The parts that can be touched during product operation may cause personal injury if the temperature is too high; Moreover, excessively high temperatures inside the equipment can also affect product performance, even leading to a decrease in insulation level or an increase in mechanical instability of the product. Therefore, in the product design process, temperature rise testing is an important step that needs to be considered to ensure the safe and stable operation of the product!

The methods of measuring temperature rise can be divided into two categories: non-contact and contact based, depending on the type of temperature measuring instrument used.
Non-contact measurement method

To measure the external temperature of the object being measured, it is necessary to correct the emissivity of the surface of the object being measured in order to obtain the true temperature. Moreover, the measurement method is affected by the distance between the object being measured and the instrument, as well as other media such as water vapor, smoke, and dust on the radiation channel, resulting in lower measurement accuracy. The methods we often use in daily life include spectral temperature measurement technology, holographic interference temperature measurement technology, and CCD based tricolor temperature measurement technology.

Contact measurement method

Contact thermometers generally have two types of temperature probes: thermocouples and thermistors

The working principle of a thermocouple is based on the Seeback effect, where two conductors with different compositions are connected at both ends to form a circuit. If the temperature of the two connection ends is different, a physical phenomenon of thermal current is generated in the circuit, which is used to measure temperature.

The measurement principle of thermal resistance is to measure temperature based on the characteristic that its resistance also changes when the temperature changes.

In the contact type testing method, the temperature measuring element is directly in contact with the measured medium to directly measure the temperature of the measured object, making it simple, reliable, and highly accurate.