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Energy Sensor Heads with black absorption coating Pyroelectric sensors can be classified as thermal detectors. They permit independent of the wavelength of the incidence radiation, the direct transformation of the 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. A particular advantage is the comparatively high sensitivity of these detectors enable a laser pulse measurements in the µJ range. The maximum pulse repetition rate depends on the internal capacitance of the detector as well as on the load resistor. All detectors can be directly connected using the BNC socket to the 1 MΩ-Input of an oscilloscope. A lower load resistor can be used to obtain higher pulse repetition rate. Repetition rates of up to 100 Hz are then possible. A load resistor of 100 KΩ is part of the set. The corresponding sensitivity of the sensors for both resistors is specified. output for two different load resistors 50 ms / DIV typical output of a pyroelectric detector Corresponding to the range of possible applications detectors with diameters from 4 to 45 mm are available to purchase. We advise to choose a detector with an area slightly larger than the beam cross section. Scitec Instruments Ltd · Bartles Industrial Estate · North Street · Redruth · TR15 1HR · United Kingdom Tel: +44 (0)1209 314 608 · Fax: +44 (0)1209 314 609 · www.scitec.uk.com · scitec@scitec.uk.com

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The maximum load allowed is determined by the absorption layer (too high a power density on the surface causes damage) as well as the sensor material (the sensor temperature must remain under certain tolerance limits). This leads to limits not only for the power density during a pulse (MΩ/cm2), but also for safety working area zulässiger Arbeitsbereich thermische Zeitkonstante thermal time constant power density [W/cm²] max. Impulsleistungsdichte [W/cm²] energy density[J/cm²] Energiedichte [J/cm²] The pyroelectric effect facilitates generally only the measurement of temperature change. All...

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