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TM 10-6640-233-10
Figure 1-8. Fluid Analysis Spectrometer
The sample to be analyzed is electrically excited in the analytical gap. Light from the resulting arc passes through the
entrance lens where the light is formed into a beam. The beam passes through a deflection plate which swivels back and
forth during the integration process. This motion deflects the beam away from its direct (or forward) path providing
background light subtraction. The beam then strikes the grating, which acts as a prism to disperse the light into spectral
lines. Each spectral line of interest passes through its exit slit (located on the focal curve) to the photomultiplier (PM)
tube of the channel assigned to the spectral line. The PM tube converts the light into electrical current that builds up a
charge on the integrating capacitor of the subject channel. The analog voltage on the capacitor is processed by the data
conversion circuitry and fed to the readout electronics circuits.
b. The AOAP Standard Data System (SDS) (Figure 1-9). The information generated from the spectrometer can be
displayed on the numerical LED indicators or printed out by the autoprinter interface which is used by the AOAP
Standard Data System (SDS). The AOAP SDS is comprised of the following modular components:
Wang Model MICROVP-2 Central Processing Unit (CPU)
Three Wang Model 2336DW Integrated Terminal Sets
Wang Model 2280-3A Disk Drive
Wang Model 2270A-2 Diskette Drive and Processing Unit (DPM)
· Data Products No.2273-2 LPM Line Printer
· Wang Model 22C03 Diskette Controller
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