Ocean Optics ElliCalc - Manual (Page 22)

Ocean Optics Germany GmbH Thin Film Metrology
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If you choose this option, dark current is corrected mathematically. This is only 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 ElliCalc to achieve an automatic adjustment of the integration time within the limits of the
screen (=without saturation)
If you use a double spectrometer there are TWO such wavelengths corresponding to the different lamps
and the different sensitivities of the two spectrometers.
If you use a double spectrometer with different sensitivity regions, e.g. 200-600 nm for channel A ("master
spectrometer") and 500-1100 nm for channel B ("slave spectrometer"), ElliCalc
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 is possible, 550 nm would be a good choice in this case).
7.2.1.7 Crossover wavelength
If you use a double spectrometer with different sensitivity regions, e.g. 200-600 nm for channel A ("master
spectrometer") and 500-1100 nm for channel B ("slave spectrometer"), ElliCalc
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 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.
7.2.2.1 Plot limits
The plot limits are the left and right side of the plot on your screen and coincide with limits of measurement.
The adjustable values of the plot limits depend on the grating in your Ocean Optics spectrometer and are
noted in the calibration sheet of your system.