Fiber-optic laser-induced fluorescence probe for the detection of environmental pollutants

Bublitz, J.; Dickenhausen, M.; Grätz, Matthias; Todt, S.; Schade, Wolfgang

doi:10.1364/ao.34.003223

Cited by 38 publications

(17 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The spectral attenuation coefficients for this fiber type are given by the manufacturer as 0.944 m -1 for the wavelength 355 nm and 0.794 m -1 for λ = 246 nm, respectively. The details of the laser probe are described elsewhere [4]. For time-resolved recording of the LIF-intensities a gated optical multichannel analyzer (OMA-4-system, EG&G Princeton Applied Research) with a time-resolution of 5 ns is applied.…”

Section: Methodsmentioning

confidence: 99%

“…Fiber-optic sensors and laser-induced fluorescence (LIF) spectroscopy have drawn considerable interest in remote sensing of various environmental pollutants in air, water and soil [1][2][3][4]. In this context, time-integrated detection of LIF-intensities seems to be a very attractive procedure for screening applications since the ratios of "late" and "early" fluorescence intensities depend sensitively on the concentration of oil in a polluted water or soil sample [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…In this context, time-integrated detection of LIF-intensities seems to be a very attractive procedure for screening applications since the ratios of "late" and "early" fluorescence intensities depend sensitively on the concentration of oil in a polluted water or soil sample [4,5]. A computer simulation is developed to describe the dependence of the temporal evolution of oil-water LIF-spectra on the concentration of oil in the sample under investigation [4].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Bublitz

Christophersen

Schade

1996

Analytical and Bioanalytical Chemistry

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Bublitz

Christophersen

Schade

1996

Analytical and Bioanalytical Chemistry

Self Cite

View full text Add to dashboard Cite

show abstract

“…For volatile compounds and polycyclic aromatic hydrocarbons, sub-nanosecond excitation in the middle ultraviolet spectrum (200-300 nm) is required. Time-resolved laboratory and process-control systems are available (e.g., Bublitz et al, 1995), and a submersible time-resolved fluorescence decay sensor, combined with a hyperspectral fluorometer, is currently under development (Rohde et al, 2009). …”

Section: Time Resolved Fluorescencementioning

confidence: 99%

Optical tools for ocean monitoring and research

et al. 2009

View full text Add to dashboard Cite

Abstract. Requirements for understanding the relationships between ocean color and suspended and dissolved materials within the water column, and a rapidly emerging photonics and materials technology base for performing optical based analytical techniques have generated a diverse offering of commercial sensors and research prototypes that perform optical measurements in water. Through inversion, these tools are now being used to determine a diverse set of related biogeochemical and physical parameters. Techniques engaged include measurement of the solar radiance distribution, absorption, scattering, stimulated fluorescence, flow cytometry, and various spectroscopy methods. Selective membranes and other techniques for material isolation further enhance specificity, leading to sensors for measurement of dissolved oxygen, methane, carbon dioxide, common nutrients and a variety of other parameters. Scientists are using these measurements to infer information related to an increasing set of parameters and wide range of applications over relevant scales in space and time.

show abstract

“…For determination of chemical species or elements in water, there are various techniques such as atomic absorption spectroscopy (AAP), inductively coupled plasma optical emission spectroscopy (ICP-OES), laser induced breakdown spectroscopy (LIBS), fiber optic evanescent wave spectroscopy (FEWS), laser induced fluorescence spectroscopy (LIFS), etc. [2][3][4][5][6]. Detection of trace elements was studied by using several aforementioned techniques but FLRD technique was utilized the first time with bare single mode fiber without any additional treatment such as coating the sensor head, or any additional optical devices such as optical spectrum analyzer.…”

Section: Introductionmentioning

confidence: 99%

Detection of trace elements in DI water and comparison of several water solutions by using EF-FLRD chemical sensors

Kaya

Wang

2017

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. Detection of trace elements in DI water and comparison of several types of water respons such as DI water, tap water, and ocean water were studied by using EF-FLRD chemical sensors. Solutions of Mg, Fe, P, and Cd elements with a concentration of 1000 μg/ml (1 mg/ml) which corresponds to 1000 ppm by weight were tested. DI water, tap water, and real ocean water were utilized as medium to observe refractive index difference of solutions. The EF sensing technique which is based on the EF scattering effect was employed for the detection of trace chemicals and recording of solution responses. Due to the refractive index differences between solutions, optical loss of the sensor was different when the sensor head was immersed into solutions of approximately 10 ml each. The differences of the refractive indices are presented by recording ringdown times when the sensor head was immersed into the solutions. Fast response (~1s), high sensitive, and reproducible EF-FLRD chemical sensors were fabricated and tested in laboratory conditions. High sensitivity of the sensors due to being capability of detecting smaller differences between measurands without any additional components or treatment makes the EF-FLRD sensors more attractive. Enhanced sensitivity of the EF-FLRD chemical sensors as a result of the multi-pass nature of the FLRD technique has potential application in detecting of trace elements in monitoring of water quality.

show abstract

Fiber-optic laser-induced fluorescence probe for the detection of environmental pollutants

Cited by 38 publications

References 9 publications

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

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

Optical tools for ocean monitoring and research

Detection of trace elements in DI water and comparison of several water solutions by using EF-FLRD chemical sensors

Contact Info

Product

Resources

About