Chapter 2: Theory of Operation 53
Filters
Optical filters modify the spectral distribution of light scatter and fluorescence
directed to the detectors. Three kinds of filters are used in the detector arrays:
longpass (LP) filters are used to steer light between the detectors within a detector
array, while bandpass (BP) and neutral density (ND) filters allow fine-tuning of
the spectral wavelengths that need to be collected (Figure 2-7).
Figure 2-7 Detectors and filters in octagon array
longpass
bandpass
PMT
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