Temperature Sensors

Temperature sensors work by measuring the thermal energy, or heat, that is generated by an object or environment. The most common types of temperature sensors include thermocouples, resistance temperature detectors (RTDs), thermistors, and infrared sensors.

Thermocouples work by measuring the voltage produced when two different metals are connected at both ends. The voltage is proportional to the temperature difference between the two ends, which allows the thermocouple to measure temperature.

RTDs work by measuring the change in electrical resistance of a metal wire as its temperature changes. The resistance of the wire increases as the temperature increases, allowing the RTD to measure temperature.

Thermistors work by measuring a material's electrical resistance change as its temperature changes. Unlike RTDs, which use metal wires, thermistors use a ceramic material that has a negative temperature coefficient, meaning that its resistance decreases as the temperature increases.

Infrared sensors work by detecting the infrared radiation emitted by an object. The amount of radiation emitted by an object is proportional to its temperature, allowing the infrared sensor to measure temperature without physically contacting the object.

Regardless of the type of temperature sensor, the output is typically an electrical signal that can be read by a temperature display or control system. The accuracy and precision of a temperature sensor depend on a variety of factors, including the sensor's design, the materials used, and the calibration process.