Abstract
Prior work dealing with optical imaging of sound waves was devoted to nondestructive testing applications at sound frequencies of 1 MHz and higher. Bragg diffraction of light by sound waves permits one to obtain optical images of sound fields on a real time basis. This paper describes the formation of optical images of sound fields which are at frequencies of approximately 100 KHz and higher for sonar applications. A new dual frequency optical heterodyning technique, necessary for image formation at low sound intensity and low frequencies, was devised for sonar applications. Optical images of objects insonified at a distance of 5 meters from the Bragg cell are presented. Experimental results pertaining to sensitivity measurements are given and compared with sensitivity reported for other imaging systems.
Work supported in part by Defense Advanced Projects Agency (ARPA Order No. 1951) under contract with the Office of Naval Research (Contract N00014-72-C-0182).
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References
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© 1975 Springer Science+Business Media New York
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Cole, J.H., Smith, R.A., Johnson, R.L., Bhuta, P.G. (1975). Optical Imaging Sonar. In: Booth, N. (eds) Acoustical Holography. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8216-8_21
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DOI: https://doi.org/10.1007/978-1-4615-8216-8_21
Publisher Name: Springer, Boston, MA
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