G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 1/76 (2006.01) B66B 1/34 (2006.01) G01S 11/14 (2006.01)
Patent
CA 2296656
The invention relates to an apparatus for detecting the position of an object moveable along a predetermined travel path, comprising: an acoustic signal conductor extending along the travel path and having a predetermined, uniform speed of propagation of sound; a signal input coupler located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, a signal extractor being arranged at one end of the acoustic signal waveguide and 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 extractor and for generating a signal representative of the instantaneous position of the moveable object on the travel path, wherein at least one sensor actuatable by being passed over by the movable object is arranged at a predetermined distance from the middle of the acoustic signal conductor and is coupled to the evaluation unit, which in accordance with an error polynomial whose coefficients are derived from errors, compensates errors of calibration points along the travel path, the respective error assigned to a specific distance of the travel path being yielded by evaluating the pulse emitted by the sensor assigned to the distance upon being passed over by the movable object.
K.a. Schmersal Gmbh & Co.
Sim & Mcburney
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