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2 General Description of Instrument
2.1
V-530 Spectrophotometer Optical System
2.1.1 Optical System
The V-530 is designed to measure the absorption spectrum of a sample at
wavelengths in the range 190 to 1100 nm. The light sources used in the V-530 are a
deuterium(D
) lamp (190 to 350 nm) for the UV region and a halogen (WI) lamp (340 to
2
1100 nm) for the VIS/NIR region. The light from the light source is converged and
enters the monochromator. The light is dispersed by the grating in the monochromator
and converges onto the exit slit. The light that has passed through the exit slit is
monochromated. This light is split into two beams, one going to the sample to be
measured and the other to the reference sample such as a solvent. The light that has
passed through the sample and the reference sample is alternately incident upon the
silicon photodiode.
D
D
2.1.2 Electrical System
The configuration of the electrical system used in the V-530 is shown in Fig 2.2. The
light incident upon the silicon photodiode is converted into an electrical signal and,
after being subjected to synchronous rectification, is converted into a digital signal and
enters the microcomputer. The signal processed by the microcomputer is displayed on
the display unit as digital data or a spectrum.
Actions such as light source changeover, wavelength drive, filter drive, etc. are
controlled by the microcomputer.
M
M
2
Ref
5
M
3
(BS)
Sam
M
4
Figure 2.1 V-530 Optical system
M
1
WI
D
2
WI
D
2
F
S
S
1
F
S
2
G
BS
D
Sam
Ref
G
7
halogen lamp
Deuterium lamp
Slit
Filter
Grating
Bean splitter
Detector
Sample beam
Reference beam
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