Journal of Pure and Applied Ultrasonics

Omprakash P. Chimankar ¹, Yudhisther Kumar Yadav ²

Affiliations
1 Department of Physics, R.T.M. Nagpur University Campus, Amravati Road, Nagpur 440 033, IN
2 CSIR-National Physical Laboratory, Dr. K S Krishnan Marg, New Delhi 110012, IN

Abstract

The International Symposium on Ultrasonics (ISU-2015) was organized during 22-24 January 2015 by Department of Physics, R.T.M. Nagpur University, Nagpur jointly with Ultrasonic Society of India (USI). The venue of the symposium was BSNL Regional Telecom Training Centre (RTTC), Seminary Hills, Nagpur. Shri Mathuradas Mohota Science College, Shivaji Science College, and Institute of Science, all at Nagpur, were the co-hosts. The symposium was sponsored by DST, DRDO, UGC, RTM Nagpur University and Mittal Enterprises, New Delhi.

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Yudhisther Kumar Yadav ¹

Affiliations
1 CSIR-National Physical Laboratory, New Delhi-110012, IN

Abstract

The work has been carried out at CSIR-National Physical Laboratory (NPL) on development of method for measurement of absolute attenuation. The paper reports techniques of measurement and the work carried out at NPL referring to the work carried out by earlier workers on attenuation measurement. The beam diffraction correction has either been ignored or taken from a reference graph by earlier workers. Present method developed involves beam diffraction correction and requires no reference values. The method is useful to evaluate attenuation values at different frequencies within 6dB band width of transducer. No need to use different transducers of different frequencies. In the present method a broad band ultrasonic transducer is used in the immersion testing set up. Ultrasonic spectrum analysis technique, using fast Fourier Transform, is used to evaluate various echo amplitudes of the received signals with respect to corresponding frequencies. Measurements were taken on aluminum and steel alloy sample blocks. Technique uses single longitudinal wave normal beam transducer to measure both longitudinal and transverse wave attenuation in materials employing isotropic rod sample at different frequencies.

Keywords

Ultrasonic Attenuation, Diffraction Correction, L-Wave Pulse-Echo Method.

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Yudhisther Kumar Yadav ¹

Affiliations
1 NPL, New Delhi, IN

Abstract

Guru Nanak Dev University, Amritsar and Ultrasonic Society of India jointly organized the XII-National Symposium on Ultrasonics (XII-NSU) during November 3-5, 2003 at Amritsar. The theme of the symposium was an effort to bring to-gather all active researchers, users of ultrasonics and industrialists engaged in manufacturing equipments on application of ultrasonics. Research papers were invited relevant to physical ultrasonics, medical ultrasonic, sensors and transducers, non-destructive evaluation, industrial ultrasonics, characterization of materials, MEMS, photo acoustics and acoustic emission.

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Yudhisther Kumar Yadav ¹

Affiliations
1 Ultrasonics Society of India, IN

Abstract

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