Design of high-intensity ultrasonic sound intensity measurement based on narrow pulse method
The research on high-intensity ultrasonic has taken the delectable achievement in the treatment of cancer and the detection of internal structure for the dam. The rapid and accurate sound intensity measurement of high-intensity ultrasonic transducer is necessary for its application and generalization. The paper introduces the principle of sound intensity measurement, proposes measurement scheme on the basis of the narrow pulse method and also discusses the design of hardware circuit and software.
Five years rapid development of the high intensity focused ultrasound technique
Five years have passed since the First International Symposium on High Intensity Foc-used Ultrasound Application in Medicine held in Chongqing,China,and the founding of the In-ternational Society of Therapeutic Ultrasound in 2001.HIFU has undergone rapid development over the past five years.This article describes main differences between the HIFU surgery and the traditional ultrasound thermo-therapy,introduces the progresses made in HIFU techniques,the basics of ultrasound bio-physics,clinic applications of HIFU,as well as the international academic acti-vities in HIFU.In particular,contributions made by Chinese scholars are introduced,and the future challenges faced discussed.
Measurements in liquids at medium and high ultrasonic intensities
Abstract With the expansion of ultrasonic techniques into industry there is continuing demand for more detailed information on the performance and rating of ultrasonic equipment. It is also desirable that any performance data quoted by manufacturers should be obtained by agreed standard methods. This paper analyses the problem of measurement and standardization in the difficult field of liquid processing, which includes ultrasonic cleaning. The author is chairman of the sub-committee set up to deal with these problems by the British Scientific Instrument Manufacturers' Association