LED-based NDIR natural gas analyzer

Fanchenko, S. D.; Baranov, Alexander; Savkin, A. V.; Sleptsov, V. V.

doi:10.1088/1757-899x/108/1/012036

Cited by 20 publications

(11 citation statements)

References 7 publications

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“…The principle of operation for IR laser-absorption sensors is not different from a bench-top spectrometer [36,37]. As the laser beam passes through the atmosphere, a detector measures the loss in radiation intensity as a function of wavenumber.…”

Section: Sensors For Trace Gasesmentioning

confidence: 99%

Unmanned Aerial Systems for Monitoring Trace Tropospheric Gases

Schuyler

Guzmán

2017

Atmosphere

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Abstract:The emission of greenhouse gases (GHGs) has changed the composition of the atmosphere during the Anthropocene. Accurately documenting the sources and magnitude of GHGs emission is an important undertaking for discriminating the contributions of different processes to radiative forcing. Currently there is no mobile platform that is able to quantify trace gases at altitudes <100 m above ground level that can achieve spatiotemporal resolution on the order of meters and seconds. Unmanned aerial systems (UASs) can be deployed on-site in minutes and can support the payloads necessary to quantify trace gases. Therefore, current efforts combine the use of UASs available on the civilian market with inexpensively designed analytical systems for monitoring atmospheric trace gases. In this context, this perspective introduces the most relevant classes of UASs available and evaluates their suitability to operate three kinds of detectors for atmospheric trace gases. The three subsets of UASs discussed are: (1) micro aerial vehicles (MAVs); (2) vertical take-off and landing (VTOL); and, (3) low-altitude short endurance (LASE) systems. The trace gas detectors evaluated are first the vertical cavity surface emitting laser (VCSEL), which is an infrared laser-absorption technique; second two types of metal-oxide semiconductor sensors; and, third a modified catalytic type sensor. UASs with wingspans under 3 m that can carry up to 5 kg a few hundred meters high for at least 30 min provide the best cost and convenience compromise for sensors deployment. Future efforts should be focused on the calibration and validation of lightweight analytical systems mounted on UASs for quantifying trace atmospheric gases. In conclusion, UASs offer new and exciting opportunities to study atmospheric composition and its effect on weather patterns and climate change.

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Section: Sensors For Trace Gasesmentioning

confidence: 99%

Unmanned Aerial Systems for Monitoring Trace Tropospheric Gases

Schuyler

Guzmán

2017

Atmosphere

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“…The output optical power of tungsten-halogen lamps and thermal emitters is much higher than that of infrared LEDs; however, their emission cannot be intrinsically modulated to higher frequency [ 99 , 119 ]. Infrared LEDs have a weak output optical power (in mW level) [ 120 , 121 ], but they can be intrinsically modulated to high frequency, thus simplifying the sensor structure [ 113 ]. Contrary to the high operation temperature of tungsten-halogen lamps and thermal emitters, infrared LEDs operate at room temperature, which requires no additional heatsinks [ 113 ].…”

Section: Dissolved Co Measurement Methodsmentioning

confidence: 99%

Review of Dissolved CO and H2 Measurement Methods for Syngas Fermentation

Dang

Wang

Atiyeh

2021

Sensors

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Syngas fermentation is a promising technique to produce biofuels using syngas obtained through gasified biomass and other carbonaceous materials or collected from industrial CO-rich off-gases. The primary components of syngas, carbon monoxide (CO) and hydrogen (H2), are converted to alcohols and other chemicals through an anaerobic fermentation process by acetogenic bacteria. Dissolved CO and H2 concentrations in fermentation media are among the most important parameters for successful and stable operation. However, the difficulties in timely and precise dissolved CO and H2 measurements hinder the industrial-scale commercialization of this technique. The purpose of this article is to provide a comprehensive review of available dissolved CO and H2 measurement methods, focusing on their detection mechanisms, CO and H2 cross interference and operations in syngas fermentation process. This paper further discusses potential novel methods by providing a critical review of gas phase CO and H2 detection methods with regard to their capability to be modified for measuring dissolved CO and H2 in syngas fermentation conditions.

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“…Одним из способов уменьшения температурного влияния на показания ГА является подбор рабочей длины волны СД и узкополосного фильтра для взаимной компенсации изменений амплитуды и максимума излучения [8]. Для повышения достоверности показаний ГА наряду с использованием аналитических выражений, корректирующих значение полезного сигнала [5,7], широко применяют также и термостабилизацию чувствительных элементов с помощью одно-или двухступенчатых термоэлектрических охладителей (ТЭО), снабженных термодатчиком и блоком питания с обратной связью [5,[9][10][11][12]. Использование ТЭО позволяет значительно уменьшить интервал неконтролируемого изменения температуры как чувствительных элементов, так и электронного обрамления сенсора [13], что увеличивает точность "…”

Section: недисперсионные ик газоанализаторыunclassified