Precautions For Using Infrared Thermometer
Infrared temperature measurement technology plays an important role in product quality control and monitoring, equipment online fault diagnosis and safety protection, and energy saving during the production process. In the past 20 years, non-contact infrared human body thermometers have developed rapidly in technology, with continuous improvement in performance, continuous enhancement of functions, continuous increase in varieties, and continuous expansion of the scope of application. Compared with contact temperature measurement methods, infrared temperature measurement has the advantages of fast response time, non-contact, safe use and long service life. Non-contact infrared thermometers include three series: portable, online and scanning, and are equipped with various options and computer software. Each series has various models and specifications. Among various types of thermometers with different specifications, it is very important for users to choose the correct infrared thermometer model.
1.The working principle of infrared thermometer
The optical system collects the infrared radiation energy of the target in its field of view, and the size of the field of view is determined by the optical parts and position of the thermometer. The infrared energy is focused on the photodetector and converted into a corresponding electrical signal. The signal is converted into the temperature value of the measured target after being corrected by the amplifier and signal processing circuit in accordance with the internal algorithm and target emissivity of the instrument. In addition, the target and the environmental conditions where the thermometer is located, such as the influence of temperature, atmosphere, pollution and interference on performance indicators and correction methods should also be considered.
All objects whose temperature is higher than absolute zero are constantly emitting infrared radiation energy into the surrounding space. The size of the infrared radiation energy of an object and its distribution according to wavelength-have a very close relationship with its surface temperature. Therefore, by measuring the infrared energy radiated by the object itself, its surface temperature can be accurately determined, which is the objective basis on which infrared radiation temperature measurement is based.
2.The problems that should be paid attention to when using best infrared thermometer
It only measures the surface temperature, the infrared thermometer cannot measure the internal temperature.
The temperature can not be measured through quartz glass if the wavelength is above 5um. The glass has very special reflection and transmission characteristics, so accurate infrared temperature reading is not allowed. But the temperature can be measured through the infrared window. Infrared thermometers are best not used for temperature measurement of bright or polished metal surfaces (stainless steel, aluminum, etc.).
To locate the hot spot, to find the hot spot, the instrument aims at the target, and then scans up and down on the target until the hot spot is determined.
Pay attention to environmental conditions: steam, dust, smoke, etc. It blocks the optical system of the instrument and affects accurate temperature measurement.
Ambient temperature. If the thermometer is suddenly exposed to an ambient temperature difference of 20°C or higher, allow the instrument to adjust to the new ambient temperature within 20 minutes.
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