Measuring and testing – Vibration – By mechanical waves
Patent
1993-10-13
1994-08-23
Noland, Thomas P.
Measuring and testing
Vibration
By mechanical waves
73609, 73610, 73613, G01H 500, G01N 2918
Patent
active
053396910
ABSTRACT:
An ultrasonic system for determining the quality of concrete under water hout inaccuracies caused by electromagnetic interference from the ultrasonic generator. An ultrasonic generator applies pulses to the concrete. An ultrasonic detector detects the ultrasonic pulses and produces corresponding signals that are indicative of ultrasonic pulses that have passed through the material. Signal processing circuitry processes the signals to determine the transit time of the ultrasonic pulses through the material. The signal processing circuitry is disabled for a predetermined time after application of each ultrasonic pulse to the material to prevent noise produced by the means for applying ultrasonic pulses to the material from entering the signal processing circuitry and causing spurious measurements.
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patent: 4926870 (1990-05-01), Brandenburger
patent: 4930511 (1990-06-01), Rossman et al.
patent: 5143072 (1992-09-01), Kantorovich et al.
patent: 5170667 (1992-12-01), Takeuchi et al.
Goff Dan
Kruchowy Roman
Rhoads Carl
Smith Anthony
Forrest, Jr. John L.
Kalmbaugh David S.
Noland Thomas P.
Sliwka Melvin J.
The United States of America as represented by the Secretary of
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