Optical System Overview - Agilent Technologies 1100 Series Reference Manual

Optical System Overview

Optical System
The optical system of the detector is shown in
source is a combination of a deuterium-arc-discharge lamp for the ultraviolet
(UV) wavelength range and a tungsten lamp for the visible (VIS) and
short-wave near-infrared (SWNIR) wavelength range. The image of the
filament of the tungsten lamp is focused on the discharge aperture of the
deuterium lamp by means of a special rear-access lamp design which allows
both light sources to be optically combined and share a common axis to the
source lens. The achromat (source lens) forms a single, focused beam of light
through the flow cell. Each cell room and lamp are separated by a quartz
window which can be cleaned or replaced. In the spectrograph, light is being
dispersed onto the diode array by a holographic grating. This allows
simultaneous access to all wavelength information
Tungsten lamp
Coupling lens
Deuterium lamp
Achromat (source lens)
Holmium oxide filter
Figure 57
Lamps
The light source for the UV-wavelength range is a deuterium lamp with a
shine-through aperture. As a result of plasma discharge in low-pressure
deuterium gas, the lamp emits light over the 190-nm to approximately 800-nm
1100 Series DAD and MWD Reference Manual
Optical System of the Detector
Introduction to the Detector
Figure 57. Its illumination
6
Cell suppor
window
Flow cell
Spectro len
Slit
Diode array
Grating
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