Ocean Optics NanoCalc - Manual (Page 26)

Ocean Optics Germany GmbH Thin Film Metrology
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7.2.1.4 Internal correct for dark
If you choose this option, dark current is corrected automatically (see Button “measure”).
The Ocean Optics Spectrometer is able to the dynamic dark current internally within a couple of pixels that
are NOT irradiated by external light, and is correcting dynamically.
7.2.1.5 Dark button
If you choose this option, dark current is corrected mathematically. This is necessary if you can’t protect your
system against ambient light or stray light.
7.2.1.6 Maximum intensity
This value describes the maximum intensity in the spectrum of your (halogen ?) lamp.
This value helps NanoCalc to achieve an automatic adjustment of the reference spectrum within the limits of
the screen (=without saturation)
If you use a double spectrometer there are TWO such wavelengths corresponding to the different
sensitivities of the two spectrometers and your light source.
7.2.1.7 Crossover wavelength
If you use a double spectrometer with different sensitivity regions (e.g. 200-600 nm for the CHANNEL A
spectrometer and 500-1100 nm for the CHANNEL B spectrometer), NanoCalc
joins the 2 spectra to get a
single spectrum (200 -1100 nm). The wavelength where the two overlapping spectra are joined is called
crossover wavelength. (any value in your overlap range of the two channels is possible, 550 nm would be a
good choice in this case).
7.2.2 Limits
The spectrometer limits in magenta colors are showing the maximum range of your specific system.