Is The Infrared Thermometer Accurate? Why Can't It Be Popularized On A Large Scale So Far?

Your skin often said, "The cold mercury thermometer, I refused. 瞧 people's infrared thermometer, the little finger press, ‘what to measure,’, the blink of an eye measured the temperature.” But if you go to the hospital for examination, the nurse and sister rarely use the infrared thermometer to take care of your forehead. Mercury thermometers and electronic thermometers are often the first choice. The infrared thermometer that is so "high on" can not completely replace the traditional thermometer, so popular? This has to start with its working principle...

As the name implies, the core of the infrared thermometer is infrared light, which is invisible to the naked eye.

A brand of LCT-600 infrared thermometer 

Infrared thermometer (network diagram)

When the temperature of the object is higher than the absolute zero note [1], due to the molecular vibration of the material, the energy generated by it radiates outward in the form of electromagnetic waves, most of which are infrared rays. According to the Stein-Boltzmann law, the total energy radiated from the blackbody [2] in unit time is proportional to the fourth power of its surface temperature.

Among them, A is the emissivity note [3], σ is a constant, based on this principle, the infrared thermometer can indirectly calculate the thermodynamic temperature of the object by collecting the total infrared energy of the measured object.

So, how does the insignificant infrared change into a human-readable Celsius temperature? This process is not complicated. First of all, you only need to put the filter of the thermometer directly on the object to be measured, and the infrared rays generated by the object will actively “send and hold”. After passing through the filter, it will be collected by the photoelectric system and transmitted to the photodetector. The photodetector will It is converted into an electrical signal, sent to the signal processor, corrected by the signal processor, transmitted to the display output system, and finally converted into a temperature value.

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