Non-contact measurements of ultrasonic waves on paper webs using

Details Non-contact measurements of ultrasonic waves on paper webs using Non-contact measurements of ultrasonic waves on paper webs using

1998-11-16

2000-09-05

Kim, Robert H.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356432, G01B 902

Patent

active

061151270

ABSTRACT:
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.

REFERENCES:
patent: 5131748 (1992-07-01), Monchalin et al.

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