BSA Flow Software Installation and User's Guide - CSI

7.5.2 The DualPDA Detector Unit
The basic version of the 58N81 DualPDA detector unit is configured for the
measurement of two velocity components and includes two interference
filters for 514.5 nm (green) for the U1 and U2 channels and two 488 nm
filters (blue) for the V1 and V2 channels.
U1 U2 U3/V2
U1 U2 U3/V2 V1
U1
58N81 Detector Unit
U1 U2 U3/V2 V1 W
U2 U3/V2 V1 W
V1
W
FIBER
INPUT
PMT SIGNAL
OUTPUT
HIGH VOLTAGE
INPUT
PMT AUX.
POWER
Figure 7-59: Back panel of the 58N81 DualPDA Detector Unit.
Colour separation For a 3D configuration the 58N82 DualPDA Velocity Extension Kit includes
a
for 3D colour separator with a 476.5 nm (violet) interference filter for the W
channel.
7.5.3 Changing interference filters
A small tool is supplied which has to be plugged onto the fiber connector at
the backside of the detection unit. This tool allows unscrewing the back part
of the filter connector and taking it off from the detection unit. The mounted
interference filter can then be unscrewed manually from this back part of the
fiber connector and be exchanged by another one.
7.5.4 Configuring the DualPDA system in FiberPDA system
Although the four-detector configuration on the DualPDA has advantages in
certain applications, it should be pointed out that it is not in general superior
for all the applications. There are applications where the sensitivity of the
planar PDA has more disadvantages and where a standart three-detector
configuration would be more robust.
A DualPDA system can therefore be easily converted to a FiberPDA
configuration. The conversion of a DualPDA to a FiberPDA comprises four
steps:
Exchanging the aperture plate.
Remove the DualPDA aperture plate (chapter 0) from the DualPDA probe
and mount the according FiberPDA aperture plate (Figure 7-43 ) into the
DualPDA probe instead.
Exchanging the third interference filter in the DualPDA detection box.
7-78 BSA Flow Software: Reference guide
CAL. INPUT
SHUTTER