Abstract

A new optical device for making caliperlike noncontact dimensional measurements on macroscopic objects is described. The device called a pulsed laser caliper, consists of a picosecond pulse laser, an ultrafast detector, various optical components, and a time-interval counter or high-speed sampling oscilloscope. Basically, a dimensional measurement is made by determining the time-of-flight difference between a reference laser pulse and another pulse which reflects off both sides of an object. Accuracy and limitations of the device are discussed briefly. Experimental results using a mode-locked argon laser and a sampling oscilloscope for pulse timing gave an accuracy of 0.075 cm in dimensional measurements of five gauge blocks with lengths from 1.9 to 10.2 cm.

© 1986 Optical Society of America

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