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Photosensor module



The H7844 is a photosensor module consisting of a newly developed high sensitivity side-on photomultiplier tube, a high-voltage power supply circuit and a thermoelectric cooler. Cooling is super-efficient in the H7844 because the thermoelectric cooler is directly coupled to the photocathode of the photomultiplier tube. This also drastically reduces thermal noise (thermal electrons) emitted from the photocathode to allow making accurate measurements with a high signal to noise ratio even at very low light evels. As a result of cooling, dark current reduces down to 1/50 at room temperature after only 3 minutes of cooling. Besides shorter cooling time and lower power consumption compared to conventional methods that cool the entire photomultiplier tube, the H7844 completely eliminates the problem of condensation during cooling.

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Photocathode Area Shape Square
Photocathode Area Size 9 x 14 mm
Wavelength (Short) 185 nm
Wavelength (Long) 900 nm
Wavelength (Peak) 400 nm
Dimension (W x H x D) 48.0 x 106.0 x 63.0 mm
Input Voltage +11.5 to +15.5 V
Max. Input Voltage 18 V
Max. Input Current 40 mA
Max. Output Signal Current 58 μA
Max. Control Voltage 1.2 V
Recommended Control Voltage Adjustment Range +0.3 to +1.1 V
[Cathode] Luminous Sensitivity Min. 140 μA/lm
[Cathode] Luminous Sensitivity Typ. 300 μA/lm
[Cathode] Blue Sensitivity Index (CS 5-58) Typ. 9
[Cathode] Red/White Ratio Typ. -
[Cathode] Radiant Sensitivity Typ. 76 mA/W
[Anode] Luminous Sensitivity Min 400 A/lm
[Anode] Luminous Sensitivity Typ. 3000 A/lm
[Anode] Radiant Sensitivity Typ. 7.6 x 105 A/W
[Anode] Dark Current (after 30min.) Typ. 0.1 nA
[Anode] Dark Current (after 30min.) Max. 0.5 nA
[Time Response] Rise Time Typ. 2.2 ns
Ripple Noise (peak to peak) Max. 0.5 mV
Settling Time Max. 0.2 s
Operating Ambient Temperature +5 to +40 ℃
Storage Temperature -20 to +50 ℃
Weight 290 g

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