The influence of heat exchange between a sensitive element and its surroundings on the specific detectivity of pyroelectric detectors |
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| Institution: | 1. DIAS Forschungs- und Entwicklungslabor für Angewandte Sensorik GmbH, Bergstrasse 69, D01069 Dresden, Germany;2. Institut für Festkörperelektronik, Technische Universität Dresden, Mommsenstrasse 13, D01062 Dresden, Germany;1. Berlin Joint EPR Lab, Institute for Nanospectroscopy, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraβe 5, 12489 Berlin, Germany;2. Department of Chemistry, Box 351700, University of Washington, Seattle, WA 98195, United States;3. Institute Methods and Instrumentation for Synchrotron Radiation Research, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany;4. Berlin Joint EPR Lab, Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany;1. Graduate Program of Chemical Engineering, Department of Chemical Engineering, Federal University of São Carlos, C.P. 676, 13565-905 São Carlos, São Paulo, Brazil;2. Department of Chemical Engineering, Federal University of São Carlos, C.P. 676, 13565-905 São Carlos, São Paulo, Brazil;1. International Tomography Center, Institutskaya 3A, Novosibirsk 630090, Russia;2. Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russia;3. Technische Universität Darmstadt, Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Alarich-Weiss-Straße 8, Darmstadt 64287, Germany;1. Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, School of Chemistry & Chemical Engineering, Huaiyin Normal University, Huaian 223300, PR China;2. Faculty of Chemistry, Northeast Normal University, Changchun 130024, Jilin, PR China |
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| Abstract: | The specific detectivity of pyroelectric sensors at low frequencies is mainly influenced by the thermal conditions within the sensor. The temperature noise caused by heat exchange between the sensitive element and its surroundings is transformed into an increase of the dielectric loss due to electrothermal coupling. The complex normalized current responsivity is used to calculate the influence of thermal conditions. While the absolute value ¦TR¦ gives the frequency response of the sensitivity, the additional dielectric loss tan δT is deduced from the imaginary part. The loss due to electrothermal coupling tan δT exceeds the dielectric intrinsic loss tan δi for most sensor structures within the frequency range up to 100 Hz. Thus, the maximum attainable specific detectivity of a pyroelectric sensor at normal operation frequencies is dependent on its construction rather than on the material parameter dielectric intrinsic loss tan δi which is frequently referred to. The effect of electrothermal coupling can be employed in sensors with reduced sensitivity at low frequencies as used for FTIR-devices. |
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