Fluidic temperature sensing systems
Abstract
Abstract THE DISCLOSURE SHOWS A FLUIDIC TEMPERATURE SENSING SYSTEM WHICH COMPRISES TWO FLUIDIC TEMPERATURE SENSORS CONNECTED TO A COMMON FLUID SOURCE. FLOW OF FLUID THROUGH THE SENSORS PROVIDES OUTPUT SIGNALS HAVING PRESSURE VARIATIONS, THE FREQUENCY OF WHICH IS PROPORTIONATE TO FLUID TEMPERATURE. WHEN THERE IS A STEP CHANGE IN TEMPERATURE, THE DIFFERENCE IN FREQUENCY BETWEEN THE TWO SIGNALS, AT THE END OF THEIR SHORT TERM TIME CONSTANTS, ACCURATELY REFLECTS THE ACTUAL CHANGE IN FLUID TEMPERATURE BEFORE EITHER SENSOR HAS REACHED A STEADY STATE CONDITION, REFLECTION THE TEMPERATURE CHANGE. ALSO THE RATES OF CHANGES OF THE SENSORS DURING THEIR SHORT AND LONG TERM TIME CONSTANTS MAY BE SET TO GENERATE A TEMPERATURE FUNCTION SIGNAL AND PROVIDE A LEADING RELATIONSHIP IN WHICH THE FREQUENCY DIFFERENCE AT THE EXPIRATION OF THE SHORT TERM TIME CONSTANTS IS GREATER THAN AT THE NEW STEADY STATE CONDITIONS. A FLUIDIC BEAT DETECTOR PROVIDES AN OUTPUT SIGNAL PROPORTIONATE TO THE DIFFERENCE IN FREQUENCY OF THE TWO SENSOR SIGNALS. THIS OUTPUT SIGNAL IS EMPLOYED TO PROVIDE AN ANALOGUE READOUT HAVING A MINIMUM RESPONSE TIME.
Inventors
- 👤 Willis A Boothe
- 👤 William L Phipps
Bibliographic Details
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