Optical rotatory dispersion (ORD) is an important property of chiral material. How to obtain the ORD curve of chiral material quickly and accurately has attracted great attention from researchers. This work presents a measurement method of ORD based on a polarization axis finder (PAF) and a conical lens (CL). The PAF can modulate the collimated broad-spectrum beam spatially to form an “hourglass” intensity pattern, and the CL can disperse the polarization information of light of different wavelengths to different positions in space. The use of the PAF and the CL enables the ORD of the sample to be obtained with only a single image. We perform a theoretical analysis of this method to prove it is feasible and verify it experimentally with left-hand quartz (LHQ) as the sample. Both theoretical and experimental results prove that this method is a fast and effective way to determine the ORD of chiral substances.
Polarimetry is an important noninvasive blood glucose measurement method and attracts extensive attention from researchers. However, one of the difficulties associated with polarimetry is the low concentration of blood glucose, which results in weak optical rotation signals. In this paper, we report a fast and accurate spatial polarization modulation system (SPMS) that can measure the low glucose concentration by analyzing a single digital image. In this system, the rotated polarizer gain mechanism (RPGM) is adopted to amplify the weak optical rotation signals. And in order to extract the optical rotation signals from the background more easily, a vortex phase difference retarder (VPDR) is employed to modulate the optical rotation signals, which is a specially designed birefringent crystal with a vortex phase difference along the azimuth angle. We have established the theoretical model of the SPMS by the Jones matrix theory, and both the simulation experiments with noise and without noise have shown that the SPMS has a resolution of 100mg/dl.
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