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Chopped Passive Infrared Sensor Apparatus and Method for Stationary and Moving Occupant Detection
Header image is purely illustrative. Source: Wikimedia/CHG,, public domain.


Passive infrared (PIR) sensors are used in a variety of applications. They work by using the pyroelectric effect: a change based on the temperature modifies the positions of the atoms. However, because voltage is generated by pyroelectric materials, conventional PIR sensors are unable to detect stationary objects.


In order to detect stationary objects, new sensors would include a sensing element and a Fresnel lens disposed over a surface of a sensing element. Also included is an optical chopper, thus controlled sensing and control circuitry. The new additions to the sensors will allow stationary objects to be detected.


-Able to detect more objects -More accurate sensing with fewer discrepancies


-Detection -Tracking personal identification -Lighting systems -HVAC


Haili Liu, Postdoctoral Associate, Mechanical Engineering
Ya Wang, Assistant Professor, Mechanical Engineering
Kevin Wang, Ph.D,

Licensing Potential

Licensing,Commercial partner,Development partner

Licensing Status

Available for licensing

Licensing Contact

Donna Tumminello, Assistant Director, Office of Technology Licensing,, 6316324163

Patent Status

Patent application submitted


Tech Id