Abstract

Calibration of the relationship between the scattering angle and the CCD pixel is a key part of achieving accurate measurements of rainbow refractometry. A novel self-calibrated global rainbow refractometry system based on illumination by two lasers of different wavelengths is proposed. The angular calibration and refractive index measurement of two wavelengths can be completed simultaneously without extra measurement devices. The numerical and experimental results show the feasibility and high precision of the self-calibration method, which enables the rainbow refractometry to be implemented in a more powerful and convenient way. The self-calibrated rainbow system is successfully applied to measure the refractive indices of ethanol-water solutions with volume concentrations of 10% to 60%.

© 2017 Chinese Laser Press

One-dimensional rainbow technique using Fourier domain filtering

Yingchun Wu, Jantarat Promvongsa, Xuecheng Wu, Kefa Cen, Gerard Grehan, and Sawitree Saengkaew
Opt. Express 23(23) 30545-30556 (2015)

Synthetic aperture rainbow refractometry

Xinhao Wang, Yingchun Wu, Dongyan Xu, Botong Wen, Qimeng Lv, and Xuecheng Wu
Opt. Lett. 47(20) 5272-5275 (2022)

Planar rainbow refractometry

Can Li, Qimeng Lv, Ning Li, Yingchun Wu, Xuecheng Wu, Chunsheng Weng, and Cameron Tropea
Opt. Lett. 46(23) 5898-5901 (2021)

Composition measurements of binary mixture droplets by rainbow refractometry

J. Wilms and B. Weigand
Appl. Opt. 46(11) 2109-2118 (2007)

Phase rainbow refractometry for accurate droplet variation characterization

Yingchun Wu, Jantarat Promvongsa, Sawitree Saengkaew, Xuecheng Wu, Jia Chen, and Gérard Gréhan
Opt. Lett. 41(20) 4672-4675 (2016)