Active infrared motion detector and method for detecting movemen

Details Active infrared motion detector and method for detecting movemen Active infrared motion detector and method for detecting movemen

1987-12-31

1990-01-23

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503383, 340567, G01J 524

Patent

active

048960390

ABSTRACT:
A miniature active infrared motion detector contains a self-heating temperature sensitive resistor, an electronic circuit to maintain temperature of that resistor at predetermined constant level which is higher than ambient temperature. The detector actively radiates thermal energy to environment and measures electric power required to generate that energy. This provides information about temperature variations in surrounding objects. The detector is also comprised of a focusing system, image distortion means and a threshold circuit. An optical system can be made of a curved Fresnel lens or curved mirror, such as parabolic, cylindrical, spherical, etc. which distributes thermal radiation over narrow or wide field of view, potentially up to 360.degree.. The method of detecting movements is based on the use of a warm sensor whose temperature is maintained constant and above ambient.

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patent: 4769545 (1988-09-01), Fraden

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