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Title: Resonant frequency method for bearing ball inspection

Abstract

The present invention provides for an inspection system and method for detecting defects in test objects which includes means for generating expansion inducing energy focused upon the test object at a first location, such expansion being allowed to contract, thereby causing pressure wave within and on the surface of the test object. Such expansion inducing energy may be provided by, for example, a laser beam or ultrasonic energy. At a second location, the amplitudes and phases of the acoustic waves are detected and the resonant frequencies' quality factors are calculated and compared to predetermined quality factor data, such comparison providing information of whether the test object contains a defect. The inspection system and method also includes means for mounting the bearing ball for inspection.

Inventors:
 [1];  [2]
  1. (Palo Alto, CA)
  2. (Stanford, CA)
Issue Date:
Research Org.:
Stanford Univ., CA (United States)
OSTI Identifier:
868992
Patent Number(s):
5257544
Assignee:
Board of Trustees of Leland Stanford Junior University (Stanford, CA) OAK
DOE Contract Number:  
FG03-84ER45157
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
resonant; frequency; method; bearing; ball; inspection; provides; detecting; defects; means; generating; expansion; inducing; energy; focused; location; allowed; contract; causing; pressure; wave; surface; provided; example; laser; beam; ultrasonic; amplitudes; phases; acoustic; waves; detected; frequencies; quality; factors; calculated; compared; predetermined; factor; data; comparison; providing; information; contains; defect; mounting; ultrasonic energy; acoustic wave; resonant frequency; laser beam; acoustic waves; pressure wave; providing information; predetermined quality; resonant frequencies; detecting defects; /73/

Citation Formats

Khuri-Yakub, B. T., and Hsieh, Chung-Kao. Resonant frequency method for bearing ball inspection. United States: N. p., 1993. Web.
Khuri-Yakub, B. T., & Hsieh, Chung-Kao. Resonant frequency method for bearing ball inspection. United States.
Khuri-Yakub, B. T., and Hsieh, Chung-Kao. Fri . "Resonant frequency method for bearing ball inspection". United States. https://www.osti.gov/servlets/purl/868992.
@article{osti_868992,
title = {Resonant frequency method for bearing ball inspection},
author = {Khuri-Yakub, B. T. and Hsieh, Chung-Kao},
abstractNote = {The present invention provides for an inspection system and method for detecting defects in test objects which includes means for generating expansion inducing energy focused upon the test object at a first location, such expansion being allowed to contract, thereby causing pressure wave within and on the surface of the test object. Such expansion inducing energy may be provided by, for example, a laser beam or ultrasonic energy. At a second location, the amplitudes and phases of the acoustic waves are detected and the resonant frequencies' quality factors are calculated and compared to predetermined quality factor data, such comparison providing information of whether the test object contains a defect. The inspection system and method also includes means for mounting the bearing ball for inspection.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {1}
}

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