&lt;title&gt;In-situ tunable laser fluorescence analysis of hydrocarbons&lt;/title&gt;

Gillispie, Gregory D.; Germain, Randy W. St.

doi:10.1117/12.59338

SPIE Proceedings

1992

DOI: 10.1117/12.59338

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<title>In-situ tunable laser fluorescence analysis of hydrocarbons</title>

Gregory D. Gillispie

Randy W. St. Germain

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Cited by 6 publications

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“…Recently, truck-mounted cone penetrometers have been developed for on-site environmental measurements. , With a cone penetrometer, a fiber-optic probe can be pushed into the ground for subsurface contamination monitoring. Over the last five years or so, laser-induced fluorescence via fiber-optic probe installed in a cone penetrometer has been employed for in situ monitoring of subsurface contaminants. − Such contaminants include petroleum, oil, and lubricants (POL), polycyclic aromatic hydrocarbons (PAH), and other fluorescent substances.…”

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confidence: 99%

Improved Two-Fiber Probe for in Situ Spectroscopic Measurement

1996

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A simple two-fiber probe has been modified and improved for in situ spectroscopic measurements that utilize frontsurface geometry. The efficiency of the probe for fluorescence measurement across a window is improved by maximizing the overlap of the light cones of the two fibers at the outside surface of the window where the sample is in contact with the window. This is achieved by polishing the ends of the fibers at predetermined angles and using different probe geometries. Improvement factors up to 14 have been obtained for fluorescence of phenol in distilled water, anthracene in 75% methanol, and the solutions mixed with sands and clay. The improved twofiber probe can be used for fluorescence as well as phosphorescence, Raman, and infrared (reflectance) spectroscopic measurements.

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Improved Two-Fiber Probe for in Situ Spectroscopic Measurement

1996

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“…Optical fibers have been widely used in many areas of spectroscopic measurement, including fluorescence, − phosphorescence, , Raman, , near-infrared (NIR), IR, and laser-induced breakdown spectroscopies, just to name a few examples. Recently, various fiber-optic probes have been incorporated into cone penetrometer testing (CPT) rigs for in situ laser-induced fluorescence (LIF) measurements. ,− This is usually achieved by installing the fiber probe adjacent to a window on the side of the CPT rod near the cone tip and advancing the probe into the ground to monitor subsurface contaminants, mainly polycyclic aromatic hydrocarbons (PAHs), petroleum, oil, and lubricants (POL). , …”

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Two-Fiber Spectroscopic Probe with Improved Scattered Light Rejection

1999

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Our angled two-fiber probe design for in situ spectroscopic measurements (e.g., fluorescence, phosphorescence, or Raman) through a sapphire window has been modified to provide improved rejection of scattered excitation light while maintaining good efficiency of collection of the desired signal. The improvement is achieved by changing the probe axis to an off-normal configuration to minimize back reflection from window surfaces while maximizing the overlap of the light cones of the excitation and collection fibers at the outer window surface where the sample is in contact with the window. The results of laser-induced fluorescence measurements on phenol solution and sand samples, demonstrating the improved performance of the new probe, are reported. Up to 90-fold improvement in the fluorescence/scattered light ratio has been observed with the new probe.

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Zeitaufgelöste Fluorometrie in der Wasseranalytik

Resch¹,

Rurack²,

Senoner³

1994

Nachr. Chem. Tech. Lab.

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Verfahren der chemischen Analyfik werrere Fluoreszenzabklingzeiten und die dazuden heufe vor allem unfer Iwei Gegehorigen Amplituden bestimmt werden. sichfspunkten enfwickelf .-Extrem hohe rungen erschwert . Durch die Messung der Fluoreszenz nach einer definierten Verzogerung (Abbildung 2) konnte in einem Gemisch Nachweisempfindlichkeit und schnelle, F(t) = Z a, exp -(tlt,) kosfengunstige I Vor-Orf-Analyfik: Zu beiden Bereichen kann die zeifaufgeloa, -Amplituden sfe Fluorometrie einen Beifrag leisfen. t, -Abklingzeiten (1) t = tan +I2 x Y t -Abklingzeit Nachr. Chem. Tech. Lab. 42 (1994) Nr. 5 0341-5163/94/0505-0504 $5.00 + .25/0 0 VCH Verlagsgesellschaft mbH, D-69451 Weinheim, 1994

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<title>In-situ tunable laser fluorescence analysis of hydrocarbons</title>

Cited by 6 publications

References 0 publications

Improved Two-Fiber Probe for in Situ Spectroscopic Measurement

Improved Two-Fiber Probe for in Situ Spectroscopic Measurement

Two-Fiber Spectroscopic Probe with Improved Scattered Light Rejection

Zeitaufgelöste Fluorometrie in der Wasseranalytik

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