The aerospace field has extremely high requirements for temperature measurement, which are determined by its special working environment and mission nature.
In the aviation field, during flight, an aircraft experiences a huge temperature change from high ground temperature to low high - altitude temperature. For example, during take - off on the ground, the environmental temperature may be relatively high, but when the aircraft ascends to the stratosphere, the temperature can be as low as - 50℃ or even lower. When an aircraft engine is working, the internal temperature is extremely high, reaching several thousand degrees Celsius. Therefore, the instruments used for measuring the temperature of aircraft engines need to be able to withstand high temperatures and complex mechanical environments and ensure high - precision measurement. In the structural parts of an aircraft, such as the wings and fuselage, temperature measurement is also very important for evaluating the performance changes of structural materials at different temperatures, which is related to flight safety.
In the aerospace field, spacecraft face more extreme temperature conditions during the launch, orbital operation, and re - entry into the atmosphere. During the launch stage, the high - temperature gas generated by the rocket engine has a huge impact on the surrounding environmental temperature. During orbital operation, the temperature difference between the sun - facing and non - sun - facing sides of the spacecraft is extremely large. The temperature on the sun - facing side can be as high as more than 100℃, while the temperature on the non - sun - facing side can be as low as - 100℃ or lower. During re - entry into the atmosphere, due to air friction, the surface temperature of the spacecraft will rise sharply, reaching several thousand degrees Celsius. These extreme temperature environments require temperature measurement equipment to have ultra - high high - temperature and low - temperature resistance, as well as extremely high measurement accuracy and reliability to ensure the smooth progress of aerospace missions.
