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PHOTOMULTIPLIER DETECTOR SYSTEM
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This turnkey detector is a low noise, high sensitivity system that
exceeds the performance of silicon photodiode systems over the
wavelength range of 185 to 800 nm. It has a superior combination
of a large, 8 mm diameter, aperture and fast response of ten
microseconds. The convenient controller provides eleven gain
settings over an amplification range of 102 to 106 and includes a
detector overvoltage protection circuit in case the impinging light
beam is too bright.
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The housing includes a manual shutter and a filter tray for any one
inch diameter optic of thickness less than 0.4 inches. The entrance
aperture is threaded to accommodate C-mount optics and
accessories including a fiber adapter, a field limiting tube and a
manual iris. The tube is threaded internally and includes two
retaining rings for mounting one inch diameter optics. The housing
has 1/4 - 20, 8 - 32, and M6 threaded mounting holes along two
sides for post mounting and bulkhead mounting tabs with clear
holes for 8 - 32 screws near the entrance aperture.
The controller includes a protection circuit that turns off the high
voltage when too much light reaches the photocathode. The
detector housing contains an amplifier near the anode output of
the photomultiplier tube to minimize noise. All high voltage for the
tube is produced inside the housing with only low control voltage
of fifteen volts present on the cable from the controller to the
housing. The zero to eight volt detector output is accessed by a
BNC connector on the housing. A half meter coaxial cable is
included to connect this output to a digital voltmeter or A/D
converter.
Key Benefits
- UV sensitive to 185 nm
- Low noise, high sensitivity
- Eleven selectable gain settings between 102 and 106
- Protection Circuit with auto - shutdown in case of overvoltage due to saturation
- BNC output connector on tube
- No external power supply needed
- Filter slot and manual shutter in tube housing
- Standard 8 - 32, 1/4 - 20 and M6 mounting holes
- Large 8 mm photocathode
Meadowlark Optics� photomultiplier detector has a significant
reduction in the amount of noise seen by the photomultiplier
tube.
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Detector sensitivity as a function of wavelength for a gain of
105.
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| SPECIFICATIONS |
| Wavelength Range |
185 - 800 nm |
| Clear Aperture Size |
8 mm |
| Saturation Light Level at 102 gain |
1.5 µW at 400 nm |
| Cathode |
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Typical Luminous Sensitivity
Radiant Sensitivity |
150 µA / lm
60mA / W at 400 nm |
| Anode |
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Typical Luminous Sensitivity
Radiant Sensitivity |
7.5x107 V / lm
30 V / nW at 400 nm |
| Operating Temperature Range |
5°C - 50°C |
| Storage Temperature Range |
-20°C - +50°C |
| Power Requirements |
90 - 264 V ac
47 - 63 Hz |
| Maximum Output Voltage |
8 V |
| Frequency bandwidth |
DC to 20 Khz |
| Typical Offset Voltage |
3 mV |
| Ripple Noise (peak to peak) |
2 mV |
| Controller Dimensions (L x W x H) |
5.2 x 5.1 x 1.5 in. |
In spite of protection circuit, the photomultiplier must not be exposed to
room light when powered. Permanent damage may result.
Optimal performance is achieved when operated in darkness after thirty
minutes of storage in darkness |
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| ORDERING INFORMATION |
| Item |
Part Number |
| Photomultiplier Tube |
PMT |
| Tube Kit |
PMT - TK |
| Filter Adapter Kit |
PMT - FK |
| Iris Diaphragm Kit |
PMT - IK |
Neutral Density Filter
(Increases
saturation level to 1.5 mW at 400 nm ) |
PMT - ND |
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Mechanical Drawing of the Photomultiplier tube.
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