The most widely measured physical parameter is temperature. Whether in process industry applications or in laboratory settings, accurate temperature measurements are a critical part of success. Accurate temperature measurements are needed in medical applications, materials research in labs, electrical/electronic component studies, biology research, geological studies, and electrical product device thermal characterization. There are many different types of sensors available to measure temperature. The three most common are resistance temperature detectors (RTDs), thermocouples (TCs), and thermistors. Each of them have specific operating parameters that may make it a better choice for some applications than others. Solid state sensors are also available for moderate temperature range applications and have the advantage of built-in signal conditioning and ease of interfacing – in some cases with direct digital serial interfaces. Due to the scope of this article, such sensors will not be covered in detail.
KEITHLEY (2007) How to Select the Right Temperature Sensor