Fiber optic aspects of UV laser spectroscopic in situ detection of water pollutants

Georg Hillrichs; Peter Karlitschek; Walter Neu

doi:10.1117/12.190967

21 October 1994 Fiber optic aspects of UV laser spectroscopic in situ detection of water pollutants

Georg Hillrichs, Peter Karlitschek, Walter Neu

Proceedings Volume 2293, Chemical, Biochemical, and Environmental Fiber Sensors VI; (1994) https://doi.org/10.1117/12.190967
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

The use of different ultraviolet lasers for fluorescence spectroscopic detection of water pollutants with fiber optical sensors has been studied. Especially detection of small aromatic hydrocarbons via laser induced fluorescence requires short wavelength excitation. Interaction of intense ultraviolet light with the commonly used fused silica fibers leads to a decrease of fiber transmission. Some transmission affecting laser parameters have been studied. A new concept for the use of fiber optic sensors with ultraviolet excitation has been developed. This method is based on transmission of visible laser radiation through the fiber and creation of ultraviolet radiation by optical harmonic generation at the distal end of the fiber. So the unfavorable fiber behavior at short wavelengths can be avoided. Simultaneous coupling of the beam from a single laser source into several optical fibers is interesting for distributed sensor applications. In order to minimize coupling losses for these purposes we developed a new coupling scheme based on a special optical lens array.

Citation Download Citation

Georg Hillrichs, Peter Karlitschek, and Walter Neu "Fiber optic aspects of UV laser spectroscopic in situ detection of water pollutants", Proc. SPIE 2293, Chemical, Biochemical, and Environmental Fiber Sensors VI, (21 October 1994); https://doi.org/10.1117/12.190967

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