scholarly journals Identification and Quantification of Explosives in Nanolitre Solution Volumes by Raman Spectroscopy in Suspended Core Optical Fibers

Sensors ◽  
2013 ◽  
Vol 13 (10) ◽  
pp. 13163-13177 ◽  
Author(s):  
Georgios Tsiminis ◽  
Fenghong Chu ◽  
Stephen Warren-Smith ◽  
Nigel Spooner ◽  
Tanya Monro
Keyword(s):  
Raman Spectroscopy ◽  
Optical Fibers ◽  
Identification And Quantification

Liquid Core Optical Fibers in Raman Spectroscopy

1981 ◽  
Vol 35 (4) ◽  
pp. 439-442 ◽  
Author(s):  
Howard B. Ross ◽  
William M. McClain
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Optical Fibers ◽  
Liquid Core ◽  
Geometrical Optics ◽  
Laser Spectrometer ◽  
Trans Stilbene ◽  
Scan Speed ◽  
Good Agreement

Raman spectra of samples contained in hollow quartz fibers are compared quantitatively to conventional Raman spectra using identical laser, spectrometer, detector, and scan speed. We find the fiber signal to be enhanced by a factor of 250/m of fiber, in good agreement with calculations based on geometrical optics. A fiber spectrum of 2 mol% trans-stilbene in benzene is good enough to allow essentially perfect solvent subtraction.

Inverse spatially‐offset Raman spectroscopy using optical fibers: An axicon lens‐free approach

2019 ◽  
Vol 12 (11) ◽  
Author(s):  
Khan Mohd. Khan ◽  
Surjendu B. Dutta ◽  
Nitin Kumar ◽  
Anita Dalal ◽  
Amrita Srivastava ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Optical Fibers

Identification and quantification of β-caryophyllene in copaiba oil using Raman spectroscopy

2017 ◽  
Vol 46 (3) ◽  
pp. 265-276 ◽  
Author(s):  
José Aparecido Boaroto ◽  
Adriana Barrinha Fernandes ◽  
Leonardo Marmo Moreira ◽  
Landulfo Silveira ◽  
Carlos José de Lima
Keyword(s):  
Raman Spectroscopy ◽  
Copaiba Oil ◽  
Identification And Quantification

Raman Spectral Characterization of Pure and Doped Fused Silica Optical Fibers

1975 ◽  
Vol 29 (4) ◽  
pp. 337-344 ◽  
Author(s):  
G. E. Walrafen ◽  
J. Stone
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Optical Fibers ◽  
Fused Silica ◽  
Laser Raman ◽  
Laser Raman Spectra ◽  
Raman Spectral ◽  
Oh Content ◽  
Absorption Measurements

The utility of Raman spectroscopy as a means of characterizing the properties of pure and doped fused silica has been investigated. Laser-Raman spectra were obtained by forward scattering from solid optical fibers ∼35 to 85 m in length using 514.5 nm excitation with an “image slicer” and a Cary model 81 instrument. Clad and unclad fibers of fused silica and doped fibers having SiO2-GeO2 and SiO2-GeO2-B2O3 cores were examined. Raman spectra were also obtained from bulk samples of glasses, including pure GeO2, pure B2O3, and various compositions of SiO2-GeO2, SiO2-B2O3, and SiO2-GeO2-B2O3. The addition of dopants to fused silica was found to alter the Raman spectrum both by the appearance of new bands, roughly proportional to dopant concentration and not common either to the fused silica or to the dopant alone, and by the marked alteration of other Raman bands, which is indicative of changes in the local intermolecular order. Thus, addition of GeO2 produces new Raman bands at ∼675 and ∼1000 cm−1; and of B2O3, new bands at ∼940 and ∼1350 cm−1. Addition of GeO2 and/or B2O3 weakens the relatively sharp Raman lines near 485 and 600 cm−1 (and a similar but small effect was also noted with increasing OH content). GeO2 and B2O3 together also produce observable narrowing of the broad intense 440 cm−1 Raman contour. These spectral effects are interpreted, respectively, in terms of a decrease in the concentrations of [Formula: see text] and [Formula: see text] defects produced by dopant addition and of a concomitant reordering of the silica structure. Raman spectroscopy thus appears to be a useful optical technique for elucidating the properties of dopants that have been especially chosen for good optical transmission and hence are not easily detectable by absorption measurements.

Raman Spectroscopy over Optical Fibers with the Use of a Near-IR FT Spectrometer

1988 ◽  
Vol 42 (8) ◽  
pp. 1558-1563 ◽  
Author(s):  
D. D. Archibald ◽  
L. T. Lin ◽  
D. E. Honigs
Keyword(s):  
Raman Spectroscopy ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Scattered Light ◽  
Background Spectrum ◽  
Excitation Light ◽  
Analyte Signal ◽  
Near Ir ◽  
Potential Applications ◽  
Ft Ir

A commercial Fourier transform infrared (FT-IR) spectrometer was modified for remote near-IR Raman spectroscopy. In one configuration, a single optical fiber was used to guide the excitation light to the specimen and to collect scattered light from the specimen. In an alternative configuration, separate fibers were used for excitation and collection. The optical fiber probes were used to record the Raman spectra of both liquid and solid specimens. The Raman scattering of the optical fibers interfered with the analyte signal. This fiber interference was affected by the optical properties of the specimen and the optical sampling configuration. These interferences were partially removed by subtracting a background spectrum. Potential applications and improvements are discussed.

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