Thermopile Sensor Circuit

The sensor must only see the object being measured and nothing else to get an accurate temperature reading.

Thermopile sensor circuit.

I account for this in the sketch with a constant called verr. The temperature of the cold contacts window filter and or lens. A healthy thermopile in an open circuit test will read between 650 to 850 millivolts or somewhere in between. A thermopile is an electronic device that converts thermal energy into electrical energy it is composed of several thermocouples connected usually in series or less commonly in parallel such a device works on the principle of the thermoelectric effect i e generating a voltage when its dissimilar metals thermocouples are exposed to a temperature difference.

The sensor reads the temperature over the entire area it sees. Parts of a thermopile sensor and their function part function thermopile chip sensing element converts radiation into voltage reference sensor measures the temperature of the sensor package i e. A reference sensor is designed into the package as a reference for compensation. R2 5v a1 a3 a2 adder vout c3 r9 r8 c2 thermopile thermopile r1 r7 c1 2 4 r13 r10 r11 r12 5v c4 reference resistor ambient.

Cross section through a thermopile sensor showing all relevant parts table 1. The thermopile sensor consists of a series of 116 thermoelements forming a sensitive region size of 545 µm diameter. The circuit itself seems to add about 0 6mv to the thermopile raw reading.