Ultrasonic pulse echo detector e.g for collision prevention in driverless vehicle - has functional monitoring transducer which evaluates pulse emitted by working transducer and returns standard pulse to it for amplitude check

摘要

The working transducer (1) directs ultrasonic waves at an angled surface (2) from which they are reflected (4) in a generally horizontal direction. The surface inclined at pref. 45 deg. carries the monitoring transducer (3) whose response is processed by electronic circuitry for a check on the size of the received pulse. After all echo signals have been read, the monitoring transducer itself radiates a pulse of defined size back to the working transducer which checks on its sufficiency. USE/ADVANTAGE - For contactless distance measurement in air and gas, the monitoring transducer always lies sufficiently within the acoustic field of the working one, without adverse effect on it.