Thermopile Sensor Circuit

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

Thermopile sensor circuit.

The sensor reads the temperature over the entire area it sees. I account for this in the sketch with a constant called verr. 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. The thermopile sensor consists of a series of 116 thermoelements forming a sensitive region size of 545 µm diameter.

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. If the open circuit test reads below 400 millivolts then the thermopile likely requires service or replacement. Thermopile infrared ir non contact temperature measurement sensors are available with various lens and filters allowing use in multiple applications from industrial pyrometers to climate controls and medical devices.

A reference sensor is designed into the package as a reference for compensation. A healthy thermopile in an open circuit test will read between 650 to 850 millivolts or somewhere in between. The circuit itself seems to add about 0 6mv to the thermopile raw reading.