Optics Assembly Light Path - Waters 2489 Operator's Manual

Waters 2489 UV/Visible Detector optics assembly
D lamp
2
Window
Ellipsoidal
mirror
Optional
Sample
photodiode

Optics assembly light path

The detector provides an extremely efficient design for exceptionally high
light throughput. It operates as follows:
1. The ellipsoidal mirror collects light from the lamp and focuses it through
the filter wheel onto the entrance slit. The spherical mirror directs light
toward the grating. A different portion of the spherical mirror focuses
dispersed light of a particular wavelength band, determined by the
grating angle, onto the entrance of the flow cell. Light exiting the flow
cell passes through the cuvette location to the sample photodiode.
2. The beamsplitter, located just ahead of the flow cell, diverts a portion of
the light to a reference photodiode.
3. When you enter a new wavelength through the detector's front panel (or
through Empower™ or MassLynx™ software), the detector rotates the
grating to the appropriate position.
Filter
wheel
cuvette
TaperSlit
Flow Cell
Beamsplitter
Slit
Grating
Reference
photodiode
Principles of operation
Spherical
mirror
1-5