| 摘要 |
A data interface for a railcar truck assembly, to transmit the outputs of transducers located on the rotating axle to circuits on the stationary frame of the truck. The data transmission system includes a group of several light emitting elements located on the axle and angularly spaced thereabout, and with all elements driven simultaneously at a high frequency to produce modulated light representing data. A light sensitive cell on the frame receives the light, to generate a signal which passes through a high-pass filter and is demodulated or demultiplexed to provide an output representing the transducer signals on the rotating axle. The photocell is spaced far enough from the axle, that it is outside the circle of interrupted illumination, so that the photocell is always within the half power beam of at least one of the light emitters on the axle. An auxiliary optical transmitter is located on the frame, and emits light to a group of auxiliary photocells on the axle, to provide mode control data feed back to the axle to operate the power supply and signal processing circuitry on the axle.
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