The ultrasonic sensor in reflective mode (proximity switch) represents the classic method of operation. It exploits its background interference suppression which is superior to other sensing principles. Here, the switch is activated as soon as the target is located within the preset detect point. The detect point is coupled with a hysteresis. This operating mode is suitable for, e.g. counting items on a conveyor belt or for presence detection. The overview table for distance measurement sensors lists all the sensor types that can work in reflective mode.
