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3
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Device Overview
Page 34
Diode Array/Multiple-Wavelength Detectors (VC-D11, VC-D12, VF-D11)
Operating Manual
3.2
Operating Principle
The device is designed for ultraviolet (UV), visible (VIS) and near-infrared
(NIR) absorption spectroscopy in combination with HPLC or UHPLC
separations. After sufficient separation from other sample compounds,
the analysis of the target compound follows the Beer-Lambert law. This
means that the response of the detector is proportional to the:
•
Concentration of the analyte
•
Path length of the light in the sample
The following image shows the optics of the device, and illustrates how
the device operates:
Figure 1: Operating principle of the optics
No.
Description
1
Tungsten lamp (standard for the VF detector, optional for the VC detectors)
2
VIS lens
3
Deuterium lamp
4
Achromat
5
Flow cell
6
Lens
7
Motorized filter paddle
8
Entrance slit – with the VF detector, the slit width is variable
9
Grating
10
Photodiode array