Method for operating an ultrasonic sensor, and corresponding ultrasonic sensor

1. A method for operating an ultrasonic sensor ( 22 ) in duplex mode, the method comprising:

transmitting a transmission trigger to the ultrasonic sensor via a first duplex channel at a multiple of a resonance frequency of an ultrasonic converter in the ultrasonic sensor for triggering an acoustic transmitted signal;

dividing down the transmission trigger in the ultrasonic sensor; and

transmitting at least one electrical received signal corresponding to the acoustic transmitted signal from the ultrasonic sensor via a second duplex channel at the resonance frequency of the ultrasonic converter in the ultrasonic sensor.

2. The method of claim 1 , further comprising:

impressing the at least one electrical received signal using a current source.

3. The method of claim 2 , further comprising:

receiving the at least one electrical received signal using a low-resistance detector.

4. The method of claim 1 , wherein the transmission trigger is impressed on the line by a voltage source.

5. The method of claim 4 , further comprising:

receiving the transmission trigger using a high-resistance detector.

6. The method of claim 1 , further comprising:

varying the pulse duty factor of the transmission trigger for further transmission of information.

7. The method of claim 6 , further comprising:

transmitting information concerning a desired transmission current level.

8. The method of claim 1 , wherein a transmission current which is proportional to the transmission acoustic pressure is used.

9. An ultrasonic sensor, comprising:

a receiver to receive a transmission trigger for triggering an acoustic transmitted signal via a first duplex channel at a multiple of the resonance frequency of an ultrasonic converter in the ultrasonic sensor;

a divider to divide down the transmission trigger; and

a transmitter to transmit at least one electrical received signal corresponding to the acoustic transmitted signal via a second duplex channel at a resonance frequency of an ultrasonic converter in the ultrasonic sensor.

10. The ultrasonic sensor of claim 9 , wherein the first duplex channel transmits the transmission trigger in a voltage-driven manner.

11. The ultrasonic sensor of claim 10 , wherein the receiver has a high-resistance detector for receiving the transmission trigger.

12. The ultrasonic sensor of claim 9 , wherein the transmitter has a current interface for a current-driven transmission of the electrical received signal.

13. A device for controlling an ultrasonic sensor, comprising:

a transmitter to transmit a transmission trigger for triggering an acoustic transmitted signal to an ultrasonic sensor via a first duplex channel at a multiple of a resonance frequency of an ultrasonic converter in the ultrasonic sensor; and

a receiver to receive the at least one electrical received signal transmitted by the electronic sensor via the second duplex channel at the resonance frequency of the ultrasonic converter in the ultrasonic sensor, the electrical received signal corresponding to the acoustic transmitted signal;

wherein the ultrasonic sensor includes a receiver to receive a transmission trigger for triggering the acoustic transmitted signal via the first duplex channel at the multiple of the resonance frequency of the ultrasonic converter in the ultrasonic sensor, a divider to divide down the transmission trigger, and a transmitter to transmit at least one electrical received signal corresponding to the acoustic transmitted signal via a second duplex channel at a resonance frequency of the ultrasonic converter in the ultrasonic sensor.

14. The device of claim 13 , wherein the second duplex channel transmits the received signal in a current-driven manner.

15. The device of claim 14 , wherein the receiver has a low-resistance detector for receiving the electrical received signal.

16. The device of claim 13 , wherein the transmitter has a voltage interface for providing a voltage-driven transmission of the transmission trigger.