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| K1713-01_15 Datasheet, PDF (5/8 Pages) Hamamatsu Corporation – Two-color detectors | |||
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Tow-color detectors
K1713/K3413-01, -002
S/N vs. chopping frequency
PbS photoconductive detector
103
Light source: black body 500 K
Incident light level: 4.8 μW/cm2
Supply voltage: 15 V
tr=200 μs
S/N
(Typ. Ta=25 °C)
PbSe photoconductive detector
104
Light source: black body 500 K
Incident energy: 16.7 μW/cm2
Supply voltage: 15 V
103
S/N
(Ta=25 °C)
S (Signal)
102
101
101
N (Noise)
102
Chopping frequency (Hz)
103
KIRDB0528EA
S (Signal)
102
N (Noise)
101
100
101
102
Chopping frequency (Hz)
103
KIRDB0441EA
Increasing the chopping frequency reduces the 1/f noise and results in an S/N improvement. The S/N can also be
improved by narrowing the noise bandwidth using a lock-in ampliï¬er.
Photo sensitivity vs. element temperature
PbS photoconductive detector
(Typ. Ta=25 °C)
103
PbSe photoconductive detector
(Typ. Ta=25 °C)
103
102
102
Light source: black body 500 K
Incident light level: 4.8 μW/cm2
Supply voltage: 15 V
Chopping frequency: 600 Hz
101
-20 -10 0 10 20 30 40 50
Element temperature (°C)
KIRDB0048EB
Light source: black body 500 K
Supply voltage: 15 V
Incident energy: 16.7 μW/cm2
Chopping frequency: 600 Hz
101
-30 -20 -10 0 10 20 30 40 50
Element temperature (°C)
KIRDB0442EB
Cooling the device enhances its sensitivity, but the sensitivity also depends on the load resistance in the circuit.
5
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