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Gated MCP-PMT unit

C13068

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Measuring a distance by detecting reflected light from a object located at long distance. Gate function is used to measure the distance.

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Features

  • High detection efficiency
  • Excellent time resolution
  • Low gate induced noise

Applications

  • SLR (Satellite Laser Ranging)
  • General laser ranging

Specifications

GENERAL

Parameter Description / Value Unit
Spectral response range 280 to 720 nm
Wavelength of peak quantum efficiency range 480 to 530 nm
Input window Material Borosilicate glass -
Photocathode Material GaAsP -
Minimum effective diameter 10 mm
AC input 100 to 240 V

MAXIMUM RATINGS

Parameter Description / Value Unit
Supply voltage(*1) -2200 V
Average anode current 100 nA
Pulsed peak current 350 mA
Ambient temperature (Operating and storage) 0 to +40 °C

CHARACTERISTICS

Parameter Min. Typ. Max. Unit
Photocathode sensitivity Luminous sensitivity(*2) 400 700 - μA/lm
Quantum efficiency at 532 nm(*3) 30 40 - %
Gain (at -2000 V) 4.0 × 105 - - -
Anode dark count (+25 °C)(*4) - 1.0 × 104 5.0 × 105 s-1
Time response Rise time(*5) - 180 - ps
Fall time(*6) - 400 -
I.R.F. (FWHM)(*7) - 80 -

GATING CHARACTERISTICS

Parameter Description / Value Unit
Gate input signal Signal level Gate on: +5 / Gate off: 0 V
Repetition frequency (Max.) 5 kHz
Impedance 50 Ω
Gating time 100 ns to 50 μs -

Notes

*1: The supply voltage will be determined between -1800 V to -2200 V in order to satisfy the specification for luminous gain. This value is referred on the test data sheet for each tube.

*2: The light source used to measure the luminous sensitivity is a tungsten filament lamp operated at a distribution temperature of 2856 K. The incident light intensity is 10-4 lm and 100 V is applied between the photocathode and all other electrodes connected as an anode.

*3: Measured at the peak sensitivity wavelength.

*4: At 30 min after high voltage is applied

*5: This is the mean time difference between the 10 % and 90 % amplitude points on the output waveform for full cathode illumination.

*6: This is the mean time difference between the 90 % and 10 % amplitude points on the tailing edge of the output waveform for full cathode illumination.

*7: IRF stands for Instrument Response Function which is a convolution of the δ pulse function (H(t)) of the measuring system and the excitation function (E(t)) of a laser. The I.R.F. is given by the following formula:
I.R.F. = H(t) × E(t)
We specify the I.R.F. as an FWHM of the time distribution taken by using the measuring system in Figure 2 that is Hamamatsu standard IRF measurement. It can be temporary estimated by the following equation:
(I.R.F. (FWHM))2 = (T.T.S.)2 + (Tw)2 + (Tj)2
where Tw is the pulse width of the laser used and Tj is the time jitter of all equipments used. An I.R.F. data is provided with the tube purchased as a standard.
Transit-time spread (T.T.S.) is the fluctuation in transit time between individual pulse and specified as an FWHM (full width at half maximum) with the incident light having a single photoelectron state.

Dimensional outline (Unit:mm)

MCP-PMT

C13068


Gate driver

C13068


High voltage power supply

C13068

Connection example

C13068

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