such as measurement of a car in a room or control of a welding structure, more receivers can be used. In the presence of temperature differences, the probe can be equipped with a temperature sensor to report its temperature to the receiver. The ultrasonic transducers used in this project are of the piezoelectric type. The effective travel distance of the transmitter is proportional to the trigger voltage. In this case, the amplitude of the generated ultrasonic signal also increases with trigger voltage