摘要:

The design of an assembly of miniature transducers for wall pressure measurements in turbulent boundary layer flows is described. It is believed that the transducers are the smallest that have been used for the detection of turbulent pressure fluctuations. Calibration of the transducers indicated a sensitivity of −130 dBreIV/μbar and a uniform frequency response from 10 cps to 20 Kc/Sec.

ISSN:0001-4966    

DOI:10.1121/1.1910055

出版商:Acoustical Society of America    

年代:1966

数据来源: AIP

摘要:

Extending previously reported work [B. G. Hurdle, R. H. Ferris, and K. D. Flowers, “Effect of Transducer Velocity on the Structure of Signals Scattered from the Ocean Bottom,” J. Acoust. Soc. Am.36, 1936–1942 (1964)], a method for describing the fine structure of acoustic fields scattered from the ocean bottom is presented. The fluctuating characteristic of scattered signals is shown to be the result of intercepting the lobes of the interference field when the source and or receiver are in motion. Lobe or interference widths computed from measured data are independent of speed and in good agreement with a simple physical model. Lobe widths also appear to be independent of bottom roughness. A similarity exists between acoustical scattering and optical scattering employing a monochromatic (laser) source.

ISSN:0001-4966    

DOI:10.1121/1.1910056

出版商:Acoustical Society of America    

年代:1966

数据来源: AIP

摘要:

Several points in a paper by McDaniel [J. Acoust. Soc. Am.38, 644–647 (1966)] on finite‐amplitude ultrasonic waves in water, have been questioned, and connections have been pointed out.

ISSN:0001-4966    

DOI:10.1121/1.1910057

出版商:Acoustical Society of America    

年代:1966

数据来源: AIP