An Adaptive Spectroellipsometric Technology for The Remote Ecological Monitoring of The Aquatic Environment
F. A. Mkrtchyan, V. F. Krapivin, V.I. Kovalev, V.V. Klimov,
A. I. Rukovishnikov, and S.P. Golovachev
Institute of Radioengineering and Electronics, Russian Academy of Sciences
1, Vvedensky Square, Fryazino, Moscow Region, 141190, Russia
Tel.: 7+095+5269150, Fax: 7+096+5649060,
Email: sgolovachev@ms.ire.rssi.ru
ABSTRACT
The creation of multichannel polarization optical instrumentation is typical for the real-time
ecological control of aquatic environment. It should be mentioned that efficient solution of these
multiparametric problems greatly depends on the precision of ellipsometric devices and the
possibility of using a wide spectral range. Spectral measurements in an aquatic environment
provide an information basis for the application of modern algorithms for the recognition and
identification of pollutants.
This report is aimed at elaborating a multichannel spectroellipsometric system that will differ
from modern foreign analogues by the use of a new and very promising method of ellipsometric
measurements, an original element base of polarization optics and a complex mathematical
approach to estimating the quality of a water object subjected to anthropogenic influence.
The system will be trainable to the recognition of pollutants of aquatic environment. Also,
unlike foreign analogues, the system has no as well as rotating polarization elements. This
allows one to increase the signal-to-noise ratio and the long-term stability of measurements, to
simplify and reduce the price of multichannel spectroellipsometers.
The Adaptive Identifier
For the first time the combined use of real - time spectrometry measurements and data
processing methods has been implemented in an Adaptive Identifier, the main characteristics of
which are given in Table 1. For example, modern spectrophotometers provide some spectra per
second with a 1% precision and 0.01% response, and measurements of spectra of rotation
polarization plane in real time are carried out by spectropolarimeters with high precision. Its
creation became possible due to a new approach in the field of polarization optics. An effective
elemental base for polarization optics and a method of discrete modulation of the polarization
mode have been developed. The application of simple and highly effective polarization switches
and sets of silicon photodiodes with arbitrary access to them has essentially simplified the
problem of creating compact and cheap polarization - optical devices: spectrophotometers,
spectropolarimeters, spectroellipsometers, etc.
