| 摘要 |
A two-part sensor 40A' includes a power source/signal receiver 58A' and a signal generator, 56A' which are physically spaced and disconnected from one another. The power source/signal receiver 58A' is encased within transparent encapsulating material 126 and includes an annular solenoid core 128 with an aperture 130, a coil 132 around the core and photodiode 134 mounted in the aperture. The photodiode 134 detects a modulated light beam received from the signal generator 56A' and produces an output information signal. The solenoid coil 132 produced a fluctuating magnetic field when connected to a power supply 124. The signal generator 56A' is encased within transparent encapsulation material 148 and includes an annular relay core 150 with an aperture 152, a coil 154 around the core, a transducer circuit 142, 149, 146 and an LED 155 mounted within the aperture. The relay coil 154 provides a signal generator supply potential. when positioned within the magnetic field produced by the power source/signal receiver 58A'. The supply potential powers the transducer circuit 142, 144, 146 and the LED 155. The transducer circuit 142, 144, 146 generates a modulated transducer signal as a function of a sensed parameter. The LED 155 is coupled to the transducer circuit 142 144, 146 and produces the modulated light beam as a function of the transducer signal.
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