High sensitivity methane analyzer based on tuned near infrared diode laser

Nadezhdinskii, Alexander I.; Berezin, A. G.; Chernin, Semen M.; Ершов, О. В.; Kutnyak, Vladimir G.

doi:10.1016/s1386-1425(99)00080-3

Cited by 42 publications

(16 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Remote detection (1,2), gas detection in industry (3), and in situ balloon concentration measurements (4,5) have been performed for methane using lines of the 2ν 3 band near 1.65 µm. The accuracy of these concentration measurements is limited by the accuracy with which the line intensities are known.…”

Section: Introductionmentioning

confidence: 99%

Line Intensity of R(0) and R(3) of the 12CH4 2ν3 Band from Diode Laser Spectroscopy

Hurtmans

Dufour

Bell

et al. 2002

Journal of Molecular Spectroscopy

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Line Intensity of R(0) and R(3) of the 12CH4 2ν3 Band from Diode Laser Spectroscopy

Hurtmans

Dufour

Bell

et al. 2002

Journal of Molecular Spectroscopy

View full text Add to dashboard Cite

“…This instrument is the best for e ciency when compared with existing analogues: the threshold sensitivity to methane is 0.02 ppm, the long-time stability of measurements is 0.1 ppm, selectivity with respect to other gases no less than 10 4 . In [14] we compared our data on the threshold senitivity to methane with the appropriate results of methane detection by other techniques. The instrument sensitivity can be improved employing multilayer high-re ection mirror coatings to increase the path length.…”

Section: A Promising Version Of the Multipass Matrix Systemmentioning

confidence: 99%

Development of optical multipass matrix systems

Chernin¹

2001

Journal of Modern Optics

View full text Add to dashboard Cite

The basic principles of designing multipass matrix systems (MMSs) are considered. A promising version of the MMS providing complete stability of the exit image is discussed. The new matrix system is versatile and most suitable, due to its potentialities and optical properties, for use in laser spectroscopy. A multipass transferable gas analyser comprising this matrix system and non-cooled diode lasers enabled record (for instruments of this type) sensitivity values to be achieved. In particular, the threshold sensitivity to methane is 0.02 ppm and the long-time stability of the measurements is 0.1 ppm. Designs of small large-aperture four-and six-row matrix systems are depicted.

show abstract

“…The broad availability of laser diodes for the near-infrared region (NIR) allows for the observation of specific gas resonance lines [ 1 ] while preserving compatibility with optical fibers [ 2 ]. Laser diodes can be tuned rapidly, or modulated around a specific absorption peak [ 3 ], while information about gas concentration is extracted from the sensor response. The sensitivity of such sensors depends primarily on the optical path length in the gaseous medium and the modulation/demodulation technique.…”

Section: Introductionmentioning

confidence: 99%

A Fiber-Optic Gas Sensor and Method for the Measurement of Refractive Index Dispersion in NIR

Njegovec

Đonlagić

2020

Sensors

View full text Add to dashboard Cite

This paper presents a method for gas concentration determination based on the measurement of the refractive index dispersion of a gas near the gas resonance in the near-infrared region (NIR). The gas refractive index dispersion line shape is reconstructed from the variation in the spectral interference fringes’ periods, which are generated by a low-finesse Fabry-Perot interferometer during the DFB diode’s linear-over-time optical frequency sweep around the gas resonance frequency. The entire sensing system was modeled and then verified experimentally, for an example of a low concentration methane-air mixture. We demonstrate experimentally a refractive index dispersion measurement resolution of 2 × 10−9 refractive index units (RIU), which corresponds to a change in methane concentration in air of 0.04 vol% at the resonant frequency of 181.285 THz (1653.7 nm). The experimental and modeling results show an excellent agreement. The presented system utilizes a very simple optical design and has good potential for the realization of cost-efficient gas sensors that can be operated remotely through standard telecom optical fibers.

show abstract

High sensitivity methane analyzer based on tuned near infrared diode laser

Cited by 42 publications

References 10 publications

Line Intensity of R(0) and R(3) of the 12CH4 2ν3 Band from Diode Laser Spectroscopy

Line Intensity of R(0) and R(3) of the 12CH4 2ν3 Band from Diode Laser Spectroscopy

Development of optical multipass matrix systems

A Fiber-Optic Gas Sensor and Method for the Measurement of Refractive Index Dispersion in NIR

Contact Info

Product

Resources

About