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3 General Description of Instrument
3.1 V-630 Spectrophotometer Optical System
(1) Optical System
The V-630 is designed to measure the absorption spectrum of a sample over a wavelength range
of 190 to 1100 nm. The light sources used are a deuterium (D
2
) lamp (190 to 350 nm) for the UV
region, and a halogen (WI) lamp (330 to 1100 nm) for the VIS/NIR region. The light from the light
source is focused and enters the monochromator. The light is dispersed by the grating in the
monochromator and focused onto the exit slit. The light that passes 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 incident upon the silicon photodiode.
Ref
M
5
M
2
M
(BS)
3
S
2
D
2
M
1
M
Filter
Figure 3.1 V-630 Optical system
(2) Electrical System
A schematic diagram of the electrical system used in the V-630 is shown in Fig. 3.2. The light
detected by the silicon photodiode is converted into an electrical signal and, after being subjected
to synchronous rectification, is converted into a digital signal and is sent to the computer. The
signal processed by the computer is displayed on the monitor as digital data or a spectrum.
Actions such as light source exchange, wavelength drive, filter drive, etc. are controlled by the
computer.
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