Patent Number: 6,253,615

Title: Method and apparatus for in situ measurements of corrosion of submerged surfaces

Abstract: An aspect of the present invention is an apparatus for inspecting a base of a 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.

Inventors: Simmonds; Kirth E. (Clinton, MD), Batra; Narendra K. (Springfield, VA), Mignogna; Richard B. (La Plata, MD)

Assignee: The United States of America as represented by the Secretary of the Navy

International Classification: G01B 17/02 (20060101); G01N 29/44 (20060101); G01N 29/46 (20060101); G01H 001/00 (); G01N 029/00 ()

Expiration Date: 07/03/2018