Photon counting head
The H8259 series is a photon counting head device containing a 28 mm (1-1/8") diameter side-on photomultiplier tube, high-speed photon counting circuit, and a high-voltage power supply circuit. The photomultiplier tube sensitive in the near IR region usually has a large dark count due to thermal noise but high S/N measurements can be obtained since a low-noise photomultiplier tube is selected. The high voltage supply for photomultiplier tube and the discrimination level are preset to optimum values, allowing photon counting measurement by just connecting a +5 V supply. An electronic gate circuit (shutter circuit) is also included to eliminate extraneous light such as excitation light from the measurement.
|Photocathode Area Shape||Square|
|Photocathode Area Size||4 x 20 mm|
|Wavelength (Short)||185 nm|
|Wavelength (Long)||680 nm|
|Wavelength (Peak)||400 nm|
|Dimension (W x H x D)||38.0 x 95.0 x 50.0 mm|
|Input Voltage||+4.5 to +5.5 V|
|Max. Input Voltage||6 V|
|Max. Input Current||80 mA|
|Count Senstitivity at 300 nm Typ.||2.1 x 105 s-1・pW-1|
|Count Senstitivity at 400 nm Typ.||2.6 x 105 s-1・pW-1|
|Count Senstitivity at 500 nm Typ.||1.9 x 105 s-1・pW-1|
|Count Senstitivity at 600 nm Typ.||7.5 x 104 s-1・pW-1|
|Count Senstitivity at 700 nm Typ.||1.5 x 103 s-1・pW-1|
|Count Linearity||2.5 x 106 s-1|
|Dark Count Typ.||30 s-1|
|Dark Count Max.||80 s-1|
|Pulse-pair Resolution||35 ns|
|Output Pulse Width||30 ns|
|Output Pulse Height Min.||2 V|
|Output Pulse Height Typ.||2.2 V|
|Recommended Load Resistance||50 Ω|
|Signal Output Logic||Positive logic|
|Operating Ambient Temperature||+5 to +40 ℃|
|Storage Temperature||-20 to +50 ℃|
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