&lt;title&gt;Fiber optic fluorometer based on a dual-wavelength laser excitation source&lt;/title&gt;

Theriault, Gregory A.; Newbery, Ricardo; Andrews, Jonathan R.; Apitz, Sabine E.; Lieberman, Stephen H.

doi:10.1117/12.143503

Cited by 11 publications

(8 citation statements)

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“…Because the photodiode array detector is time gated, it is possible to increment the delay of the detector gate for successive laser pulses in order to determine fluorescence decay times. 8,11 This capability, however, has not been implemented in the operational system. .)…”

Section: Scaps Systemmentioning

confidence: 95%

Direct-push, fluorescence-based sensor systems forin situ measurement of petroleum hydrocarbons in soils

Lieberman¹

1998

Field Analyt. Chem. Technol.

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Section: Scaps Systemmentioning

confidence: 95%

Direct-push, fluorescence-based sensor systems forin situ measurement of petroleum hydrocarbons in soils

Lieberman¹

1998

Field Analyt. Chem. Technol.

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“…In this context, Theriault et al (22) applied the third (355 nm) and fourth (266 nm) harmonics of a Nd:YAG laser for LIF excitation in pyrene-fluoranthene mixtures to separate these two aromatics. For a first approach, in the present investigation the third harmonic of a Nd:YAG laser (GCR150, Spectra Physics) at 355 nm and a hydrogen Raman shifter are applied to generate multiwavelength laser radiation at 246, 276, 309, and 355 nm, respectively.…”

Section: Discrimination Of Btxe and Pahs By Multiwavelength Laser Excmentioning

confidence: 99%

“…Also the transmission properties of silica fibers, like spectral attenuation, fiber fluorescence, and color center formation have to be considered when excitation wavelengths shorter than 300 nm are used (22)(23)(24)(25)(26). Contrary to the Nd:YAG laser system, a KrF excimer laser and a hydrogen Raman shifter will allow the generation of laser radiation at 248, 276, and 317 nm with repetition rates of up to 100 Hz.…”

Section: Discrimination Of Btxe and Pahs By Multiwavelength Laser Excmentioning

confidence: 99%

On-Site Laser Probe for the Detection of Petroleum Products in Water and Soil

Schade

Bublitz

1996

Environ. Sci. Technol.

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Time-resolved laser-induced fluorescence spectroscopy and fiber optics are shown to be promising tools for the detection of environmental pollutants in water and soil. Time-integrated data accumulation of fluorescence intensities in an "early" and in a "late" time window with respect to the excitation pulse simplifies the method in such a way that it becomes very attractive for practical applications. Results from field measurements are reported while on-line oil concentrations in an industrial oil separator are monitored for process control. For UV laser excitation at 337 nm and recording LIF signals at 400 nm, typical detection limits of the present setup are 0.5 mg of engine oil/L in water and 5 mg of engine oil/kg in soil. The selectivity of the method can be improved significantly when a multiwavelength laser excitation in the ultraviolet spectral range between 240 and 360 nm is applied. Thus, a separation between different classes of aromatic components in petroleum products is possible.

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“…Since petroleum products are complicated mixtures of mono-and polycyclic aromatic hydrocarbons (PAHs) the excitation by ultraviolet (uv) laser pulses of different wavelengths change the intensity and the decay characteristics of the LIF significantly [8]. Therefore, e.g.…”

Section: Introductionmentioning

confidence: 99%

Laser-based detection of PAHs and BTXE-aromatics in oil polluted soil samples

Bublitz

Christophersen

Schade

1996

Analytical and Bioanalytical Chemistry

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Time-resolved laser-induced fluorescence spectroscopy and fiber optics are applied for the detection of aromatic hydrocarbons in oil contaminated water and soil samples. Time-integrated data accumulation of fluorescence intensities in an "early" and in a "late" time window with respect to the exciting laser pulse simplifies the method in such a way that it becomes very attractive for practical applications. For ultraviolet laser excitation at 337 nm and recording fluorescence signals at 400 nm, typical detection limits of the present set-up are 0.5 mg engine oil/L in water and 5 mg engine oil/kg in soil. A discrimination between BTXE-aromatics and PAHs in oil polluted soil or water samples is possible, when more than one laser wavelength in the ultraviolet is used for the excitation. The possibilities for a thermal discrimination between different aromatics are also discussed.

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<title>Fiber optic fluorometer based on a dual-wavelength laser excitation source</title>

Cited by 11 publications

References 0 publications

Direct-push, fluorescence-based sensor systems forin situ measurement of petroleum hydrocarbons in soils

Direct-push, fluorescence-based sensor systems forin situ measurement of petroleum hydrocarbons in soils

On-Site Laser Probe for the Detection of Petroleum Products in Water and Soil

Laser-based detection of PAHs and BTXE-aromatics in oil polluted soil samples

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