Fiber optics spectrochemical emission sensors
Abstract
A method 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 uses a probe insertable into the well or tank via a cable and having 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 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 the fluid in alignment with the light guide axismore »
- Inventors:
-
- Kennewick, WA
- West Richland, WA
- Issue Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- OSTI Identifier:
- 868155
- Patent Number(s):
- 5085499
- Assignee:
- Battelle Memorial Institute (Richland, WA)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- DOE Contract Number:
- AC06-76RL01830
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- fiber; optics; spectrochemical; emission; sensors; method; situ; monitoring; fluid; stored; tank; groundwater; vadose; zone; gases; presence; selected; chemical; species; probe; insertable; via; cable; electrical; apparatus; exciting; pair; electrodes; initiating; spark; plasma; cell; maintaining; excite; optical; receiving; emissions; emitted; excited; optically; transmitting; analysis; location; outside; detecting; wavelength; indicative; plurality; probes; suspended; respective; analyzing; steps; synchronized; sequentially; set; support; equipment; instrumentation; monitor; multiple; arranged; light; guide; axis; alignment; received; plasma cell; excited species; selected wavelength; optical apparatus; fiber optics; optical emissions; fiber optic; chemical species; light guide; chemical specie; electrical apparatus; selected chemical; receiving optical; vadose zone; tank via; optical emission; analysis location; selected wave; optically transmitting; fluid stored; situ monitoring; /356/
Citation Formats
Griffin, Jeffrey W, and Olsen, Khris B. Fiber optics spectrochemical emission sensors. United States: N. p., 1992.
Web.
Griffin, Jeffrey W, & Olsen, Khris B. Fiber optics spectrochemical emission sensors. United States.
Griffin, Jeffrey W, and Olsen, Khris B. Wed .
"Fiber optics spectrochemical emission sensors". United States. https://www.osti.gov/servlets/purl/868155.
@article{osti_868155,
title = {Fiber optics spectrochemical emission sensors},
author = {Griffin, Jeffrey W and Olsen, Khris B},
abstractNote = {A method 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 uses a probe insertable into the well or tank via a cable and having 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 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 the fluid in alignment with the light guide axis and optical emissions are received from the excited chemical species along such axis.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1992},
month = {Wed Jan 01 00:00:00 EST 1992}
}
Works referenced in this record:
A new He discharge-afterglow and its application as a gas chromatographic detector
journal, January 1985
- Rice, G. W.; D'Silva, A. P.; Fassel, V. A.
- Spectrochimica Acta Part B: Atomic Spectroscopy, Vol. 40, Issue 10-12