Method and arrangement for the transmission of useful signals in magnetostrictive position sensors

Claimed are a method and an arrangement for the transmission of useful signals of a magnetostrictive position sensor which is arranged within a housing, including a control circuit (

1) for generating an electrical control pulse, a pulse generator (

2) for exciting current pulses in the ultrasonic exciter circuit (

6), an ultrasonic pulse detector (

3) which upon the reception of an ultrasonic pulse on a magnetostrictive waveguide supplies a corresponding electrical reply signal, and an evaluation circuit (

4) for determining the relative position of a position marking (magnet) which is displaceable along the waveguide. Therein the individual circuits of the electronics of the magnetostrictive sensor are to be supplied by way of a cable which is of thinner cross-section and both control pulses and also reply pulses are to be transmitted as useful signals by way of that cable. That is achieved in that the circuits within the housing are coupled to those outside the position sensor housing by way of a two-pole electrical line on which the supply voltage is superimposed with the respective useful signal.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is described by way of example hereinafter with reference to the figures in which:

FIG. 1 shows a schematic circuit diagram of an arrangement for the bidirectional transmission of pulses by way of a two-pole electrical line,

FIG. 2 shows a more detailed circuit diagram of the arrangement according to the invention in FIG. 1, and

FIG. 3 shows a schematic circuit diagram of a second embodiment of the arrangement according to the invention.

1. A method for the transmission of useful signals of a magnetostrictive position sensor which is arranged within a housing, including the acts of:

2. A method as set forth in claim 1,

3. A method as set forth in claim 1,

4. A method as set forth in claim 1,

5. An arrangement for the transmission of useful signals on the supply potential conductor of a magnetostrictive position sensor which is arranged within a housing, comprising:

6. An arrangement as set forth in claim 5,

7. An arrangement as set forth in claim 5, including impedance units for decoupling the useful signal input and output devices which are coupled to the supply potential conductor of the two-pole electrical line from the supply potential.

8. An arrangement as set forth in claim 7, wherein the impedance units are capacitors.

9. An arrangement as set forth in claim 7, including a decoupling impedances decoupling the supply connections from high-frequency useful signals.

10. An arrangement as set forth in claim 9,

11. An arrangement as set forth in claim 9,

12. An arrangement as set forth in claim 5,

13. A method for the transmission of useful signals of a magnetostrictive position sensor which is arranged within a housing, including the acts of:

14. A method as set forth in claim 13,

15. An arrangement as set forth in claim 14,

16. An arrangement for the transmission of useful signals on the conductor of a magnetostrictive position sensor which is arranged within a housing, comprising:

17. An arrangement as set forth in claim 16, including

18. An arrangement as set forth in claim 17,

19. An arrangement as set forth in claim 17,

20. An arrangement as set forth in claim 16,