&lt;title&gt;Two-channel CO2 laser system for heterodyne applications&lt;/title&gt;

Sherstov, I. V.; Bychkov, K. V.; Chernikov, S. B.; Karapuzikov, A. I.; Spitcin, V. V.; Vasiliev, V. A.

doi:10.1117/12.606294

Cited by 6 publications

(5 citation statements)

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“…All discs were stored under laboratory conditions until 2009, so the wood can be considered to be room-dried. The measurements were made using a homemade laser photoacoustic spectrometer with a computer-controlled tunable waveguide CO 2 –laser [10]. The detection limit of the spectrometer for a laser power of 70 mW was 2 × 10 −5 cm −1 and the measurement error was ±5%.…”

Section: Methodsmentioning

confidence: 99%

Laser Photoacoustic Detection of CO2 in Old Disc Tree-Rings

Ageev

Ponomarev

Sapozhnikova

2010

Sensors

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A homemade CO2–laser photoacoustic spectrometer has been used for monitoring CO2 in gas samples extracted under vacuum from the wood of old spruce disc tree-rings for a ∼60 year series. The experimental results show that (1) the CO2 concentration exhibits annual trends correlated with an increase in atmospheric CO2 in a number of cases; (2) at the time when the annual CO2 trend changes from positive to negative, the annual tree-ring stable carbon isotope ratios (δ13C) of CO2 change as well; (3) the disc tree-ring widths are observed to decrease in most cases where the annual CO2 increased; (4) simultaneously with the annual CO2 variation, annual H2O distribution was detected in gas samples of the wood tree-rings of one spruce disc. The observed patterns of the annual CO2 distribution in the disc tree-rings are assumed to be the evidence of the impact of the atmospheric CO2 increase. In other words, a change in the concentration gradient between the stem and the atmospheric CO2 may lead to a gradual CO2 accumulation in the stem because of a decrease in the diffusion rate and to a change in the tree parameters.

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Section: Methodsmentioning

confidence: 99%

Laser Photoacoustic Detection of CO2 in Old Disc Tree-Rings

Ageev

Ponomarev

Sapozhnikova

2010

Sensors

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“…The instruments were assembled by one principal scheme ( Fig. 1, a, b) on the base of waveguide frequency-tunable CO2 lasers [12]. The lasers emit in bands of 10 and 9 µm at more than 70 lines of P and R branches at an output generation power up to 3 W at strong lines and up to 0.5 W at weak ones.…”

Section: Description Of the Construction And Specifications Of The Usmentioning

confidence: 99%

“…Applying a specially working out method [25] we have conducted the isotope analysis of the desorbed gas in order to argue that the extracted CO 2 is not introduced from the atmosphere. Results have shown that gas samples, desorbed from discs of pine, Siberian stone pine, larch, and spruce are enriched by the light isotope 12 С up to values (δ 13 C) = −25.3‰ for spruce; vary between −25‰ (1894) and −36.4‰ (1986) for Siberian stone pine, between δ 13 С ≈ −25‰ and δ 13 С ≈ −30‰ for larch, and between δ 13 С ≈ −25‰ and δ 13 С ≈ −34‰ for pine (Tomsk region, Russia), δ 13 С = −27‰ for Siberian stone pine root and δ 13 С = −33.5‰ for pine root. Evidently, the studied CO 2 is produced by stems and roots, but not introduced from the atmosphere, because the isotope composition of the atmospheric CO 2 is equal, on the average, to -8.5‰ [26].…”

Section: Investigation Of Gas Content In the Wood Of Annual Rings Of mentioning

confidence: 99%

Optoacoustic gas-analysis for diagnostics of biosystems

Ageev

Nikiforova

Ponomarev

et al. 2019

J-BPE

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A possibility of detecting biogenic gases by the laser optoacoustic gas-analysis method is shown. The construction and specifications of instruments, developed for this purpose, are described. Examples of the analysis of gas samples of various biological objects, like air, expired by patients, suffered from different illnesses, and residual gases in the wood of year rings of conifers are given together with recommendations on applying the received information.

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“…The sealed-off RF-excited waveguide CO 2 laser with computer controlled tuning frequency and stabilization to the centre of the line chosen was used as a light source [15]. It was found experimentally that such lasers have a high constructive rigidity and low sensitivity to external mechanical impacts.…”

Section: Methodsmentioning

confidence: 99%

“…The measurements were performed using a computercontrolled laser photoacoustic (PA) spectrometer with a frequency-tunable waveguide CO 2 laser [15]. PA spectroscopic methods offer essential advances in pollutant gas monitoring [7−9,16−18].…”

Section: Methodsmentioning

confidence: 99%

Laser Photoacoustic Method for Disc Tree-Ring Gas Analysis

Ageev¹,

Ponomarev²,

Sapozhnikova³

2012

ENV

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A laser photoacoustic gas analysis was used to study the annual CO 2 and H 2 O trends in tree rings and their comparison with the tree ring width of dry discs was made. The measurements show that 1) the CO 2 concentration in gas samples vacuum-extracted from annual tree rings correlates with atmospheric CO 2 rise in certain cases; approximately 4-year cycles in CO 2 distribution were readily fixed; 2) for the Scots pine discs, years with small tree ring width are characterized by high CO 2 concentration, while those with large tree ring width are associated with small CO 2 concentration. Abrupt changes in atmospheric conditions are assumed to favour increased amplitudes of one of natural cycles of annual CO 2 .

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<title>Two-channel CO2 laser system for heterodyne applications</title>

Cited by 6 publications

References 0 publications

Laser Photoacoustic Detection of CO2 in Old Disc Tree-Rings

Laser Photoacoustic Detection of CO2 in Old Disc Tree-Rings

Optoacoustic gas-analysis for diagnostics of biosystems

Laser Photoacoustic Method for Disc Tree-Ring Gas Analysis

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