National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Detection of aromatic hydrocarbons in air and water by using xerogel layers coated on PCS fibers excited by an inclined collimated beam
Cherif, K. ; Hleli, S. ; Abdelghani, A. ; Jaffrezic-Renault, N. ; Matějec, Vlastimil ; Mrázek, Jan ; Chomát, Miroslav ; Kašík, Ivan
This paper deals with the detection of aromatic hydrocarbons in air or water which is based on refractive-index changes of a silica xerogel detection layer applied on silica optical fiber. The fiber is excited by an inclined collimated beam. The sensitivity of the tetraethoxysilane- and methyltriethoxysilane- based xerogel layers to benzene and toluene in air and in liquid water are presented. The detection limits were about 500 and 5 ppm for air and water, respectively.
Optical fibers for chemical sensing
Matějec, Vlastimil ; Chomát, Miroslav ; Kašík, Ivan
The paper deals with performance of optical fibers for the development of chemical fibers. In its first part, there are physical basis shown are employed for the sensor design. Characteristics of particular types of fibers used in fiber-optic chemical sensors, namely polymer-clad silica /PCS/ fibers, sectorial fibers or fibers with special graded-index profiles are discussed in the next parts of the paper.

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