Chirp response of an active-controlled thickness-drive tunable transducer

Alwi, Hasan Adli; Carey, J.R.; Smith, Brian V.

doi:10.1121/1.428424

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…By employing conventional analysis, the relation between variables at the three ports in figure 2 can be expressed as a matrix, as shown below [34][35][36]:…”

Section: Mathematical Modelmentioning

confidence: 99%

Influence of a silver epoxy dopant on the performance of broken piezoelectric ceramic transducer based on an analytical model

Mohammed¹,

Haris²,

Nuawi³

2014

Smart Mater. Struct.

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Over the past decade, an unprecedented increase in the types of, the methods of using, and the demand for piezoelectric ceramic transducers (PCTs) has been observed in the market. These factors increase the probability of PCTs being subjected to breakage. Therefore, this study proposes a simple, low-cost procedure which uses available components to repair and reinstall five broken PCTs and then tests them as emitters and receivers in bulk and surface wave detection. An SM211 PCT with a 7.2 MHz frequency, a high damping and electromechanical coupling coefficient, and two silver electrodes were selected for the experiment. A Mason circuit was used for the procedure, the Laplace transform was used as a mathematical analysis method, and MATLAB was the technical computing language used to model the new transfer function for this type of PCT. This study proved that silver electrodes are a significant load on PCTs, particularly at high frequencies. Very good identity correlations between this mathematical and the experimental responses of the standard PCT were obtained. Later this mathematical model was used to prove the explanations provided by this research. The response of the standard PCT was compared with that of the samples of PCT that have been repaired (SPCTR). Through this comparison, many conclusions were obtained, and several recommendations were made, which can be taken advantage of by people who are interested in this field of research. Such recommendations include analyzing the response of SPCTR and explaining the types of ultrasonic tests in which SPCTR can be used.

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“…By employing conventional analysis, the relation between variables at the three ports in figure 2 can be expressed as a matrix, as shown below [34][35][36]:…”

Section: Mathematical Modelmentioning

confidence: 99%

Influence of a silver epoxy dopant on the performance of broken piezoelectric ceramic transducer based on an analytical model

Mohammed¹,

Haris²,

Nuawi³

2014

Smart Mater. Struct.

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“…This type of acoustical modulation can be accomplished, for example, by blocking movable piston vibrations using magneto-rheological liquid or other technologies. [11][12][13][14][15][16][17][18] The purpose of this research is to demonstrate the possibility of such an approach. The simulation shows that simultaneously changing the excitation sig- nal and the resonance frequency of a tunable organ pipe leads to a quick change in the radiated wave form.…”

Section: Tuning Process Simulationmentioning

confidence: 99%

“…The Helmholtz resonator is the simplest example of a lumped element resonant system. Several papers describe tuning methods, [11][12][13][14][15][16][17][18] and some examples of tunable Helmholtz resonators can be found in others ͑see Refs. 23-26͒.…”

Section: Simplest Second-order Tunable Resonant Circuitmentioning

confidence: 99%

“…Although a variety of designs for high-frequency stateswitched sources is described in the literature, [11][12][13][14][15][16][17][18] there is no good design for a state-switched transducer with a frequency smaller than 800 Hz. The state-switched transducer adequate for frequency coded signal transmission is used in communications and underwater sonar.…”

Section: Introductionmentioning

confidence: 99%

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Underwater tunable organ-pipe sound source

Morozov

Webb

2007

The Journal of the Acoustical Society of America

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A highly efficient frequency-controlled sound source based on a tunable high-Q underwater acoustic resonator is described. The required spectrum width was achieved by transmitting a linear frequency-modulated signal and simultaneously tuning the resonance frequency, keeping the sound source in resonance at the instantaneous frequency of the signal transmitted. Such sound sources have applications in ocean-acoustic tomography and deep-penetration seismic tomography. Mathematical analysis and numerical simulation show the Helmholtz resonator's ability for instant resonant frequency switching and quick adjustment of its resonant frequency to the instantaneous frequency signal. The concept of a quick frequency adjustment filter is considered. The discussion includes the simplest lumped resonant source as well as the complicated distributed system of a tunable organ pipe. A numerical model of the tunable organ pipe is shown to have a form similar to a transmission line segment. This provides a general form for the principal results, which can be applied to tunable resonators of a different physical nature. The numerical simulation shows that the "state-switched" concept also works in the high-Q tunable organ pipe, and the speed of frequency sweeping in a high-Q tunable organ pipe is analyzed. The simulation results were applied to a projector design for ocean-acoustic tomography.

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