December 5, 2017, 715004753 Rev. B
Page 15
1
2998 PDA Detector Optics
Principles
To use the 2998 Photodiode Array (PDA) detector effectively, you must understand the principles
that underlie operation of the detector’s optics and electronics.
1.1
Detector optics
The detector is an ultraviolet/visible light (UV/Vis) spectrophotometer. With a photodiode array of
512 photodiodes and an optical resolution of 1.2 nm/pixel, the detector operates within a range of
190 to 800 nm.
The figure below illustrates the light path through the optics assembly of the detector.
Figure 1–1:
Optics assembly light path
The following table describes the optics assembly components.
TP02819
Grating
Photodiode
array
Spectrograph
mirror and mask
Flow cell
Window
Filter
flag/shutter
Lamp
Order
filter
M1 mirror
Slit
Summary of Contents for 2998
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