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Nuclear ultrasonic fast passage
ABSTRACTS Copies of original articles are best obtained by writing direct to the journal in which they appeaged. The addresses of journals can be found in a reference book such as )World
List of Scientific and Technical Publications’, )Willings Press Guide’, ‘Newspaper Press Directory’ and for American journals only, ‘Ayers’.
ABRAHAMS , C . J.
CRISLER, D. F. Relative ultrasonic amplification in vapour-phase grown zinc oxide crystals. Proceedings of the Institute of Electrical and Electronics Engineers,Vol 55, No 12 (December 1967) ~~2181-2182 The construction, operation and relative gain of an ultrasonic amplifier using a vapour-phase grown zinc oxide crystal as the amplifying medium are described. The mode of operation was compressional. The desired operational resistivity (- lo* ohm. cm) was obtained at 173% Maximum relative gain was about 52dB/cm. (Ultrasonics 1968, abstract 755)
Methods used in ultrasonic testing of welds. Welding and Metal Fabrication,Vol 35,No 11 (November 1967) pp458463 A detailed account of the procedures adopted for the ultrasonic examination of different types of welds is presented and the implications of the method in quality control are considered. (Ultrasonics 1968,abstract 749)
AVERBUCH,P., JAMES, L. W. and MAHLER, R. J. Nuclear ultrasonic fast passage. Applied Physics Letters, Vol ll,No 11 (December 1967) pp339-340 An ultrasonic fast passage experiment is described; the small resulting nuclear spin inversion (16%) is explained by inability to obtain ideal experimental conditions. (Ultrasonics 1968, abstract 750)
CHARPENTIER, J. and SINCLAIR,R. Ultrasonic pickling of copper-base materials. Journal of the Institute of Metals,Vol 96 (January 1968) p2439 A short series of tests has shown that the application of ultrasonic vibrations can increase, by factors between 1 and 15, the pickling rates in dilute sulphuric acid of several oxidized copper-base materials. Possible industrial applications are suggested and the economies of ultrasonic pickling are discussed briefly. (Ultrasonics 1968, abstract 751)
CONNOLLY, C. An ultrasonic generator giving widely variable ultrasonic parameters. Biomedical Engineering,Vol 3,No 2 (February 1968) ~~72-75 A detailed description is given of the construction of a generator of ultrasound whose parameters lie in the range between those used in diagnostic ultrasound and those used in surgery. The high intensities obtainable are of particular interest. (Ultrasonics 1968, abstract 752)
COSGROVE, D. G. Determining the linearity of an ultrasonic unit. Materials Evaluation,Vol 25,No 11 (November 1967) on259-263 This paper discloses’s new electronic means,-iyn-0-Chek, for accurate determination of the linearity of an ultrasonic unit. It presents the Lyn-0-Chek as both a maintenance tool and a quality control standard. The theory and use of this unit are described and compared with methods proposed by the American Society for Testing Materials in E127-61T and the Tentative Recommended Practice for Evaluating Performance Characteristics of a pulse-echo ultrasonic testing system as submitted to the committee E-7 Sub VI, Section I. (Ultrasonic 1968, abstract 753)
CRAWFORD,A. E. Ultrasonic generator using thyristors. Electronic Engineering, Vol 40, No 480 (February 1968) p66 An ultrasonic generator based on a thyristor circuit is described for application to ultrasonic cleaning systems. Details of design and practical construction are also given. (Ultrasonics 1968, abstract 754)
DE STERKE, A. Some aspects of radiography and ultrasonic testing of welds in steel with thicknesses from lOO-3OOmm. British Journal of Non-Destructive Testing, Vol 9, No 4 (December 1967) pp94-107 With increasing steel thickness problems are introduced not only in forming and welding but also in non-destructive examination. Non-destructive testing in heavy industry conjures up images of ultrasonic testing of big forgings or radiography of heavy castings. Radiography of forgings is seldom undertaken because the presence of cavities is very rare. During forging possible discontinuities in the original ingot are flattened and become difficult to reveal radiographically. However, ultrasonic testing is not such