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Browse Prior Art Database

Operator-Safe Infrared Light Source

IP.com Disclosure Number: IPCOM000047050D
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Selander, RK: AUTHOR [+2]

Abstract

Infrared light sources are often required in the design of material recognition systems. Disclosed herein is a high flux infrared light source which uses a conventional tungsten halogen lamp and protects the operator from exposure to ultraviolet light. Referring to the figure, a 150-watt tungsten halogen lamp 1 is built into the back end of an ellipsoidal reflector 2 on a slide mechanism 3 that allows focussing. As the converging light moves towards the target plane 4, it impinges upon the surface of a dichroic beam splitter 5 which is designed to pass infrared light and reflect visible and ultraviolet light at a 90Πangle to the incident light, where it impinges upon absorbing plate 6. The throughput infrared light has a small percentage of red visible light with it to aid in optical alignment of the system.

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Operator-Safe Infrared Light Source

Infrared light sources are often required in the design of material recognition systems. Disclosed herein is a high flux infrared light source which uses a conventional tungsten halogen lamp and protects the operator from exposure to ultraviolet light. Referring to the figure, a 150-watt tungsten halogen lamp 1 is built into the back end of an ellipsoidal reflector 2 on a slide mechanism 3 that allows focussing. As the converging light moves towards the target plane 4, it impinges upon the surface of a dichroic beam splitter 5 which is designed to pass infrared light and reflect visible and ultraviolet light at a 90OE angle to the incident light, where it impinges upon absorbing plate 6. The throughput infrared light has a small percentage of red visible light with it to aid in optical alignment of the system. The power supply for lamp 1 can be tuned in current to optimize the color temperature of lamp 1. The entire system is enclosed in enclosure 7.

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