Volumetric characterization of ultrasonic transducers for gas flow metering

Hoffmann, Maik; Unger, Alexander; Ho, Min-Chieh; Park, Kwan Kyu; Khuri‐Yakub, Butrus T.; Kupnik, Mario

doi:10.1109/ultsym.2013.0336

Cited by 13 publications

(12 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All measurements are done in a standard laboratory using a 3D stage [13] at ambient temperature and normal pressure of one atmosphere. The measurements are taken only with burst signals, to avoid standing waves and to minimize reflections.…”

Section: B Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Versatile air-coupled phased array transducer for sensor applications

et al. 2015

Self Cite

View full text Add to dashboard Cite

We introduce a versatile one-dimensional (1D) air-coupled phased array transducer device operating at 40 kHz. It allows both -transmit beam steered ultrasound at high sound pressure level and it can sense beam steered ultrasound. This device opens the door to many new sensory applications. Conventionally, low frequency sensor array design for air-coupled application was not possible due to the inter element spacing (also referred as pitch) criteria that needs to be satisfied for given applications. We overcome this limitation by introducing a smart packaging layer that separates the acoustic aperture from the actual radiating aperture of the ultrasonic transducer. By doing this, we ensure that the half wavelength criteria is fulfilled. The proposed new design leads to a wide operation range without any undesirable grating lobes. A proof of concept prototype device was built and its performance evaluated in the laboratory. An impressive 130 ± 1 dB sound pressure level (SPL) was observed at a distance of 1 m. The prototype also was capable of steering approximately 110 • in total, in both transmit and receive mode of operation.

show abstract

Section: B Measurementsmentioning

confidence: 99%

“…4) along a half circle with a radius of 35 cm using a 3D-stage [13]. Hence, the directivity pattern are measured along this half circle from −90 • to 90 • in 0.2 • steps.…”

Section: B Measurementsmentioning

confidence: 99%

Versatile air-coupled phased array transducer for sensor applications

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to (2) and with r 1 and ϕ 1 describing the radius and angle to the integration point on the transmitter, we obtain the final expression for the Euclidian distance…”

Section: Theorymentioning

confidence: 99%

“…Thus, we used a precise volumetric measurement system and for all experiments in which a calibrated microphone acted as receiver, we used the proper freefield corrections [2]. The microphone had an aperture size of 3 mm (B&K Type 4138, Skodsborgvej, Denmark).…”

Section: Validationmentioning

confidence: 99%

“…Examples are arbitrary pitch-catch-based acoustic measurement systems, such as the optimization of anemometers and ultrasonic flow meter geometries for the zero velocity case as a design starting point; hydrophone measurements in liquids [1]; and transducer characterization systems using calibrated microphones [2], or with receiving ultrasonic transducers that are smaller than the transmitting transducer, as for example shown in [3].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Calculation of diffraction loss between non-co-axial ultrasonic transducer configurations

Golinske

Hoffmann

Gupta

et al. 2013

2013 IEEE International Ultrasonics Symposium (IUS)

Self Cite

View full text Add to dashboard Cite

We derive and validate a quadruple integral expression for calculating the diffraction loss in an isotropic propagation medium between circular ultrasonic transducers with time-harmonic radiation. The distinctive feature is the generic non-coaxial configuration with arbitrary transducer size and orientation. By performing several measurements, we validate the integral expression and we demonstrate that nowadays it is feasible to perform the required numerical integration to obtain the diffraction loss over an entire volumetric sound pressure field on a state-of-the-art personal computer with reasonable computation time on the order of a few minutes only. Excellent agreement between calculated results and experiments prove the approach and the generic nature of our expression ensures its wide and simple applicability for efficient diffraction loss calculations.

show abstract