Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1989-08-28
1991-06-25
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250353, G08B 1318
Patent
active
050269909
ABSTRACT:
Apparatus and a method for previewing the field of coverage of an infrared sensor and, accordingly, adjusting its position for use in an intrusion detection alarm system. A mirror can be mounted in place of the infrared sensor and has indicia corresponding to beams of sensitivity of the infrared sensor to provide an indication of the beams of sensitivity superimposed on an image reflected by the mirror to aid in adjusting the position of the infrared sensor. Alternatively, or as verification of the sensor position, a photograph can be prepared by use of a camera located in a proposed infrared sensor position. Directional beams of sensitivity of the infrared sensor are plotted on the photograph by the use of a prepared transparent overlay showing the correspondence between areas of the photograph and respective elements of the lens of the infrared sensor. Portions of the sensor lens are masked to block reception of infrared radiation from known sources along beams of sensitivity of the infrared sensor.
REFERENCES:
patent: 4551711 (1985-11-01), Akiyama et al.
patent: 4642454 (1987-02-01), Carlson
Marman Douglas H.
Winters Robert C.
Fields Carolyn E.
Sentrol, Inc.
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