Quantitative millimetre wave spectrometry. Part I: Design and implementation of a tracked millimetre wave confocal Fabry-Perot cavity spectrometer for gas analysis

Rezgui, Nacer Ddine; Allen, John T.; Baker, J. G.; Alder, John F.

doi:10.1016/0003-2670(95)00175-y

Cited by 10 publications

(3 citation statements)

References 7 publications

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“…This power is then amplified to y20 mW in a W-band transistor power amplifier (Spacek-SPW-15-10) and tripled in a diode multiplier (Virginia Diodes-TWR3) to produce y0.5 mW between 246.8-261.2 GHz. Although 0.5 mW might seem like not a lot of power, this source is enormously bright(y10 14 K) 68 and must be significantly attenuated not to saturate an InSb detector cooled to liquid 4 He temperature or to produce excess 1/f noise in room temperature Schottky diode detectors.…”

Section: Optimization Of the System Architecture For Analytical Appli...mentioning

confidence: 99%

“…2 More recently, it has been noted in this journal that technological advances should make the microwave spectral region 'ripe' for exploitation for analytical purposes, 3 but overall system complexity and speed have persisted as limitations. 4,5 In parallel, microwave spectroscopy at shorter wavelengths, often referred to as 'submillimetre' spectroscopy, developed into a robust field. Its earliest applications were in the establishment of the rotational spectroscopic properties of small fundamental species as well as their collisional and dynamical properties.…”

Section: Introductionmentioning

confidence: 99%

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Chemical analysis in the submillimetre spectral region with a compact solid state system

Medvedev

Behnke

Lucia

2006

Analyst

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A new analytical system that uses the rotational signatures of gas phase molecules is described and demonstrated. It uses a solid state source to probe molecular systems in the millimetre and submillimetre wave range, the only region of the electromagnetic spectrum not yet used extensively for analytical purposes. It employs the FAst Scan Submillimetre Spectroscopy Technique (FASSST), which leads to an especially simple system architecture. Among the attributes of the system are generality, sensitivity, 'absolute' specificity, small size, simplicity, and the potential for very low cost. Applications to problems of analytical interest are also discussed.

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Section: Optimization Of the System Architecture For Analytical Appli...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical analysis in the submillimetre spectral region with a compact solid state system

Medvedev

Behnke

Lucia

2006

Analyst

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show abstract

“…2 More recently microwave based techniques have been investigated which have distinct advantages over more conventional methods. [3][4][5][6][7][8][9][10][11][12] Microwave technology is robust. Highly stable solid state devices are commercially available that operate from 1-18 GHz.…”

Section: Introductionmentioning

confidence: 99%

Chirped-Pulse Fourier Transform Microwave Spectroscopy: A New Technique for Rapid Identification of Chemical Agents

Pajski

LOGAN

Douglass

et al. 2008

Int. J. Hi. Spe. Ele. Syst.

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We have developed a new broadband Chirped-Pulse Fourier Transform Microwave (CP-FTMW) spectrometer that allows the microwave spectrum in the 7.5-18.5 GHz range to be measured in a single data event. This technique produces a pure rotational spectrum that can be used for unambiguous identification of any species having a permanent electric dipole moment. CP-FTMW is a gas phase technique that is ideally suited for the detection of airborne chemical warfare agents (CWA) which must be detected in trace amounts (< 10 ppm in air). The high resolution of the technique allows the identification of complex mixtures without the need for a preliminary separation step, such as gas chromatography, which significantly reduces analysis time. The technique is "blind" to major atmospheric components (N 2 , O 2 , CO 2 , H 2 O) as they either do not posses a permanent dipole moment or do not absorb in the range of the spectrometer, thereby eliminating large background signals. In this paper we will present preliminary results that are focused on early detection of airborne CWA, including acquisition time, sensitivity limits, and sample handling requirements for several of these species.

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Quantitative millimetre wave spectroscopy. part II: Determination of working conditions in an open Fabry-Perot cavity

Rezgui

Baker

Alder

1995

Analytica Chimica Acta

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Quantitative millimetre wave spectrometry. Part I: Design and implementation of a tracked millimetre wave confocal Fabry-Perot cavity spectrometer for gas analysis

Cited by 10 publications

References 7 publications

Chemical analysis in the submillimetre spectral region with a compact solid state system

Chemical analysis in the submillimetre spectral region with a compact solid state system

Chirped-Pulse Fourier Transform Microwave Spectroscopy: A New Technique for Rapid Identification of Chemical Agents

Quantitative millimetre wave spectroscopy. part II: Determination of working conditions in an open Fabry-Perot cavity

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