Agilent Technologies Cary 8454 Operator's Manual page 23

Cuvette
Spectrograph lens
Slit
Grating
Figure 1
• Lamps
• Source Lens
• Shutter
Agilent Cary 8454 UV-Visible Spectroscopy System Operator's Manual
Agilent Cary 8454 UV-Visible Spectrophotometer — Overview
Optical system of spectrophotometer
The light source for the UV wavelength range is a deuterium lamp with a
shine-through aperture. As a result of plasma discharge in a low pressure
deuterium gas, the lamp emits light over the 190 nm to approximately
800 nm wavelength range. The light source for the visible and SWNIR
wavelength range is a low-noise tungsten lamp. This lamp emits light over
the 370 nm to 1100 nm wavelength range.
The source lens receives the light from both lamps and collimates it. The
collimated beam passes through the sample (if one is present) in the sample
compartment.
The shutter is electromechanically actuated. It opens and allows light to
pass through the sample for measurements. Between sample measurements
it closes, to limit exposure of sample to light. If the measurement rate is
very fast, you can force the shutter to remain open (using
Agilent ChemStation software) or it stays open automatically (handheld
controller software).
Introduction to Your System
Shutter/stray
Source lens
Photo diode
2
light filter
Tungsten
lamp
Deuterium
lamp
array
23