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BSA Flow Software Installation and User's Guide - CSI

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efraction that it may be neglected. At its rainbow angle, however, this scattering<br />

mode can have sufficient intensity that it will distort the light received from<br />

reflection.<br />

7.2.4 Implementing PDA principles <strong>and</strong> the DualPDA concept<br />

The FiberPDA (57X40 <strong>and</strong> 57X50) <strong>and</strong> the DualPDA (57X80 <strong>and</strong> 57X90) receiving optics<br />

Integrated unit Although the PDA setup has three detectors (FiberPDA) or four detectors<br />

(DualPDA), they are implemented in integrated units: 57X40 or 57X50 for<br />

the FiberPDA <strong>and</strong> 57X80 or 57X90 for the DualPDA. Here, the flexibility of<br />

adjustable angular positions of the detectors (by means of exchangeable<br />

aperture plates) is combined with the convenience in alignment of having<br />

one common front lens. The probe is spray tight <strong>and</strong> is made of aluminium.<br />

A simplified outlines of the FiberPDA <strong>and</strong> DualPDA Probes are shown in<br />

Figure 7-38 to Figure 7-41. The main optical components of the probes are<br />

indicated schematically.<br />

Front Lens Mask<br />

Eye-piece<br />

Segmented<br />

lens<br />

Spatial filter<br />

U3<br />

Multimode<br />

fibres<br />

U2 U1<br />

Figure 7-38: The layout of the FiberPDA Probe (57X40). The three<br />

detectors U1, U2, U3 are in the drwing plane. The eyepiece is looking at<br />

fiber U2.<br />

7-44 <strong>BSA</strong> <strong>Flow</strong> <strong>Software</strong>: Reference guide

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