Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"Pyroelectric effect"”.
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Power Converters for Piezoelectric and Pyroelectric Materials
… converters for these materials. Piezoelectric effect is a cross-coupling between mechanical property and electrical property of dielectrics. It is a reversible process where external electric potential can generate internal mechanical force while external mechanical force can also generate …
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Characterization of Novel Pyroelectrics
… due to a change of temperature is known as the pyroelectric effect and is restricted to crystalline, non-centrosymmetric and polar matter. Its main application is the utilization in infrared radiation sensors, but usage for waste heat energy harvesting or chemical catalysis is also possible. A …
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Microstructure, Tunable and Pyroelectric Properties of Laser-Ablated Ba (Zr0.25 Ti0.75) O3 Thin Films
… in infrared sensors is based on the induced pyroelectric effect, while the use of ferroelectric thin films in tunable devices is to take advantage of the dependence of dielectric constant on applied electric field. This research focuses on studying the variations of microstructures and their …
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Annealing studies of detector materials for uncooled thermal imaging
… the UK these have been principally based on the pyroelectric effect in ferroelectric materials which have been incorporated into hybrid detectors where the detector elements are machined from bulk ceramic, either lead zirconate titanate (PZT) or lead scandium tantalate (PST), and then flip-chip …
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Secondary pyroelectric and electrocaloric effects in thin films
The pyroelectric and electrocaloric effect play an important role in many applications such as energy harvesting and solid-state cooling. This dissertation focuses on the characterization of the pyroelectric and electric coefficient in thin film using novel laser-based technique. The implementation …
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Electrooptic electric field sensor for dc and extra-low-frequency measurement
… in the dielectric crystal and its shape. The effect of optical activity in 23 cubic crystals was analyzed using the concept of Poincare sphere. The cubic crystals were further characterised for the charge relaxation time constant to estimate their performance in DC field measurements. Crystals …
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Preparation and Characterization of Ferroelectric Thin Films for Tunable and Pyroelectric Applications
… studied for their wide applications in pyroelectric detectors and tunable devices. In the present work, pulsed laser deposition (PLD) technique has been employed to deposit ferroelectric Ba(Ti0.85Sn0.15)O3 (BTS) thin films and heterostructures. BTS thin films have been successfully …
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Responsive temperature and pressure sensor design for in-situ prosthesis monitoring applications based on the piezoelectric and pyroelectric effects in lead zirconate titanate
… the development of a sensor based on the pyroelectric and piezoelectric effects that can be used to measure both temperature and/or axial stress for specific use within a prosthetic socket, and more generally as a responsive temperature sensor capable of detecting high frequency skin …
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Pyroelektrický jev v technické praxi
Bakalářská práce se zabývá použitím pyroelektrického jevu jako zdroje elektrické energie. Je v ní popsán jeho matematický model, který je dále převeden do grafického programovacího prostředí Simulink. Obsahuje rešerši využití tohoto fyzikálního jevu v technické praxi a zhodnocení pro které aplikace …