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Applied Optics

Applied Optics


  • Vol. 37, Iss. 28 — Oct. 1, 1998
  • pp: 6690–6694

Sagnac-interferometer-based Fresnel flow probe

Alexander Tselikov and James Blake  »View Author Affiliations

Applied Optics, Vol. 37, Issue 28, pp. 6690-6694 (1998)

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We used a near-diffraction-limited flow or light-wave-interaction pipe to produce a Sagnac-interferometer-based Fresnel drag fluid flowmeter capable of detecting extremely small flow rates. An optimized design of the pipe along with the use of a state-of-the-art Sagnac interferometer results in a minimum-detectable water flow rate of 2.4 nl/s [1 drop/(5 h)]. The flowmeter’s capability of measuring the water consumption by a small plant in real time has been demonstrated. We then designed an automated alignment system that finds and maintains the optimum fiber-coupling regime, which makes the applications of the Fresnel-drag-based flowmeters practical, especially if the length of the interaction pipe is long. Finally, we have applied the automatic alignment technique to an air flowmeter.

© 1998 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(280.2490) Remote sensing and sensors : Flow diagnostics

Original Manuscript: May 12, 1998
Published: October 1, 1998

Alexander Tselikov and James Blake, "Sagnac-interferometer-based Fresnel flow probe," Appl. Opt. 37, 6690-6694 (1998)

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  1. R. deCarvalho, J. Blake, W. Sorin, “A Fresnel drag flow meter,” in Digest of the Ninth Optical Fiber Sensors Conference (Optical Society of America, Washington, D.C., 1993), pp. 397–400.
  2. R. deCarvalho, J. Blake, “Slow-flow measurements and fluid dynamics analysis using the Fresnel drag effect,” Appl. Opt. 33, 6073–6077 (1994). [CrossRef]
  3. A. Tselikov, J. Blake, “Fresnel drag measurements for determination of ultra-slow flow rates,” in Optical Fiber Sensors, Vol. 16 of 1997 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1997), pp. 206–209.
  4. G. A. Sanders, S. Ezekeil, “Measurements of Fresnel drag in moving media using a ring-resonator,” J. Opt. Soc. Am. B 5, 674–678 (1988). [CrossRef]
  5. J. N. Blake, B. Szafraniec, J. R. Feth, K. Diamond, “Progress in low-cost interferometric fiber optic gyros,” in Sensors and Sensor Systems for Guidance and Navigation II, S. S. Welch, ed., Proc. SPIE1694, 188–192 (1992). [CrossRef]

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