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Non-contact measurements of ultrasonic waves on paper webs using a photorefractive interferometer

United States Patent

September 5, 2000
View the Complete Patent at the US Patent & Trademark Office
An apparatus and method for non-contact measurement of ultrasonic waves on moving paper webs employs a photorefractive interferometer. The photorefractive interferometer employs an optical head in which the incident beam and reflected beam are coaxial, thus enabling detection of both in-plane and out-of-plane waves with a single apparatus. The incident beam and reference beams are focused into a line enabling greater power to be used without damaging the paper.
Brodeur; Pierre H. (Smyrna, GA), Lafond; Emmanuel F. (Atlanta, GA)
Institute of Paper Science and Technology (Atlanta, GA)
09/ 192,847
November 16, 1998
GOVERNMENT INTEREST This invention was made with Government support under Contract No. DE-FC07-97ID13578 awarded by the Department of Energy. The Government has certain rights in this Invention.