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A Review of Acoustic Impedance Matching Techniques for Piezoelectric Sensors and Transducers [PDF]
Sensors, 2020 The coupling of waves between the piezoelectric generators, detectors, and propagating media is challenging due to mismatch in the acoustic properties. The mismatch leads to the reverberation of waves within the transducer, heating, low signal-to-noise ...
Vivek T. Rathod
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Modelling Turbine Acoustic Impedance [PDF]
International Journal of Turbomachinery, Propulsion and Power, 2021 We quantify the sensitivity of turbine acoustic impedance to aerodynamic design parameters. Impedance boundary conditions are an influential yet uncertain parameter in predicting the thermoacoustic stability of gas turbine combustors.
James Brind, Graham Pullan
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Enhancement of Ultrasonic Transducer Bandwidth by Acoustic Impedance Gradient Matching Layer. [PDF]
Sensors (Basel), 2022 High-performance broadband ultrasound transducers provide superior imaging quality in biomedical ultrasound imaging. However, a matching design that perfectly transmits the acoustic energy between the active piezoelectric element and the target medium ...
Zhu K +6 more
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Stabilization of a p-u Sensor Mounted on a Vehicle for Measuring the Acoustic Impedance of Road Surfaces. [PDF]
Sensors (Basel), 2020 The knowledge of the acoustic impedance of a material allows for the calculation of its acoustic absorption. Impedance can also be linked to structural and physical proprieties of materials.
Bianco F +5 more
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Acoustic impedance-based surface acoustic wave chip for gas leak detection and respiratory monitoring [PDF]
Communications EngineeringAcoustic impedance enables many interesting acoustic applications. However, acoustic impedance for gas sensing is rare and difficult. Here we introduce a micro-nano surface acoustic wave (SAW) chip based on the acoustic impedance effect to achieve ultra ...
Baile Cui +7 more
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Journal of Petroleum Exploration and Production Technology, 2019 Structural interpretation and inversion analysis were used to characterize hard-to-image reservoirs, to predict subsurface interwell reservoir properties for optimum reservoir heterogeneity description, and to fine-tune drilling locations in ‘DJ’ Field ...
Ayodeji Alabi, Pius Adekunle Enikanselu
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Acoustic impedance matched buffers enable separation of bacteria from blood cells at high cell concentrations. [PDF]
Sci Rep, 2018 Sepsis is a common and often deadly systemic response to an infection, usually caused by bacteria. The gold standard for finding the causing pathogen in a blood sample is blood culture, which may take hours to days. Shortening the time to diagnosis would
Ohlsson P +3 more
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Acoustic behavior of composites with gradient impedance
Materials & Design, 2020 Conventional acoustic materials with uniform media which are of fixed impedance and density are unable to satisfy the requirements of the development of modern acoustic technology in volume, weight, pressure resistance and stealth performance.
Yiwen Feng, Jing Qiao, Longqiu Li
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Generalized acoustic impedance metasurface
Communications PhysicsImpedance theory has become a favorite method for metasurface design as it allows perfect control of wave properties. However, its functionality is strongly limited by the condition of strict continuity of normal power flow.
Yu-Ze Tian +3 more
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The influence of impedance mismatch of the medium with gradient change of impedance on acoustic characteristics [PDF]
MATEC Web of Conferences, 2019 Medium with gradient change of acoustic impedance is a new type acoustic structure. It is composed of several materials and has a continuous gradient composition and structure whose specific acoustic impedance varies smoothly across the layer.
Hu Bo, Wang Moran, Du Yimei
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