Temperature measurement circuit

The electronic thermometer circuit for measuring temperature is shown in the figure. The
sensor is a transistor connected as a diode.
    The temperature measurement range of this circuit is -16-66"C. When
the temperature around the transistor changes, the voltage at both ends changes linearly
(about 0.92mV/℃). After amplification by Al, it is sent to A2. A2 is connected
to an inverting op amp, and the test meter is connected to the feedback loop. Its current is determined by the input
voltage and resistance, network wind, Rs and RP. At -16°C
, adjust RP so that it flows through M and Rs, The wind current is equivalent to
reverse phase. At this time, the ammeter indicates O. When the temperature rises,
the AI ​​output current increases, and the A2 reverse terminal potential U increases. The ammeter
has current flowing through it, and its indicated current is linear with the temperature. Relationship.
Adjust RP so that when T--16tC, the meter indicates OmA, and when T-66°C, the meter indicates ImA. Then divide the indication of ImA into 66
equal parts. In this way, one part represents l4c, which can be read directly Outputs the temperature value.