International Radiation Detectors, Inc.
PA13: Multi-channel System
for Pulse Energy Measurement
The PA13 detection system is an instrument that measures
the illumination intensity in a pulsed environment. This
system produces an output voltage that is proportional to
the intensity of pulsed radiation incident on the IRD photodiodes.
This is achieved by charge amplification and integration.
The PA13 incorporates a self-test feature that allows users
to exercise the functionality of the detection system
without requiring illumination of the detector.
The PA13 Multi-channel Pulse Detection System contains up
to 10 identical channels which include the following
instrumentation: (1) a preamplifier board which amplifies
the charge produced from pulse radiation incident on the
photodiode, (2) a driver board which provides the power to
drive the signal over long cables and (3) a sampler board
that samples the pulse produced by the preamplifier and
provides an output voltage proportional to the input charge.
The sampler board also provides power to the entire detector
chain. Following table describes specifications of the PA13
system :
|
Parameter
|
Conditions
|
Min.
|
Typ.
|
Max.
|
Units
|
|
Detector Bias Voltage
|
-
|
0
|
0
|
12
|
V
|
|
Minimum Charge Dectection Limit
|
High Gain
|
-
|
1
|
2
|
pC
|
|
Maximum Charge Detection Limit
|
High Gain
|
-
|
100
|
110
|
pC
|
|
Maximum Charge Detection Limit
|
Low Gain
|
-
|
1000
|
1100
|
pC
|
|
Maximum Pulse Width
|
Low Gain/High Gain
|
30
|
50/150
|
75/200
|
µs
|
|
Acceptable Source Sample Rate
|
All Gain Ranges
|
10
|
1K
|
2K
|
Hz
|
|
Noise Figure
|
All Bands (Unsampled)
|
> 8
|
16
|
64
|
nV/Hz1/2
|
|
Test Capacitors
|
Integral to each channel
|
9
|
10
|
11
|
pF
|
|
Max Sampled Output
|
High Gain, 100 pC test charge
|
-
|
10
|
10.5
|
V
|
|
Max Sampled Ouput
|
Low Gain, 100 pC test charge
|
-
|
1.2
|
1.4
|
V
|
|
Power Supply Input Voltage
|
50 - 60 Hz
|
120
|
220
|
-
|
V
|
|
Total System Operating Current
|
Per Channel (sampler, bugger, and pre-amp)
|
-
|
120
|
-
|
mA
|
|
Preamp Power Supply Current
|
V = +/- 12 V
|
-
|
3.75
|
-
|
mA
|
|
Buffer Power Supply Current
|
V = +/- 12 V
|
-
|
3.0
|
-
|
mA
|
|
Preamp Power Dissipation
|
-
|
-
|
45
|
-
|
mW
|
|
Buffer Power Dissipation
|
-
|
-
|
36
|
-
|
mW
|
|
Sustem Operating Current
|
All 10 Channels
|
-
|
1.2
|
-
|
A
|
|