LumaSense Technologies M310 - Manual (Page 31)

M310 Manual Appendix B: Calibration Methods 31
Example 2: The standard (350 C) blackbody was factory calibrated to provide effective
emissivity = 1.0 at 8-14 µm. You wish to use this source for an imager that has spectral response
of 3-5 µm. The mean value between 3-5 µm from the graph above = 0.953. The blackbody exit
radiance at 3-5 µm will be approximately equivalent to a blackbody that has emissivity = 0.953.
This will cause your imager to receive 4.7% less infrared energy causing it to read a lower
temperature. The table below shows the expected radiance temperatures and errors. At 250 C,
your imager will read 246.4 or 3.6° low so you should set the blackbody setpoint to 253.6 =
(250+3.6) to force the exit radiance to be equal to 250 C at 3-5 µm.