Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1998-04-01
1999-08-24
Williams, Hezron
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73623, G01H 100
Patent
active
059426870
ABSTRACT:
An aspect of the present invention is an apparatus for inspecting a base of liquid filled tank for corrosion, having (a) a housing for use in the liquid filled tank; (b) a set of one or more ultrasonic transducers mounted to the housing, for directing one or more ultrasonic pulses at the base, where the ultrasonic pulses each have a frequency selected to produce a return signal from the base, and for receiving this return signal; and (c) a data capturing system, for storing information from these return signals. Optional features include a second set of one or more ultrasonic transducers for directing one or more ultrasonic pulses at the liquid/gas interface at a frequency selected to produce a return signal from the liquid/gas interface, a data analysis system, a locomotive system, and a spatial location system. Another aspect of the invention is a method for inspecting a base of a liquid filled tank for corrosion, having the steps: (a) directing a broadband ultrasonic pulse at the base from an ultrasonic transducer within the tank, where the ultrasonic pulse includes a resonant frequency for the tank base over the range of expected thicknesses for the base; (b) receiving a return signal with the ultrasonic transducer; (c) performing a Fourier analysis on the return signal to generate a frequency domain signal; and (d) determining the thickness of the base from the frequency domain signal.
REFERENCES:
patent: 4512194 (1985-04-01), Beuter
patent: 4912683 (1990-03-01), Katahara et al.
patent: 5205174 (1993-04-01), Silverman et al.
patent: 5554808 (1996-09-01), Chiao
Batra Narendra K.
Mignogna Richard B.
Simmonds Kirth E.
Karasek John
McDonnell Thomas E.
The United States of America as represented by the Secretary of
Tran Thuy Vinh
Williams Hezron
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