OPTICALLY COUPLED REMOTE SENSOR APPARATUS AND SYSTEM

摘要

18 54,013 An optically coupled remote sensor apparatus comprises a tuned circuit incorporating a sensor and a light emitting diode (LED) connected in parallel with the tuned circuit. The natural resonant frequency of the tuned circuit is determined by the sensor whose electrical parameter is a function of the condition to be sensed. The sensed condition correlates to a frequency of light pulses emitted from the LED, which light pulses are only emitted when the pulsed light source frequency coincides with the natural resonant frequency of the tuned circuit.