The High Frequency Flexural Ultrasonic Transducer for Transmitting and Receiving Ultrasound in Air

Kang, Lei; Feeney, Andrew; Dixon, Steve

doi:10.1109/jsen.2020.2981667

Cited by 16 publications

(8 citation statements)

References 32 publications

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“…Most practical applications tend to use axisymmetric vibrational modes of the membrane, where the directivity and intensity of the generated ultrasonic wave is dependent on the particular mode used. These mode shapes have been reported in the literature [10][11][12][13][14][15]. The FUT can be driven with just a few volts and with a short-cycle excitation burst, whilst generating a comparatively high amplitude pressure wave [12,13], making it an efficient and attractive ultrasonic transducer design for a variety of industrial applications.…”

Section: A the Classical Sealed Flexural Ultrasonic Transducersupporting

confidence: 62%

“…The dynamic performance of the FUT has received significant attention [10][11][12][13][14][15], leading to a greater understanding of how FUT can be optimized for specific applications [15]. The resonance frequency of the FUT for a specific vibrational resonant mode can be mathematically predicted with high accuracy [10][11][12][13][14][15], with its dynamics dominated by the membrane's material and geometrical properties, and only slightly perturbed by bonding a thin piezoelectric disc to the membrane [16]. Most practical applications tend to use axisymmetric vibrational modes of the membrane, where the directivity and intensity of the generated ultrasonic wave is dependent on the particular mode used.…”

Section: A the Classical Sealed Flexural Ultrasonic Transducermentioning

confidence: 99%

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Design and Dynamics of Oil Filled Flexural Ultrasonic Transducers for Elevated Pressures

et al. 2022

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The flexural ultrasonic transducer has traditionally been limited to proximity measurement applications, such as car-parking systems and industrial metrology. Principally, their classical form is unsuitable for environments above atmospheric 1 bar pressure, due to an internal air cavity which creates a pressure imbalance across the transducer's vibrating membrane. This imbalance leads to physical deformation and degradation of the transducer's structure, restricting the membrane's capacity to vibrate at resonance to transmit and receive ultrasound. There is a requirement for ultrasonic sensors which can withstand environments of elevated pressure, for example in ultrasonic gas metering. Recent research demonstrated the dynamic performance of flexural ultrasonic transducers with vented structures, allowing the pressure to balance across the transducer membrane. However, a hermetically sealed transducer is a more practical and robust solution, where the internal components of the transducer, such as the piezoelectric ceramic disc, will be protected from harmful environmental fluids. In this research, the design and fabrication of a new form of flexural ultrasonic transducer for environments of elevated pressure is demonstrated, where the internal air cavity is filled with an incompressible fluid in the form of a non-volatile oil. Dynamic performance is measured through acoustic microphone measurements, electrical impedance analysis, and pulse-echo ultrasound measurement. Together with finite element analysis, stable ultrasound measurement is achieved above 200 bar in air, opening the possibility for reliable ultrasound measurement in hostile environments of elevated pressure.

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Section: A the Classical Sealed Flexural Ultrasonic Transducersupporting

confidence: 62%

Section: A the Classical Sealed Flexural Ultrasonic Transducermentioning

confidence: 99%

Design and Dynamics of Oil Filled Flexural Ultrasonic Transducers for Elevated Pressures

et al. 2022

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“…The signal processing circuit is composed of four parts: the microcontroller, the module group of the ultrasonic transducers, the multi-input and single-output multiplexer and the circuit with filtering, amplification and shaping functions [5]. The transmitting and receiving signals of the module group of the ultrasonic transducers are controlled by the microcontroller and the multi-input and single-output multiplexer.…”

Section: Circuit With Filtering Amplification and Shaping Functionsmentioning

confidence: 99%

Development and Engineering Application of the Measurement System Based on the Miniaturized Ultrasonic Transducer

Kong¹,

Zhao²,

Wang³

et al. 2022

J. Phys.: Conf. Ser.

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The iron terminals are mostly used in the small ultrasonic transducers which are connected to the circuit board by the direct or indirect welding method. Although the method is considered to be firm and reliable, the ultrasonic transducer or the whole system is easy to be damaged when the ultrasonic transducer is replaced or maintained. Moreover, the terminals of the ultrasonic transducer are easy to be oxidized. The miniaturized ultrasonic transducer with the electroplated copper terminals is innovatively designed to enhance the oxidation resistance of its terminals. Then the ultrasonic transducers are installed on the circuit board by the copper claw spring instead of welding. In addition, the waterproof miniaturized ultrasonic transducer is replaced by the fully covered waterproof sound permeable membrane and the non waterproof miniaturized ultrasonic transducer. The experimental results demonstrate that the quality of the signal transmission of the ultrasonic transducer is not affected, and the convenience of replacement and maintenance of the ultrasonic transducer is improved. With this design process, the overall waterproof performance of the system is also significantly enhanced while the system cost is reduced, market future is wide prospect.

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“…It is a type of mechanical wave that has the advantages of a strong penetrating force, good directionality, and easy access to concentrated sound energy [ 13 , 14 , 15 , 16 ]. Due to its advantages of non-contact measurement, low cost, easy operation, and rapid measurement, it has been widely used in industrial measurements, safety warnings, scientific obstacle avoidance by robots, and ultrasonic motors [ 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Particularly in distance measurement, as researchers continue to explore and further expand the ultrasonic ranging technology [ 24 , 25 , 26 , 27 , 28 ], measurement accuracy and the stability of ultrasonic ranging are more suitable for industrial control and high-level instruments.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Linear Springs’ Stiffness Factor Using Ultrasonic Sensing

Zhang

et al. 2022

Sensors

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We designed an ultrasonic testing instrument that consisted of a single-chip microcomputer module, a digital display module, and an ultrasonic sensor module, which conveniently eliminated the troubles faced by the traditional Jolly’s scale. For comparison purpose, three linear springs’ stiffness factors were measured by Jolly’s scale and by our ultrasonic testing instrument. We found that our instrument could more conveniently and in real time display the distance values between the ultrasonic ranging module and the horizontal bottom plate when loading different weights. By processing these distance data, we found that our instrument was more convenient for obtaining the linear springs’ stiffness factors and that the results were more accurate than those of Jolly’s scale. This study verified that our instrument can accurately realize the performance of Jolly’s scale under diverse temperatures and humidity levels with high data reliability and perfect stability.

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The High Frequency Flexural Ultrasonic Transducer for Transmitting and Receiving Ultrasound in Air

Cited by 16 publications

References 32 publications

Design and Dynamics of Oil Filled Flexural Ultrasonic Transducers for Elevated Pressures

Design and Dynamics of Oil Filled Flexural Ultrasonic Transducers for Elevated Pressures

Development and Engineering Application of the Measurement System Based on the Miniaturized Ultrasonic Transducer

Measurement of Linear Springs’ Stiffness Factor Using Ultrasonic Sensing

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