Bessel beam ultrasonic transducer: Fabrication method and experimental results

1989 ◽  
Vol 55 (20) ◽  
pp. 2066-2068 ◽  
Author(s):  
D. K. Hsu ◽  
F. J. Margetan ◽  
D. O. Thompson
Keyword(s):  
Ultrasonic Transducer ◽  
Bessel Beam ◽  
Experimental Results ◽  
Fabrication Method

Refrigerative Stereolithography Using Sol-Gel Transformable Photopolymer Resin and Direct Masking

2000 ◽  
Vol 625 ◽  
Author(s):  
T. Murakami ◽  
A. Kamimura ◽  
N. Nakajima
Keyword(s):  
Liquid Layer ◽  
Light Exposure ◽  
Sol Gel ◽  
Experimental Results ◽  
Fabrication Method ◽  
Resin Layer ◽  
Direct Light ◽  
Section Shape

AbstractThe authors have been studying a new fabrication method termed “refrigerative stereolithography” which uses a gel resin layer instead of a liquid layer as in conventional stereolithography. This paper proposes the “direct masking method” in which a masking pattern is drawn to block direct light exposure to the surface of the gel resin layer. With such masks, we can avoid surplus growth only in the regions where it is unnecessary to improve height direction accuracy and resolution. Also, we can solidify the required section shape selectively using the masks and a lamp instead of laser scan patterns. The effectiveness of refrigerative stereolithography with the direct masking method is discussed and confirmed by some experimental results.

Non-uniformly polarized piezoelectric modal transducer: fabrication method and experimental results

2006 ◽  
Vol 15 (4) ◽  
pp. 904-908 ◽  
Author(s):  
H Calás ◽  
E Moreno ◽  
J A Eiras ◽  
A Aulet ◽  
J Figueredo ◽  
...  
Keyword(s):  
Experimental Results ◽  
Fabrication Method

Novel Bulk Acoustic Wave Hammer to Determinate the Dynamic Response of Microstructures Using Pulsed Broad Bandwidth Ultrasonic Transducers

2001 ◽  
Author(s):  
Wen-Pin Lai ◽  
Yi-Ping Ho ◽  
Weileun Fang
Keyword(s):  
Acoustic Wave ◽  
Dynamic Response ◽  
Ultrasonic Transducer ◽  
Test Sample ◽  
Wide Frequency Range ◽  
Experimental Results ◽  
Bulk Acoustic Wave ◽  
Test Apparatus ◽  
Acoustic Coupling ◽  
Modal Damping

Abstract A novel testing technique to determinate the dynamic response of the microstructure is presented. In this study, a bulk acoustic wave hammer generated by a pulsed ultrasonic transducer is used to excite the microstructures. Thus the dynamic response of the microstructure in a wide frequency range is excited. Based on this novel method and test apparatus, the dynamic response of the microstructure including the resonant frequency, mode shape and the modal damping of the microstructure can be measured in a single excitation. Experimental results of the microbeams with different length agree well with theoretical predictions. In summary, the proposed BAW hammer technique has the following advantages. The sample preparation for this approach is very easy since it is not necessary to deposit an additional film for thermal or electrical purpose. In this regard, the experimental results of this technique are more accurate since there is no additional film to influence the dynamic behavior of the test sample. Moreover, there is no uncertain side effect such as thermal and acoustic coupling, caused by this approach. Since the test apparatus is also very simple, this approach has the potential to do the on-line test for batch production.

Detection Resolution Analysis of Scanning Acoustic Microscopy Used in Electronic Packaging

2014 ◽  
Vol 536-537 ◽  
pp. 272-275
Author(s):  
Xiang Hui Guo ◽  
Chun Guang Xu ◽  
Liu Yang ◽  
Kai Peng
Keyword(s):  
Electronic Packaging ◽  
Ultrasonic Transducer ◽  
Experimental Results ◽  
Acoustic Microscopy ◽  
Center Frequency ◽  
Detection Accuracy ◽  
Scanning Acoustic Microscopy ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

Scanning Acoustic Microscopy (SAM) has been a powerful non-destructive testing tool used in electronic packaging and material characterization. With the development of 3D electronic packaging, internal dimensions of electronic packaging are getting more and more smaller, and the detection accuracy of existing non-destructive testing technology is far behind the requirements of manufacturing technology. In this study, a set of practical SAM system was developed independently by our Lab. And its detection resolution was analyzed using high frequency focused transducers with center frequency ranging from 20 MHz to 100MHz. The experimental results show that the lateral resolution of the ultrasonic transducer with 100MHz central frequency can reach about 40 microns, which is consistent with calculated resolution. Comparing with Sparrow criteria, Rayleigh criteria is more coherent with the experimental results.

