| 摘要 |
A transducer arrangement and method that generates control signals indicating relative positions of the ends of a hydraulically movable screed head. The generated control signals of the present invention are used by a conventional control circuit controlling the hydraulically movable screed head with laser receivers in a column block situation, which interrupts the reception of a laser beam from a laser transmitter by one of the laser receivers, to provide an estimated absolute position of the interrupted receiver side of the screed head until the column block situation clears. Normally, absolute measurements are available on both sides of the screed head via the laser receivers receiving the laser beam. The transducer arrangement of the present invention provides an additional control signal that in a column blocked situation the control system uses to maintain a relative elevation position of the interrupted receiver side to the absolute position of the uninterrupted receiver side until both receiver can reacquire the elevational reference of the laser transmitter.
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