9 – Infrared Primer
A6600/A6650 User’s Manual
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output to 5 volts! Note, though, that the application of the calibration curve is a theoretical procedure
where no electronic or other limitations exist. We trust that if there had been no signal limitations in
the camera, and if it had been calibrated far beyond 5 volts, the resulting curve would have been very
much the same as our real curve extrapolated beyond 4.1 volts, provided the calibration algorithm is
based on radiation physics, like the FLIR Systems algorithm. Of course there must be a limit to such
extrapolations.
Figure 8-15: Relative magnitudes of radiation sources under varying measurement conditions
(SW camera).1: Object temperature; 2: Emittance; RED: Object radiation; BLUE: Reflected
radiation; GREEN: atmosphere radiation. Fixed parameters:
τ = 0.88; Trefl = 20 °C (+68 °F);
Tatm = 20 °C (+68 °F).
9.4 Emissivity tables
This section presents a compilation of emissivity data from the infrared literature and FLIR Systems
own measurements.
Table 8-1: T: Total spectrum; SW: 2–5 µm; LW: 8–14 µm, LLW: 6.5–20 µm; 1: Material; 2:
Specification; 3: Temperature in °C; 4: Spectrum; 5: Emissivity: 6: Reference
1.
Mikael A. Bramson: Infrared Radiation, A Handbook for Applications, Plenum press, N.Y.
2.
William L. Wolfe, George J. Zissis: The Infrared Handbook, Office of Naval Research,
Department of Navy, Washington, D.C.
3.
Madding, R. P.: Thermographic Instruments and systems. Madison, Wisconsin: University of
Wisconsin–Extension, Department of Engineering and Applied Science.
4.
William L. Wolfe: Handbook of Military Infrared Technology, Office of Naval Research,
Department of Navy, Washington, D.C.
5.
Jones, Smith, Probert: External thermography of buildings..., Proc. of the Society of Photo-
Optical Instrumentation Engineers, vol.110, Industrial and Civil Applications of Infrared
Technology, June 1977, London.