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Diffractive optics for spatial and temporal analysis of pollution in liquid media

M. MIHAILESCU1,* , A. M. PREDA1, A. SOBETKII2, E. I. SCARLAT1, L. PREDA1

Affiliation

  1. Physics Department, University “Politehnica” of Bucharest, Romania
  2. OPTICOAT SRL, Bucharest, Romania

Abstract

We designed some diffractive optical elements (DOEs) in order to utilize them in optoelectronics setups to establish spatial and temporal optical path variations of pollution in liquid media. In the design algorithm, besides classical parameters (the diffraction efficiency, the contrast in desired spots, the wavelength, the divergence angle of every desired spots), we optimized the diffractive pattern to have information in the same time from many fixed points of the investigated volume. We analyzed different experimental setups with diffractive beam splitter and we selected the suitable optoelectronic components for each investigated liquid sample. Our setups permit measurements of the optical path variations due to geometrical path variations or refractive index variations. Changes in concentrations or in chemical composition of the sample induce refractive index gradients and the intensity distribution in diffractive patterns is modified. The monitoring of the spatial and temporal changes in diffractive pattern was done with CCD and processed on the computer. To calibrate our method, we utilized some mixtures of water-glucose or water-CuSO4 in known percentages. Our results are complementary with those obtained with classical physical-chemical analysis and permit automated spatial and temporal monitoring of the polluted liquid media in big volumes..

Keywords

Diffractive optical element, Pollution, Liquid media, Refractive index.

Submitted at: Aug. 1, 2007
Accepted at: Nov. 16, 2007

Citation

M. MIHAILESCU, A. M. PREDA, A. SOBETKII, E. I. SCARLAT, L. PREDA, Diffractive optics for spatial and temporal analysis of pollution in liquid media, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 11, pp. 3499-3504 (2007)