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Volume 27, Issue 6
Displaying 1-7 of 7 articles from this issue
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Tatsuaki Simizu, Yasuharu Suematsu, Kazuyasu Nomura, Eiji MoriArticle type: Article
1971 Volume 27 Issue 6 Pages 285-290
Published: June 10, 1971
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSThis paper gives experimental and theoretical studies of the measurement of small vibrational-displacement-amplitudes such as ultrasonic vibrators. The measurement is based on the Doppler shift of a laser beam from the vibrating surface. A measurement method which employs a laser beam with multiple axial-modes and a Michelson-interferometer-type optical system, is presented. It determines the displacement amplitude through the ratio of the harmonics of the frequency spectrum of detected signal, for example, the fundamental to the third-harmonics. An experiment was performed to verify this method. The resultant sensitivity was about 200i at the vibrational frequency 39 kHz.View full abstractDownload PDF (623K) -
Junichi FujiwaraArticle type: Article
1971 Volume 27 Issue 6 Pages 291-297
Published: June 10, 1971
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSOne of the most important problems, encountered in the analysis and design of underwater information transmission systems using ultrasonic waves, is how to quantitatively evaluate the effect of multi-path propagation due to surface reflection The author was provided with a probabaistic model to deal with the multi-path propagation problem. For the purpose of demonstrating the applicability of the model, the experiments were carried out in an unechoic water tank with a free surface. The results and the statistical analysis obtained by using a digital computer are described It has become evident that the multi-path propagation plays an important role in the trade-off among various design parameters. Therefore the concepts developed are to be applied to the design of an underwater telemetry system.View full abstractDownload PDF (761K) -
Shizuo HikiArticle type: Article
1971 Volume 27 Issue 6 Pages 298-299
Published: June 10, 1971
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSDownload PDF (198K) -
Yoshinori AndoArticle type: Article
1971 Volume 27 Issue 6 Pages 300-305
Published: June 10, 1971
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSDownload PDF (729K) -
Jun'ichi SaneyoshiArticle type: Article
1971 Volume 27 Issue 6 Pages 306-308
Published: June 10, 1971
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSDownload PDF (340K) -
Takashi FujitaArticle type: Article
1971 Volume 27 Issue 6 Pages 309-310
Published: June 10, 1971
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSDownload PDF (266K) -
Ken'iti KidoArticle type: Article
1971 Volume 27 Issue 6 Pages 311-316
Published: June 10, 1971
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSDownload PDF (548K)
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