Advances in the Application of Array Detectors for Improved Chemical Analysis, Part I. Comparison of Qualitative Analyses Using Large, Computer-Based Raman Spectral Libraries

Denton, M. Bonner; Sperline, Roger P.; Giles, Jeffrey H.; Gilmore, D. A.; Pommier, Carolyn J. S.; Downs, Robert T.

doi:10.1071/ch02200

Cited by 11 publications

(9 citation statements)

References 3 publications

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“…We suppose that such selection should be preceded by careful analysis using a more abundant database. Such a database can be created by applying measurements from other devices after some necessary modifications [11]. Nevertheless, the results achieved for the database limited to ten spectra only can characterize the problem.…”

Section: Effectiveness Of Detection Algorithmsmentioning

confidence: 99%

Algorithms of Chemicals Detection Using Raman Spectra

Kwiatkowski¹,

Gnyba²,

Smulko³

et al. 2010

Metrology and Measurement Systems

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Raman spectrometers are devices which enable fast and non-contact identification of examined chemicals. These devices utilize the Raman phenomenon to identify unknown and often illicit chemicals (e.g. drugs, explosives) without the necessity of their preparation. Now, Raman devices can be portable and therefore can be more widely used to improve security at public places. Unfortunately, Raman spectra measurements is a challenge due to noise and interferences present outside the laboratories. The design of a portable Raman spectrometer developed at the Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology is presented. The paper outlines sources of interferences present in Raman spectra measurements and signal processing techniques required to reduce their influence (e.g. background removal, spectra smoothing). Finally, the selected algorithms for automated chemicals classification are presented. The algorithms compare the measured Raman spectra with a reference spectra library to identify the sample. Detection efficiency of these algorithms is discussed and directions of further research are outlined.

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Section: Effectiveness Of Detection Algorithmsmentioning

confidence: 99%

Algorithms of Chemicals Detection Using Raman Spectra

Kwiatkowski¹,

Gnyba²,

Smulko³

et al. 2010

Metrology and Measurement Systems

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“…The concept for CCDs was invented in 1969 by Willard Boyle and George Smith of Bell Laboratories (11). CCDs became commercially available in 1973 and are now found on spectrometers in teaching laboratories (12) and CCDs are one of the most commonly used detectors in many spectroscopic applications, including Raman spectroscopy (13,14). More detailed histories of CCD array detectors are presented by Sims (15) and Janesick (16).…”

Section: General Operationmentioning

confidence: 99%

The Impact of Array Detectors on Raman Spectroscopy

2007

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“…In addition, fluorescence off the sample or from the sample environment obscures the signal. More sensitive optical detectors and improved data processing algorithms are being developed to mitigate these issues [2][3][4][5]. As such, Raman spectroscopy is transitioning from purely lab-based applications to more challenging fieldbased applications, such as detection of emerging threat agents in realistic environmental settings.…”

Section: Introductionmentioning

confidence: 99%

Raman Spectroscopy for Homeland Security Applications

Mogilevsky

Borland

Brickhouse

et al. 2012

International Journal of Spectroscopy

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Raman spectroscopy is an analytical technique with vast applications in the homeland security and defense arenas. The Raman effect is defined by the inelastic interaction of the incident laser with the analyte molecule's vibrational modes, which can be exploited to detect and identify chemicals in various environments and for the detection of hazards in the field, at checkpoints, or in a forensic laboratory with no contact with the substance. A major source of error that overwhelms the Raman signal is fluorescence caused by the background and the sample matrix. Novel methods are being developed to enhance the Raman signal's sensitivity and to reduce the effects of fluorescence by altering how the hazard material interacts with its environment and the incident laser. Basic Raman techniques applicable to homeland security applications include conventional (off-resonance) Raman spectroscopy, surface-enhanced Raman spectroscopy (SERS), resonance Raman spectroscopy, and spatially or temporally offset Raman spectroscopy (SORS and TORS). Additional emerging Raman techniques, including remote Raman detection, Raman imaging, and Heterodyne imaging, are being developed to further enhance the Raman signal, mitigate fluorescence effects, and monitor hazards at a distance for use in homeland security and defense applications.

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Advances in the Application of Array Detectors for Improved Chemical Analysis, Part I. Comparison of Qualitative Analyses Using Large, Computer-Based Raman Spectral Libraries

Cited by 11 publications

References 3 publications

Algorithms of Chemicals Detection Using Raman Spectra

Algorithms of Chemicals Detection Using Raman Spectra

The Impact of Array Detectors on Raman Spectroscopy

Raman Spectroscopy for Homeland Security Applications

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