Reconstruction of Wide-Bandwidth Scattering Responses from Narrow-Bandwidth Ultrasound Echo in Air

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概要

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• We present an experimental evaluation of high-resolution acoustic impulse responses of structured objects in air, obtained by a new signal processing technique. Typical acoustic transducers in air have a high Q of 20 and a narrow pass band of 40 kHz around the resonance frequency of 200 kHz. First we simply deconvolved an echo signal from an object with the transfer function of the measuring system with the aid of a flat reflector. After an adequate extraction of the deconvolved spectrum in the passband, we extrapolated it to a wide-band spectrum from 0 Hz to 3 MHz by a factor of 75, applying a linear prediction using an autoregressive (AR) model and Levinson's recursive formula. Resolution of the reconstructed impulse responses of structured objects in air is equal to a sampling spacing Δx = 24 μm which corresponds to a sampling frequency of 7.14 MHz, and the range accuracy is within 5Δx.

• 社団法人応用物理学会の論文
• 1999-05-30

著者

• MIYASHITA Toyokatsu

  Department of Electronics and Informatics, Ryukoku University

• Matsumoto Takuya

  Department Of Chemical Engineering And Materials Science Doshisha University

• Itaya Takahiro

  Department Of Electronics And Informatics Ryukoku University

• Matsumoto Takuya

  Department Of Electronics And Informatics Ryukoku University

• Miyashita Toyokatsu

  Department Of Electrical Engineering Kyoto Institute Of Technology

• MATSUMOTO Takuya

  Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University

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