3-6 Chapter 3: Module components SHB_U14
Apertures
Location in module
The apertures and their adjustment screws are located on the main frame between
the modulator and sample cells.
Structure
The main frame always has two apertures installed and these are moved back and
forth horizontally by a screw-type drive mechanism.
They are shown in a inset to the cross section of the sample cells installed in the
sample and reference chambers.
Function
The apertures act as a shutter for the infrared emitter signal according to the
setting provided for the sample or reference beam.
Goal Equal intensity for both infrared detector beams during the basic adjustment.
Asymmetry is caused by design factors or sample gas characteristics.
Alignment is accomplished with the "optical alignment" function.
Figure 3-7
Apertures
1 Beam path 1 aperture adjustment screw
2 Aperture in beam path 1
3 Aperture in beam path 2
4 and 5 Beam path 2 aperture adjustment screw
6 Opening for sample cell in beam path 2
7 Opening for sample cell in beam path 1
8 O rings to seal sample cell(s)
9 Openings for lines to gas module
10 Main frame
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