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TM
TM
Page <12>
V1.0
26/04/18
6.6 -
Shutter
The thermal Image of the Thermal Imager becomes blurry, when the Thermal Imager no correcting after some minutes or the
Thermal Imager changes target. To get fine thermal Image, the Thermal Imager need to correct.
The Thermal Imager has two mode for correcting, Manual and Auto Mode. In Manual Mode, push the ″ ″ Shutter button, the
Thermal Imager will correct. In Auto Mode, the Thermal Imager can open Auto Shutter feature in Settings Menu.
6.7 -
Temperature Measurement
All objects radiate infrared energy. The quantity of energy radiated is base 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 very good at radiating energy and it is easy to get relatively accurate measurements. For surfaces that are good
at radiating energy (high emissivity), the emissivity factor is >=0.90. This simplification does not work on shiny surfaces or
unpainted metals as they have an emissivity of <0.6. These materials are not good at radiating energy and are classified as low
emissivity. To more accurately measure materials with a low emissivity, an emissivity correction is necessary. Adjustment to the
emissivity setting will usually allow the Thermal Imager to calculate a more accurate estimate of the actual temperature. More
information please see Emissivity Adjustment to get the most accurate temperature measurements.
6.8 -
Emissivity Adjustment
The correct emissivity value is important to make the most accurate temperature measurement. Emissivity of a surface can
have a large effect on the apparent temperatures that the Thermal Imager observes. Understanding the emissivity of the
surface, but may not always, allow you to obtain more accurate temperature measurements.
Note:
Surfaces with an emissivity of <0.60 make reliable and consistent determination of actual temperature problematic. The lower
the emissivity, the more potential error is associated with the Imager’s temperature measurement calculations. This is also true
even when adjustments to the emissivity and reflected background adjustments are performed properly.
Emissivity is set directly as a value or from a list of emissivity values for some common materials. The global emissivity displays
in LCD Screen as E=x.xx.
The following table gives typical emissivity of important materials.
Material
Emissivity
Asphalt
0.95
Concrete
0.95
Hard plaster
0.90
Wood {natural)
0.93
Lime Stone
0.98
Ballast chipping
0.95
Paper (every colour)
0.95
Plastics non transparent
0.95
Tissue (fabric)
0.95
Sand
0.90
Glass wool
0.90
Melted asphalt
0.93
Screed/attic/pavement
0.93
Foamed polystyrene
0.94
Material
Emissivity
Drywall
0.95
Render
0.94
Smoothing cement
0.90
Lacquer
0.92
Latex paint
0.97
Wallpaper
0.93
Tilling
0.93
Parquet floor
0.90
Laminate
0.90
PVC-Floor
0.92
Brick
0.93
Cliff
0.97
Roofing cardboard
0.93
Stucco
0.91
