Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Takahiro Okuda0
Ichiro Ishimaru0
Date of Patent
April 17, 2007
0Patent Application Number
113680950
Date Filed
March 2, 2006
0Patent Primary Examiner
Patent abstract
A device for measuring thickness of an object has a vibration generator for generating vibrations in the object, a vibration detector for detecting vibrations generated in the object by the vibration generator and a frequency analyzer for calculating resonance frequency of the object. The vibration generator includes a light-emitting part which emits light towards the object to irradiate and to be absorbed by the object. A plurality of vibration detectors may be used and the frequency analyzer may include a sound speed analyzer for calculating speed of sound inside the object from vibrations detected by these plurality of vibration detectors.
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