Highly stable thermocouple temperature measurement amplifier circuit composed of OP07

OP07 has low drift (maximum voltage drift 25 vV, maximum temperature drift 0.6pcV/C), low noise (maximum
0.6v/C), ultra-stability (maximum 0.6pLV gate C.month), and wide
power supply voltage range (t3~±18V) high-performance operational amplifier. The highly stable thermocouple temperature measurement amplification circuit
    composed of OP07 is shown in the figure. '     Since R3/Rl=R4/R2, OP07 constitutes a differential amplifier . The temperature measurement part is a "temperature measurement" thermocouple and a "reference" thermocouple . The latter is placed in the environment and the former is placed on the object to be measured. The temperature change on the " temperature measuring " thermocouple is converted into thermoelectric potential, which is amplified and then outputs a voltage.