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4 September 2018 Pyroelectric energy conversion from Lithium Tantalum Oxide (LiTaO3) crystal evaluated by dynamic optical Chynoweth method and converter design
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Abstract
Pyroelectric effect is one of the phenomena that can convert dissipated thermal energy into useful electric energy. Pyroelectric energy conversion from Lithium Tantalum Oxide (LiTaO3) crystal is evaluated by dynamic optical Chynoweth method. To improve conversion efficiency, an efficient a.c./d.c. converter for the harvester and variable load is developed. Analysis and experimental research were conducted over a range of resistive load and chopping frequencies in order to optimize the energy harvesting process by implementing impedance matching for maximum power transfer. In this experiment, direct current (d.c.) at nA level and voltage (d.c.) of 100 mV level are measured for several frequency and loaded conditions. After comparing the results at different conditions, best output is identified for chopping frequency at around 4Hz for 20 MΩ resistive load, by providing cyclic temperature fluctuations of around 1.25 K/s on a single crystal lithium tantalum oxide (LiTaO3). The generated pyroelectric current is converted from a.c. to d.c. by a voltage doubler. Chopping frequency range between 2Hz-6Hz and load range between 10MΩ-40MΩ are found important for optimum power generation from a 0.5mm thick LiTaO3 sample with a surface area of 19.64 cm2. The potential for utilizing pyroelectric crystal in self-powered ultra-low power electronic devices are being further explored.
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Sadaf Yusuf Tahhan, Shuza Binzaid, Amar Bhalla, and Ruyan Guo "Pyroelectric energy conversion from Lithium Tantalum Oxide (LiTaO3) crystal evaluated by dynamic optical Chynoweth method and converter design", Proc. SPIE 10755, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XII, 1075515 (4 September 2018); https://doi.org/10.1117/12.2324077
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