1. Ultrasonic sensors , which emit high-frequency sound waves, are one technology under consideration.2. As your car enters the garage, an ultrasonic sensor activates a green light. 3. There are front and rear ultrasonic sensors to sense the obstacles. 4. Ultrasonic sensors can be designed to provide point level control, continuous monitoring or both.5. In its base is a crescent-shaped array of ultrasonic sensors that scan the area ahead. 6. Passive ultrasonic sensors are basically microphones that detect ultrasonic noise that is present under certain conditions. 7. The system detects the location of trains on the guideway by the use of ultrasonic sensors . 8. Its ultrasonic sensors allow it to come within 1 " of objects without colliding with them. 9. The hardware includes eight surround cameras and twelve ultrasonic sensors , in addition to the forward-facing radar. 10. These systems use either electromagnetic or ultrasonic sensors .
