Download ENS- ECH photodetector module P30232

photodetector module
P30232
SENS-TECH
SENSOR TECHNOLOGIES
1 description
The P30232 is a plug-and-play photodetector module,
configured for photon counting. It comprises a selected 30 mm
diameter end window photomultiplier tube with blue-green
sensitive bialkali photocathode and ultra-low dark counts, a
positive high voltage power supply, a high speed amplifierdiscriminator, a counter and a micro controller. All are
encapsulated within a cylindrical mumetal* case, providing a
high level of immunity from the effects of external magnetic
fields. Low voltage and signal output connections to the module
are by axial flying leads.
2 application
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intended for ultra-low light measurements requiring single
photon detection via an RS232 interface to a host PC.
3 features
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simplicity of operation
minimal set up time
compact cylindrical assembly
electrostatic and magnetic shielding
RS232 interface
quartz window option
20 MHz count rate capability
automatic dead time correction
operates from +5 V supply
preset discriminator level and HV
fully enclosed high voltages
only 600 mW total power dissipation (typical)
discriminator threshold preset to -2 mV
HV factory set for optimum operating voltage
will operate with any PC running Windows® 95/98, with a
free RS232 serial port
4 user manual
A manual giving detailed installation, start-up software and
programming procedures is supplied with every package.
5 test data
Each module is supplied with test data including photocathode
parameters and dark counts.
6
characteristics
photocathode type
photocathode active diameter
spectral response range
peak QE at 400 nm
output
baud rate
parity
data bits
stop bits
control
discriminator level
dark counts at 20 °C (typ.)
(max.)
6 -1
power input at 10 s
warm up time
ratings
input voltage
temperature (operating)
(storage)
humidity (non-condensing)
weight
operating position
finish
7
bialkali
25 mm
280 to 630 nm, see curve
28 %
RS232
9600
None
8
1
see user manual
-2 mV
-1
100 s
-1
200 s
+5 V, 120 mA
less than 2 s
+4.75 V to +5.25 V
+5 °C to +55 °C
-40 °C to +55 °C
93 % RH maximum
at 30 ºC
310 g
any
matt black
user I/O connections
TTL input and output lines are available for control of the
module and to command peripheral operations.
trigger input (grey)
start command for cycle
defined by software
user output (violet)
start command for user
applications. For example:
activate shutter; busy indicator
P30232 data sheet
page 2
11 outline drawing mm
photocathode spectral response
8
ø35.0 ±0.5
quantum efficiency %
30 quartz
25.0 active diameter
20
photomultiplier
10
9
181.5 ±1
mumetal* case
0
100
300
500
700
wavelength nm
900
dynamic range
Typical counting sensitivity for P30232 at 400 nm. Note that
automatic dead time correction has been applied at high count
rates. The dynamic range can be further extended at low count
rates by dark count subtraction in the software.
10
output counts s-1
10
10
8
610 ±50
108
7
1850 ±50
6
10
10
10
5
9 way ‘D’ socket
2
Tx
3
Rx
5 Gnd
4
3
10
+5V Red
0V Black
I/O out Violet
I/O in Grey
2
10
dark count subtraction
1
10
-17
10
-16
10
-15
10
-14
10
-13
10
12
-12
10
-11
10
-10
10
-9
incident light power W at 400 nm and 20 °C
10
screened
cable
Each module is supplied with test data. Wherever possible
installation should be carried out in subdued light.
Remove the protective cap from the module. Mount the module
and make power input and signal connections.
functional diagram
photomultiplier
photocathode
installation and operation
Do not expose the photomultiplier tube photocathode to strong
lights while the module is energised.
anode
dynodes
13
+ve HV supply
disable
HV
+5V (red)
amplifier
/
discriminator
0V (black)
trigger in (grey)
Tx (pin 2)
Rx (pin 3)
0V (pin 5)
RS232
interface
Sens-Tech Limited
Bury Street, Ruislip
Middx HA4 7TA, UK
tel: +44 (0) 1895 630771
fax: +44 (0) 1895 635953
e-mail: [email protected]
microcontroller
user out (violet)
warning
No attempt must be made to repair or dismantle this product.
High voltage used within the module may present an electric
shock hazard.
Operation beyond the maximum ratings, or reversal of the input
voltage may result in loss of performance or permanent
damage to the product.
counter
*mumetal is a registered trademark of Magnetic Shield Corporation
The company reserves the right to modify these designs and
specifications without notice. Developmental devices are intended for
evaluation and no obligation is assumed for future manufacture.
While every effort is made to ensure accuracy of published information
the company cannot be held responsible for errors or consequences
arising therefrom.
an ISO 9001 registered company
www.sens-tech.com
SENS-TECH
SENSOR TECHNOLOGIES
© Sens-Tech Limited, 2007
DS_ P30232 Issue 1
30 march 2007