Non-contact Measurements Of Ultrasonic Waves On Paper Webs Using A Photorefractive Interferometer
Brodeur, Pierre H.
Lafond, Emmanuel F.
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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.
- Georgia Tech Patents