Overview | 1-5
A Xenon flash lamp is utilized as the source for the ultraviolet and visible
regions. The collimated beam from the Xenon lamp travels through the
Measuring Cell. There are several types of Measuring Cells for the IPS-4
(see Figure 5-2). When an application requires sensitivity at shorter wave-
lengths, UV-grade fused silica windows are used. For streams containing
components that are incompatible with fused silica (e.g. hydrofluoric acid,
HF) or that require higher maintain pressures, Sapphire windows are also
available. Front-surface aluminum mirrors are used in the Measuring Cell.
After the beam passes through the Measuring Cell, a diffraction grating
disperses the light over a range of wavelengths. Next, a concave mirror
focuses the beam onto a 512 or 1024 element photodiode detector array.
Wavelength Ranges
Wavelength Range Detector Grating
220-375 nm 512 pixels 1200/mm
300-500 nm 512 pixels 1200/mm
220-550 nm 1024 pixels 1200/mm
300-800 nm 1024 pixels 900/mm
Wavelength Accuracy
+/- 0.5 nm
Wavelength Resolution
3 nm
Analyzer Range
ppm to 100 %, depending on the application.
Photometric Range
The photometric absorbance range is dependent on wavelength.
Photometric Noise
The photometric noise is dependent on wavelength.
Typically +/- 0.001 AU
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