scholarly journals Numerical Investigation of Surface Acoustic Wave (SAW) Interacting with a Droplet for Point-of-Care Devices

2019 ◽  
Vol 24 (4) ◽  
pp. 632-637 ◽  
Author(s):  
Imran Shah ◽  
Emad Uddin ◽  
Aamir Mubashar ◽  
Muhammad Yamin Younis ◽  
Hudair Samad ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Lead Zirconate Titanate ◽  
Point Of Care ◽  
Input Voltage ◽  
Lead Zirconate ◽  
Lateral Position ◽  
Lateral Direction ◽  
Spherical Droplet

A three-dimensional numerical simulation of the interaction of a surface acoustic wave (SAW) with a droplet of water is carried out. The mixing produced inside the droplet due to the incident with the SAW and the droplet is investigated by undertaking a parametric study, with parameters such as frequency, drop size, and the lateral position of the droplet on the surface of the substrate. The linear relationship between the input voltage and the mixing velocity inside the droplet is obtained with variation of the input voltage of the inter-digital transducer (IDT) of the SAW device within a 10--40 V range. With the variation in frequency, the maximum mixing velocity is observed at 20 MHz and it appears to be independent of the size of the droplet. Varying the substrate material with lead zirconate titanate and lithium niobate produces better mixing. Lithium niobate is preferred due to its availability and cost-effectiveness. A drop of 600 um diameter produces better mixing. The different velocities inside the drop and the SAW device are obtained by changing the droplet position in the lateral direction (asymmetrical position) from the centre of the substrate. Cut planes parallel and perpendicular to the SAW at the core of a half-spherical droplet are observed to visualise the mixing effects inside the droplet during the interaction. To achieve the best mixing criteria, the droplet is moved in a lateral direction. An efficient parametric design for the mixing phenomena in micro-fluidic devices is presented for point-of-care devices.

Characterization of lead zirconate titanate ceramics using surface acoustic wave

Ultrasonics ◽  
1986 ◽  
Vol 24 (3) ◽  
pp. 133-136 ◽  
Author(s):  
C.K. Jen ◽  
P. Cielo ◽  
X. Maldague ◽  
E.L. Adler ◽  
G. Shapiro
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Lead Zirconate Titanate ◽  
Lead Zirconate ◽  
Zirconate Titanate ◽  
Titanate Ceramics

scholarly journals Surface Acoustic Wave-Based Flexible Piezocomposite Strain Sensor

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1576
Author(s):  
Rishikesh Srinivasaraghavan Govindarajan ◽  
Eduardo Rojas-Nastrucci ◽  
Daewon Kim
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Lead Zirconate Titanate ◽  
Polyvinylidene Fluoride ◽  
Strain Sensor ◽  
Fast Response ◽  
Lead Zirconate ◽  
Saw Sensor ◽  
Sensing Applications ◽  
Wide Range

A surface acoustic wave (SAW), device composed of polymer and ceramic fillers, exhibiting high piezoelectricity and flexibility, has a wide range of sensing applications in the aerospace field. The demand for flexible SAW sensors has been gradually increasing due to their small size, wireless capability, low fabrication cost, and fast response time. This paper discusses the structural, thermal, and electrical properties of the developed sensor, based on different micro- and nano-fillers, such as lead zirconate titanate (PZT), calcium copper titanate (CCTO), and carbon nanotubes (CNTs), along with polyvinylidene fluoride (PVDF) as a polymer matrix. The piezocomposite substrate of the SAW sensor is fabricated using a hot press, while interdigital transducers (IDTs) are deposited through 3D printing. The piezoelectric properties are also enhanced using a non-contact corona poling technique under a high electric field to align the dipoles. Results show that the developed passive strain sensor can measure mechanical strains by examining the frequency shifts of the detected wave signals.

scholarly journals Connected Lead Zirconate Titanate Nanodot Arrays for Perspective Functional Materials

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
M. Waegner ◽  
A. Finn ◽  
G. Suchaneck ◽  
G. Gerlach ◽  
L. M. Eng
Keyword(s):  
Lead Zirconate Titanate ◽  
Short Circuit ◽  
Functional Materials ◽  
Piezoresponse Force Microscopy ◽  
Lead Zirconate ◽  
Lateral Direction ◽  
Flexible Polymer ◽  
Zirconate Titanate ◽  
Out Of Plane ◽  
The Matrix

We describe the fabrication of lead zirconate titanate (PZT) nanodisc arrays isolated by a polymer layer and contacted with a top electrode. PZT thin films were deposited by multitarget sputtering onto a platinum/titanium bottom electrode and structured by means of nanosphere lithography. To guarantee short-circuit-free deposition of a top electrode, the space between the nanostructures was filled by a polymer. Two approaches for the filling are demonstrated: (a) imprinting and (b) skim coating. Single nanodiscs embedded in a flexible polymer matrix have two major advantages. First, taking into account the flexibility of the matrix, they can vibrate in lateral direction and, second, due to shrinking to the nanoscale, predominant directions of the polarization form, such as vortex- or bubble-like domain patterns. Piezoresponse force microscopy was performed on patterned and nonpatterned samples with and without a top electrode to check the local piezoresponse. Comparison of the different samples revealed an increase in lateral piezoactivity for patterned samples with Ni/Cr electrode while the out-of-plane piezoresponse remained constant. Gold electrodes limit the piezoresponse in both measured directions.

Linear and Nonlinear Analysis of Additively Manufactured Material With Different Porosity Induced by Varying Material Printing Speed Using Guided Acoustic Waves

2021 ◽  
Author(s):  
SeHyuk Park ◽  
Hamad Alnuaimi ◽  
Anna Hayes ◽  
Madison Sitkiewicz ◽  
Umar Amjad ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Nonlinear Analysis ◽  
Lead Zirconate Titanate ◽  
Acoustic Waves ◽  
Scanning Speed ◽  
Lead Zirconate ◽  
Nonlinear Ultrasonic ◽  
Scan Speed ◽  
Linear And Nonlinear ◽  
Characterization Of Materials

Abstract Guided acoustic wave based techniques have been found to be very effective for damage detection, and both quantitative and qualitative characterization of materials. In this research, guided acoustic wave techniques are used for porosity evaluation of additively manufactured materials. A metal 3D printer, Concept Laser Mlab 200 R Cusing™, is used to manufacture 316L additively manufactured (AM) stainless steel specimens. Two levels of porosity are investigated in this study, which was controlled by a suitable combination of scan speed and laser power. The sample with lower level of porosity is obtained with a low scanning speed. Lead Zirconate Titanate (PZT) transducers are used to generate guided acoustic waves. The signal is excited and propagated through the specimens in a single sided transmission mode setup. Signal processing of the recorded signals for damage analysis involves both linear and nonlinear analyses. Linear ultrasonic parameters such as the time-of-flight and magnitude of the propagating waves are recorded. The nonlinear ultrasonic parameter, the Sideband Peak Count Index (SPC-I) is obtained by a newly developed nonlinear analysis technique. Results obtained for both specimens are analyzed and compared using both linear and nonlinear ultrasonic techniques. Finally, the effectiveness of SPC-I technique in monitoring porosity levels in AM specimens is discussed.

Direct-laser metal writing of surface acoustic wave transducers for integrated-optic spatial light modulators in lithium niobate

2017 ◽  
Author(s):  
Bianca C. Datta ◽  
Nickolaos Savidis ◽  
Michael Moebius ◽  
Sundeep Jolly ◽  
Eric Mazur ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Spatial Light Modulators ◽  
Light Modulators ◽  
Direct Laser
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