Development of a family of new handheld UV raman sensors for standoff detection

Waterbury, Robert D.; Conghuyentonnu, Thuyan; Hardy, Hunter; Molner, Timothy; Robins, Ryan; Scott, Marshall

doi:10.1117/12.2618641

Cited by 2 publications

(1 citation statement)

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“…12 Dispersive 1064 nm excitation portable instruments are commercially available. Progress is being made toward the development of handheld deep-UV excitation Raman instruments, 13,14 and some examples of street drug Raman spectra, acquired with both visible-and UV-excitation have recently been published. 15 In time-gating, fluorescence avoidance relies upon Raman scattering being instantaneous and fluorescence being delayed, depending on the fluorescence lifetime, from 200 ps to microseconds (or longer in the case of phosphorescence).…”

Section: Introductionmentioning

confidence: 99%

LEGO Blocks as “Standard” Samples for Evaluation of Fluorescence Avoidance and Mitigation in Raman Spectroscopy

Crocombe,

Kammrath,

Leary

et al. 2024

Appl Spectrosc

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Fluorescence interference in Raman spectroscopy is a well-known problem and is especially significant in portable instruments where the availability of a variety of exciting wavelengths is unlikely. Several fluorescence avoidance and mitigation schemes are described in the literature, and implemented by Raman spectrometer manufacturers, but there is no standard method for evaluating the accuracy and repeatability of these schemes. Some test samples shown in instrument descriptions, such as “dark rum” and “sesame seed oil” are not reproducible. Therefore, we propose a set of colored LEGO blocks as “standard” samples for this purpose; they have the attractive properties of being very low cost, rugged, non-toxic, easy to transport and store, and appear to be manufactured using a standard process. This paper shows the Raman spectra of a set of these blocks at different excitation wavelengths, acquired on laboratory instruments, along with their visible–near-infrared spectra. The goal is to qualitatively understand the origins of the observed fluorescence and lay the groundwork for exploring the effectiveness of methods currently implemented on handheld Raman instruments.

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Section: Introductionmentioning

confidence: 99%

LEGO Blocks as “Standard” Samples for Evaluation of Fluorescence Avoidance and Mitigation in Raman Spectroscopy

Crocombe,

Kammrath,

Leary

et al. 2024

Appl Spectrosc

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Portable Raman Spectrometers: How Small Can They Get?

Crocombe¹,

Kammrath

Leary

2023

Spectroscopy

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Portable Raman spectrometers have become smaller over the last 20 years, while their performance has increased. This has been made possible by closer coupling of all the components, use of transmission gratings rather than reflection gratings, and general advances in electronics, displays, and battery technologies. An obvious question to ask is whether this trend can continue. This paper describes the technologies and evolution of these instruments, existing limitations, the current landscape of miniature Raman spectrometers, and the state of the art. Finally, the paper also looks at what emerging technologies could be applied in this area, and how those could lead to new applications

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Development of a family of new handheld UV raman sensors for standoff detection

Cited by 2 publications

References 0 publications

LEGO Blocks as “Standard” Samples for Evaluation of Fluorescence Avoidance and Mitigation in Raman Spectroscopy

LEGO Blocks as “Standard” Samples for Evaluation of Fluorescence Avoidance and Mitigation in Raman Spectroscopy

Portable Raman Spectrometers: How Small Can They Get?

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