Lawrence C Lynnworth

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A bundle of acoustically slender metal rods, each thin compared to wavelength, tightly packed within a sheath, and welded closed at each end, provides a dispersion-free waveguide assembly that acts as a thermal buffer between a transducer and the hot fluid medium the flow of which is to be measured. Gas and steam flow applications have ranged up to 600(More)
The following applications are reviewed: ultrasonic measurement of flow, temperature, density, porosity, pressure, viscosity and other transport properties, level, position, phase, thickness, composition, anisotropy and t exture, grain size, stress and strain, elastic properties, bubble, particle and leak detection, nondestructive testing, acoustic(More)
A solid corrosion-resistant torsional waveguide of diamond cross section has been developed to sense, online and in real-time, the characteristics of the liquid in which it is submerged. The sensor can measure, among other things, the liquid content of a bubbly medium, the density of adjacent pure liquids, the equivalent density of liquid-vapor mixtures or(More)
Milk contaminated with melamine resulted in an important health hazard that affected many babies in China recently. Ultrasonic characterization of adulterated milk may detect gross levels of melamine contamination. Sound speed and density measurements were made in skim milk as a function of melamine adulteration. An ultrasonic measurement technique to(More)
Wetted ultrasonic transit time flow meters typically consist of one or more pairs of transducers, containing piezoelectric elements, which alternate between transmitting and detecting an ultrasonic pulse. Typical piezoelectric materials and the adhesives used to attach the piezoelectric element in such devices can be damaged by hostile environments, such as(More)
pattern rapidly grew towards the applicator forming a filled V shapein 15 s at 95 W/each applied. The system and applicators were tested in 3 anesthetized juvenile pigs. Liver incisions with varying lengths (3.5 ± 1.3 cm) and depths (0.42 ± 0.3 cm) were treated. Two approaches were used: (A) applicators were oriented so they straddled the incision (one on(More)
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