dToF sensor enhances 3D spatial detection

The TMF8829 dToF sensor from ams OSRAM has revolutionized distance sensing technology by significantly increasing resolution from the previously standard 8×8 zones to an impressive 48×32. This direct Time-of-Flight (dToF) sensor is designed to detect subtle spatial differences and distinguish closely spaced or slightly varied objects with remarkable precision.

For instance, the dToF sensor can differentiate between an espresso cup and a travel mug placed under a coffee machine, ensuring the correct amount is dispensed every time. This level of accuracy is crucial for a wide range of applications, from logistics robots identifying nearly identical packages to camera systems maintaining focus on moving objects in dynamic video scenes.

David Smith, Product Marketing Manager at ams OSRAM, highlights the versatility of the new dToF sensor, stating, “The new dToF sensor supports precise 3D detection and differentiation in diverse applications — without a camera and with stable performance across varying targets, distances, and environmental conditions.”

New benchmark for dToF sensor technology

The dToF sensor operates by emitting infrared light pulses and calculating the distance to an object based on the reflections of these pulses, similar to how echo delay indicates distance. By utilizing multi-zone technology, the sensor captures reflected light from multiple viewing angles, enabling the creation of detailed 3D depth maps akin to a network of echo points.

The TMF8829 sets a new standard by dividing its field of view into up to 1,536 zones, a significant enhancement over the 64 zones in standard 8×8 sensors. This increased resolution allows for finer spatial detail, supporting applications such as people counting in smart lighting systems, object detection in robotics, and intelligent occupancy monitoring in building automation.

Despite its high resolution, the TMF8829 is impressively compact, measuring just 5.7 × 2.9 × 1.5 mm — thinner than a cent coin and more space-efficient than traditional sensors with lower resolution. Operating without a camera, it is ideal for privacy-sensitive applications. When combined with a camera, the sensor enables hybrid vision systems like RGB Depth Fusion for AR applications.

As a Class 1 eye-safe device, the TMF8829 utilizes a dual VCSEL light source to measure distances up to 11 meters with 0.25 mm precision, making it sensitive enough to detect subtle movements. With its 48×32 zones, the sensor covers an 80° field of view, providing depth information comparable to that of a wide-angle lens. On-chip processing reduces latency and simplifies integration, ensuring stable performance even in challenging conditions.