A reference diode, located behind the flow cell, measures the excitation (EX) light transmitted by the flow cell and corrects flash lamp fluctuations and long-term intensity drift. Because of a non-linear output of the diode (depending on the EX-wavelength), the measured data are normalized.
A diffuser is located in front of the reference diode (see Optical Unit). This diffuser is made of quartz, reduces light and allows integral measurement of the light.
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id: 3586876171