The characteristics and capabilities of two laboratory versions of a fluorosensor system built around N2 and KrF lasers are compared. Both systems were tested to determine the feasibility of remotely detecting the fluorescent emission of organic effluents associated with coal processing. System performance was measured under daylight and nighttime conditions for both actual effluents and known reference solutions and is predicted for an airborne system. Experiments on a multichannel system are also described.
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Defined in the usual Beer’s law context as the product of concentration c, extinction coefficient ɛ, and sample thickness X; the sample thickness (in absorbance determinations) was 1.0 cm and the wavelength was 250 nm in all cases.
Measured with N2 laser excitation (337 nm).
Photons emitted per photon absorbed, integrated over emission band, for excitation at 250 nm.
Obtained from J. T. Baker Chemical Co., Phillipsburg, New Jersey 08805.
Obtained from the National Bureau of Standards, Washington, D.C. 20234.
Obtained from Battelle Pacific Northwest Laboratories, Richland, Washington 99352.
Obtained from the Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830.
Table II
Assay of the NBS Aqueous Solution of PAH Substances
Compound
Gravimetric concentration (ppm)
Phenol
21.0
Para-cresol
54.3
Ortho-cresol
34.3
2-naphthol
71.4
2,4,6-trimethylphenol
38.8
Table III
Summary of Fluorescence Signal Voltages from Various Residue and Background Samples Using both Daylight and Nighttime Filter Sets and 337-nm Excitation
Unanalyzed solid granulate and powder residues from a coal gasification facility and an oil shale processing plant.
Weathered surface.
Below system sensitivity limit.
One drop of SAE 30 motor oil on water.
Table IV
Relative Fluorescence Emission of Background Materials and Solid Pollutant Samples Excited at 249 nm
Liquid samples were 1 cm deep in Petri dishes.
Granular residue from an in situ coal gasification facility; particle sizes ranging up to ~5 mm in diameter.
A fine powder residue from an oil shale processing facility.
A coarse residue from an oil shale processing facility containing lumps to about 1 cm in diameter.
Defined in the usual Beer’s law context as the product of concentration c, extinction coefficient ɛ, and sample thickness X; the sample thickness (in absorbance determinations) was 1.0 cm and the wavelength was 250 nm in all cases.
Measured with N2 laser excitation (337 nm).
Photons emitted per photon absorbed, integrated over emission band, for excitation at 250 nm.
Obtained from J. T. Baker Chemical Co., Phillipsburg, New Jersey 08805.
Obtained from the National Bureau of Standards, Washington, D.C. 20234.
Obtained from Battelle Pacific Northwest Laboratories, Richland, Washington 99352.
Obtained from the Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830.
Table II
Assay of the NBS Aqueous Solution of PAH Substances
Compound
Gravimetric concentration (ppm)
Phenol
21.0
Para-cresol
54.3
Ortho-cresol
34.3
2-naphthol
71.4
2,4,6-trimethylphenol
38.8
Table III
Summary of Fluorescence Signal Voltages from Various Residue and Background Samples Using both Daylight and Nighttime Filter Sets and 337-nm Excitation
Unanalyzed solid granulate and powder residues from a coal gasification facility and an oil shale processing plant.
Weathered surface.
Below system sensitivity limit.
One drop of SAE 30 motor oil on water.
Table IV
Relative Fluorescence Emission of Background Materials and Solid Pollutant Samples Excited at 249 nm
Liquid samples were 1 cm deep in Petri dishes.
Granular residue from an in situ coal gasification facility; particle sizes ranging up to ~5 mm in diameter.
A fine powder residue from an oil shale processing facility.
A coarse residue from an oil shale processing facility containing lumps to about 1 cm in diameter.