Radar Sensor Frequently Asked Questions

An adjustable field (diffuse) radar sensor can detect vehicles and other objects by sensing the reflection of the radio waves bouncing off the object. Optimal targets include:

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• Large metallic objects that reflect a lot of radio waves, a property referred to as a large &#;radar cross section.&#; 
• Objects that have surfaces that are perpendicular to the radar beam pattern to reflect the radio signal directly back to the sensor. 

Adjustable field radar sensors have configurable &#;set-point distances,&#; where the sensor will use the time between emitted pulse and reflected signal detection to calculate how far away a sensed object is from the sensor and only turn the output on when the object is within the set-point distance. 

A retro-reflective radar sensor uses a taught reference condition like a wall, floor, or special retro-reflective target. The sensor detects objects between it and the reference target by looking for disruptions in the signal coming back from the reference target. 

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This type of sensing can sense objects even if they do not have a good radar cross section, but they must block the signal reflection from the reference target. This makes retro-reflective radar sensors the most robust radar sensing option. 

The QT50R has a separate retro-reflective model, however any T30R sensor can be configured as a retro-reflective sensor by setting a distance window around a reference target.

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