Lambda 20, Lambda 40 UV/Vis Spectrometers
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For operation in the visible (Vis) range, mirror M1 reflects the radiation from the
halogen lamp onto source mirror M2. At the same time M1 blocks the radiation
from the deuterium lamp.
For operation in the ultraviolet (UV) range, mirror M1 is raised to permit radiation
from the deuterium lamp to strike source mirror M2.
Source change is automatic during monochromator slewing.
Radiation from the source lamp is reflected from source mirror M2 through an
optical filter on the filter wheel assembly.
A stepping motor drives the filter wheel to be in sychronization with the
monochromator.
Depending on the wavelength being produced, the appropriate optical filter is
located in the beam path to prefilter the radiation before it enters the
monochromator.
Filter change is automatic during monochromator slewing.
From the optical filter the radiation passes through the entrance slit (Slit 1) of the
monochromator.
The radiation is dispersed at the grating to produce a spectrum. The rotational
position of the grating effectively selects a segment of the spectrum, reflecting this
segment through the exit slit (Slit 2) to mirror M3.
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