Photon counting head
The H7421 series is a photon counting head device containing a metal package photomultiplier tube having a GaAsP/GaAs photocathode and a thermoelectric cooler. The thermoelectric cooler reduces thermal noise generated from the photocathode which also offers a high quantum efficiency, allowing measurement to be made with a good S/N ratio even at very low light levels. The H7421-40 has high sensitivity on wavelength from 300 nm to 740 nm. The H7421-50 is sensitive over a wide spectral range from 380 nm to 920 nm. The photomultiplier tube is maintained at a constant temperature by monitoring the output from a thermistor installed near the photomultiplier tube and regulating the current to the thermoelectric cooler.
|Photocathode Area Shape||Round|
|Photocathode Area Size||Dia.5 mm|
|Wavelength (Short)||380 nm|
|Wavelength (Long)||920 nm|
|Wavelength (Peak)||730 nm|
|Dimension (W x H x D)||56 x 36 x 104 mm|
|Input Voltage||+4.5 to +5.5 V|
|Max. Input Voltage||6 V|
|Max. Input Current||50 mA|
|Count Senstitivity at 800 nm Typ.||5.1 x 105 s-1・pW-1|
|Count Linearity||1.5 x 106 s-1|
|Dark Count Typ.||125 s-1|
|Dark Count Max.||375 s-1|
|Pulse-pair Resolution||70 ns|
|Output Pulse Width||30 ns|
|Output Pulse Height Min.||3 V|
|Output Pulse Height Typ.||3.6 V|
|Recommended Load Resistance||50 Ω|
|Signal Output Logic||Positive logic|
|Operating Ambient Temperature||+5 to +35 ℃|
|Storage Temperature||-20 to +50 ℃|
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