Resonant frequency method for bearing ball inspection

Patent · Fri Jan 01 00:00:00 EST 1993

OSTI ID:868992

Khuri-Yakub, B T ^[1]; Hsieh, Chung-Kao ^[2]

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1. Palo Alto, CA
2. Stanford, CA

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.

• Research Organization: Stanford Univ., CA (United States)
• DOE Contract Number: FG03-84ER45157
• Assignee: Board of Trustees of Leland Stanford Junior University (Stanford, CA)
• Patent Number(s): US 5257544
• OSTI ID: 868992
• Country of Publication: United States
• Language: English

Related Subjects

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
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