Overview | 1-7
A coiled filament, blackbody radiation steady-state emitter is utilized as
the source for the infrared spectral region. The near-collimated beam from
the emitter assembly (containing a parabolic reflector and CaF
2
lens) trav-
els through the optical bandpass filter (up to six filters located in the filter
wheel assembly) and then through the Measuring Cell. There are several
types of Measuring Cells for the IPS-4 (see Figure 5-2). Typically, Sapphire
windows and gold mirrors are used in the Measuring Cell. Next, a con-
densing lens focuses the beam onto a two-stage thermoelectrically cooled
lead selenide (PbSe) detector.
Wavelength Ranges
1-5 microns
Photometric Range
The photometric absorbance range is dependent on wavelength.
Photometric Noise
The photometric noise is dependent on wavelength.
Typically +/- 0.001 AU
Sample System
The sample system is contained within an attached but separate, insulated
enclosure (Oven/Sample System Enclosure). If this enclosure is heated,
components within this enclosure are specified to operate at temperatures
of up to 150 °C.
The system components are configurable for both gas and liquid applica-
tions. A typical configuration for the sample system contains the connec-
tions for the inlet and outlet sample lines, the Measuring Cell, an aspirator
(gas applications only) to drive the sample fluid through the system, a
Zero Fluid inlet, and a Span Fluid inlet. The system may also contain pres-
sure sensors/indicators, a filter, and other application-dependent compo-
nents. Information about specific (or optional) components that make up
your sample system – if applicable – are included in a separate Manual
Supplement document, located in the “Supplemental Information” section
of this manual or the Documentation Package shipped with the analyzer.
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