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1100 Series DAD and MWD Reference Manual 229

Introduction to the Detector 6

Optical System Overview

Optical System

The optical system of the detector is shown in Figure 57. Its illumination

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

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

Figure 57 Optical System of the Detector

Tungsten lamp

Deuterium lamp

Holmium oxide filter

Achromat (source lens)

Flow cell

Slit

Diode arra

Grating

Cell suppo

window

Spectro le

Coupling lens

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Agilent Technologies 1100 Series Manual de servicio Pagina 229