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Appendix A
relative humidity. Percentage of water
in the air relative to what is physically
possible. Air temperature dependent.
saturation color. The areas that contain
temperatures outside the present level/
span settings are colored with the
saturation colors. The saturation colors
contain an “overow” color and an
“underow” color. There is also a third red
saturation color that marks everything
saturated by the detector indicating that
the range should probably be changed.
span. The interval of the temperature
scale, usually expressed as a signal value.
spectral (radiant) emittance. Amount of
energy emitted from an object per unit of
time, area, and wavelength (W/m
/µm).
temperature range. The current overall
temperature measurement limitation of
an IR camera. Cameras can have several
ranges. They are expressed as two
blackbody temperatures that limit the
current calibration.
temperature scale. The way in which an
IR image currently is displayed. Expressed
as two temperature values limiting
the colors.
thermogram. Infrared image.
transmission (or transmittance) factor.
Gases and materials can be more or less
transparent. Transmission is the amount
of IR radiation passing through them. A
number between 0 and 1.
transparent isotherm. An isotherm
showing a linear spread of color, instead
of covering the highlighted parts of
the image.
visual. Refers to the video mode of an
IR camera as opposed to the normal,
thermographic mode. When a camera is
in video mode it captures ordinary video
images, while thermographic images are
captured when the camera is in IR mode.
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