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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 19 — Oct. 1, 2012
  • pp: 4092–4094

Measuring the reflectance of hidden color objects with acoustically modulated laser speckle

Terence S. Leung and Shihong Jiang  »View Author Affiliations

Optics Letters, Vol. 37, Issue 19, pp. 4092-4094 (2012)

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We demonstrate a technique to measure the reflectance of colored objects, including blue, green, and yellow, hidden behind an opaque slab based on acoustically modulated laser speckle. One colored paper at a time was placed behind a 1 cm thick opaque slab with an air gap of 5 mm. Small periodic movements (nanometer scale) at 200 Hz were induced in the colored paper. A coherent red He–Ne laser illuminated the front of the slab, producing acoustically modulated speckle patterns, which were captured by a CCD camera. The magnitude of the time-varying speckle intensity is indicative of the hidden colored paper’s reflectance.

© 2012 Optical Society of America

OCIS Codes
(300.6480) Spectroscopy : Spectroscopy, speckle
(170.1065) Medical optics and biotechnology : Acousto-optics
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:

Original Manuscript: July 18, 2012
Revised Manuscript: August 13, 2012
Manuscript Accepted: August 27, 2012
Published: September 26, 2012

Terence S. Leung and Shihong Jiang, "Measuring the reflectance of hidden color objects with acoustically modulated laser speckle," Opt. Lett. 37, 4092-4094 (2012)

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