Ultrasonic transducers and transducer arrays for applications in air

Manthey, W.; Kroemer, Ν.; Mágori, V.

doi:10.1088/0957-0233/3/3/001

Cited by 133 publications

(58 citation statements)

References 14 publications

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“…Air-coupled flexural transducers are typically used for low power proximity measurements [23], e.g. in parking sensors, as well as for high power ultrasonics [24], [25].…”

Section: Introductionmentioning

confidence: 99%

Experimental and simulation characterisation of flexural vibration modes in unimorph ultrasound transducers

2016

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Abstract-Two unimorph flexural transducer designs are proposed and tested with regard to mode shapes and frequencies. The transducers consist of a passive metal cap structure, and a thin piezoelectric disc rigidly bonded to the inside. Extensive finite element modelling, and experimental 2D, time-resolved displacement measurements were done to characterise the transducers flexural properties, and to compare them to the analytical solutions of thin vibrating plates. Emphasis was put on characterising the passive layer of the unimorph structure, before bonding the piezoelectric element, to understand how the active element affects the behaviour of the flexing plate. A high power Nd:YAG laser was used to actuate the metal plate (non-contact), and the frequency content of the resulting displacement signal was analysed to identify the flexural modes. The non-axisymmetric modes, which are conventionally disregarded because of their unfavourable acoustic properties, were also taken into account. There was excellent agreement between the experimental results and the FE simulation data. There was good agreement with the analytical edge clamped plate model, but with some notable deviations, which have not previously been identified or commented upon. Specifically, the second axisymmetric mode is split into three separate modes, which is not explained by the traditional theory of plates. The analysis is similar to that of contemporary pMUT research, but with the proposed macroscopic dimensions and passive metal layer making the transducer industrially robust, cheap and easy to manufacture, and more suitable for a different range of applications where these aspects are of importance.

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“…Air-coupled flexural transducers are typically used for low power proximity measurements [23], e.g. in parking sensors, as well as for high power ultrasonics [24], [25].…”

Section: Introductionmentioning

confidence: 99%

Experimental and simulation characterisation of flexural vibration modes in unimorph ultrasound transducers

2016

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“…High power UTs for applications in air are mainly of capacitive type (CUT). Advantages of CUTs are their high transfer coefficient (high transmitting efficiency in air) in combination with a wide bandwidth and the simple design that is reflected in their low cost (Manthey et al 1992 andRafiq et al 1991). Figure 2.3 shows the CUT used in the present setup (SensComp, Inc.) with its large noise generating diaphragm of about 40mm and its DC and AC power supply.…”

Section: Methodsmentioning

confidence: 99%

Optically interrogated MEMS pressure sensor array

et al. 2011

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A novel pressure measurement technique is developed with the objective to simplify wind tunnel investigations while providing full field measurement capability with highest measurement performance. The static pressure distributions are recorded by interferometric means using an array of silicon diaphragm microresonators as pressure sensing elements. They are remotely excited into free vibration using a capacitive ultrasound transducer (CUT) transmitting high power narrow band (50 -80kHz) acoustic noise. Dependent on their quasi-static deflection caused by a pressure load the resonance frequency varies with an average pressure sensitivity of 3Hz/Pa at 70kHz. Further requirements for the system performance are a maximum pressure, temporal and spatial resolution of 0.2% of FS (10kPa), 1Hz and 5mm, respectively.

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“…Ultrasound is not only useful to bat, in many industry and research fields, such as NonDestructive Evaluation (NDE), medical imaging, obstacle identification, acoustic microscopy and so on, it plays also an important roll [1][2]. One attractive feature of ultrasound is that it can provide inside information of the object without contact on it.…”

Section: Ultrasonic Transducer -An Overviewmentioning

confidence: 99%

“…Although optical remote sensors provide similar capabilities even at much greater distance, their effectiveness depends heavily on the optical property (transparency, roughness, orientation etc.) of the reflecting surface [2]. Moreover, in harsh industrial environment, dust and vapor may also present influences.…”

Section: Ultrasonic Transducer -An Overviewmentioning

confidence: 99%