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Proceedings Paper

A Visually Secure Infrared Trap Camera
Author(s): D. J. Heywood
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Paper Abstract

A trap camera is an "on demand" surveillance camera, that is left unattended on a premises to photographically record intruders. A survey was made of the requirements of Police groups within the U.K. for such a device and showed that the only acceptable method of imaging, on economic grounds, was to use infr-red electronic flash incorporated in a new design of silent 35mm motor drive camera. An extensive market search indicated that no such camera was in production at the time of the survey. Infra-red light of the wavelength and intensity required to correctly expose Kodak High Speed Infra-Red film can be observed, even at high ambient light levels as a dull red. At near total darkness with the dark adapted eye, the infra-red flash becomes clearly visible. This was not acceptable for a multishot camera. The way in which this problem was overcome is discussed in the paper. Prototype models have been constructed under contract and these are now undergoing field trials. Quantity production by the same company is imminent.

Paper Details

Date Published: 9 November 1977
PDF: 8 pages
Proc. SPIE 0110, Industrial and Civil Applications of Infrared Technology, (9 November 1977); doi: 10.1117/12.955518
Show Author Affiliations
D. J. Heywood, Police Scientific Development Branch (U.K.)

Published in SPIE Proceedings Vol. 0110:
Industrial and Civil Applications of Infrared Technology
W. D. Lawson, Editor(s)

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