Print Email Facebook Twitter A temperature oscillation instrument to determine pyroelectric properties of materials at low frequencies: Towards elimination of lock-in methods Title A temperature oscillation instrument to determine pyroelectric properties of materials at low frequencies: Towards elimination of lock-in methods Author Khanbareh, H. Schelen, J.B.J. Van der Zwaag, S. Groen, W.A. Faculty Aerospace Engineering Department Aerospace Structures & Materials Date 2015-10-15 Abstract Pyroelectric properties of materials can be accurately determined by applying a new digital signal processing method on the discrete sampled data obtained with a temperature oscillation technique. The pyroelectric coefficient is calculated from the component of the generated current 90? out of phase with respect to the sinusoidal temperature wave. The novelty of the proposed approach lies in the signal analysis procedure which implements a simple Fast Fourier transform that filters residual noise through convolution, and calculates the phase difference between the peaks of the temperature and current waves. The new idea requires relatively simple hardware and enables very accurate measurement of the pyroelectric coefficient of materials at ultra low frequencies, 1–250 mHz, without using costly lock-in amplifiers. To reference this document use: http://resolver.tudelft.nl/uuid:e599bcd2-dcff-4cfa-8c6c-09b132c06f1b Publisher American Institute of Physics ISSN 0034-6748 Source https://doi.org/10.1063/1.4932678 Source Review of Scientific Instruments, 86 (10), 2015 Part of collection Institutional Repository Document type journal article Rights © 2015 AIP Files PDF 321623.pdf 752.7 KB Close viewer /islandora/object/uuid:e599bcd2-dcff-4cfa-8c6c-09b132c06f1b/datastream/OBJ/view