Acoustic Image Converter for Three-Step Acoustic Holography
A unique Acoustic Image Converter with microhorn structure in the output stage is developed. The converter constitutes a fundamental link in the three step method of acoustic holography. Using real time optical holographic interferometry for the detection of the acoustical hologram. The sensitivity, already enhanced by the step bias method, is further increased by the improved Acoustic impedance match of the converter and by the micro-horn structure. The most important function of the latter, however, is the minimization of lateral cross coupling in the transfer of acoustic interference patterns from water to air media. Recent results of acoustic holography method incorporating the new converter are presented.
KeywordsHalf Wave Brightness Distribution Holographic Interferometry Quarter Wave Image Converter
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- 1.Kinsler, L.E. and Fry, A.R.,“Fundamental of Acoustics, J. Willey Inc., NY, 1952.Google Scholar
- 2.Fischer, W. K., ’’Methods for Acoustical Holography and Acoustical Measurements,“ Doctoral issertation, NCE, 1972.Google Scholar
- 5.Ensminger, D. “Ultrasonic, the Low and High Intensity Applications,” M. Dekker, NY, 1973.Google Scholar
- 6.Hanafy, A. and Zambuto, M, “Step Bias Holographic Interferometry,” Paper presented at Annual Meeting, OSA, Boston, MA, 1975Google Scholar
- 8.White, D.W., and Burke, J.E., “The Metal Beryllium,” The American Society of Metals, 1955.Google Scholar