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  • Other Sources  (5)
  • 2000-2004  (5)
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  • 1
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    Compact CH4 sensor based on difference frequency mixing of diode lasers in quasi-phasematched LiNbO3 (2000)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A compact, portable and robust room temperature CH4 sensor is reported. By difference frequency mixing a 500 mW alpha-DFB diode laser at 1066 nm and an erbium-doped fiber amplified 1574 nm DFB diode laser in periodically poled lithium niobate up to 7 (mu)W of narrowband radiation at 3.3 microns is generated. Real-time monitoring of CH4 over a 7 day period using direct absorption in an open-path multipass cell (L = 36 m) demonstrates a detection precision of +/- 14 ppb.
    Keywords: Instrumentation and Photography
    Type: Optics communications (ISSN 0030-4018); Volume 175; 4-6; 461-8
    Format: text
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  • 2
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    Development of an automated diode-laser-based multicomponent gas sensor (2000)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The implementation and application of a portable fiber-coupled trace-gas sensor for the detection of several trace gases, including CO2, CH4, and H2CO, are reported. This particular sensor is based on a cw fiber-amplified near-infrared (distributed Bragg reflector) diode laser and an external cavity diode laser that are frequency converted in a periodically poled lithium niobate crystal to the mid-IR spectroscopic fingerprint region (3.3-4.4 micrometers). A continuous absorption spectrum of CH4 and H2CO from 3.37 to 3.10 micrometers with a spectral resolution of 40 MHz (approximately 0.0013 cm-1) demonstrated the spectral performance that can be achieved by means of automated wavelength tuning and phase matching with stepper motor control. Autonomous long-term detection of ambient CO2 and CH4 over a 3- and 7-day period was also demonstrated.
    Keywords: Life Sciences (General)
    Type: Applied optics (ISSN 0003-6935); Volume 39; 24; 4444-50
    Format: text
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  • 3
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    Yb fiber laser pumped mid-IR source based on difference frequency generation and its application to ammonia detection (2001)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A Yb fiber laser pumped cw narrow-linewidth tunable mid-IR source based on a difference frequency generation (DFG) in a periodically poled LiNbO3 (PPLN) crystal for trace gas detection was demonstrated. A high power Yb fiber laser and a distributed feedback (DFB) laser diode were used as DFG pump sources. This source generated mid-IR at 3 microns with a powers of ~2.5 microW and a spectral linewidth of less than 30 MHz. A frequency tuning range of 300 GHz (10 cm-1) was obtained by varying the current and temperature of the DFB laser diode. A high-resolution NH3 absorption Doppler-broadened spectrum at 3295.4 cm-1 (3.0345 microns) was obtained at a cell pressure of 27 Pa from which a detection sensitivity of 24 ppm m was estimated.
    Keywords: Life Sciences (General)
    Type: Japanese journal of applied physics (ISSN 0021-4922); Volume 40 Pt 1; 2A; 625-8
    Format: text
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  • 4
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    13CO2/12CO2 isotopic ratio measurements using a difference frequency-based sensor operating at 4.35 micrometers (2002)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A portable modular gas sensor for measuring the 13C/12C isotopic ratio in CO2 with a precision of 0.8%(+/-1 sigma) was developed for volcanic gas emission studies. This sensor employed a difference frequency generation (DFG)-based spectroscopic source operating at 4.35 micrometers (approximately 2300 cm-1) in combination with a dual-chamber gas absorption cell. Direct absorption spectroscopy using this specially designed cell permitted rapid comparisons of isotopic ratios of a gas sample and a reference standard for appropriately selected CO2 absorption lines. Special attention was given to minimizing undesirable precision degrading effects, in particular temperature and pressure fluctuations.
    Keywords: Meteorology and Climatology
    Type: Applied physics. B, Lasers and optics (ISSN 0946-2171); Volume 75; 2-3; 289-95
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  • 5
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    Novel diode laser-based sensors for gas sensing applications (2000)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The development of compact spectroscopic gas sensors and their applications to environmental sensing will be described. These sensors employ mid-infrared difference-frequency generation (DFG) in periodically poled lithium niobate (PPLN) crystals pumped by two single-frequency solid state lasers such as diode lasers, diode-pumped solid state, and fiber lasers. Ultrasensitive, highly selective, and real-time measurements of several important atmospheric trace gases, including carbon monoxide, nitrous oxide, carbon dioxide, formaldehyde [correction of formaldehye], and methane, have been demonstrated.
    Keywords: Life Sciences (General)
    Type: Laser physics (ISSN 1054-660X); Volume 10; 1; 348-54
    Format: text
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