We describe twin-rainbow metrology, a new optical technique used to measure the thickness of thin films in a cylindrical geometry. We also present an application of the technique: measurement of the thickness of a Newtonian fluid draining under gravity. We compare these measurements with fluid mechanics models.
© 2003 Optical Society of America
Original Manuscript: January 24, 2003
Revised Manuscript: June 11, 2003
Published: November 20, 2003
Charles L. Adler, James A. Lock, Ian P. Rafferty, and Wayne Hickok, "Twin-rainbow metrology. I. Measurement of the thickness of a thin liquid film draining under gravity," Appl. Opt. 42, 6584-6594 (2003)