The improved device in the visible
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We repeated the measure done before in the visible range with the new experimental setup and made some new. In this case, the optical band pass of filter needed to select the wanted portion of the spectrum is 400 - 720 nm.
Two type of sample have been used:
the first one is a Gretag Macbeth ColorCheker® illuminated by a xenon discharge lamp focused on a grounded glass acting as a diffuser,
the second one is a LCD with LED backlight.
Schematic layout of the experiment
Test target #1:
Gretag Macbeth ColorChecker®
Test target #2:
Pattern displayed on LCD
Result: Reflection and emission spectra
Also in this case, the results obtained before are confirmed and the comparison of the spectra with the same measured by a commercial spectroradiometer (in black) underline a good overlap.
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