Design of Low-Loss Wide-Band Ultrasonic Transducers for Noninvasive Medical Application

Souquet, Jacques; Defranould, Ph.; Desbois, J.

doi:10.1109/t-su.1979.31070

Cited by 100 publications

(25 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…7. It is clear that the sensitivity is maximized and duration pulse is minimized when the matching layer is Glassbeads (Souquet et al, 1979). Table 2 shows the optimum parameters for materials used for one, two, and three matching layers.…”

Section: Resultsmentioning

confidence: 99%

Research Papers. An Approach to Design Broadband Air Backed Piezoelectric Sensor

Ali

El-Sayed

Eid

2015

Archives of Acoustics

View full text Add to dashboard Cite

In this work, an approach to the design of broadband thickness-mode piezoelectric transducer is presented. In this approach, simulation of discrete time model of the impulse response of matched and backed piezoelectric transducer is used to design high sensitivity, broad bandwidth, and short-duration impulse response transducers. The effect of matching the performance of transmitting and receiving air backed PZT-5A transducer working into water load is studied. The optimum acoustical characteristics of the quarter wavelength matching layers are determined by a compromise between sensitivity and pulse duration. The thickness of bonding layers is smaller than that of the quarter wavelength matching layers so that they do not change the resonance peak significantly. Our calculations show that the −3 dB air backed transducer bandwidth can be improved considerably by using quarter wavelength matching layers. The computer model developed in this work to predict the behavior of multilayer structures driven by a transient waveform agrees well with measured results. Furthermore, the advantage of this this model over other approaches is that the time signal for optimum set of matching layers can be predicted rapidly.

show abstract

Section: Resultsmentioning

confidence: 99%

Research Papers. An Approach to Design Broadband Air Backed Piezoelectric Sensor

Ali

El-Sayed

Eid

2015

Archives of Acoustics

View full text Add to dashboard Cite

show abstract

“…In the meantime, a quarter wavelength backing layer with high acoustic impedance is cast on rear end of the ceramic to improve the pulseecho time duration as shown in Figure 7. According to the theory prediction [15], as the matching impedance of outer layer is Applying the acoustic impedance matching theory to the lumped circuit model of wide band transducer in Figure 6, the thickness of piezoelectric ceramic electrodes is about 0.4μm, much smaller than the transmission wavelength, so that the interface effect can be ignored in the simulation model. Figure 8 depicts the simulated transmitting transfer function (TTF) of an airback transducer with two impedance matching layers, in which the mark − Δ curve reaches the maximum bandwidth 61% as the acoustic impedance of outer matching layer 1 m Z varies from 1.5Mrayl to 4.5Mrayl.…”

Section: )mentioning

confidence: 99%

Wide bandwidth ultrasonic transducer design using a lumped oscillation coupled model

Chen

Lin

2010

Proceedings of the 2010 Symposium on Piezoelectricity, Acoustic Waves and Device Applications

View full text Add to dashboard Cite

This paper will establish a closed-coupled oscillator model of the wide bandwidth ultrasonic transducer for ultrasound image application. Referring to the acoustical impedance matching theorem, the bandwidth depend on different matching impedance of the matching layers is investigated, and then the wide bandwidth ultrasonic transducer can be obtained. In order to shorten the pulse-echo duration time, the acoustical impedance of the backing layer is tuned to fit the resolution requirement. MATLAB is implemented to model and simulate of the equivalent lumped circuit of the designed transducer. The simulated results of transmitting transfer function and pulse-echo insertion loss can agree with the experimental results. Although the modeling accuracy is a bit less than that of propagation wave, this closed-coupled oscillator model seems relatively simple and easy to understand and closer to the original physical properties of elements of transducers. It also provides a complete one-dimensional model for the transducer and can well describe the electromechanical characteristics of the transducer.

show abstract

“…1). An additional passive layer is sandwiched between the sound-absorbing backing material and the piezoelectric layer and acts as a so-called mismatching layer [14], increasing the power transmission efficiency in the forward direction.…”

Section: A Designmentioning

confidence: 99%

Transducer for harmonic intravascular ultrasound imaging

Vos

Frijlink

Droog

et al. 2005

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

View full text Add to dashboard Cite

Design of Low-Loss Wide-Band Ultrasonic Transducers for Noninvasive Medical Application

Cited by 100 publications

References 4 publications

Research Papers. An Approach to Design Broadband Air Backed Piezoelectric Sensor

Research Papers. An Approach to Design Broadband Air Backed Piezoelectric Sensor

Wide bandwidth ultrasonic transducer design using a lumped oscillation coupled model

Transducer for harmonic intravascular ultrasound imaging

Contact Info

Product

Resources

About