Design of Well Diameter Mapping System Based on Underwater Acoustic Transducer

2014 ◽  
Vol 926-930 ◽  
pp. 1306-1309
Author(s):  
Si Gai Zhang ◽  
Dian Hong Wang ◽  
Xing Feng Guo
Keyword(s):  
Ultrasonic Transducer ◽  
Experimental Results ◽  
3D Graphics ◽  
Underwater Acoustic ◽  
Acoustic Transducer ◽  
Mapping System ◽  
2D And 3D ◽  
Receiving Module

The well diameter mapping system is based on underwater acoustic ultrasonic transducer, which can draw the 2D and 3D graphics of the well in time. This system includes three parts, the downhole measurement module, receiving module and PC analysis mapping module. Firstly, we use STM32F103 and RS485 to collect and transmit data respectively, then the PC software is used to draw the 2D and 3D graphics of the well diameter. Finally, we complete the evaluation of the downhole conditions based on these graphics and data. The system is mainly used for calculating volume of underground stilts and evaluating the shaft stability and final experimental results show that the system has a good performance in well diameter mapping.

Effect of Inter-Rod Coupling on 1-3 Piezocomposite High-Power Ultrasonic Transducers

2012 ◽  
Vol 476-478 ◽  
pp. 2105-2108 ◽  
Author(s):  
Yu Li Lin ◽  
Gin Shin Chen ◽  
Hsin Chih Liu ◽  
Yu Cheng Lin
Keyword(s):  
High Power ◽  
Volume Fraction ◽  
Epoxy Composite ◽  
Ultrasonic Transducer ◽  
Geometric Parameters ◽  
Experimental Results ◽  
Ultrasonic Transducers ◽  
Composite Matrix ◽  
Volume Fractions ◽  
Power Ultrasonic

Efficiency is a critical performance for a high-power ultrasonic transducer composed of 1-3 piezocomposites and geometric parameters of the composites can influence the efficiency of the transducer. The effect of inter-rod responses in the composite matrix on the efficiency was experimentally investigated in this study. For analyses, four PZT4-epoxy composite ultrasonic transducers with various volume fractions and inter-rod spacing were fabricated in-house. The experimental results demonstrated that the inter-rod coupling of the 0.1-mm spacing could significantly degrade the efficiency of the composite probe at about 1.0 MHz resonance since the 0.1-mm spacing between PZT4 rods was so small as to cause a high interference. At the same volume fraction, the transducer engineer should take the inter-rod coupling into account for the design of the high-power ultrasonic transducer.

scholarly journals A Multi-Curvature, Variable Stiffness Soft Gripper for Enhanced Grasping Operations

Actuators ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 316
Author(s):  
Eun Jeong Song ◽  
Jung Soo Lee ◽  
Hyungpil Moon ◽  
Hyouk Ryeol Choi ◽  
Ja Choon Koo
Keyword(s):  
Degrees Of Freedom ◽  
Analytical Modeling ◽  
Variable Stiffness ◽  
Experimental Results ◽  
Analytic Model ◽  
Fabrication Method ◽  
Fem Simulations ◽  
Industrial Environments ◽  
The Stability ◽  
Stiffness Loss

For soft grippers to be applied in atypical industrial environments, they must conform to an object’s exterior shape and momentarily change their stiffness. However, many of the existing grippers have limitations with respect to these functions: they grasp an object with only a single curvature and a fixed stiffness. Consequently, those constraints limit the stability of grasping and the applications. This paper introduces a new multicurvature, variable-stiffness soft gripper. Inspired by the human phalanx and combining the phalanx structure and particle jamming, this work guarantees the required grasping functions. Unlike the existing soft pneumatic grippers with one curvature and one stiffness, this work tries to divide the pressurized actuating region into three parts to generate multiple curvatures for a gripper finger, enabling the gripper to increase its degrees of freedom. Furthermore, to prevent stiffness loss at an unpressurized segment, this work combines divided actuation and the variable-stiffness capability, which guarantee successful grasping actions. In summary, this gripper generates multiple grasping curvatures with the proper stiffness, enhancing its dexterity. This work introduces the new soft gripper’s design, analytical modeling, and fabrication method and verifies the analytic model by comparing it with FEM simulations and experimental results.

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