Smart Building Applications of Lightweight Time-of-Flight Depth Sensors

Monitoring room or building occupancy remotely can be achieved by installing a device which can count how many people have entered the space and how many leave, in real time.

For standard door sizes, utilizing TeraRanger Evo 64px is recommended to monitor and count the flow of people in an indoor space. This works well for standard sized doors, which are usually 80 cm wide and 2 m tall (2'6” by 6'6”).

A people counting algorithm was written as a proof of concept whilst developing the product. You can create your own algorithm upon purchasing a TeraRanger Evo 64px. A sensor was placed above each entry point in order to calculate the number of people entering or leaving. People passing in front of the door but not passing through it are also detected, and they are not included in the count.

The sensors update rate was set at 30 frames per second for people counting, which was ideal for identifying even the quickest moving people. As long as they pass through the sensors 15° field of view, they are counted.

For bigger doors, people counting with Terabee 3Dcam 80 x 60 is also viable, where its 92° diagonal field of view and a higher resolution permit it to cover wider entrances or doors, and reliably count dense and fast-moving people movements in more complex scenarios.

Advantages of Teraranger Evo 64px Over Other Sensor Modules

Evo 64px is a lightweight and compact multi-pixel Time-of-Flight sensor, which was created for indoor use. It has a maximum range of up to 5 meters, and outputs a matrix of 8 x 8 high-speed distance readings over a 15 degree field of view.

Optical depth ToF technology is perfect for indoor applications and is even able to operate in low light and total darkness. The sensors utilize infrared LED which makes them eye safe in all conditions, unlike laser devices. The sensor's matrix output makes it impossible to recognize specific silhouettes or faces, protecting user privacy at all times.

Time-of-flight Depth Sensing Applications

TeraRanger Evo 64px can be employed for a number of smart building applications, including:

  • Gesture recognition
  • Motion tracking
  • Presence and proximity detection
  • People and object counting

This information has been sourced, reviewed and adapted from materials provided by Terabee.

For more information on this source, please visit Terabee.

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