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Compact CH4 sensor based on difference frequency mixing of diode lasers in quasi-phasematched LiNbO3 (2000)

Tittel, F. K. ; Limpert, J. ; Weidner, R. ; [weitere]

In: Other Sources

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Publikationsdatum: 2011-08-24

Beschreibung: 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.

Schlagwort(e): Instrumentation and Photography

Materialart: Optics communications (ISSN 0030-4018); Volume 175; 4-6; 461-8

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Development of an automated diode-laser-based multicomponent gas sensor (2000)

Tittel, F. K. ; Lancaster, D. G. ; Richter, D.

In: Other Sources

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Publikationsdatum: 2011-08-24

Beschreibung: 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.

Schlagwort(e): Life Sciences (General)

Materialart: Applied optics (ISSN 0003-6935); Volume 39; 24; 4444-50

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Yb fiber laser pumped mid-IR source based on difference frequency generation and its application to ammonia detection (2001)

Fujioka, T. ; Tittel, F. K. ; Nanri, K. ; [weitere]

In: Other Sources

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Publikationsdatum: 2011-08-24

Beschreibung: 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.

Schlagwort(e): Life Sciences (General)

Materialart: Japanese journal of applied physics (ISSN 0021-4922); Volume 40 Pt 1; 2A; 625-8

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13CO2/12CO2 isotopic ratio measurements using a difference frequency-based sensor operating at 4.35 micrometers (2002)

Tittel, F. K. ; Erdelyi, M. ; Richter, D.

In: Other Sources

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Publikationsdatum: 2011-08-24

Beschreibung: 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.

Schlagwort(e): Meteorology and Climatology

Materialart: Applied physics. B, Lasers and optics (ISSN 0946-2171); Volume 75; 2-3; 289-95

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Novel diode laser-based sensors for gas sensing applications (2000)

Tittel, F. K. ; Lancaster, D. G. ; Richter, D.

In: Other Sources

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Publikationsdatum: 2011-08-24

Beschreibung: 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.

Schlagwort(e): Life Sciences (General)

Materialart: Laser physics (ISSN 1054-660X); Volume 10; 1; 348-54

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