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Pyroelectric Detectors Serie PEM
with black, broadband absorption coating
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Pyroelectric sensors can be classified as thermal detectors. They permit
independent of the wavelength of the incidence radiation, the direct
transformation of a radiation energy pulse into a voltage pulse. The detectors
are strictly built on a coaxial basis and are therefore extremely insensitive
to interference from electromagnetic radiation (pulsed gas laser).
The detectors are coated with a black absorption layer which possesses
an almost constant absorption in the wavelength range from 185 nm to 25 µm.
Particularly beneficial is the comparatively high sensitivity of the detectors
which without an additional amplifier and due to the insensitivity to
interference permits laser pulse measurements in the µJ range.
The maximum pulse repetition rate depends on the internal capacitance of
the detector as well as the load resistor. All detectors can be directly
connected using the BNC sockets to the 1 MOhm-Input of an oscilloscope. A small
load resistor can be used to obtain the highest pulse repetition rate. Repetition
rates of up to 100 Hz are then possible. Load resistors of 100 KOhm are part of
the deliverable assortment. The corresponding sensitivity of the sensors is also specified.
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>> Datasheet
Zubehör
>> LEM2420
>> Pyrobox
>> Preamplifier
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max. pulse power density
and
absorption (%)
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click image for bigger version
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PEM 4
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PEM 8
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PEM11
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PEM 21
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PEM 34
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Aperture
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4 mm
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8 mm
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11 mm
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21 mm
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34 mm
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Sensitivity
at 1 MOhm |
500 V/J .. 1000 V/J
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200 V/J .. 500 V/J |
100 V/J .. 400 V/J |
50 V/J .. 150 V/J |
20 V/J .. 70 V/J |
Sensitivity
at 100 kOhm
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130 V/J .. 250 V/J
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50 V/J .. 200 V/J |
50 V/J .. 150 V/J |
30 V/J .. 80 V/J |
10 V/J .. 40 V/J |
max. repetition rate
at 1 MOhm
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80 Hz
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40 Hz
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40 Hz
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25 HZ
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25 Hz
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max. repetition rate
at 100 kOm
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120 Hz
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100 Hz
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80 Hz
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80 Hz
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80 Hz
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working range
(Oscilloscope)
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1 µJ - 20 mJ
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2 µJ - 75 mJ
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3 µJ - 150 mJ
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5 µJ - 500 mJ
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15 µJ - 1,4 J
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Dimensions
(Diameter x Length)
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30mm x 47 mm
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30mm x 47 mm |
30mm x 47 mm |
39mm x 47 mm
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70mm x 47 mm
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