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US 2025/0308355 A1Published application
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 radiation at an infrared sensor;
- generating, with the infrared sensor, sensor data based on the radiation;
- determining whether an entity has passed the infrared sensor by analyzing the sensor data, including:
- 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;
- and
- determining a direction of travel of the entity.
5 more elements
A device, comprising:
- a sensor;
- an obstruction that asymmetrically inhibits a transmission of infrared radiation to the sensor, wherein the sensor generates sensor data based on the infrared radiation;
- and
- a control circuit configured to determine whether an individual has passed in front of the sensor, and a direction of travel of the individual, by analyzing the sensor data.
1 more element
A method, comprising:
- generating sensor data based on radiation received at a sensor;
- determining whether an entity has passed in front of the sensor by analyzing the sensor data;
- and
- determining a direction of travel of the entity, including:
- detecting a peak in the sensor data;
- comparing a first portion of the sensor data before the peak to a second portion of the sensor data after the peak;
- and
- determining the direction of travel based on an asymmetry between the first portion and the second portion of the sensor data.
5 more elements
Dependencies are inferred from the claim text.