2019
DOI: 10.5755/j01.eie.25.1.22731
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Ultrasonic Air Coupled Transducer Output Impedance Measurement Technique

Abstract: Estimation of the output impedance of ultrasonic transducers is required for electrical matching circuits design and for receiving amplifiers noise optimization. This paper presents a simple technique for transducer output impedance estimation using the same data acquisition system and signals that are conventionally used in non-destructive testing. A pair of ultrasonic transducers is used: one for transmission, one for reception. Received signal is recorded under low and high resistance load and transducer ou… Show more

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Cited by 4 publications
(2 citation statements)
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“…where ρ and c are the density and the sound propagation velocity for the coupling media (air was used here), A is the active transducer surface area (obtained using transducer radius a), M is the reception sensitivity, V/Pa, S P is the transmission sensitivity, expressed as the ratio of the sound pressure on transducer surface p TX to driving current I TX , Pa/A. The input impedance Z in of the amplifier and the transducer impedance Z T were measured as per [27] and used to convert the voltage registered by the amplifier V in into an open circuit voltage [14]:…”
Section: Three Transducers Reciprocity Calibration Using Combined Pla...mentioning
confidence: 99%
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“…where ρ and c are the density and the sound propagation velocity for the coupling media (air was used here), A is the active transducer surface area (obtained using transducer radius a), M is the reception sensitivity, V/Pa, S P is the transmission sensitivity, expressed as the ratio of the sound pressure on transducer surface p TX to driving current I TX , Pa/A. The input impedance Z in of the amplifier and the transducer impedance Z T were measured as per [27] and used to convert the voltage registered by the amplifier V in into an open circuit voltage [14]:…”
Section: Three Transducers Reciprocity Calibration Using Combined Pla...mentioning
confidence: 99%
“…The amplitude and the phase of the registered current and voltage signals were estimated using the Sine Wave Correlation (SWC) technique [27], using the gated part of the signal (shown in red on Fig. 9).…”
Section: Three Transducers Reciprocity Calibration Using Combined Pla...mentioning
confidence: 99%