Results 11 to 20 of about 4,479,393 (285)

Air-Coupled Low Frequency Ultrasonic Transducers and Arrays with PMN-32%PT Piezoelectric Crystals [PDF]

Sensors, 2017
Air-coupled ultrasonic techniques are being increasingly used for material characterization, non-destructive evaluation of composite materials using guided waves as well as for distance measurements.
Rymantas J. Kazys, Reimondas Sliteris, Justina Sestoke   +2 more
doaj   +2 more sources

Experimental study on lateral displacement measurement using air-coupled ultrasound transducers

Mechanical Engineering Journal, 2014
We propose a novel measurement method for directly measuring the lateral displacement of structures by using air-coupled ultrasound transducers. The normally-distributed far field of an ultrasound transducer in a lateral direction is taken advantage of ...
Iwao MATSUYA, Fumiya MATSUMOTO, Ikuo IHARA   +2 more
doaj   +2 more sources

High-Sensitivity Air-Coupled Ultrasonic Transducer Design Based on PMN-PT Bending Vibration Modes [PDF]

Sensors
Gas pipelines are a critical means of transportation in industrial production. To detect gas pipeline leaks, ultrasonic transducers with specific center frequencies and high sensitivity are required.
Junwen Deng, Xingyu Chen, Yuliang Zhu, Xiaobo Wang, Tao Han, Chengtao Luo   +5 more
doaj   +2 more sources

Air-coupled piezoelectric micromachined ultrasonic transducer array based on low-cost and large remnant polarization PZT thin film [PDF]

Scientific Reports
Due to the development of semiconductor technology, control and driving circuits for large phased arrays have become cheaper and more compact, enabling air-coupled ultrasonic transducer arrays to be applied in areas such as ultrasonic haptic feedback and
Jia-Ling Lin, Ya-Han Liu, Chien-Lun Kao, Shao-Wei Wu, Han-Jen Hsu, Hsiao-Chi Lin, Chih-Ying Li, Chun-Yuan Chen, Yeong-Her Wang, Chih-Hsien Huang   +9 more
doaj   +2 more sources

Design and Fabrication of Air-Coupled CMUT for Non-Contact Temperature Measurement Applications [PDF]

Micromachines
Compared with traditional piezoelectric transducers, Capacitive Micromachined Ultrasonic Transducers (CMUTs) have advantages such as better impedance matching with air, smaller size, lighter weight, higher sensitivity, and ease of array formation ...
Xiaobo Rui, Yongshuai Ma, Chenghao He, Chi Zhang, Zhuochen Wang, Hui Zhang   +5 more
doaj   +2 more sources

Design, Fabrication, and Characterization of a Piezoelectric Micromachined Ultrasonic Transducer with a Suspended Cantilever Beam-like Structure with Enhanced SPL for Air Detection Applications [PDF]

Micromachines
Air-coupled ultrasonic detection demands high transmission performance from piezoelectric micromachined ultrasonic transducers (PMUTs). However, existing microelectromechanical system (MEMS)-based PMUTs deliver limited output, which compromises ...
Yanyuan Ba, Yiming Li, Yuanhang Zhou
doaj   +2 more sources

Air-Coupled Ultrasonic Transducers for the Detection of Defects in Plates [PDF]

, 1996
In order to minimise the problems due to the acoustic impedance mismatch between solids and air, the non destructive testing of materials using ultrasonic transducers generally requires either contact transducers or immersion transducers to be used [1].
Castaings, M., Cawley, P., Farlow, R., Hayward, G.   +3 more
openaire   +4 more sources

Design and Fabrication of Multi-Frequency and Low-Quality-Factor Capacitive Micromachined Ultrasonic Transducers [PDF]

Micromachines
Capacitive micromachined ultrasonic transducers (CMUTs) have been developed for air-coupled applications to address key challenges such as noise, prolonged ringing, and side-lobe interference. This study introduces an optimized CMUT design that leverages
Amirhossein Moshrefi, Abid Ali, Mathieu Gratuze, Frederic Nabki   +3 more
doaj   +2 more sources

Simulation of ultrasonic lamb wave generation, propagation and detection for an air coupled robotic scanner [PDF]

, 2011
A computer simulator, to facilitate the design and assessment of a reconfigurable, air-coupled ultrasonic scanner is described and evaluated. The specific scanning system comprises a team of remote sensing agents, in the form of miniature robotic ...
Keith Worden, Walter Galbraith, Burnham, Kenneth, Hayward, Gordon, S. Gareth Pierce, Gordon Hayward, Worden, Keith, Galbraith, Walter, Spencer, Andrew, Dobie, Gordon, Pierce, S. Gareth, Gordon Dobie, Andrew Spencer, Kenneth Burnham   +13 more
core   +4 more sources

Air-coupled piezoelectric micromachined ultrasonic transducers for surface stain detection and imaging

Nanotechnology and Precision Engineering, 2022
This paper proposes an air-coupled piezoelectric micromachined ultrasonic transducer (PMUT) for detection and imaging of surface stains. A 508 kHz PMUT array is designed, fabricated, and characterized in terms of its electrical and acoustic properties ...
Sheng Sun, Jianyuan Wang, Yuan Ning, Menglun Zhang   +3 more
doaj   +1 more source