Analysis of laser intensity attenuation and compensation and the influence on imaging through particle field

Xiangju Qu; Yang Song; Liang Xu; Ying Jin; Zhenhua Li; Anzhi He

doi:10.1117/12.2284901

24 October 2017 Analysis of laser intensity attenuation and compensation and the influence on imaging through particle field

Xiangju Qu, Yang Song, Liang Xu, Ying Jin, Zhenhua Li, Anzhi He

Author Affiliations +

Proceedings Volume 10462, AOPC 2017: Optical Sensing and Imaging Technology and Applications; 104622N (2017) https://doi.org/10.1117/12.2284901
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China

Abstract

In 3D particle image velocimetry (PIV), when laser transports through dense trace particle field, scattering light intensity vary in different directions. In this article, we build 5 fields of different densities, and each field contains one vortex ring. The diameter of the vortex ring is 2mm, and the particles are dense in the ring and sparse outside the ring. Based on the Mie scattering theory and Monte Carlo method, we compute the laser intensity difference along the direction of incident light in each particle volume when the laser beam transports through it, and obtain the relationship of laser intensity, particle density and the distance of laser transportation. The variation of laser intensity could also be viewed from different directions. We also discussed the influence of light intensity variation on integrated imaging particle-imagevelocimetry (PIV) image’s quality in this paper. To deal with this variation, we propose a new light intensity equalized compensation method. By using this method, we can reduce the influence of attenuation when laser light transports through dense particle areas. During the simulation process, a camera array is set to detect the forward and back direction of the laser beam in the region, and the light intensity is recorded by different pixels. Light intensity attenuation of different positions is considered. All cameras are treated as pinhole models. The results show that front scattering and back scattering have great effects on integrated imaging PIV. The compensation method is used in experiment to preprocess particle images.

Citation Download Citation

Xiangju Qu, Yang Song, Liang Xu, Ying Jin, Zhenhua Li, and Anzhi He "Analysis of laser intensity attenuation and compensation and the influence on imaging through particle field", Proc. SPIE 10462, AOPC 2017: Optical Sensing and Imaging Technology and Applications, 104622N (24 October 2017); https://doi.org/10.1117/12.2284901

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available