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Applied Optics

Applied Optics


  • Vol. 41, Iss. 10 — Apr. 1, 2002
  • pp: 1899–1907

Rainbow refractometry: simultaneous measurement of temperature, refractive index, and size of droplets

James Hom and Norman Chigier  »View Author Affiliations

Applied Optics, Vol. 41, Issue 10, pp. 1899-1907 (2002)

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The capabilities and limitations of rainbow refractometry, specifically the minimum measurable droplet size and the errors in the refractive index (temperature), have been studied. We evaluate what we believe is a new method of indirectly applying the Lorenz-Mie theory to rainbow refractometry. The results show that this new method reduces the errors and eliminates the biases that may occur if the Airy theory is used. A more precise method to filter the high-frequency oscillations associated with the measurement signals was developed. Finally, it was discovered that the errors associated with rainbow refractometry are such that a single droplet measurement is unreliable. A mean refractive index should be determined on the basis of multiple droplet measurements.

© 2002 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.6780) Instrumentation, measurement, and metrology : Temperature

Original Manuscript: June 1, 2001
Revised Manuscript: October 29, 2001
Published: April 1, 2002

James Hom and Norman Chigier, "Rainbow refractometry: simultaneous measurement of temperature, refractive index, and size of droplets," Appl. Opt. 41, 1899-1907 (2002)

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