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IEE Proceedings A - Physical Science, Measurement and Instrumentation, Management and Education - Reviews

Issue 4 • Date June 1984

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Displaying Results 1 - 10 of 10
  • Ultrasonics

    Publication Year: 1984
    IEEE is not the copyright holder of this material | PDF file iconPDF (123 KB)
    Freely Available from IEEE
  • Recent developments in SAW devices

    Publication Year: 1984, Page(s):186 - 215
    Cited by:  Papers (17)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (5056 KB)

    Surface-acoustic-wave (SAW) delay lines employing photolithographically fabricated transducers were first described in 1965. Since then there has been a continuous stream of publications on the physics of SAW propagation, and on the applications of these planar acoustic elements as high-frequency electrical components. By 1975 the principles of many potentially useful SAW devices had been describe... View full abstract»

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  • Bulk acoustic microwave delay lines: design, fabrication and performance

    Publication Year: 1984, Page(s):216 - 224
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1371 KB)

    This paper presents a review of the state of the art on bulk acoustic delay lines, the main feature of which is to achieve large delays, up to 100 ¿¿s, in very small size packages. The structure uses piezoelectric thin-film transducers working at microwave frequencies (1 to 10 GHz). Basic design considerations show the range of specifications, mainly bandwidth, insertion loss and delay time, which... View full abstract»

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  • Medical ultrasonics

    Publication Year: 1984, Page(s):225 - 232
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1862 KB)

    The propagation speed of ultrasound in biological soft tissues is about 1500 ms¿11, and the attenuation rate is about 1 dBcm¿1 MHz¿1. Using piezoelectric ceramic transducers, pulse-echo techniques are widely used in diagnosis, particularly with time/position and real-time two-dimensional displays in obstetrical, abdominal and cardiological investigations. Doppler techniques are used for fetal h... View full abstract»

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  • Medical ultrasonic standards at NPL

    Publication Year: 1984, Page(s):233 - 240
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1743 KB)

    Absolute measurement of the acoustic output of medical ultrasonic equipment in the megahertz frequency range is discussed, together with the methods developed at NPL for the determination of the total ultrasonic power using a radiation pressure balance and the measurement of spatial and temporal field quantities with miniature piezoelectric hydrophones. The principles of the radiation pressure bal... View full abstract»

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  • Acoustic emission: its techniques and applications

    Publication Year: 1984, Page(s):241 - 251
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1842 KB)

    Acoustic emission offers the possibility of inspecting the whole volume of large structures from a limited number of access points. The paper discusses the historical development of the technique and describes the instrumentation and analytical methods used for interpretation. Experience has shown that, contrary to early statements, acoustic emission is not a universal inspection tool and the latt... View full abstract»

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  • Review of recent developments in ultrasonic NDT systems in the CEGB

    Publication Year: 1984, Page(s):252 - 264
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1993 KB)

    Ultrasonic NDT is used extensively in the CEGB and, in recent years, demands for its wider application and for higher quality inspections have prompted considerable developments. Traditional ultrasonic inspection equipment can now be complemented by sophisticated analogue and digital devices which take advantage of modern electronics and computer technology. Developments in both data collection an... View full abstract»

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  • Review of some recent advances in quantitative ultrasonic NDT

    Publication Year: 1984, Page(s):265 - 274
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1472 KB)

    Nondestructive testing is moving from being an art to a quantitative science. The paper first reviews the ultrasonic NDT literature; this is followed by consideration of the contribution which can be made to the understanding of analytically intractable wave-defect interaction problems by the use of numerical modelling based on explicit finite-difference schemes. Examples are presented of a develo... View full abstract»

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  • High-voltage spark discharge source as an ultrasonic generator

    Publication Year: 1984, Page(s):275 - 281
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (987 KB)

    A high-voltage spark-discharge source acting as an impulsive ultrasonic generator has been designed and tested. Ultrasound generated by this source has been detected and compared with ultrasound generated by a Q-switched Nd:YAG laser pulse focused to produce a plasma on the surface of the metal sample. The two sources have been shown to exhibit similar ultrasound generation characteristics. Additi... View full abstract»

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  • Acoustic microscopy: present and future

    Publication Year: 1984, Page(s):282 - 291
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1910 KB)

    After nearly ten years of research and development, the acoustic microscope has now reached the point where its resolution is far superior to that of the optical microscope. Several commercial firms are now in the process of manufacturing scanning acoustic microscopes, and it will not be long before these are available on the open market. In the paper, we review the basic operating principles of t... View full abstract»

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