The detector
Emission-detector electronics employ photon-counting for the
ultimate in low-light-level detection. Photon-counting concentrates on
signals that originate from fluorescence photons, ignoring the smaller
pulses originating in photomultiplier-tube electronics. Lower-performance
fluorometers with analog detection—in contrast—simply add noise
and signal together, hiding low signals within the noise. The emissiondetector
housing also contains an integral high-voltage supply which is
factory-set to provide the maximum count-rate, while eliminating most
of the dark noise.