Agilent InfinityLab LC Series VWD User Manual 16
1 Introduction to the Variable Wavelength Detector
Optical System Overview
Filter Assembly
The filter assembly is electromechanically actuated. During wavelength
calibrations it moves into the light path.
Figure 5 Filter Assemby
The filter assembly has two filters installed and is processor-controlled.
A photo sensor determines the correct position.
OPEN
nothing in light path at
λ
<370nm
CUTOFF
cut off filter in light path at
λ
> 370 nm
HOLMIUM holmium oxide filter for wavelength check
SHUTTER for measurement of dark current of photo diodes
Cutoff Filter
Shutter
Cutoff Filter plus Holmium Oxide Filter
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