Title :
Detection of explosives and CO2 dissolved in water with an evanescent field sensor
Author :
Orghici, R. ; Willer, U. ; Gierszewska, M. ; Waldvogel, S.R. ; Schade, W.
Author_Institution :
Inst. of Phys. & Phys. Technol., Clausthal Univ. of Technol., Clausthal-Zellerfeld
Abstract :
A fiber optic approach for the determination of the carbon dioxide concentration in the gas or fluid phase during sequestration as well as for the sensing of the explosive TNT will be presented. The sensor consists of a quartz glass multimode fiber with core diameter of 200 mum and is based on the evanescent field principle. Cladding and jacket of the fiber are removed in the sensing portion, therefore interaction between light within the fiber and the surrounding medium is possible. A single-mode distributed feedback (DFB) laser diode with an emission wavelength around lambda= 1.57 mum and a frequency doubled passively Q-switched Cr4+:Nd3+:YAG microchip laser (lambda= 1064 nm) are used as light sources. The experimental setup and the sensitivity of the evanescent-field-sensor are characterized.
Keywords :
Q-switching; carbon compounds; chemical sensors; chemical variables measurement; climate mitigation; distributed feedback lasers; explosives; fibre optic sensors; infrared sources; measurement by laser beam; microchip lasers; optical glass; quartz; semiconductor lasers; CO2; DFB laser; SiO2; TNT sensing; YAG:Cr4+,Nd3+; carbon dioxide concentration determination; evanescent field sensor; explosive detection; fiber cladding; fiber jacket; fiber optic sensor; fluid phase; frequency doubled passively Q-switching; gas phase; laser emission; light interaction; light sources; quartz glass multimode fiber; sequestration; single-mode distributed feedback laser diode; size 200 mum; wavelength 1.57 mum; wavelength 1064 nm; Carbon dioxide; Chromium; Diode lasers; Distributed feedback devices; Explosives; Frequency; Gas detectors; Glass; Optical fiber sensors; Optical fibers;
Conference_Titel :
Lasers and Electro-Optics, 2008 and 2008 Conference on Quantum Electronics and Laser Science. CLEO/QELS 2008. Conference on
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-55752-859-9
