skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Fiber optics spectrochemical emission sensors

Abstract

A method is described of in situ monitoring of a body of a fluid stored in a tank or groundwater or vadose zone gases in a well for the presence of selected chemical species. The method uses a probe insertable into the well or tank via a cable and having an electrical apparatus for exciting selected chemical species in the body of fluid. The probe can have a pair of electrodes for initiating a spark or a plasma cell for maintaining a plasma to excite the selected chemical species. The probe also has an optical apparatus for receiving optical emissions emitted by the excited species and optically transmitting the emissions via the cable to an analysis location outside the well. The analysis includes detecting a selected wavelength in the emissions indicative of the presence of the selected chemical species. A plurality of probes can be suspended at an end of a respective cable, with the transmitting and analyzing steps for each probe being synchronized sequentially for one set of support equipment and instrumentation to monitor at multiple test points. The optical apparatus is arranged about the light guide axis so that the selected chemical species are excited in the fluidmore » in alignment with the light guide axis. Optical emissions are received from the excited chemical species along such axis. 18 figs.« less

Inventors:
;
Issue Date:
OSTI Identifier:
7207238
Patent Number(s):
5085499 A
Application Number:
PPN: US 7-239778
Assignee:
Battelle Memorial Inst., Richland, WA (United States) PTO; EDB-94-083633
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Patent
Resource Relation:
Patent File Date: 2 Sep 1988
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; GROUND WATER; CONTAMINATION; MONITORS; DESIGN; OPTICAL EQUIPMENT; POLLUTANTS; MONITORING; WATER POLLUTION; EQUIPMENT; HYDROGEN COMPOUNDS; MEASURING INSTRUMENTS; OXYGEN COMPOUNDS; POLLUTION; WATER; 540220* - Environment, Terrestrial- Chemicals Monitoring & Transport- (1990-)

Citation Formats

Griffin, J.W., and Olsen, K.B. Fiber optics spectrochemical emission sensors. United States: N. p., 1992. Web.
Griffin, J.W., & Olsen, K.B. Fiber optics spectrochemical emission sensors. United States.
Griffin, J.W., and Olsen, K.B. Tue . "Fiber optics spectrochemical emission sensors". United States.
@article{osti_7207238,
title = {Fiber optics spectrochemical emission sensors},
author = {Griffin, J.W. and Olsen, K.B.},
abstractNote = {A method is described of in situ monitoring of a body of a fluid stored in a tank or groundwater or vadose zone gases in a well for the presence of selected chemical species. The method uses a probe insertable into the well or tank via a cable and having an electrical apparatus for exciting selected chemical species in the body of fluid. The probe can have a pair of electrodes for initiating a spark or a plasma cell for maintaining a plasma to excite the selected chemical species. The probe also has an optical apparatus for receiving optical emissions emitted by the excited species and optically transmitting the emissions via the cable to an analysis location outside the well. The analysis includes detecting a selected wavelength in the emissions indicative of the presence of the selected chemical species. A plurality of probes can be suspended at an end of a respective cable, with the transmitting and analyzing steps for each probe being synchronized sequentially for one set of support equipment and instrumentation to monitor at multiple test points. The optical apparatus is arranged about the light guide axis so that the selected chemical species are excited in the fluid in alignment with the light guide axis. Optical emissions are received from the excited chemical species along such axis. 18 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {2}
}