scholarly journals Porous Piezoelectric transducer for the low frequency of 50kHz.

1993 ◽  
Vol 20 (2) ◽  
pp. 92-94
Author(s):  
Koichi MIZUMURA ◽  
Yoshiaki KURIHARA ◽  
Susumu KUMAMOTO ◽  
Hiroshi OHASHI
Keyword(s):  
Piezoelectric Transducer ◽  
Low Frequency

Low‐frequency piezoelectric‐transducer applications of ZnO film

1974 ◽  
Vol 25 (1) ◽  
pp. 10-11 ◽  
Author(s):  
Tadashi Shiosaki ◽  
Akira Kawabata
Keyword(s):  
Piezoelectric Transducer ◽  
Low Frequency ◽  
Zno Film

Energy harvesting with a cymbal type piezoelectric transducer from low frequency compression

2012 ◽  
Vol 28 (4) ◽  
pp. 214-219 ◽  
Author(s):  
Jaakko Palosaari ◽  
Mikko Leinonen ◽  
Jari Hannu ◽  
Jari Juuti ◽  
Heli Jantunen
Keyword(s):  
Energy Harvesting ◽  
Piezoelectric Transducer ◽  
Low Frequency ◽  
Frequency Compression

Low-Frequency Piezoelectric-Transducer Applications of ZnO Film

1974 ◽  
Author(s):  
Tadashi Shiosaki ◽  
Yoshio Yasumoto ◽  
Hideharu Ieki ◽  
Akira Kawabata
Keyword(s):  
Piezoelectric Transducer ◽  
Low Frequency ◽  
Zno Film

scholarly journals DETERMINATION OF THE ACTUAL AREA OF DRY ACOUSTIC CONTACT IN THE SYSTEM “TRANSDUCER–PRODUCT” IN LOW-FREQUENCY DEFECTOSCOPY

2019 ◽  
pp. 5-15
Author(s):  
O. G. Bondarenko
Keyword(s):  
Piezoelectric Transducer ◽  
Low Frequency ◽  
Piezoelectric Transducers ◽  
Static Force ◽  
Pipe Surface ◽  
Directional Waves ◽  
Dry Contact ◽  
Acoustic Contact ◽  
Acoustic Antenna

The conditions for the emission of acoustic energy into the pipeline environment and the reception of reflected signals from inconsistencies in dry acoustic contact cause certain dimensions of the actual contact area between the transducers and the pipe surface. The basic approaches to the determination of the actual area of ​​dry acoustic contact between the surfaces of the piezoelectric transducer and the pipe are formulated under the influence of constant static force of pressing the surfaces in low-frequency flaw detection using ultrasonic directional waves. Expressions have been proposed to determine the area of ​​actual acoustic contact for single and numerical micro projections of the pipe surface. The principle of quality control of balancing of acoustic antenna piezoelectric transducers in modern systems of low-frequency diagnostics of the technical state of longitudinal pipelines by ultrasonic directed waves is described. It is revealed that after correct balancing of all the acoustic antenna piezoelectric transducers, the column image does not appear on the display screen and the mathematical support of the system will automatically collect the technical status of the diagnosed section of the pipeline, the results of which are displayed on the display screen. It is established that the actual area of ​​dry acoustic contact in the "piezoelectric product" system in low-frequency defectoscopy depends on the magnitude of the static force of pressing the surface of the piezoelectric transducer to the surface of the product. It is revealed that the deformation of the micro protrusions of the surface of the product under the action of static clamping force is uneven, which does not allow to fully calculate the actual area of ​​dry contact by mathematical methods. It is shown that in modern systems of low-frequency ultrasonic diagnostics of extended pipelines, directional waves control the quality of dry contact of the surface of the piezoelectric transducer with the surface of the pipe by balancing acoustic antennas with the use of special test programs.

Detection of Defects in Pipes and Elbows Using Guided Waves

2014 ◽  
Author(s):  
Pugen Zhang ◽  
Shaoping Zhou ◽  
Wenchao Lv
Keyword(s):  
Numerical Simulation ◽  
Piezoelectric Transducer ◽  
High Frequency ◽  
Guided Waves ◽  
Signal To Noise Ratio ◽  
Low Frequency ◽  
The Other ◽  
Detection Sensitivity ◽  
Axial Position ◽  
Signal To Noise

This paper deals with the detection of circumferential cracks of different areas in elbow pipes using the guided waves in mode of L(0,2) which are excited by a piezoelectric transducer. The experimental results show that the circumferential cracks can be located in axial position for bend straight side by the reflected echo of defects in the pipes. The detection sensitivity depends on the location of the cracks in bend areas of the pipes. It is easier to detect cracks in the extradose of elbow while harder to detect those in the other locations of the bend. There is a relationship between the detection sensitivity and the frequency of guided waves. The signal-to-noise ratio when detecting the crack before and beyond elbows is highest for the frequency ranges from 120kHz to 130kHz; the crack on the intradose of elbow can be inspected more effectively when using frequencies near 80kHz. Therefore, the combination of high-frequency and low-frequency is used to inspect elbows. The propagation behaviors in elbows are investigated by using numerical simulation. The results of simulation intuitively explain the experimental phenomenon.

Development of a broadband low-frequency mosaic ultrasonic piezoelectric transducer with a limited aperture

2010 ◽  
Vol 46 (9) ◽  
pp. 645-650 ◽  
Author(s):  
V. K. Kachanov ◽  
I. V. Sokolov ◽  
M. M. Konov ◽  
D. V. Timofeev ◽  
A. A. Sinitsyn
Keyword(s):  
Piezoelectric Transducer ◽  
Low Frequency ◽  
Ultrasonic Piezoelectric Transducer

scholarly journals Numerical Study and Optimization of a Novel Piezoelectric Transducer for a Round-Window Stimulating Type Middle-Ear Implant

Micromachines ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 40 ◽  
Author(s):  
Houguang Liu ◽  
Hehe Wang ◽  
Zhushi Rao ◽  
Jianhua Yang ◽  
Shanguo Yang
Keyword(s):  
Middle Ear ◽  
Piezoelectric Transducer ◽  
Numerical Study ◽  
Round Window ◽  
Low Frequency ◽  
Element Model ◽  
Design Parameters ◽  
Middle Ear Implant ◽  
Middle Ear Implants ◽  
Human Ear

Round window (RW) stimulation is a new application of middle ear implants for treating hearing loss, especially for those with middle ear disease. However, most reports on it are based on the use of the floating mass transducer (FMT), which was not originally designed for round window stimulation. The mismatch of the FMT’s diameter and the round window membrane’s diameter and the uncontrollable preload of the transducer, leads to a high variability in its clinical outcomes. Accordingly, a new piezoelectric transducer for the round-window-stimulating-type middle ear implant is proposed in this paper. The transducer consists of a piezoelectric stack, a flextensional amplifier, a coupling rod, a salver, a plate, a titanium housing and a supporting spring. Based on a constructed coupling finite element model of the human ear and the transducer, the influences of the transducer design parameters on its performance were analyzed. The optimal structure of the supporting spring, which determines the transducer’s resonance frequency, was ascertained. The results demonstrate that our designed transducer generates better output than the FMT, especially at low frequency. Besides this, the power consumption of the transducer was significantly decreased compared with a recently reported RW-stimulating piezoelectric transducer.

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