Measurement circuit of thin-film temperature sensor

A measurement circuit of a thin-film temperature sensor, comprising:

• a first operational amplifier (U1), a second operational amplifier (U2), a potentiometer (R1), a thin-film resistor (Rt), a first resistor (R6), a second resistor (R7), a third resistor (R8), and a fourth resistor (R9), wherein
• an out-phase input end and an output end of the first operational amplifier (U1) are both connected to a first end of the thin-film resistor (Rt);
• a second end of the thin-film resistor (Rt) is connected to a constant current source;
• a first end of the first resistor (R6) is connected to the output end of the first operational amplifier (U1), and a second end of the first resistor (R6) is connected to an in-phase input end of the first operational amplifier (U1);
• the second end of the first resistor (R6) is grounded via the second resistor (R7);
• an output end of the second operational amplifier (U2) is connected to a first end of the potentiometer (R1);
• a second end of the potentiometer (R1) is connected to the constant current source and an in-phase input end of the second operational amplifier (U2) respectively;
• a first end of the third resistor (R8) is connected to the output end of the second operational amplifier (U2), and a second end of the third resistor (R8) is connected to an out-phase input end of the second operational amplifier (U2);
• the second end of the third resistor (R8) is grounded via the fourth resistor (R9);
• the voltage value of the second end of the potentiometer (R1) is an output signal.