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Optical Method Of Measuring Linear Displacement

IP.com Disclosure Number: IPCOM000097879D
Original Publication Date: 1961-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Collins, JV: AUTHOR

Abstract

An objective lens 10 is mounted so that it magnifies the surface 12 which is to be displaced. The image 14 thus formed is read by a high power microscope 16 whose settings are accurately measured. The objective lens 10 is focused on some minute speck of rust, oil spot, etc., provided it has virtually no depth.

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Optical Method Of Measuring Linear Displacement

An objective lens 10 is mounted so that it magnifies the surface 12 which is to be displaced. The image 14 thus formed is read by a high power microscope 16 whose settings are accurately measured. The objective lens 10 is focused on some minute speck of rust, oil spot, etc., provided it has virtually no depth.

Displacement of the surface 12 is observed by the reading microscope 16 as it is brought into focus for each position. The ratio of microscope 16 motion to surface 12 displacement is equal to the square of the lateral magnification in the image plane 14 of the objective lens 10. The settings are then recorded.

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