NTC thermistor.Wide-Angle Fresnel Lens

　　1. NTC refers to the thermistor phenomenon and material whose resistance decreases exponentially with temperature rise and has a negative temperature coefficient. The material is a semiconductor ceramic made of two or more metal oxides, such as manganese, copper, silicon, cobalt, iron, nickel, zinc, etc., which are fully mixed, formed, and sintered. It can be made into a negative temperature coefficient. (NTC) thermistor. Its resistivity and material constant vary with the proportion of material composition, sintering atmosphere, sintering temperature and structural state. Now there are also non-oxide NTC thermistor materials represented by silicon carbide, tin selenide, tantalum nitride, etc.

　　Thermistor

　　2. The development of NTC thermistors has gone through a long period of time. In 1834, scientists discovered that silver sulfide has a negative temperature coefficient. In 1930, scientists discovered that cuprous oxide-copper oxide also has the performance of negative temperature coefficient, and successfully used it in the temperature compensation circuit of aviation instruments. Subsequently, due to the continuous development of transistor technology, the research of thermistor has made significant progress. In 1960, NTC thermistor was developed, which is widely used in temperature measurement, temperature control, temperature compensation and so on.

　　3. Its measurement range is generally -10 ~ +300 °C, and it can also be -200 ~ +10 °C.

　　4. The accuracy of the thermistor thermometer can reach 0.1 °C, and the temperature sensing time can be as short as 10s or less. It is not only suitable for granary thermometers, but also for temperature measurement in food storage, hygiene, scientific farming, oceans, deep wells, high altitudes, glaciers, etc.

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