Recent development of a new handheld UV Raman sensor for standoff detection

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

doi:10.1117/12.2587656

Cited by 5 publications

(7 citation statements)

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“…The goal is to get a short enough wavelength to be operating in the fluorescence free region but also not too short of a wavelength where optical coatings and laser line rejection filters are difficult to readily source. Since size and weight are critical for an extremely lightweight application, a custom Diode Pumped Solid State (DPSS) laser was developed by ADS 6 . The output laser beam is expanded and collimated with custom optics and transmitted out of the system.…”

Section: Argos Descriptionmentioning

confidence: 99%

“…This manuscript focuses on the new smaller & lighter standoff trace detection system called Argos. Argos leverages many of the developments of the economical bulk and residue standoff detection sensor called Situational Awareness for First Responders (SAFR) 6 . Argos is the higher performance version which replaces a scientific grade CCD with an Intensified CCD (ICCD) for ~500x more signal.…”

Section: Introductionmentioning

confidence: 99%

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Development of a one-handed UV Raman sensor for standoff trace detection

Waterbury

Conghuyentonnu

Hardy

et al. 2023

Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIV

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Alakai Defense Systems has recently developed what we believe is the first one-handed UV Raman sensor for standoff trace detection of chemicals, which we refer to as Argos. Argos is the higher performance version of lower cost SAFR sensor, since it has increased range and trace detection capability. Since it is lightweight, Argos can also be deployed on Unmanned Ground Vehicles (UGV’s) or Unmanned Aerial Vehicles (UAVs). Data is presented showing how Argos detection performance is essentially the same as Alakai’s proven trace detection sensor PRIED, however it is ~70% smaller and lighter.

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Section: Argos Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a one-handed UV Raman sensor for standoff trace detection

Waterbury

Conghuyentonnu

Hardy

et al. 2023

Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIV

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show abstract

“…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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“…In an international perspective, there are currently lots of research activities concerning explosive hazards detection, and stand-off detection of explosives is in main focus [1,2]. The reason for this interest is the occurrence of terrorist attacks on the civilian society involving improvised explosives devices IED [3][4][5]. Laser-based spectroscopies are the only currently viable techniques that can be utilized to sense trace amounts of explosives at stand-off distances.…”

Section: Introductionmentioning

confidence: 99%

“…Laser-based spectroscopies are the only currently viable techniques that can be utilized to sense trace amounts of explosives at stand-off distances. In particular, Raman spectroscopy has been shown to be effective for stand-off detection and has the ability to both detect and identify explosive materials [4,6]. Raman spectroscopy is virtually instantaneous, non-destructive in nature and provides high selectivity.…”

Section: Introductionmentioning

confidence: 99%