Arrangement in order to prevent false alarms of a passive infrar

Details Arrangement in order to prevent false alarms of a passive infrar Arrangement in order to prevent false alarms of a passive infrar

1980-06-09

1981-12-22

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340587, 340600, 340693, G08B 1318

Patent

active

043073883

ABSTRACT:
In an infrared motion alarm an optical filter arranged in front of an input of an infrared detector is attached to a heat sink in the form of a solid metal crucible in order to reduce the sensitivity to glass-penetrating electromagnetic radiation. Changes in radiation absorbed in the optical filter are either captured in the thermal sink or decelerated at least as to the characteristic thermal radiation of the optical filter and no longer fall within the characteristic range of change of the motion alarm.

REFERENCES:
patent: 3703718 (1972-11-01), Berman

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