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- W2013012904 abstract "Several authors have reported the detection of continuous ultrasonic waves in transparent media by interferometric transmission techniques [C. H. Palmer, R. O. Claus, and S. E. Fick, Appl. Opt. 16, 1849 (1977); D. P. Jablonowski, Appl. Opt. 17, 2064 (1978)]. In this paper, the measurement of broadband acoustic pulses in a water tank by a wideband differential optical system is discussed. The two coherent light beams in this system are narrowly collimated and propagated through the tank along lines parallel to the generated ultrasonic wavefronts and normal to their direction of propagation. A change in the index of refraction of the water caused by the acoustic field at the location of one optical beam alters the optical phase difference between the beams and is interferometrically detected. Since the optical beams are separated, the acoustic pulse modulates them at different times and two detected differential signals of opposite sign are observed. Beam separation determines the lower frequency response limit of the system; upper frequency response is limited to approximately 100 MHz by the diameter of the optical beams. Applications in the scanning of three-dimensional acoustic fields is indicated. [Work supported in part by NASA and NSF.]" @default.
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- W2013012904 date "1982-11-01" @default.
- W2013012904 modified "2023-09-24" @default.
- W2013012904 title "Detection of broadband acoustic pulses in liquids using wideband differential interferometry" @default.
- W2013012904 doi "https://doi.org/10.1121/1.2019994" @default.
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