System for improving measurement accuracy of transducer by measuring transducer temperature and resistance change using thermoelectric voltages

A constant current loop measuring system, comprising:

• a sensor experiencing a temperature and a resistance change responsive to an external condition being measured;
• thermocouple conductors connected to said sensor, sensing first and second induced voltages responsive to the external condition;
• current generating and reversing means for generating a constant current, and for supplying said constant current to said thermocouple conductors in forward and reverse directions generating first and second measured voltages, each of said first and second measured voltages including said first and second induced voltages;
• and
• determining means for receiving said first and second measured voltages from said current generating and reversing means, and for determining said temperature and said resistance change of said sensor responsive to said first and second measured voltages.

A method for measuring a property including a temperature of a sensor responsive to an external condition being measured using a constant current loop measuring system, comprising the steps of:

• (a) sensing first and second induced voltages responsive to the external condition using thermocouple conductors;
• (b) generating and supplying a constant current to the thermocouple conductors in forward and reverse directions generating first and second measured voltages, each of the first and second measured voltages including the first and second induced voltages sensed in said sensing step (a);
• and
• (c) determining the temperature of the sensor responsive to the first and second measured voltages generated in said generating step (b).

A method for measuring a property including a temperature and a resistance change of a sensor responsive to an external condition being measured using a constant current loop measuring system, comprising the steps off:

• (a) introducing the external condition to the sensor;
• (b) sensing first and second induced voltages responsive to the external condition using thermocouple conductors;
• (c) generating and supplying a constant current to the thermocouple conductors in forward and reverse directions generating first and second measured voltages, each of the first and second measured voltages including the first and second induced voltages sensed in said sensing step (b);
• and
• (d) determining the temperature and the resistance change of the sensor responsive to the first and second measured voltages generated in said generating step (c).