Chopped Passive Infrared Sensor Apparatus and Method for Stationary and Moving Occupant Detection


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

Patent Status

Patent application submitted

Stage Of Development


Licensing Potential

Licensing,Commercial partner,Development partner

Licensing Status

Available for licensing

Additional Info Header image is purely illustrative. Source: Wikimedia/CHG,, public domain.
Patent Information:
Case ID: R050-8893
For Information, Contact:
Donna Tumminello
Assistant Director
State University of New York at Stony Brook
Haili Liu
Ya Wang
Kevin Wang