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Surface Acoustic Wave (SAW) Sensors: Physics, Materials, and Applications
Surface acoustic waves (SAWs) are the guided waves that propagate along the top surface of a material with wave vectors orthogonal to the normal direction to the surface. Based on these waves, SAW sensors are conceptualized by employing piezoelectric crystals where the guided elastodynamic waves are generated through an electromechanical coupling. Electromechanical coupling in both active and passive modes is achieved by integrating interdigitated electrode transducers (IDT) with the piezoelectric crystals. Innovative meta-designs of the periodic IDTs define the functionality and application of SAW sensors. This review article presents the physics of guided surface acoustic waves and the piezoelectric materials used for designing SAW sensors. Then, how the piezoelectric materials and cuts could alter the functionality of the sensors is explained. The article summarizes a few key configurations of the electrodes and respective guidelines for generating different guided wave patterns such that new applications can be foreseen. Finally, the article explores the applications of SAW sensors and their progress in the fields of biomedical, microfluidics, chemical, and mechano-biological applications along with their crucial roles and potential plans for improvements in the long-term future in the field of science and technology.
Journal Article
Sammy Saw
Sammy Saw is nervous about making the scenery for the school play, but thankfully the tool team is ready to help him!
Book
One-Man Folding Cross-Cut Saw
A saw, like the one I brought to the EAIA 2023 annual meeting in Staunton, Virginia, was patented in 1882 by Marvin Smith (Figures 2, 3, and 4). The drag saw that I brought to the annual meeting was on a one-week loan from Steppingstone Farm Museum in Havre de Grace, Maryland. The Steppingstone Farm Museum acquired it in 1995.
Journal Article
Chainsaw man
Denji's a poor young man who'll do anything for money, even hunting down devils with his pet devil-dog Pochita. He's a simple man with simple dreams, drowning under a mountain of debt. But his sad life gets turned upside down one day when he's betrayed by someone he trusts. Now with the power of a devil inside him, Denji's become a whole new man--Chainsaw Man! -- From volume 1.
BOOK
Rock Breakage and Tools Performance During Rock Processing by Multidiameter Combination Saw with Different Diameters
To better understand the rock breakage mechanism and optimize tool performance during rock machining by multidiameter combination saw, the rock processing experiment using a multidiameter combination saw was carried out on the bridge saw to investigate the variation of load with diameter in the combination saw. Furthermore, in this study, the sawing forces, tools wear, and rock breakage in the processing rock were qualitatively analyzed and compared. The experimental investigations demonstrated that the maximum undeformed chip thickness, the load per diamond, and the load in the sawing arc zone all decrease with increasing diameters of the single saw in the combination saw. The sum of the vertical forces of the single saw is generally less than that of the combination saw under the same parameters because of the existence of the coupling effect between the single saws. Different failure mechanisms of particles in the worn segment of the tool with different diameters also operate in rock processing using a multidiameter combination saw. With increasing diameter of saw blade, the proportion of the whole and blunt diamond particles increases, and that of the macro-fractured and pulled-out crystals decreases. Moreover, the differences in the surface integrity are attributed to the variation in the maximum undeformed chip thickness on the saw blade with different diameters in the combination saw and the gully depth on the surface, and the surface roughness of rock decreases with increasing diameter of the single saw. HighlightsThe experiments for rock processing by a multidiameter combination saw are designed to investigate the sawing performance of multidiameter combination circular saw with different diameters.Different failure mechanisms of particles in the worn segment of the tool with different diameters operate in rock processing using a multidiameter combination saw.The differences in the surface integrity are attributed to the variation in the maximum undeformed chip thickness on the saw blade with different diameters in the combination saw.Coupling effect between the single saws affects decomposition and generation of forces in the multidiameter saw.
Journal Article
A Comparative Study of Divergent Surface Acoustic Wave Beams’ Generation on an Y128° Lithium Niobate Using Various Types of Interdigital Transducers
This study focuses on the possibility of generating divergent surface acoustic waves (SAWs) with interdigital transducers (IDTs) deposited on Y128° Lithium Niobate for non-destructive testing applications, particularly in the context of manufacturing layer-on-substrate systems for microelectronic components. The selected approach is to diffuse the SAWs over a large surface area and in various directions in order to analyze the structure and detect any defects when using the well-known passive imaging by correlating the diffuse acoustic field. The introduction of SAWs is achieved using offset interdigital transducers that make acoustic contact with the sample under analysis without causing damage. The considered IDTs are characterized based on criteria for maximizing the divergence angle, maximizing SAW emission amplitude, and minimizing the acoustic contact area. Three IDT configurations were tested to compare their performance: (i) a transducer with circular electrodes emitting from its wide convex end; (ii) a circular IDT emitting from its narrow concave end; and (ii) a narrow transducer with an aperture close to two wavelengths. It was shown that the second configuration provides the highest SAW amplitude, which is important while measuring the diffuse acoustic field. Nevertheless, the third one was particularly efficient in terms of reducing the contact area.
Journal Article
Why not use thin kerf blades on gang rip saws?
Years ago, blades, both circle and band, were created with this slight bend by pounding the center sections with a hammer to dish the blade. Sometimes we believe that a little bend or residual stress lengthwise in a piece of wood can be fixed by bending it straight in gluing and then gluing to another straight piece so that overall the two pieces should be straight. [...]the first cut saw can be a little thicker than the other size as it is working in waste wood, so its thickhess means straighter cuts. + Gene Wengert (19422025) was popularly known as \"The Wood Doctor.\"
Trade Publication Article