Accession Number:

ADD019003

Title:

Method and Apparatus for in Situ Measurement of Corrosion in Liquid Filled Tanks.

Descriptive Note:

Patent Application, Filed 1 Apr 98,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Report Date:

1998-04-01

Pagination or Media Count:

22.0

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 liquidgas interface at a frequency selected to produce a return signal from the liquidgas 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.

Subject Categories:

  • Containers and Packaging
  • Test Facilities, Equipment and Methods
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE