Take heart and don’t get discouraged by falsely measured data. With the help of a very simple calibration of an industrial thermometer, you can also reliably measure the body temperature of the human body.
The emissivity of the human body is about 0.98, so if the thermometer allows it, we recommend setting it on the device in this way.
Another important factor that we should not forget is that the human forehead has a real body temperature only rarely. Even if we measure with an accurate thermometer with a deviation of, for example, ± 0.1°C, it seldom shows a temperature of 36-36.5°C, as if we would get by measuring in the armpit. This is because the forehead temperature is quite strongly dependent on the ambient temperature and, especially in colder and windier weather, it can be significantly lower than the actual body temperature.
Field of view - the angle of view of medical thermometers is usually wider than that of industrial thermometers, but in practice, this is not a problem at all. Conventional medical thermometers are designed to measure from a distance of 1 to 5cm and often do not even have optics, so they read with a ratio of 1:1 to 1:3.
Industrial IR thermometers usually feature 1:8 to 1:20 optics and thus measure a smaller face area, at the same measuring distance. A narrower sensing angle of industrial thermometers can, therefore, be an advantage, as it allows measuring from a greater distance, e.g. 20cm.
In conclusion, we can say that with the help of the mentioned simple "calibration" we can get reliable results of measuring body temperature with industrial IR thermometers. Of course, measuring body temperature with a medical thermometer remains the simplest possible way to measure the temperature of the human body. The resolution of both types of thermometers is usually the same: 0.1°C.
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