Circuit for measuring the rate of a series of events by event interval response
Abstract
Abstract A CIRCUIR IS DISCLOSED FOR MEASURING RELATIVELY SLOW RATES OF EVENTS BY MEASURING THE INTERVAL BETWEEN PULSES REPRESENTATIVE OF EVENTS. A TRANSDUCER IS MADE TO PROVIDE A PULSE FOR EACH EVENT OF A SERIES WHICH PULSES ARE UTILIZED TO DRIVE A SWITCH WHICH IS CONNECTED TO ALTERNATELY CHARGE AND DISCHARGE A PAIR OF CAPACITORS FROM A VOLTAGE SUPPLY. THE VOLTAGE LEVEL ON A GIVEN CAPACITORS IS PROPORTIONAL TO THE INTERVAL BETWEEN PULSE AND THUS EVENTS AND THIS LEVEL IS MAINTAINED ON A GIVEN CAPACITOR TO PROVIDE A RATE OUTPUT INDICATION WHILE THE OTHER CAPACITOR IS BEING CHARGED WITH SWITCHING BETWEEN CAPACITORS TIMED BY PULSES DEFINING THE IMMEDIATELY NEXT INTERVAL TO OCCUR TO ASSURE AN IMMEDIATE RESPONSE. THE RC TIME CONSTANT CONTROLLING THE CHARGING RATE OF EACH CAPACITOR IS MADE TO BE GREATER THAN THE INTERVAL BETWEEN PULSES FOR THE SLOWEST RATE OF EVENTS TO BE MEASURED BY THE CIRCUIT.
Inventors
- 👤 Lawrence Grebe Wiley
Bibliographic Details
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