Browse Prior Art Database

Linear Dimension Measurement

IP.com Disclosure Number: IPCOM000078844D
Original Publication Date: 1973-Mar-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

George, OE: AUTHOR

Abstract

Vertical linear dimensions may be measured with a two-frequency laser and remote interferometer.

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Linear Dimension Measurement

Vertical linear dimensions may be measured with a two-frequency laser and remote interferometer.

The dimension h is measured by directing the laser beam through a remote interferometer modified to bend the beam 90 degrees and then to a corner cube reflector which is mounted on the gage head of a counterweighted linear air bearing column. The position of the gage head determines a fringe count, indicated by the recorder, which is a function of h. The gage position may be moved after an air clamp, attached to a long lever arm near its pivot point, closes on the counterbalance wire. A micrometer moves the lever arm at its greatest length, thus moving the counterbalance wire and positioning the air bearing. Coarse positioning is accomplished by merely moving the counterweight with the air clamp released.

A rotary air bearing, having zero vertical displacement, is attached to the gage head. A measuring probe, attached to the rotary air bearing, may be swung in a horizontal arc to sense the object being measured.

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