R2949(1998) Ver la hoja de datos (PDF) - Hamamatsu Photonics
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R2949 Datasheet PDF : 4 Pages
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PHOTOMULTIPLIER TUBE R2949
MAXIMUM RATINGS (Absolute Maximum Values at 25°C)
Parameter
Value Unit
Between Anode and Cathode
Supply Voltage
Between Anode and Last Dynode
1250 Vdc
250
Vdc
Average Anode Current A
0.1
mA
Ambient Temperature
-80 to +50 °C
CHARACTERISTICS (at 25°C)
Parameter
Min.
Quantum
at 255nm
—
Efficiency
Luminous B
140
at 194nm
—
Cathode
at 254nm
—
Sensitivity
Radiant at 400nm
—
at 633nm
—
at 852nm
—
Red/White Ratio C
0.1
with R-68 Filter
Blue D
—
Luminous E
1000
at 194nm
—
Anode
at 254nm
—
Sensitivity
Radiant at 400nm
—
at 633nm
—
at 852nm
—
Gain E
—
Anode Dark Counts F
at +25°C
—
at -20°C
—
Anode Dark Current F
—
ENI (Equivalent Noise Input) G
—
Anode Pulse
Time
Response E
Rise Time H
Electron Transit Time J
—
—
Anode Current Current Hysteresis
—
Stability K
Voltage Hysteresis
—
Typ. Max. Unit
25.3
—
%
200
— µA/lm
18
— mA/W
52
— mA/W
68
— mA/W
41
— mA/W
3.5
— mA/W
0.3
—
—
7.5
— µA/lm-b
2000 — A/lm
1.8 × 105 — A/W
5.2 × 105 — A/W
6.8 × 105 — A/W
4.1 × 105 — A/W
3.5 × 104 — A/W
1.0 × 107 —
—
300 500 cps
3
— cps
2
25
nA
1.2 × 10-16 —
W
2.2
—
ns
22
—
ns
0.1
—
%
1.0
—
%
Table 1: Voltage Distribution Ratio
Electrodes K Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 Dy9 P
Distribution
Ratio
1111111111
Supply Voltage= 1000Vdc
K: Cathode, Dy: Dynode, P: Anode
NOTES
A: Averaged over any interval of 30 seconds maximum.
B: The light source is a tungsten filament lamp operated at
a distribution temperature of 2856K. Supply voltage is
100 volts between the cathode and all other electrodes
connected together as anode.
C: Red/white ratio is the quotient of the cathode current
measured using a red filter interposed between the light
source and the tube by the cathode current measured
with the filter removed under the same conditions as
Note B.
D: The value is cathode output current when a blue filter
(Corning CS 5-58 polished to 1/2 stock thickness) is
interposed between the light source and the tube under
the same conditions as Note B.
E: Measured with the same light source as Note B and with
the anode-to-cathode supply voltage and voltage
distribution ratio shown in Table 1.
F: Measured with the same supply voltage and the voltage
distribution ratio as Note E after 30 minute storage in
the darkness.
G: ENI is an indication of the photon limited signal-to-noise
ratio. It refers to the amount of light in watts to produce
a signal-to-noise ratio of unity in the output of a
photomultiplier tube.
ENI =
2q•ldb•G•∆f
S
where q = Electronic charge (1.60 × 10-19 coulomb)
ldb = Anode dark current (after 30 minute storage)
in darkness) in amperes
G = Gain
∆f = Bandwidth of the system in hertz. 1 hertz is
used.
S = Anode radiant sensitivity in amperes per watt
at the wavelength of peak response.
H: The rise time is the time for the output pulse to rise from
10% to 90% of the peak amplitude when the entire pho-
tocathode is illuminated by a delta function light pulse.
J: The electron transit time is the interval between the
arrival of delta function light pulse at the entrance
window of the tube and the time when the anode output
reaches the peak amplitude. In measurement, the
whole photocathode is illuminated.
K. Hysteresis is temporary instability in anode current after
light and voltage are applied.
Ii
Imin. Imax.
0
5
6
7 (MINUTES) TIME
Hysteresis = Imax. - Imin. × 100 (%)
Ij
(1) Current Hysteresis
The tube is operated at 750 volts with an anode current of 1
microampere for 5 minutes. The light is then removed from
the tube for a minute. The tube is then re-illuminated at the
previous light level for a minute to measure the variation.
(2)Voltage Hysteresis
The tube is operated at 300 volts with an anode current of
0.1 microampere for 5 minutes. The light is then removed
from the tube and the supply voltage is quickly increased to
800 volts. After a minute, the supply voltage is reduced to
the previous value and the tube is re-illuminated for a
minute to measure the variation.
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