초록 ▼

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 an

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°. The method of detecting movements is based on the use of a warm sensor whose temperature is maintained constant and above ambient.

대표청구항 ▼

An active infrared radiation motion detector for detecting a moving object, said detector comprising: a support body; a first temperature sensitive self-heating resistive means capable of emitting thermal radiation in response to electric power through said resistive means, mounted on said support b

An active infrared radiation motion detector for detecting a moving object, said detector comprising: a support body; a first temperature sensitive self-heating resistive means capable of emitting thermal radiation in response to electric power through said resistive means, mounted on said support body for emitting said thermal radiation for radiating on a region which may include said object; a first electronic control circuit connected to said resistive means for maintaining the resistance of said resistive means at a predetermined value by adjusting electrical power through said resistive means, and for providing a signal indicative of change in said power, said change being indicative of modulation by movement of said object.