SELF-TESTING METHOD OF ULTRASONIC SENSOR AND ULTRASONIC SENSOR WITH SELF-TESTING FUNCTION

摘要

PURPOSE: To provide a self-testing method of an ultrasonic sensor, in which the function of the sensor can be confirmed even when reflected waves from an object are not received. ;CONSTITUTION: A transmission voltage A is given to a reception circuit 6 from a transmission circuit 3 which forms the transmission voltage. The level of an output voltage A' from the reception circuit 6 on the basis of the input of the transmission voltage A is judged by a level judgment circuit 14. Thereby, whether an ultrasonic sensor is normal or not is judged.;COPYRIGHT: (C)1996,JPO