Open AccessA temperature oscillation instrument to determine pyroelectric properties of materials at low frequencies: Towards elimination of lock-in methods
Author(s) -
Hamideh Khanbareh,
J. B. J. Schelen,
Sybrand van der Zwaag,
Pim Groen
Publication year - 2015
Publication title -
review of scientific instruments
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.605
H-Index - 165
eISSN - 1089-7623
pISSN - 0034-6748
DOI - 10.1063/1.4932678
Subject(s) - pyroelectricity , lock in amplifier , oscillation (cell signaling) , signal (programming language) , materials science , noise (video) , convolution (computer science) , amplifier , temperature measurement , acoustics , signal processing , computer science , optoelectronics , digital signal processing , physics , dielectric , genetics , cmos , quantum mechanics , artificial intelligence , machine learning , biology , artificial neural network , computer hardware , image (mathematics) , ferroelectricity , programming language
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
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