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Title: Sphericity determination using resonant ultrasound spectroscopy

A method is provided for grading production quantities of spherical objects, such as roller balls for bearings. A resonant ultrasound spectrum (RUS) is generated for each spherical object and a set of degenerate sphere-resonance frequencies is identified. From the degenerate sphere-resonance frequencies and known relationships between degenerate sphere-resonance frequencies and Poisson's ratio, a Poisson's ratio can be determined, along with a "best" spherical diameter, to form spherical parameters for the sphere. From the RUS, fine-structure resonant frequency spectra are identified for each degenerate sphere-resonance frequency previously selected. From each fine-structure spectrum and associated sphere parameter values an asphericity value is determined. The asphericity value can then be compared with predetermined values to provide a measure for accepting or rejecting the sphere.
 [1];  [2];  [1]
  1. (Los Alamos, NM)
  2. (Santa Fe, NM)
Issue Date:
OSTI Identifier:
Regents of University of California, Office of Technology (Alameda, CA) LANL
Patent Number(s):
US 5355731
Contract Number:
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
sphericity; determination; resonant; ultrasound; spectroscopy; method; provided; grading; production; quantities; spherical; roller; balls; bearings; spectrum; rus; generated; set; degenerate; sphere-resonance; frequencies; identified; relationships; poisson; ratio; determined; diameter; form; parameters; sphere; fine-structure; frequency; spectra; previously; selected; associated; parameter; values; asphericity; value; compared; predetermined; provide; measure; accepting; rejecting; resonant ultrasound; resonant frequency; predetermined value; resonance frequency; predetermined values; parameter values; ultrasound spectroscopy; spherical diameter; determined values; frequency spectra; /73/