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Photon Counting Heads
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Photon Counting Head
When light intensity becomes extremely low, light can be counted as individual photons. Photomultiplier tubes are ideal for photon counting because they exhibit excellent time resolution, high gain and yet low noise. In low-light-level measurement, photon counting has advantages over the analog detection method. For example, noise pulses can be easily separated, and high stability and a high S/N ratio obtained.
>>> Optical Blocks for PMT Modules (2, Feb, 2007)
Products Lineup
* Products are applicable to "Optical Blocks for PMT Modules".
Photon Counting Heads
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Type No.
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Spectral
Response
(nm)
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Count
Linearity
(s-1)
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Photosensitive
Area
(mm)
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Dimensions
(mm)
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Input
Voltage
(V)
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Remarks
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| H7155 Series |
300 to 850
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1.5e6
1.0e7
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φ8
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22 x 50 x 50
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+5
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Small size
Prescaler type available |
H7421 Series
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300 to 890
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1.5e6
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φ5
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56 x 36 x 104
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+5
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Built-in cooler
High quantum efficiency |
| H8259 Series |
185 to 900
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2.5e6
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4 x 20
4 x 6 (-02type)
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38 x 95 x 50
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+5
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Visible to near IR
Gate function |
| H7828 Series |
300 to 850
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1.5e6
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φ15
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26 x 50 x 56
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+5
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For portable unit |
| H7360 Series |
300 to 850
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6e6
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φ22
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φ34 x 114
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+5
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Cylindrical shape
Wide sensitive area |
| H7467 Series |
300 to 850
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1.5e6
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φ8
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35 x 50 x 60
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+5
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Photon counting circuit +
counter + CPU + interface |
| H9319 Series |
300 to 850
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2.0e7(with internal prescaler)
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φ22
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φ35 x 120
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+5
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Photon counting circuit +
counter + CPU + interface |
Spectral Responce
Spectral photon counting sensitivity example of Photon Counting Head
Precautions
Safety precautions
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Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office.
Some products listed in this catalog generate a high voltage internally. Be sure to observe the following safety
measures and take sufficient precautions to prevent possible electrical shocks.
Always turn off the power before moving, installing and inspecting the products or connecting/disconnecting the cables and connectors.
Do not modify any part of the product and do not open the housing case. Malfunctions or electrical shocks might result and the products might overheat, smoke or catch fire. |
Handling precautions
Take the following precautions when handling PMT modules.
Do not expose the photocathode of PMT modules to excessive light such as sunlight. If exposed, noise will increase and photocathode sensitivity will deteriorate.
Do not touch the light input window with bare hands. Dirt and grime on the window causes loss of optical transmittance. If the window becomes soiled with dirt or grime, wipe it clean using alcohol.
Helium will penetrate through silica (quartz) glass windows and increase noise. Avoid using or storing those PMT modules in an atmosphere where helium is present.
Carefully check that the power supply output voltage and polarity are correct.
Do not apply strong vibrations or impacts to PMT modules.
Do not apply a strong tightening force to localized sections.
Do not let moisture or dust penetrate inside.
Consult with us if you must take special countermeasures against tough conditions such as high temperatures, high humidity or strong magnetic fields.
When designing equipment using or incorporating products listed in this catalog, install safety interlocks (breakers, etc.) to prevent accidents from electrical shocks or excessive light input, etc.
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Warranty
Hamamatsu PMT modules and related products are warranted to the original purchaser for a period of one year after delivery. The warranty is limited to repair or replacement of defective products due to defects in workmanship or materials used in their manufacture.
Even if within the warranty period, the warranty shall not apply to failures due to misuse, mishandling, modification by the customer, or accidents such as natural or manmade disasters.
The customer should inspect and test all products as soon as they are delivered. |
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