Chemical sensors and indicators based on different light guides (fiber- and integrated-optics) have been
designed and tested, the sensitive substances having been introduced into outer layers of the light guides. The
sensors are intended for detection of the solvent vapours such as acetone, ethanol, methanol etc. Obtained
results and practical recommendations are discussed.
The developments and researches results are reported concerning new optical media with required properties on the basis of sodium-borate-silicate nanoporous glasses (PG) which contain on its surface the physically sorbed metal- complexes and organic compositions. These media demonstrate the characteristics not achievable with use of preparative methods both for solid materials and for liquid solutions. First of all this concerns the organic dye molecules and metal-complexes immobilized on the surface of PG.
This paper is to originally present the results of a research of temporal and frequency structures of laser pulse and laser-induced acoustic one generated in human tooth enamel and dentine. An impact of tooth surface water spray on a deformation character of laser-induced acoustic signal frequency Fourier-spectrum has been defined also.
A number of color absorption and luminescence indicators being dispersed within a porous matrix have been investigated by means of spectral techniques. As a support for the indicator molecules served a mesoporous silica glass of Vycor type (pore size of 7.5 nm) which was transparent to the light and permeable to the ambient gases and vapors. The selected immobilized indicators have revealed the well-defined spectral sensitivity to certain components of an atmosphere or other gas mixture. After a proper chemical and thermal treatment these indicators have gained high selectivity of spectral response on an individual gas appearing in the ambients, the observed spectral changes have demonstrated its reversibility. The indicators immobilized within the porous glass turned out to be mostly advantageous as applied in the colorimetric sensors and anlyzyers, sepcifically in the automated remote air monitoring systems. Some of the essential parameters of the developed portable individual gas analyzers and remote multicomponent monitoring systems with use of fiber optic guides are reported.