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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.

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Lumasense-technologies M310 Manuale Utente Pagina 31