| 摘要 |
The invention relates to an apparatus for detecting the position of an object which can move along a predetermined path, comprising an acoustic signal waveguide which extends along the path and has a predetermined, uniform speed of propagation of sound, and a signal input coupler, which is located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, at least one signal output coupler at one end of the acoustic signal waveguide and each being connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the signal output coupler and for generating a signal representative of the instantaneous position of the moveable object on the path, wherein the signal input coupler couples in, as acoustic signal, synchronization pulses with a clock period which is greater than the time of propagation of sound from one end of the path to the other, and a large number of additional pulses in between.
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