Movement of objects signalling device - has receiver output connected to pulse generator through RC delay circuit having delay time matched to movements of surveyed objects

摘要

The movement of objects signalling device is operative within the radiation lope of a transmitter. The objects modulate an oscillation received by a receiver which delivers an analogue voltage corresponding to the modulation. This voltage is converted, pref. by a Schmitt trigger, into pulses applied to a counter which delivers a signal after selected number of pulses has been counted. The reference potential terminal of pulse generator (14) is connected through a RC delay circuit (18, 19) to the receiver signal output. The delay time is matched to individual movements of surveyed objects in the transmitter field.