Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 19, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/19/10/105102
Keywords
impulse circuit; electrical impedance; piezoelectric; ultrasound measurement; spectroscopy; pulse
Funding
- NINDS NIH HHS [R01 NS045236, R01 NS045236-01] Funding Source: Medline
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This paper explains the circuitry and signal processing to perform electrical impedance spectroscopy on piezoelectric materials and ultrasound transducers. Here, we measure and compare the impedance spectra of 2-5 MHz piezoelectrics, but the methodology applies for 700 kHz-20 MHz ultrasonic devices as well. Using a 12 ns wide 5 volt pulsing circuit as an impulse, we determine the electrical impedance curves experimentally using Ohm's law and fast Fourier transform (FFT), and compare results with mathematical models. The method allows for rapid impedance measurement for a range of frequencies using a narrow input pulse, digital oscilloscope and FFT techniques. The technique compares well to current methodologies such as network and impedance analyzers while providing additional versatility in the electrical impedance measurement. The technique is theoretically simple, easy to implement and completed with ordinary laboratory instrumentation for minimal cost.
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