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Detector for Ultraviolet Radiation

IP.com Disclosure Number: IPCOM000048055D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Clarke, TC: AUTHOR [+3]

Abstract

Polyacetylene, (CH)(x), films impregnated with triphenylsulfonium or diaryliodonium salts can be used for ultra-violet actinometry. Such films undergo predictable increases in conductivity on exposure to ultraviolet (UV) radiation in the 250-350 nm range. For a given concentration of salt in the (CH)(x) film, the increase in film conductivity is a direct and reproducible measure of the integrated exposure to ultraviolet radiation. With suitable calibration the ultra-violet exposure can thus be measured quickly and cheaply using the standard techniques for conductivity measurement. As opposed to chemical actinometry, this method is also particularly sensitive in the low exposure regime.

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Detector for Ultraviolet Radiation

Polyacetylene, (CH)(x), films impregnated with triphenylsulfonium or diaryliodonium salts can be used for ultra-violet actinometry. Such films undergo predictable increases in conductivity on exposure to ultraviolet (UV) radiation in the 250-350 nm range. For a given concentration of salt in the (CH)(x) film, the increase in film conductivity is a direct and reproducible measure of the integrated exposure to ultraviolet radiation. With suitable calibration the ultra- violet exposure can thus be measured quickly and cheaply using the standard techniques for conductivity measurement. As opposed to chemical actinometry, this method is also particularly sensitive in the low exposure regime. Since the impregnated salts are insensitive to radiation in the visible region, no interference would be caused in these measurements by accompanying visible radiation. In addition to directly measuring the integrated intensity of UV radiation, one can use other configurations of this device for specialized applications. For example, the incorporation of a treated polyacetylene film in a suitable electrical bridge circuit can be used to trigger an alarm or some other signal when the exposure of the film to UV reached some predetermined level. In particular, we have used this approach to measure the ultra-violet component of solar radiation. With suitable calibration this technique can provide an inexpensive approach to measuring the solar radiati...