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 Pyroelectric Detectors Serie PEM
  with black, broadband absorption coating




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.




>> Datasheet

Zubehör

>> LEM2420
>> Pyrobox
>> Preamplifier




max. pulse power density
and
absorption (%)


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PEM 4
PEM 8
PEM11
PEM 21
PEM 34
Aperture
4 mm
8 mm
11 mm
21 mm
34 mm
Sensitivity
at 1 MOhm
500 V/J .. 1000 V/J
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
130 V/J .. 250 V/J
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
80 Hz
40 Hz
40 Hz
25 HZ
25 Hz
max. repetition rate
at 100 kOm
120 Hz
100 Hz
80 Hz
80 Hz
80 Hz
working range
(Oscilloscope)
1 µJ - 20 mJ
2 µJ - 75 mJ
3 µJ - 150 mJ
5 µJ - 500 mJ
15 µJ - 1,4 J
Dimensions
(Diameter x Length)

30mm x 47 mm
30mm x 47 mm 30mm x 47 mm 39mm x 47 mm
70mm x 47 mm