Share Email Print
cover

Optical Engineering

Near-infrared spectropolarimeter using an acousto-optic tunable filter
Author(s): Zhongyang Chen; Jacob B. Khurgin; Jose Lorenzo; Feng Jin; Xiangchun Xiong; Ken Jia; Sudhir B. Trivedi; Jolanta I. Soos; Marion G. Hansen; Charles Russonmanno
Format Member Price Non-Member Price
PDF $20.00 $25.00

Paper 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.

Paper Details

Date Published: 1 July 2007
PDF: 6 pages
Opt. Eng. 46(7) 073605 doi: 10.1117/1.2753503
Published in: Optical Engineering Volume 46, Issue 7
Show Author Affiliations
Zhongyang Chen, Johns Hopkins Univ. (United States)
Jacob B. Khurgin, Johns Hopkins Univ. (United States)
Jose Lorenzo, Brimrose Corp. of America (United States)
Feng Jin, Brimrose Corp. of America (United States)
Xiangchun Xiong, Brimrose Corp. of America (United States)
Ken Jia, Brimrose Corp. of America (United States)
Sudhir B. Trivedi, Brimrose Corp. of America (United States)
Jolanta I. Soos, Brimrose Corp. of America (United States)
Marion G. Hansen, The Univ. of Tennessee (United States)
Charles Russonmanno, U.S. Dept. of Energy (United States)


© SPIE. Terms of Use
Back to Top