an obvious technique to discover flaws because cavities in castings are often irregular in shape. In general, they tend to scatter sound instead of producing clear signals. Structure as well as shape and surface condition are of appreciable influence. Here radiography offers advantages, providing ultrahard radiation is used for thick sections, in particular when a variety of thicknesses require a great latitute of the radiograph. (Ultrasonics 1968, abstract 756) FRASER, D. B., KRAUSE, J. T. and MEITZLER,A. H. Physical limitations on the performance of vitreous silica in high frequency ultrasonic and acousto-optical devices. Applied Physics Letters,Vol ll,No 10 (November 1967) pp308 -310 The usefulness of vitreous silica in a variety of high-frequency ultrasonic and acousto-optical devices is often limited by the acoustic properties of the material. This paper reports recent findings on (1) the acoustic loss-frequency dependence for shear waves in vitreous silica and (2) the magnitude of the fluctuation in the shear wave phase velocity. Information on shear wave propagation characteristics is most important for ultrasonic delay line applications for which the shear mode of propagation is predominantly used. (Ultrasonics 1968, abstract 757) FRIELINGHAUS, R. and SCHLENGERMANN, U. On the determination of nedr-field length of angle probes for ultrasonic materials testing. Materialpriifung, Vol 9, No 12 (December 1967) ~~437-442 A detailed description is given of how the near-field length of probes can be determined experimentally. In the case of angle probes, it could be demonstrated that measurements obtained with the same probe when transmitting transverse waves iti steel exactly correspond with those obtained when longitudinal waves are transmitted in water. For this reason it is permissible to determine the near-field length for longitudinal waves in water and to calculate that for transverse waves in steel from the measured value. For the angle probes special AVG diagrams have been drawn by means of the near-field lengths (23mm for. type MWB, 73mm for type WB) determined for steel, and advice is given on making use of these diagrams. (Ultrasonics 1968, abstract 758) ULTRASONICS April 1968
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List of Scientific and Technical Publications’, )Willings Press Guide’, ‘Newspaper Press Directory’ and for American journals only, ‘Ayers’.
ABRAHAMS , C . J.
CRISLER, D. F. Relative ultrasonic amplification in vapour-phase grown zinc oxide crystals. Proceedings of the Institute of Electrical and Electronics Engineers,Vol 55, No 12 (December 1967) ~~2181-2182 The construction, operation and relative gain of an ultrasonic amplifier using a vapour-phase grown zinc oxide crystal as the amplifying medium are described. The mode of operation was compressional. The desired operational resistivity (- lo* ohm. cm) was obtained at 173% Maximum relative gain was about 52dB/cm. (Ultrasonics 1968, abstract 755)
Methods used in ultrasonic testing of welds. Welding and Metal Fabrication,Vol 35,No 11 (November 1967) pp458463 A detailed account of the procedures adopted for the ultrasonic examination of different types of welds is presented and the implications of the method in quality control are considered. (Ultrasonics 1968,abstract 749)
AVERBUCH,P., JAMES, L. W. and MAHLER, R. J. Nuclear ultrasonic fast passage. Applied Physics Letters, Vol ll,No 11 (December 1967) pp339-340 An ultrasonic fast passage experiment is described; the small resulting nuclear spin inversion (16%) is explained by inability to obtain ideal experimental conditions. (Ultrasonics 1968, abstract 750)
CHARPENTIER, J. and SINCLAIR,R. Ultrasonic pickling of copper-base materials. Journal of the Institute of Metals,Vol 96 (January 1968) p2439 A short series of tests has shown that the application of ultrasonic vibrations can increase, by factors between 1 and 15, the pickling rates in dilute sulphuric acid of several oxidized copper-base materials. Possible industrial applications are suggested and the economies of ultrasonic pickling are discussed briefly. (Ultrasonics 1968, abstract 751)
