Contact temperature sensor

The thermometer achieves thermal equilibrium through conduction or convection, so that the thermometer's display value can directly indicate the temperature of the measured object. Generally, the measurement accuracy is high. Within a certain temperature range, the thermometer can also measure the temperature distribution inside the object. But for moving objects, small targets or objects with small thermal capacity, large measurement errors will occur. Commonly used thermometers include bimetal thermometers, glass liquid thermometers, pressure thermometers, resistance thermometers, thermistors, and thermocouples. They are widely used in industry, agriculture, commerce and other sectors. These thermometers are often used in daily life. With the wide application of cryogenic technology in the fields of national defense engineering, space technology, metallurgy, electronics, food, medicine and petrochemical industries, and research on superconducting technology, cryogenic thermometers measuring temperatures below 120K have been developed, such as cryogenic gas thermometers, steam Pressure thermometer, acoustic thermometer, paramagnetic salt thermometer, quantum thermometer, low temperature resistance and low temperature thermocouple. Low temperature thermometers require small temperature sensing elements, high accuracy, reproducibility and stability. Carburized glass thermal resistance made by porous high-silica glass carburizing and sintering is a kind of temperature sensing element of low temperature thermometer, which can be used to measure the temperature in the range of 1.6 ~ 300K.