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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 13 — May. 1, 1999
  • pp: 2812–2819

Measurement of ultrasonic pressure by heterodyne interferometry with a fiber-tip sensor

Christian Koch  »View Author Affiliations


Applied Optics, Vol. 38, Issue 13, pp. 2812-2819 (1999)
http://dx.doi.org/10.1364/AO.38.002812


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Abstract

A fiber-optic measurement system is described that allows ultrasound to be detected in fluids. It is based on a heterodyne interferometer, and the sensing element consists of a metal-coated fiber tip. The heterodyne technique permits direct acquisition of the sound pressure. The required ac photodetection is carried out with wide bandwidth, and the system provides high temporal and spatial resolution. For optimum performance the system parameters are matched to the sound-wave properties of the current application with the aid of theoretical and numerical calculations. The fiber-optic sensor system was applied to two problems of ultrasonic exposimetry in which the favorable features of the measurement technique were exploited. Shock waves from an electromagnetic lithotripter were investigated by use of the wide bandwidth of the system, and the subharmonic in an ultrasonic cleaner was detected, which indicates cavitation.

© 1999 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(170.7170) Medical optics and biotechnology : Ultrasound

History
Original Manuscript: September 15, 1998
Revised Manuscript: January 19, 1999
Published: May 1, 1999

Citation
Christian Koch, "Measurement of ultrasonic pressure by heterodyne interferometry with a fiber-tip sensor," Appl. Opt. 38, 2812-2819 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-13-2812


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