LumaSense Technologies M310 - Manual (Page 28)

M310 Manual Appendix B: Calibration Methods 28
Emissivity (for M310, M315, M320, M316 series blackbodies)
When measurements are required at wavelengths other than the one used for factory
radiometric calibration, or if the calibration was done thermometrically (see above), the graph
below provides emissivity vs. wavelength for this model. Integrating over the wavelength
region of interest will provide the average emissivity for your measurement. If the blackbody
was calibrated radiometrically, the apparent emissivity at 8-14µm was normalized to 1.0. The
target emissivity vs. wavelength can be read directly from the graph. Again, you would have to
normalize the mean emissivity between 8 and 14µm to 1.0, then correct for other wavelength
regions. The next two pages have examples that do this normalization for you.
Infrablack 3 Coating 350C version
0.9
0.91
0.92
0.93
0.94
0.95
0.96
0.97
0.98
0.99
1
0 5 10 15 20 25 30
Wavelength (um)
em
is
s
iv
it
y
emissivity
3-5um
8-14um
e=0.968
8-12um
e=0.966
mean emissivity=0.923