Polychromatic light from light source lamp （WI\D2）enters monochromator
through filter and Slit after reflected by M1. Grating in monochromator will
change polychromatic light into homogeneous light, which will focus on M3.
Homogeneous light with corresponding wavelength will enter light split system
through emergence Slit by grating rotation. Half mirror M6 will split it into
measuring beam (transmittance) and reference beam (reflect). Measuring
beam will enter phtoelectricity convertor after relected by M7, through sample
cell and reflected by M10, M11, M12. And it will convert to electricity signal.
Reference beam will enter the same phtoelectricity convertor after reflected by
M8, through reference sample cell and reflected by M9, M13. The electricity
signal converted is basic signal. As half mirror is rotating, reference beam and
measuring beam enter the detector alternatively. The two beam
spectrophotometer with one light source and one detector can get stable test
data.
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