OPTICAL INTERFEROMETRIC RECEPTION OF ULTRASONIC ENERGY

摘要

TITLE OPTICAL INTERFEROMETRIC RECEPTION OF ULTRASONIC ENERGY INVENTOR Jean-Pierre Monchalin Non-contact reception of ultrasonic waves is accomplished by the use of a laser beam and an interferometer of the confocal Fabry-Perot type. The interferometer detects the frequency shift caused by the Doppler effect in an incident laser beam as a result of ultrasonic deformations of a workpiece. Improved stabilization and calibration techniques are disclosed.