Measuring and testing – Vibration – By mechanical waves
Patent
1976-05-10
1977-11-08
Ruehl, Charles A.
Measuring and testing
Vibration
By mechanical waves
G01N 2904
Patent
active
040569713
ABSTRACT:
A distance amplitude compensation system is disclosed herein for comparing received signals with a reference signal having a time varying amplitude. The preferred embodiment of the invention disclosed herein is particularly adapted for use in an ultrasonic nondestructive testing system to vary the reference signal of the system as a function of time to compensate for variations of the echo signal produced by changes in the amplitude of the ultrasonic energy as it propagates through the workpiece as a result of attenuation or other causes. A pulser/receiver transmits ultrasonic signals into the workpiece, receives echo signals returned therefrom and produces received signals corresponding to the echo signals. A distance amplitude compensation generator produces a reference signal that has an amplitude that varies with time as a function of the manner in which the ultrasonic energy changtes as it propagates through the workpiece. The reference signal and the received signals are applied to a comparator circuit and if any of the received signals are larger than the reference signal a threshold train of pulses is transmitted to an alarm coincidence AND gate circuit which is gated for a predetermined period of time to produce an alarm if a flaw is detected in the workpiece. The alarm coincidence circuit may be coupled to any suitable utilization device such as a pulse counter to signal a flaw in the workpiece. The reference signal and the received signal are also applied to a suitable display device such as a CRT which has unblanking circuitry coupled thereto to unblank the CRT at predetermined periods of time to provide a display of the reference signal and the received signals.
REFERENCES:
patent: 3033029 (1962-05-01), Weighart
patent: 3260105 (1966-07-01), McNulty
patent: 3872715 (1975-03-01), Pittaro
patent: 3972228 (1976-08-01), Mansson
McCarroll Vincent P.
Van Valkenburg Howard E.
Automation Industries, Inc.
Flattery Thomas L.
Ruehl Charles A.
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