scholarly journals Air-broadening in near-infrared carbon dioxide line shapes: Quantifying contributions from O2, N2, and Ar

2021 ◽  
Vol 270 ◽  
pp. 107669
Author(s):  
Erin M. Adkins ◽  
David A. Long ◽  
Joseph T. Hodges
Keyword(s):  
Carbon Dioxide ◽  
Near Infrared ◽  
Line Shapes

Effect of Variation in Arterial Carbon Dioxide Levels on Cerebral-Somatic Oxygenation in Children with Cyanotic Congenital Heart Disease

2018 ◽  
pp. 1-6
Keyword(s):  
Carbon Dioxide ◽  
Congenital Heart Disease ◽  
Blood Flow ◽  
Heart Disease ◽  
Infrared Spectroscopy ◽  
Congenital Heart ◽  
Near Infrared ◽  
Cyanotic Congenital Heart Disease ◽  
Anesthesia Induction ◽  
Arterial Blood

Background: Hypocapnia is suggested in decreasing pulmonary vascular resistance in cyanotic congenital heart disease patients undergoing definitive repair. But its effects on cerebral and renal circulation are unclear. Hence the effect of changes in arterial blood carbon dioxide tensions (PaCo2 ) on cerebral (ScO2 %) and renal (SsO2 %) oxygenation indices using Near Infrared spectroscopy (NIRS) is examined. Methods: We did a prospective observational study in sixty-eight children who underwent elective cardiac surgery for various cyanotic congenital heart diseases. PaCo2 , ScO2 % and SsO2 % were obtained before induction of anesthesia, after anesthesia induction at normocapnic or mild hypercapnic ventilation (EtCo2 =40 mmHg) and again at hypocapnic ventilation (EtCo2 =30 mmHg). Regression analysis was done between PaCo2 and NIRS-C/ScO2 % and PaCo2 and NIRS-R/SsO2 % at both EtCo2 40 and 30 mmHg. Repeated measure analysis performed to evaluate the significance of change in NIRS-C and NIRS-R from pre-anesthesia induction to when EtCo2 was 40 and then 30 mmHg post anesthesia induction. Results: With decrease in EtCo2 , PaCo2 (p=0.0001), NIRS-C (p=0.0001) and NIRS-R (p=0.0001) decreased significantly. At EtCo2 of 40 and 30 mmHg, PaCo2 had significant positive correlation with NIRS-C (R2 =0.77, p=0.0001 and R2 =0.92, p=0.0001 respectively) and had insignificant correlation with NIRS-R (R2 =0.03, p=0.12 and R2 =0.008, p=0.46 respectively). Significant changes in NIRS-C {p=0.0001} and NIRS-R {p=0.0001} occurred from pre-induction to when EtCo2 was 40 and then to 30 mmHg. Conclusion: A decrease in NIRS-C and NIRS-R is probably from decreased cerebral and splanchnic blood flow during hypocapnic ventilation, leading to demand supply mismatch. Hypocapnic ventilation in cyanotic children has potential to cause cerebral hypoxia. Abbreviations: CCHD: Cyanotic Congenital Heart Disease; QP: Pulmonary blood flow; Do2 : Oxygen delivery; SpO2 : peripheral pulse oximetry; NIRS: Near Infrared Spectroscopy; NIRS-C/ScO2 %: Regional Cerebral Oxygen saturation; NIRS-R/SsO2 %: Regional Somatic/renal Oxygen saturation; HCT: Hematocrit; ECG: Electrocardiography; CPB: cardiopulmonary bypass; TOF: Tetralogy of fallot; BDG: Bidirectional Glenn Shunt; BT shunt: Blalock Taussig shunt; DORV: Double outlet right ventricle; FiO2 : Inspired oxygen concentration; ABG: Arterial blood gas; PaO2 : Arterial oxygen partial pressure; PaCo2 : Arterial carbon dioxide partial pressure; HR: Heart rate; MAP: Mean Arterial Pressure; CVP: Central Venous Pressure

scholarly journals Update on GOSAT TANSO-FTS performance, operations, and data products after more than 6 years in space

2016 ◽  
Vol 9 (6) ◽  
pp. 2445-2461 ◽  
Author(s):  
Akihiko Kuze ◽  
Hiroshi Suto ◽  
Kei Shiomi ◽  
Shuji Kawakami ◽  
Makoto Tanaka ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Near Infrared ◽  
Satellite System ◽  
Fourier Transform Spectrometer ◽  
Infrared Sensor ◽  
Data Set ◽  
Dry Air ◽  
Retrieval Accuracy ◽  
Carbon Dioxide Co2

Abstract. A data set containing more than 6 years (February 2009 to present) of radiance spectra for carbon dioxide (CO2) and methane (CH4) observations has been acquired by the Greenhouse gases Observing SATellite (GOSAT, available at http://data.gosat.nies.go.jp/GosatUserInterfaceGateway/guig/GuigPage/open.do), nicknamed “Ibuki”, Thermal And Near infrared Sensor for carbon Observation Fourier Transform Spectrometer (TANSO-FTS). This paper provides updates on the performance of the satellite and TANSO-FTS sensor and describes important changes to the data product, which has recently been made available to users. With these changes the typical accuracy of retrieved column-averaged dry air mole fractions of CO2 and CH4 (XCO2 and XCH4, respectively) are 2 ppm or 0.5 % and 13 ppb or 0.7 %, respectively. Three major anomalies of the satellite system affecting TANSO-FTS are reported: a failure of one of the two solar paddles in May 2014, a switch to the secondary pointing system in January 2015, and most recently a cryocooler shutdown and restart in August 2015. The Level 1A (L1A) (raw interferogram) and the Level 1B (L1B) (radiance spectra) of version V201 described here have long-term uniform quality and provide consistent retrieval accuracy even after the satellite system anomalies. In addition, we discuss the unique observation abilities of GOSAT made possible by an agile pointing mechanism, which allows for optimization of global sampling patterns.

The structure of the carbon dioxide dimer from near infrared spectroscopy

1987 ◽  
Vol 86 (8) ◽  
pp. 4341-4346 ◽  
Author(s):  
K. W. Jucks ◽  
Z. S. Huang ◽  
D. Dayton ◽  
R. E. Miller ◽  
W. J. Lafferty
Keyword(s):  
Carbon Dioxide ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared
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