Chapter 3 Instrument Constructions
3-10
AA-6800/6650 Instruction
3.1.7 Optical System
The light from the hollow cathode lamp and the deuterium lamp is combined with a beam combiner, and while
passing through the atomizer, the atoms and concomitant substances absorb light as signal and background
absorption. The light then passes through the spectrophotometer into the photomultiplier tube. The
spectrophotometer is a high resolution Czerny-Turner type. The wavelength is selected by rotating a diffraction
grating to separate the absorption spectrum of the element being analyzed from the other spectra. The direct
drive mechanism used for wavelength selection is automated with the use of a motor. All of the optical elements
are shielded from the outside air with the quartz window plates and are protected from dust and corrosive
gases.
HCL: Hollow cathode lamp
D2: Deuterium lamp
BS: Beam splitter
W1-W4: Windows
M1-M6: Mirrors
S1, S2: Slits
G: Diffraction grating
PMT: Photomultiplier tube
Figure 3.8 Diagram of Optical System
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