01), Green
Automation Industries, Inc.
Carten Francis N.
Ruehl Charles A.
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