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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)
2
lamp (340 to 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.
Ref
D
D
Sam
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.
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M
1
D
2
M
M
2
5
S
2
M
3
(BS)
M
4
Fig 2.1 V-530 Optical system
7
WI
halogen lamp
WI
Deuterium lamp
D
2
F
Slit
S
S
1
Filter
F
Grating
G
Bean splitter
BS
Detector
D
Sample beam
Sam
Reference beam
Ref
G
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