Browse Prior Art Database

Measuring with Closed Circuit Television

IP.com Disclosure Number: IPCOM000073554D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Bojman, W: AUTHOR

Abstract

The system utilizes closed circuit television for precision dimensional measurements of objects to within a few microinches.

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Measuring with Closed Circuit Television

The system utilizes closed circuit television for precision dimensional measurements of objects to within a few microinches.

The object to be measured is held on a stage which is capable of moving in one direction. Rigidly mounted on the stage is a graduated scale having units larger than the intended resolution of the measuring system as shown in the upper figure.

Two closed circuit television cameras are rigidly mounted side by side and focused on the object and scale, respectively. The cameras have identical deflection characteristics with common synchronizing signals and the vertical sweeps are matched to at least 1%. The camera observing the object is equipped with a pair of horizontal measurement lines described in "Measurements With Closed-Circuit Television" in IBM Technical Disclosure Bulletin, page 24, Volume 12, No. 1, June 1969.

Camera 2 focused on the scale is equipped with an image detector to produce an electronic signal whenever a graduation mark of the scale is detected and the circuit is designed to produce a visible comparable dash on the monitor tube.

The circuit is designed to produce on the screen of a TV monitor a clearly visible dash at the convenient location on the monitor tube. This dash is a mark indicating the presence, at that particular time slot of the scan cycle, of a mark on the scale shown in the lower figure. The signal of the image detector of camera 2 is electrically mixed with the out...