Operation
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file, the software calculated the spectral sensitivity of your spectrometer and shows it as a
dark green line. To save this new calibration to the device, click ‘‘OK’’.
If you also want to calibrate the absolute scale of the intensity axis, you need to take a
spectrum and also need to know the absolute optical power (in Watts) of this spectrum. If
you measure the actual optical power with an optical powermeter, please make sure that
the powermeter only detects wavelengths that are within the wavelength range of your
spectrometer (for example by choosing a suitable light source). Then choose ‘‘Calibrate
power’’ from the Tools menu and enter the actual power. If you click ‘‘OK’’, the new power
calibration is stored in the device and used for scaling the intensity axis. This axis then
displays the spectral power density in nW/nm.
In addition, you don’t have to calibrate the power at the spectrometer entrance. For
instance, you could calibrate the power that enters your measurement probe or any
other power in your setup, as long as it is proportional to the power that enters the
spectrometer. Just remember that the optical powers and power densities displayed by
the software refer to this value.
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