6-2 Model 3022A Condensation Particle Counter
extend the pulse width and thus, the time the counter is disabled.
In this situation the counter can be described as “paralyzable,”
because at sufficiently high particle rates the pulse width extends
indefinitely, thus paralyzing the counter.
Single Pulse Trace
Average of 32 Pulse Traces
Time: 5 µs per Division
1.5 Volt
5 µsec
Figure 6-1
Typical Digital Pulse Trace From the Photodetector
The statistics for a paralyzable counter give the relationship of the
measured particle concentration to the true concentration as:
C
a
= C
i
exp(QtC
a
)
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