Xem 1-7 trên 7 kết quả Ultrasonic signals
  • The idea of using ultrasonic waves in medical and engineering fields came from military applications of sound waves in sonar systems. Sokolov, Firestone, Simons, and several other researchers are among the ones who studied this high frequency kind of wave in the first half of twentieth century. Ultrasonic waves are defined as those with frequencies higher than 20 kHz. The constant development of data acquisition systems and probes seems to work, removing the upper limit of the wave frequency that can be acquired.

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  • Today, the ultrasonic signal is being used for predicting material behavior, characterizing (detecting internal anomalies in) a variety of engineering structures, as well as for inspecting human body parts like tumors, bones, and unborn fetuses. Because of the ever-increasing popularity of the ultrasonic techniques in a wide range of applications, this technology has received a lot of attention from the research community. This book presents some new developments in ultrasonic research for material and structure inspection. Application areas cover both engineering and biological materials....

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  • It is remarkable that the pathological state of human soft tissues highly correlates with static and low-frequency mechanical properties, particularly shear elasticity (e.g., Sumi, 2005d). Accordingly, we have been developing ultrasonic (US)-strain measurement-based one- dimensional (1D) (Sumi et al., 1993, 1995a, 2010f; Sumi, 1999b, 2005d, 2008a, 2010d; Sumi & Matsuzawa, 2007b), 2D (Sumi et al., 1993, 1995a; Sumi, 1999c, 2005d, 2006b, 2007g, 2008a, 2008c, 2010d) and 3D (Sumi, 1999c, 2005d, 2006b, 2007g, 2010d.

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  • In this Unit, the operation of each block on Main Unit will be introduced. After study complete, users are able to use KL-62001 as measurement and assist tool for KL-620 experiments. Discussion: When connecting CHIP to the GND, the analog signal received from A/D Converter will send to single chip for decoding and output to 7 segment display? When sending the analog signal to the PC, the signal should be converted to digital format. As the result, this technique will be used when connecting the main unit to the PC. Check next exercise?...

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  • EURASIP Journal on Applied Signal Processing 2003:5, 470–478 c 2003 Hindawi Publishing Corporation Speckle Suppression in Ultrasonic Images Based on Undecimated Wavelets Fabrizio Argenti Dipartimento di Elettronica e Telecomunicazioni, Universit` di Firenze, Via di Santa Marta 3, 50139 Firenze, Italy a Email: argenti@lenst.det.unifi.it Gionatan Torricelli Dipartimento di Elettronica e Telecomunicazioni, Universit` di Firenze, Via di Santa Marta, 3, 50139 Firenze, Italy a Email: torricelli@det.unifi.

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  • The distance between the vehicle and an obstacle is measured by way of ultrasonic signals and audibly signalled by a warning tone. This tone sequence changes continuously corresponding to the distance between vehicle and obstacle, indicating to the driver the distance to the obstacle. The shorter the distance of the vehicle from the obstacle the faster the tone sequence. A continuous tone sounds at a distance of less than 25 cm. To distinguish the sounds, the pitch is different at the front and rear.

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  • The quality of phased array and synthetic aperture ultrasonic images is limited by several factors determined by the sound propagation physics and diffraction laws. Image quality is mainly determined by: Resolution, which depends on signal bandwidth (in the axial direction) and on the aperture extent (in the lateral direction); Dynamic range, which is bounded by the ratio of the main to the sidelobes level and is related to the smallest features detection capability.

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