CONNOLLY, C. An ultrasonic generator giving widely variable ultrasonic parameters. Biomedical Engineering,Vol 3,No 2 (February 1968) ~~72-75 A detailed description is given of the construction of a generator of ultrasound whose parameters lie in the range between those used in diagnostic ultrasound and those used in surgery. The high intensities obtainable are of particular interest. (Ultrasonics 1968, abstract 752)
COSGROVE, D. G. Determining the linearity of an ultrasonic unit. Materials Evaluation,Vol 25,No 11 (November 1967) on259-263 This paper discloses’s new electronic means,-iyn-0-Chek, for accurate determination of the linearity of an ultrasonic unit. It presents the Lyn-0-Chek as both a maintenance tool and a quality control standard. The theory and use of this unit are described and compared with methods proposed by the American Society for Testing Materials in E127-61T and the Tentative Recommended Practice for Evaluating Performance Characteristics of a pulse-echo ultrasonic testing system as submitted to the committee E-7 Sub VI, Section I. (Ultrasonic 1968, abstract 753)
CRAWFORD,A. E. Ultrasonic generator using thyristors. Electronic Engineering, Vol 40, No 480 (February 1968) p66 An ultrasonic generator based on a thyristor circuit is described for application to ultrasonic cleaning systems. Details of design and practical construction are also given. (Ultrasonics 1968, abstract 754)
DE STERKE, A. Some aspects of radiography and ultrasonic testing of welds in steel with thicknesses from lOO-3OOmm. British Journal of Non-Destructive Testing, Vol 9, No 4 (December 1967) pp94-107 With increasing steel thickness problems are introduced not only in forming and welding but also in non-destructive examination. Non-destructive testing in heavy industry conjures up images of ultrasonic testing of big forgings or radiography of heavy castings. Radiography of forgings is seldom undertaken because the presence of cavities is very rare. During forging possible discontinuities in the original ingot are flattened and become difficult to reveal radiographically. However, ultrasonic testing is not such an obvious technique to discover flaws because cavities in castings are often irregular in shape. In general, they tend to scatter sound instead of producing clear signals. Structure as well as shape and surface condition are of appreciable influence. Here radiography offers advantages, providing ultrahard radiation is used for thick sections, in particular when a variety of thicknesses require a great latitute of the radiograph. (Ultrasonics 1968, abstract 756) FRASER, D. B., KRAUSE, J. T. and MEITZLER,A. H. Physical limitations on the performance of vitreous silica in high frequency ultrasonic and acousto-optical devices. Applied Physics Letters,Vol ll,No 10 (November 1967) pp308 -310 The usefulness of vitreous silica in a variety of high-frequency ultrasonic and acousto-optical devices is often limited by the acoustic properties of the material. This paper reports recent findings on (1) the acoustic loss-frequency dependence for shear waves in vitreous silica and (2) the magnitude of the fluctuation in the shear wave phase velocity. Information on shear wave propagation characteristics is most important for ultrasonic delay line applications for which the shear mode of propagation is predominantly used. (Ultrasonics 1968, abstract 757) FRIELINGHAUS, R. and SCHLENGERMANN, U. On the determination of nedr-field length of angle probes for ultrasonic materials testing. Materialpriifung, Vol 9, No 12 (December 1967) ~~437-442 A detailed description is given of how the near-field length of probes can be determined experimentally. In the case of angle probes, it could be demonstrated that measurements obtained with the same probe when transmitting transverse waves iti steel exactly correspond with those obtained when longitudinal waves are transmitted in water. For this reason it is permissible to determine the near-field length for longitudinal waves in water and to calculate that for transverse waves in steel from the measured value. For the angle probes special AVG diagrams have been drawn by means of the near-field lengths (23mm for. type MWB, 73mm for type WB) determined for steel, and advice is given on making use of these diagrams. (Ultrasonics 1968, abstract 758) ULTRASONICS April 1968
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