Thermo Scientific VC-D60 Operating Manual page 32

3 • Device Overview
Optical system
Figure 2: Optical system of the refractive index detector
Page 32
No. Description
1 Tungsten lamp
2 Condense lens
3 First slit
4 Collimator lens
5 Second slit
6 Flow cell
7 Mirror
8 Null glass
9 Photo sensor
Light from a low-power, long-lifetime tungsten lamp is collimated by a
lens and slit and passed through reference and sample cells, reflected
off a mirror, passed back through the optical cells, and focused by lenses
onto a pair of photodiodes (photo sensor).
During operation, the detector's reference and sample cells are filled
with mobile phase. The reference cell is then isolated from the flow path
and mobile phase flows through the sample cell only. As long as no
difference exists between the refractive indices of the media of the two
cells, there is no refraction of the light passing through them.
Refractive Index Detector (VC-D60)
Operating Manual