IDEAL 61-847, Руководство пользователя

Страница: 17 / 80

16 17
Emissivity
Emissivity is the term used to describe the efficiency with which a particular
surface emits Infra-Red Radiation IN THE WAVELENGTHS that are detectable
by the sensor in the IR Thermometer. Its sensitivity is in the 8 to 14-micron
wavelength range. To be sure, a hot mass will radiate IR in many different
wavelengths, but the sensing technology employed in this type of instrument
has a narrow bandwidth. Some materials, such as electrical tape, human
skin, certain types of paints are efficient emitters in these Wavelengths.
Others such as aluminum, brass, and gold are inefficient emitters, again, IN
THESE WAVELENGTHS. Heat a bar of gold to 200 degrees and try to read
its temperature and it will appear cold. Cover it in electrical tape, and scan
the tape, and the temperature will be much higher and much more accurate.
Please remember this when making measurements of certain objects. This can
and does greatly affect the accuracy of the readings. This is why you can set
the emissivity value in the meter.
Best Accuracy Coverage
Average Accuracy Coverage
Poor Accuracy Coverage