Electrical resistance bridge with a heat sensitive resistor for the measurement of the thermal dispersion within the ambience of the resistor

Abstract

Abstract AN ELECTRIC RESISTANCE BRIDGE CIRCUIT, INCLUDING A MAIN BRIDGE AND AN AUXILIARY BRIDGE, THE MAIN BRIDGE INCLUDING A TEMPERATURE SENSITIVE REFERENCE RESISTOR ADAPTED TO BE INFLUENCED BY ITS AMBIENCE IN A NORMAL OR REFERENCE STATE, A TEMPERATURE SENSITIVE SENSING RESISTOR ADAPTED TO BE INFLUENCED BY ITS AMBIENCE IN A STATE DIFFERING FROM SAID NORMAL OR REFERENCE STATE, AND A BRIDGE RESISTOR IN SERIES WITH SAID SENSING RESISTOR. THE REFERENCE RESISTOR IS ARRANGED IN ONE ARM OF SAID MAIN BRIDGE, AND THE SENSING AND THE BRIDGE RESISTORS ARE ARRANGED IN ANOTHER ARM OF SAID MAIN BRIDGE, AN AMPLIFIER IS INCLUDED, THE INPUT OF WHICH IS CONNECTED TO THE OUTPUT OF THE MAIN BRIDGE, A RECORDING INSTRUMENT IS CONNECTED TO RECEIVE AS ITS INPUT SIGNAL A SIGNAL DERIVED FROM THE OUTPUT OF THE AMPLIFIER, THE OUTPUT OF THE AMPLIFIER BEING CONNECTED TO DIAGONALLY OPPOSITE POINTS O SAID AUXILIARY BRIDGE, THE AUXILIARY BRIDGE HAVING ONE OF ITS ARMS FORMED BY SAID SENSING RESISTOR AND ANOTHER OF ITS ARMS FORMED BY THE BRIDGE RESISTOR, ONE OF THE DIAGONALLY OPPOSITE POINTS BEING THE POINT OF JUNCTION BETWEEN THE SENSING RESISTOR AND THE RIDGE RESISTOR, WHEREBY ANY IMBALANCE SIGNAL IN THE MAIN BRIDGE IS AMPLIFIED BY THE AMPLIFIER AND THE RESULTING OUTPUT SIGNAL CURRENT THEREFROM IS DIVIDED INTO A COMPENSATING CURRENT THROUGH SAID SENSING RESISTOR, AND A CURRENT THROUGH SAID BRIDGE RESISTOR, THUS KEEPING THE TOTAL VOLTAGE ACROSS THE SERIES CONNECTION OF THE SENSING RESISTOR AND THE BRIDGE RESISTOR AS WELL AS THE CURRENT THROUGH THE REFERENCE RESISTOR SUBSTANTIALLY CONSTANT.

Inventors

• 👤 Mogens Oppegaard

Bibliographic Details