Browse Prior Art Database

Translational Refractometer

IP.com Disclosure Number: IPCOM000091788D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Marinace, JC: AUTHOR

Abstract

Light ray 1 is reflected from front surface 3 of planar mirror 5 at an arbitrary fixed angle omega. The original position of mirror 5 is indicated by dashed line 7 and the reflected light ray is indicated by 1'. Planar transparent sample 9 having a thickness t is positioned against mirror 5 so that reflected light ray 1' is displaced from its original position. Mirror 5 and sample 9 are moved in a direction perpendicular to the plane of mirror 5 for a distance d until reflected light ray 1' coincides with its original position as shown. The index of refraction n(1) of sample 9 is calculated by the expression (Image Omitted)

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Translational Refractometer

Light ray 1 is reflected from front surface 3 of planar mirror 5 at an arbitrary fixed angle omega. The original position of mirror 5 is indicated by dashed line 7 and the reflected light ray is indicated by 1'. Planar transparent sample 9 having a thickness t is positioned against mirror 5 so that reflected light ray 1' is displaced from its original position. Mirror 5 and sample 9 are moved in a direction perpendicular to the plane of mirror 5 for a distance d until reflected light ray 1' coincides with its original position as shown. The index of refraction n(1) of sample 9 is calculated by the expression

(Image Omitted)

Alternatively, changes in the index of refraction or thickness t along the length of an elongated transparent sample can be continuously monitored. With mirror 5 in a fixed position, sample 9 is displaced horizontally along the face of front surface 3 of mirror 5. Displacement of reflected light ray 1' indicates a change in index of refraction n(1) or thickness t of sample 9, e.g., indicative of stored information. The displacement of reflected light beam 1' can be recorded to indicate information stored on sample 9.

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