Fiber-optic evanescent-field sensor device for CO 2 and explosive detection

Schade, Wolfgang; Orghici, Rozalia; Willer, Ulrike; Waldvogel, Siegfried R.

doi:10.1117/12.786017

Cited by 6 publications

(2 citation statements)

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“…8), also capable of explosive vapor detection, was built with 200-µm-core multimode fiber which may be as long as several meters for sensing, excitation and signal transmission purposes [53]. The middle segment of the fiber is decladded, coiled and coated with sensory materials based on triphenylene-ketals [54]. These receptors bind TNT molecules through charge transfer, causing attenuation of the transmitted light and a color change from transparent to red.…”

Section: Explosives Detection Using Long Fiber With Functionalized Claddingmentioning

confidence: 99%

Fiber-Optic Sensors for Explosives Detection

Ma¹

2013

TOOPTSJ

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As one of the most enduring hot topics, explosives detection commands world-wide interest among scientists across universities and research institutes. Abundant research achievements pertaining to this subject have been reported. Various choices of commercial and military-grade detection units are available for deployment. Yet, airport security and the continuing threat of improvised explosive devices (IEDs) demand more advanced solutions for the detection of trace explosive materials. Among the most valued are those capable of detecting trace explosive vapors in open air, which have also presented the most technically difficult challenges confronting researchers.This paper is devoted to the detection of trace vapor explosive materials using fiber-optic sensors and lab-on-a-fiber (LOF) devices. To offer readers an overall picture of the subject, recent technical progress is reviewed by covering all available techniques. The rapid evolution of laser-induced breakdown spectroscopy (LIBS) and Raman spectroscopy from benchtop instruments to field-deployable and portable units is emphasized as these techniques are widely used for detection of trace explosives and strongly related to fiber-optic sensing. The major part of this paper, however, will discuss our LOF devices coated with amplifying fluorescent polymer (AFP) films for the detection of trace vapor explosive materials. Various LOF devices employing low quantum yield (QY) AFPs will be described and evaluated. The crucial factors affecting the performance of LOF devices will be explored. On-line trace vapor pre-concentration and gas chromatography (GC) will be briefly discussed due to the indispensability of this approach for the fast and reliable on-line detection of trace vapor explosive materials.

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Section: Explosives Detection Using Long Fiber With Functionalized Claddingmentioning

confidence: 99%

Fiber-Optic Sensors for Explosives Detection

Ma¹

2013

TOOPTSJ

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“…2 strongly depends on the performance of the polymer sensory film for several reasons. First, since the film for the proposed LOF platform extends for only a very short distance, from one to several millimeters, signal accumulation through a long fiber segment [6], [7] is out of the question. A sufficiently high quantum yield is thus fundamental, and will also assist in reducing photo-bleaching of the polymer caused by high Ex power density.…”

Section: A Impact Of the Performance Of The Sensory Polymer Filmmentioning

confidence: 99%

TNT Vapor Detection Based on a Lab-on-a-Fiber: Achieving a Millimeter-Scale Sensing Element on Fiber

Kos

Bock

et al. 2012

IEEE Sensors J.

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In this paper, we discuss in detail the lab-on-a-fiber (LOF) concept that we proposed earlier (Ma et al., Proc. 4th Eur. Workshop Opt. Fiber Sens., 2010, vol. 7653, PP. 76531E-76531E-4), and present a specific example of this platform intended for trace vapor TNT detection. We show how we arrive at the current LOF design by examining the performance, technical difficulties, and complexities of various possible architectures. In the design solution adopted in our example, the sensing section occupies a space measuring only 1.6 1.6 0.8 mm, but contains several optical and chemical components/functions including a transmission/reflection mirror and TNT sensory film coated on a segment of the side wall of the fiber core. The fiber itself thus serves as the film substrate and when coated with the film becomes an evanescent-wave form fluorescent emission power collector. Its tiny dimensions notwithstanding, the LOF performs several simultaneous functions, including power density tuning and stray excitation light blocking. In addition, this LOF platform features ease of system construction and polymer film application. We demonstrate its fast response to TNT vapor, in the form of a 29% signal drop after 10 s of exposure.Index Terms-Fluorescence spectroscopy, optical fiber transducers, thin films, TNT explosive detection. are with the Centre de recherche en photonique, Département d'informatique et d'ingénierie,Université du Québec en Outaouais,

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Optical Fiber Sensors and Their Applications for Explosive Detection

Bock

2012

Photonic Sensing

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Fiber-optic evanescent-field sensor device for CO 2 and explosive detection

Cited by 6 publications

References 0 publications

Fiber-Optic Sensors for Explosives Detection

Fiber-Optic Sensors for Explosives Detection

TNT Vapor Detection Based on a Lab-on-a-Fiber: Achieving a Millimeter-Scale Sensing Element on Fiber

Optical Fiber Sensors and Their Applications for Explosive Detection

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