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Browse Prior Art Database

Data Reduction System - Fine Scan

IP.com Disclosure Number: IPCOM000097778D
Original Publication Date: 1961-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Horwitz, LP: AUTHOR [+2]

Abstract

A scanning beam of light 1, such as that derived from a flying spot scanner, is controlled to accurately scan the edge 2 of a grating by the use of an oscillating scan.

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Data Reduction System - Fine Scan

A scanning beam of light 1, such as that derived from a flying spot scanner, is controlled to accurately scan the edge 2 of a grating by the use of an oscillating scan.

When the oscillating scan is not centered on the edge of a grating, the signal from a photomultiplier 3 contains a second harmonic frequency component as well as a fundamental frequency component.

These components are passed by filters 4 and compared in phase in a phase detector 5 to provide error signals. Since the phase of the second-harmonic component is dependent upon the direction of error, the error signals are then used to correct the scan.

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