R7518(2005) 查看數據表（PDF） - Hamamatsu Photonics
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R7518 Datasheet PDF : 4 Pages
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PHOTOMULTIPLIER TUBES
R7518, R7518P (For Photon Counting)
MAXIMUM RATINGS (Absolute Maximum Values)
Parameter
Value
Unit
Supply Voltage
Between Anode and Cathode
Between Anode and Last Dynode
1250
250
V
V
Average Anode Current A
0.1
mA
CHARACTERISTlCS (at 25 °C)
Parameter
Quantum Efficiency at 300 nm (Peak)
Cathode Sensitivity
Luminous B
Radiant at 410 nm (Peak)
Blue Sensitivity Index (CS 5-58)
Anode Sensitivity
Luminous C
Radiant at 400 nm
Gain D
Anode Dark Current E (After 30 min Storage in darkness)
Anode Dark Counts E
ENI (Equivalent Noise Input) F
Anode Pulse Rise Time G
Time Response D
Electron Transit Time
Transit Time Spread (TTS) H
Anode Current Stability J
Light Hysteresis
Voltage Hysteresis
R7518 for General Purpose
Min. Typ. Max.
—
29
—
120
130
—
—
85
—
—
10
—
1200 1560
—
— 10.2 × 105 —
— 1.2 × 107 —
—
0.2
2.0
—
—
—
— 2.7 × 10-17 —
—
2.2
—
—
22
—
—
1.2
—
—
0.1
—
—
1.0
—
R7518P for Photon Counting
Min. Typ. Max.
—
29
—
120
130
—
—
85
—
—
10
—
1200 1560
—
— 10.2 × 105 —
— 1.2 × 107 —
—
0.2
0.5
—
10
50
— 2.7 × 10-17 —
—
2.2
—
—
22
—
—
1.2
—
—
0.1
—
—
1.0
—
Unit
%
µA/lm
mA/W
µA/lm-b
A/lm
A/W
—
nA
s-1
W
ns
ns
ns
%
%
NOTES
A: Averaged over any interval of 30 seconds maximum.
B: The light source is a tungsten filament lamp operated at a distribution tem-
perature of 2856 K. Supply voltage is 150 V between the cathode and all
other electrodes connected together as anode.
C: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 be-
low.
D:Measured with the same supply voltage and voltage distribution ratio as
Note E after removal of light.
E: Measured at the voltage producing the gain of 1 × 106.
F: 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
(W)
S
where q = Electronic charge. (1.60 × 10-19 coulomb)
ldb = Anode dark current(after 30 minute storage) in amperes.
G = Gain.
f = Bandwidth of the system in hertz. (usually 1 hertz)
S = Anode radiant sensitivity in amperes per watt at the wave-
length of peak response
G:The rise time is the time for the output pulse to rise from 10% to 90% of the
peak amplitude when the entire photocathode is illuminated by a delta
function light pulse.
H: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 photo-
cathode is illuminated.
J: Also called transit time jitter. This is the fluctuation in electron transit time
between individual pulses in the signal photoelectron mode, and may be
defined as the FWHM of the frequency distribution of electron transit times.
K: Hysteresis is temporary instability in anode current after light and voltage
are applied.
Hysteresis =
lmax. lmin.
li
100 (%)
li
l max.
l min.
TIME
0
5
6
7 (minutes)
TPMSB0002EA
(1)Current Hysteresis
The tube is operated at 750 V with an anode current of 1 µA for 5 minutes.
The light is then removed from the tube for a minute. The tube is then
re-illuminated by the previous light level for a minute to measure the variation.
(2)Voltage Hysteresis
The tube is operated at 300 V with an anode current of 0.1 µA for 5 minutes.
The light is then removed from the tube and the supply voltage is quickly
increased to 800 V. After a minute, the supply voltage is then reduced to
the previous value and the tube is re-illuminated for a minute to measure
the variation.
Table 1:Voltage Distribution Ratio
Electrodes K Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 Dy9 P
Distribution
Ratio
1 1111 11111
SuppIy Voltage : 1000 V, K: Cathode, Dy: Dynode, P: Anode
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