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Vector Pyroelectric Detectors
Vector Pyroelectric Detectors, as with all Scientech detectors, have our traditional quality built in and offer futuristic features and performance. A variety of detectors are available including the unique high damage threshold HD and HDX models which can withstand energy densities up to 1.4 J/cm2 and 12 J/cm2 respectively. High resolution HR detectors can measure repetition rates up to 4 kHz and resolve energy readings to 3 nJ.
The heart of the pyroelectric joulemeter, a sensitive detector of pulsed radiation, is the pyroelectric element. This element contains a temperature sensitive crystal which exhibits spontaneous electric polarization when exposed to the sensible heat generated by absorbed modulated radiation. The polarization is measured as a voltage at the electrodes which are attached to the crystal. This voltage is proportional to the laser energy level being absorbed. Since no power is required to drive the joulemeters, they can be directly connected to an oscilloscope as well as a Vector Synenergy Indicator. Futuristic Vector detectors are available with normal and slim profiles in highly absorbing, high rep rate, and high damage threshold models.
The P and SP models utilize a unique, durable, highly absorbing black coating which yields the flattest spectral response from the UV to the mid IR with reflection limited over the entire spectral region as indicated in Figure 1 (above) for the specifications. The high damage HD and HDX models are unique in pyroelectric measurement since they yield unsurpassed damage specifications. The HF high rep rate models have an energetic, partially absorbing, partially reflecting chromium coating. This coating is inherently fast and detects individual pulse energies at high repetition rates. The high resolution HR models are capable of low energy detection with noise equivalent energy levels down to 3 nJ on the most sensitive model. To accomplish accurate readings at such low energy levels, each HR detector contains a preamplifier powered by a 9 volt battery. This internal battery supplies noise-free power to the amplifying circuit. Inaccurate readings caused by low battery conditions are immediately and clearly recognized by a low battery warning LED light located on the top of the detector. All detectors come with a 1.27 cm (0.5") diameter x 8.89 cm (3.5") long post for mounting to an optical table and a BNC interconnect cable. A base (Model 301-019) for holding the detector/mounting post assembly upright is also available.
An optimum calibration of each detector is ensured by Scientech's highly trained and skilled service team. These experts use an electrically calibrated Scientech calorimeter/indicator system which has been NIST certified as the transfer standard. The energy of Scientech's YAG laser is accurately measured by the NIST certified calorimeter system and transferred to each Vector pyroelectric detector. This dependable calibration procedure generates a reliable certificate of calibration which accompanies each Vector joulemeter system and detector.
Excessive energy or peak power density can damage any Vector pyroelectric detector. See Figure 2 (above) for safe operating limits. If your calculated specifications exceed those provided in Figure 2 and the specification table, optical attenuation is required. Scientech provides a damage test slide with each detector (except HD and HDX models) for preoperation damage testing.