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Title: Method and apparatus for measuring surface contour on parts with elevated temperatures

Abstract

The invention is directed to a method and apparatus for measuring the surface contour of a test piece, such as the bow of a radioactive fuel rod, which is completely immersed in water. The invention utilizes ultrasonic technology and is capable of measuring surface contours of test pieces which are at a higher temperature than the surrounding water. The presence of a test piece at a higher temperature adversely affects the distance measurements by causing thermal variations in the water near the surface of the test piece. The contour measurements depend upon a constant temperature of the water in the path of the ultrasonic wave to provide a constant acoustical velocity (the measurement is made by the time of flight measurement for an ultrasonic wave). Therefore, any variations of water temperature near the surface will introduce errors degrading the measurement. The present invention overcomes these problems by assuring that the supply of water through which the ultrasonic waves travel is at a predetermined and constant temperature.

Inventors:
 [1];  [2];  [3];  [3]
  1. Canton, MI
  2. McMurray, PA
  3. Pittsburgh, PA
Issue Date:
Research Org.:
Westinghouse Electric Corp., Pittsburgh, PA (United States)
OSTI Identifier:
868011
Patent Number(s):
5054321
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
AC11-76PN00014
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; measuring; surface; contour; elevated; temperatures; directed; piece; bow; radioactive; fuel; rod; completely; immersed; water; utilizes; ultrasonic; technology; capable; contours; pieces; temperature; surrounding; presence; adversely; affects; distance; measurements; causing; thermal; variations; near; depend; constant; path; wave; provide; acoustical; velocity; measurement; time; flight; introduce; errors; degrading; overcomes; assuring; supply; waves; travel; predetermined; water temperature; ultrasonic wave; constant temperature; elevated temperatures; elevated temperature; fuel rod; ultrasonic waves; surface contour; measuring surface; adversely affect; radioactive fuel; surrounding water; acoustical velocity; temperature near; distance measurement; active fuel; distance measurements; /73/

Citation Formats

Horvath, Mark S, Nance, Roy A, Cohen, George H, and Fodor, George. Method and apparatus for measuring surface contour on parts with elevated temperatures. United States: N. p., 1991. Web.
Horvath, Mark S, Nance, Roy A, Cohen, George H, & Fodor, George. Method and apparatus for measuring surface contour on parts with elevated temperatures. United States.
Horvath, Mark S, Nance, Roy A, Cohen, George H, and Fodor, George. Tue . "Method and apparatus for measuring surface contour on parts with elevated temperatures". United States. https://www.osti.gov/servlets/purl/868011.
@article{osti_868011,
title = {Method and apparatus for measuring surface contour on parts with elevated temperatures},
author = {Horvath, Mark S and Nance, Roy A and Cohen, George H and Fodor, George},
abstractNote = {The invention is directed to a method and apparatus for measuring the surface contour of a test piece, such as the bow of a radioactive fuel rod, which is completely immersed in water. The invention utilizes ultrasonic technology and is capable of measuring surface contours of test pieces which are at a higher temperature than the surrounding water. The presence of a test piece at a higher temperature adversely affects the distance measurements by causing thermal variations in the water near the surface of the test piece. The contour measurements depend upon a constant temperature of the water in the path of the ultrasonic wave to provide a constant acoustical velocity (the measurement is made by the time of flight measurement for an ultrasonic wave). Therefore, any variations of water temperature near the surface will introduce errors degrading the measurement. The present invention overcomes these problems by assuring that the supply of water through which the ultrasonic waves travel is at a predetermined and constant temperature.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

Patent:

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