Thermopile Sensor Circuit

The thermopile sensor consists of a series of 116 thermoelements forming a sensitive region size of 545 µm diameter.

Thermopile sensor circuit. 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 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 reference sensor is designed into the package as a reference for compensation.

The sensor is hermetically sealed into a to 5 metal. Cross section through a thermopile sensor showing all relevant parts table 1. 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. The circuit itself seems to add about 0 6mv to the thermopile raw reading.

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. 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.