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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 21 — Jul. 20, 2013
  • pp: 5318–5326

Measurement of the refractive index of microquantity liquid filled in a capillary and a capillary wall without destruction

Qiang Li and Xiaoyun Pu  »View Author Affiliations


Applied Optics, Vol. 52, Issue 21, pp. 5318-5326 (2013)
http://dx.doi.org/10.1364/AO.52.005318


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Abstract

A method for measuring the refractive index (RI) of a small volume of liquid and a capillary wall is presented in this paper. A transparent capillary filled with liquid is used as a cylindrical positive lens; subsequently, the focal length of the lens is derived through the base of paraxial approximation, which is recorded as a function of the RIs of the liquid and capillary wall. With the RI of a capillary wall known, the RI of the liquid can be obtained by measuring the focal length of the lens, which is characterized by a microquantity liquid, spatial resolution, and easy operation. The RI of the capillary wall can be calculated without ruining the capillary if the capillary is filled with a standard liquid (RI is known), the deviation of which is less than 0.003 RIU. The factors affecting accuracy of the measurement, for instance, the depth of a field (DOF) in a reading microscope system and the outer and inner diameters of a capillary are analyzed, while illustrating that the effective DOF plays an essential role in accurate measurement.

© 2013 Optical Society of America

OCIS Codes
(080.0080) Geometric optics : Geometric optics
(110.2960) Imaging systems : Image analysis
(120.4640) Instrumentation, measurement, and metrology : Optical instruments

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: April 9, 2013
Revised Manuscript: June 6, 2013
Manuscript Accepted: June 24, 2013
Published: July 19, 2013

Citation
Qiang Li and Xiaoyun Pu, "Measurement of the refractive index of microquantity liquid filled in a capillary and a capillary wall without destruction," Appl. Opt. 52, 5318-5326 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-21-5318


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