Application of mid-infrared cavity-ringdown spectroscopy to trace explosives vapor detection using a broadly tunable (6-8 μm) optical parametric oscillator

Todd, Michael; Provencal, R. A.; Owano, T. G.; Paldus, Barbara A.; Kachanov, and Alex A.; Vodopyanov, Konstantin L.; Hunter, Martin; Coy, Stephen L.; Steinfeld, J. I.; Arnold, James T.

doi:10.1007/s00340-002-0991-8

Cited by 132 publications

(67 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One interferogram is acquired in 0.5 s, and the subsequent fast Fourier transform (FFT) yields a spectrum containing 6000 spectral elements. For measurements of absorption spectra of C 2 H 2 , CH 4 , and N 2 O in nitrogen (N 2 ), the cavity is filled with the gas mixture to the desired pressure, and the analyte spectrum is recorded while constant flow of the gas through the cavity is maintained. After the analyte spectrum is taken, the cavity is evacuated and then refilled to the same pressure with pure N 2 , and a reference spectrum is recorded.…”

Section: Detection System and Signal Acquisitionmentioning

confidence: 99%

“…5 show the measured spectra (normalized to a reference spectrum) of several combination bands of C 2 H 2 (Fig. 5a), the 2ν 4 overtone band of CH 4 (Fig. 5b), and the 2ν 1 overtone band of N 2 O (Fig.…”

Section: Commercial Gas Standardsmentioning

confidence: 99%

“…The residuals of the fits using the full model are displayed in the bottom panels; for comparison residuals of fits when the detuning of all comb lines is set to zero are displayed in the middle panels neglects the non-zero detuning. In particular, the overshoots in the absorption lines, clearly visible at shorter wavelengths in the spectra of C 2 H 2 and CH 4 and at longer wavelengths in the spectrum of N 2 O, are real spectroscopic features and are modeled correctly. The structures remaining in the residuals can be attributed partly to incorrect spectral data in the database (e.g.…”

Section: Commercial Gas Standardsmentioning

confidence: 99%

“…It has been successfully applied to issues of fundamental scientific importance and serves as the backbone for numerous applications in physics, chemistry, and biology. These applications include control of manufacturing processes [1][2][3], detection of poisonous gasses or explosives [4,5], human breath analysis for medical applications [6][7][8][9], environmental monitoring [10][11][12][13], and optical methods of 14 C dating [14]. Laser spectroscopy also provides high-resolution and precision laboratory data essential for satellite remote sensing of planetary atmospheres and for monitoring of climate changes in the Earth's atmosphere [15].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cavity-enhanced optical frequency comb spectroscopy in the mid-infrared application to trace detection of hydrogen peroxide

et al. 2012

View full text Add to dashboard Cite

Cavity-enhanced optical frequency comb spectroscopy in the mid-infrared application to trace detection of hydrogen peroxide. Abstract We demonstrate the first cavity-enhanced optical frequency comb spectroscopy in the mid-infrared wavelength region and report the sensitive real-time trace detection of hydrogen peroxide in the presence of a large amount of water. The experimental apparatus is based on a midinfrared optical parametric oscillator synchronously pumped by a high-power Yb:fiber laser, a high-finesse broadband cavity, and a fast-scanning Fourier transform spectrometer with autobalancing detection. The comb spectrum with a bandwidth of 200 nm centered around 3.76 µm is simultaneously coupled to the cavity and both degrees of freedom of the comb, i.e. the repetition rate and carrier envelope offset frequency, are locked to the cavity to ensure stable transmission. The autobalancing detection scheme reduces the intensity noise by a factor of 300, and a sensitivity of 5.4 × 10 −9 cm −1 Hz −1/2 with a resolution of 800 MHz is achieved (corresponding to 6.9 × 10 −11 cm −1 Hz −1/2 per spectral element for 6000 resolved elements). This yields a noise equivalent detection limit for hydrogen peroxide of 8 parts-per-billion (ppb); in the presence of 2.8 % of water the detection limit is 130 ppb. Spectra of acetylene, methane, and nitrous oxide at atmospheric pressure are also presented, A. Foltynowicz ( ) · Applied physics. B, Lasers and optics (Print),

show abstract

Section: Detection System and Signal Acquisitionmentioning

confidence: 99%

Section: Commercial Gas Standardsmentioning

confidence: 99%

Section: Commercial Gas Standardsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cavity-enhanced optical frequency comb spectroscopy in the mid-infrared application to trace detection of hydrogen peroxide

et al. 2012

View full text Add to dashboard Cite

show abstract

“…91 Compact OPO system was also used for remote sensing explosives vapor detection at ppb level. 92 Other than conventional absorption spectroscopy, there are many new spectroscopic technologies developed, especially the frequency combs technique. 10,12 Mid-IR OPO shows great advantages in a new very sensitive absorption spectroscopy technique, called cavity-ring-down spectroscopy.…”

Section: Architecture Of Opomentioning

confidence: 99%

Developments of mid-infrared optical parametric oscillators for spectroscopic sensing: a review

Peng¹

2014

Opt. Eng

View full text Add to dashboard Cite

Abstract. Optical parametric oscillator is an attractive way of generating tunable mid-infrared light in the spectral range where lasers simply do not exist-for the needs of spectroscopy, medical applications, remote sensing, etc. We will go through the fundamentals of the optical parametric oscillator first and then introduce the related new phase-matching, cavity design, and spectroscopic techniques.

show abstract

Detection of Explosives using Pulsed Laser Fragmentation andMIRSpectroscopy

Mordmueller

Willer

Schade

2012

Encyclopedia of Analytical Chemistry

View full text Add to dashboard Cite

Within the past years, an increasing number of optical techniques for the detection of harmful substances has been investigated on account of the threat of terroristic attacks. Optical technologies have the capability to overcome the problems of extensive sample preparation and long measurement cycles that are known from widely used detection techniques such as mass spectrometry and gas chromatography. The threat of bombings has also produced interest in standoff techniques — in addition to checkpoint applications for screening of persons. Even in this field, optical technologies are well suited: to date, Raman spectroscopy and laser‐induced breakdown spectroscopy (LIBS) seem to be the most promising technologies, but other optical methods are permanently developed. Particularly detection in the midinfrared (MIR) spectral region, providing selective fingerprints of molecules in the range from 3 to 11 µm, has experienced a renaissance with development of new laser sources, detectors, and spectroscopic techniques. In this paper, some comparatively new techniques for the detection of explosives in the MIR spectral range, relying on quantum cascade lasers (QCLs) and photoacoustic spectroscopy (PAS), are presented. Another emphasis is put on the indirect detection of explosives via characteristic decomposition products and their active generation with laser‐induced photodissociation techniques.

show abstract

Application of mid-infrared cavity-ringdown spectroscopy to trace explosives vapor detection using a broadly tunable (6-8 μm) optical parametric oscillator

Cited by 132 publications

References 1 publication

Cavity-enhanced optical frequency comb spectroscopy in the mid-infrared application to trace detection of hydrogen peroxide

Cavity-enhanced optical frequency comb spectroscopy in the mid-infrared application to trace detection of hydrogen peroxide

Developments of mid-infrared optical parametric oscillators for spectroscopic sensing: a review

Detection of Explosives using Pulsed Laser Fragmentation andMIRSpectroscopy

Contact Info

Product

Resources

About