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10.8
Using the flashlight
To illuminate the working area, the imager is equipped with an LED light.
1. To switch the light on, go to >
Device Settings
>
Flashlight
and
slide the toggle switch to the right.
2. To switch the light off, slide the toggle switch to the left.
10.9 How thermal imaging works
All objects radiate infrared energy. The quantity of energy radiated is based on the
actual surface temperature and the surface emissivity of the object.
The thermal imager senses the infrared energy from the surface of the object and
uses this data to calculate an estimated temperature value.
Many common objects and materials such as painted metal, wood, water, skin, and
cloth are highly effective at radiating energy, and it is easy to get relatively accurate
measurements. For surfaces that are effective at radiating energy (high emissivity),
the emissivity factor is ≥0.90.
This simplification does not work on shiny surfaces or unpainted metals, as these
have an emissivity of <0.6. These materials are not good at radiating energy and are
classified as low emissivity.
To measure materials with a low emissivity more accurately, an emissivity correction
is necessary. Adjusting the emissivity setting will usually allow the thermal imager to
calculate a more accurate estimate of the actual temperature.
