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Gas jets as ultrasonic waveguides
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UNSPECIFIED (2003) Gas jets as ultrasonic waveguides. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 114 (3). pp. 1254-1265. doi:10.1121/1.1596169 ISSN 0001-4966.
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Official URL: http://dx.doi.org/10.1121/1.1596169
Abstract
The study of the propagation of ultrasound within a gas jet is extended to obtain waveguide effects, where the jet collimates the ultrasonic beam from a transducer within the flow. Two methods have been investigated to achieve this-cooling the gas within the air jet, and using a different gas whose acoustic velocity is lower than air. Cooling an air jet to a temperature less than that of the surrounding air produced a noticeable waveguide effect. In addition, studies have been carried out using other selected gases, such as carbon dioxide (CO2) with a lower acoustic velocity than air, and helium (He) with a higher value. The former gas enhanced confinement of the ultrasonic beam, whereas the latter caused divergence. An ideal solution was found to be a CO2 /air mixture, which produced a well-collimated sound field along the axis, while limiting the excess attenuation of pure CO2 gas jets. The effectiveness of the waveguide using mixed gas jets in producing images in air-coupled testing of solids is demonstrated. (C) 2003 Acoustical Society of America.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||
Journal or Publication Title: | JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | ||||
Publisher: | ACOUSTICAL SOC AMER AMER INST PHYSICS | ||||
ISSN: | 0001-4966 | ||||
Official Date: | September 2003 | ||||
Dates: |
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Volume: | 114 | ||||
Number: | 3 | ||||
Number of Pages: | 12 | ||||
Page Range: | pp. 1254-1265 | ||||
DOI: | 10.1121/1.1596169 | ||||
Publication Status: | Published |
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