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Browse Prior Art Database

Optical Flare Measurements

IP.com Disclosure Number: IPCOM000051313D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Harrison, RW: AUTHOR

Abstract

Selectively filtered light from a remotely illuminated cavity steps across an optical plane viewed by a sensor through an optical system. Plots of the sensed flux values quantify the optical system's flare properties.

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Optical Flare Measurements

Selectively filtered light from a remotely illuminated cavity steps across an optical plane viewed by a sensor through an optical system. Plots of the sensed flux values quantify the optical system's flare properties.

Optical flare, which spills light areas on an object plane onto dark areas, makes precise light flux measurements of small object plane areas inaccurate and incapable of being correlated among different optical systems. This test measures flare contribution and illumination separately by illuminating only small defined areas of the object plane.

A light source 7 illuminates a cavity 3 in an opaque body 2 through an optical fiber bundle 4 and filter 6. Baffle 5 shields aperture 1 from direct illumination, reflection from the cavity surfaces illuminating a small area on the object plane defined by the aperture.

The test source 8 illuminates object plane areas centered on and including a desired test area. A photosensor reads and records the light flux for each area seen through the optical system. As the test source nears the test area, neutral density filters reduce the source light flux by calibrated amounts to keep the readings from saturating. This procedure plots the optical system aperture function so precisely that it shows the system's flare contribution outside the test area.

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