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US 12,367,745 B2Granted
Passive infrared sensor with patterned lens
AssigneeSTMicroelectronics S.r.l.
InventorsEnrico Rosario Alessi, Fabio Passaniti, Antonella Licciardello, Daniele Baldacchino
Life of this patent
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Abstract
A sensor device includes a passive infrared sensor, a control circuit, and a lens that directs infrared radiation onto the passive infrared sensor. The lens includes an obstruction that asymmetrically blocks transmission of infrared radiation through the lens. The control circuit is configured to determine the direction of crossing of individuals passing in front of the sensor device based on sensor signals from the passive infrared sensor.
Claims20
A method, comprising:
- receiving, via an asymmetrically obstructed lens, infrared radiation at a passive infrared sensor;
- generating, with the passive infrared sensor, sensor data based on the infrared radiation;
- determining whether or not an individual has passed in front of the passive infrared sensor by analyzing the sensor data;
- and
- if an individual has passed in front of the passive infrared sensor, determining a direction of travel of the individual, wherein analyzing the sensor data includes:
- detecting an intensity peak in the sensor data;
- and
- comparing a first portion of the sensor data preceding the intensity peak to a second portion of the sensor data succeeding the intensity peak.
5 more elements
A device, comprising:
- a passive infrared sensor;
- a lens positioned to direct infrared radiation onto the passive infrared sensor;
- an obstruction that asymmetrically inhibits a transmission of the infrared radiation though the lens, wherein the passive infrared sensor generates sensor data based on the infrared radiation;
- and
- a control circuit configured to determine whether or not an individual has passed in front of the passive infrared sensor, and a direction of travel of the individual, by analyzing the sensor data, wherein the control circuit includes an analysis model trained with a machine learning process to determine whether or not an individual has passed in front of the passive infrared sensor, and a direction of travel of the individual, by analyzing the sensor data.
2 more elements
A method, comprising:
- placing, on a lens, an obstruction that asymmetrically inhibits a transmission of infrared radiation through the lens;
- coupling the lens to a passive infrared sensor;
- directing infrared radiation onto the passive infrared sensor with the lens;
- generating sensor data with the passive infrared sensor based on the infrared radiation;
- and
- determining a direction of a travel of an individual based on asymmetries in the sensor data.
3 more elements
Dependencies are inferred from the claim text.