Ultrasonic pulse-echo ranging device

摘要

An ultrasonic pulse-echo ranging device includes a piezo-electric transducer, a transmitter, a receiver, a first transformer having a primary winding coupled to an output of the transmitter and a secondary winding connected to the transducer, and a second transformer having a primary winding coupled to an input of the receiver and a secondary winding connected to the transducer, where the secondary windings of the first and second transformers are in series with the transducer, a first switching element is parallel with the primary winding of the first transformer and controlled to short-circuit this primary winding when the receiver receives the signals from the transducer, and where a second switching element is parallel with the primary winding of the second transformer and controlled to short-circuit this primary winding of when the transmitter drives the transducer to optimize the signal transfer to and from the piezo-electric transducer.

主权项

1. An ultrasonic pulse-echo ranging device comprising:
a piezo-electric transducer configured to emit ultrasonic waves to a target and to receive echo waves reflected by the target; a transmitter having an output for driving the transducer; a receiver having an input for receiving signals from the transducer; a first transformer having a primary winding coupled to the output of the transmitter and a secondary winding connected to the transducer; a second transformer having a primary winding coupled to the input of the receiver and a secondary winding connected to the transducer, the secondary windings of the first and second transformers being in series with the transducer; a first switching element arranged in parallel with the primary winding of the first transformer, said first switching element being controlled to short-circuit the primary winding of the first transformer when the receiver is receiving the signals from the transducer; and a second switching element arranged in parallel with the primary winding of the second transformer, said second switching element being controlled to short-circuit the primary winding of the second transformer when the transmitter is driving the transducer.