Ultrasonic tomographic imaging of temperature and flow fields in gases using air-coupled capacitance transducers

作     者：Wright, WMD Schindel, DW Hutchins, DA Carpenter, PW Jansen, DP 

作者机构：Univ Warwick Dept Engn Coventry CV4 7AL W Midlands England NRC Inst Aerosp Res Ottawa ON K1A 0R6 Canada Ontario Hydro Technol Toronto ON M8Z 5S4 Canada 

出 版 物：《JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA》 (J. Acoust. Soc. Am.)

年 卷 期：1998年第104卷第6期

页      面：3446-3455页

核心收录：

学科分类：1002[医学-临床医学] 07[理学] 082403[工学-水声工程] 08[工学] 070206[理学-声学] 0824[工学-船舶与海洋工程] 0702[理学-物理学] 

主　　题：air temperature Tomography Temperature fields Projection algorithms flow field Ultrasonic attenuation air coupling Heat sources Temperature Gases region of an image Capacitive transducers measuring instruments Ultrasonic Tomography 

摘      要：A pair of air-coupled ultrasonic capacitance transducers with polished metal backplates have been used to image temperature and Bow fields in gases using ultrasonic tomography. Using a filtered back-projection algorithm and a difference technique, cross-sectional images of spatially variant changes in ultrasonic attenuation and slowness caused by the presence of temperature and Bow fields were reconstructed. Temperature fields were produced in air by a commercial soldering iron, and the subsequent images of slowness variations used to reconstruct the air temperature at various heights above the iron. When compared to measurements made with a thermocouple, the tomographically reconstructed temperatures were found to be accurate to within 5%. The technique was also able to resolve multiple heat sources within the scan area. Attenuation and Velocity images were likewise produced for flow fields created by an air-jet from a l-mm-diam nozzle, at both 90 and 45 degrees to the scanning plane. The fact that temperature and flow fields can be measured in a gas without the need to insert any measuring devices into the image region is an advantage that may have many useful applications. (C) 1998 Acoustical Society of America. [S0001-4966(98)00412-3].