1 July 2007 Near-infrared spectropolarimeter using an acousto-optic tunable filter
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Optical Engineering, 46(7), 073605 (2007). doi:10.1117/1.2753503
Abstract
The long chain of a polymer molecule often has intrinsic linear birefringence and/or dichroism, which lead to macroscopic properties when the molecules have a preferred orientation under nonequilibrium conditions, such as flow of a polymer melt. Measurements of properties, including linear birefringence, in a polymer melt can in turn lead to valuable insights into its structure, morphology, and rheology. We demonstrate that a spectropolarimeter based on an acousto-optic tunable filter can measure linear birefringence in real time during the manufacture of polymers, at hundreds of wavelengths, within 5 min, and thus provides more information than use of a spectrometer or laser-based polarimetry alone. In this work, optical properties of different molten ethylene vinyl acetate samples were measured with a spectropolarimeter based on an acousto-optic tunable filter and a photoelastic modulator in the near infrared. Regression models of the results indicate good correlation between the melt indices of the samples and the measured spectra.
Zhongyang Chen, Jacob B. Khurgin, Jose Lorenzo, Feng Jin, Xiangchun Xiong, Ken Jia, Sudhir B. Trivedi, Jolanta I. Soos, Marion G. Hansen, Charles Russonmanno, "Near-infrared spectropolarimeter using an acousto-optic tunable filter," Optical Engineering 46(7), 073605 (1 July 2007). http://dx.doi.org/10.1117/1.2753503
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KEYWORDS
Polymers

Birefringence

Acousto-optics

Tunable filters

Molecules

Polarization

Manufacturing

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