Colorimetric determination of trace pollutants in water using photothermal deflection spectroscopy

Author

Ofori-Boadu, G. ; Peterson, K.M. ; Mangana, J. ; Hommerich, U.

Author_Institution

Dept. of Phys., Hampton Univ., VA, USA

fYear

1992

fDate

23-28 May 1992

Firstpage

135

Abstract

Summary form only given. Photothermal deflection spectroscopy (PDS) is a well-known technique for measuring small absorbencies in gases, liquids, and solids (<10/sup -6/). The basic principle of this technique are relatively simple. A pump laser passes through a medium and is partially absorbed. A fraction of the absorbed energy is released as heat, which results in a spatially and temporally modified refractive index field. The photoinduced refractive index change can be monitored through the deflection of a probe beam.

Keywords

colorimetry; measurement by laser beam; optical parametric oscillators; optical pumping; photothermal spectroscopy; water pollution measurement; H/sub 2/O; absorbed energy; basic principle; colorimetric determination; gases; light absorption; liquids; photothermal deflection spectroscopy; pump laser; small absorbencies; solids; spatially modified refractive index field; temporally modified refractive index field; trace pollutants; water; Gas lasers; Gases; Laser excitation; Liquids; Pollution measurement; Pump lasers; Refractive index; Solids; Spectroscopy; Water pollution;

fLanguage

English

Publisher

ieee

Conference_Titel

Quantum Electronics and Laser Science Conference, 1999. QELS '99. Technical Digest. Summaries of Papers Presented at the

Conference_Location

Baltimore, MD, USA

Print_ISBN

1-55752-576-X

Type

conf

DOI

10.1109/QELS.1999.807429

Filename

807429