D ShinFollow


Applications that require sensing presence or motion of people in a given physical area often employ passive infrared (PIR) sensors for these purposes. Commodity PIR sensors lack the spatial resolution to discern the direction of the person’s movement. This disclosure describes a PIR sensor module that incorporates a Fresnel lenslet system based on Barker codes to provide the spatial resolution needed to detect the direction of motion by leveraging the autocorrelation property of Barker codes. Information on the direction of a user’s motion opens up new possibilities for spatially intelligent applications and services.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.