Gas analysis in the UV region using a long-length hollow core waveguide

Hollow Core Fiber Guides As Gas Analysis Cells for Laser Spectroscopy

Optical Sensors and Microsystems ◽

10.1007/0-306-47099-3_20 ◽

2005 ◽

pp. 235-240

Author(s):

A. Lancia

Keyword(s):

Laser Spectroscopy ◽

Gas Analysis ◽

Hollow Core ◽

Core Fiber

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Gas analysis in the UV region: a hollow-core waveguide sensor system

10.1117/12.566549 ◽

2004 ◽

Cited By ~ 1

Author(s):

Hanns S. Eckhardt ◽

H. Dominick ◽

Matthias Frank ◽

Kenneth T. Grattan ◽

Karl-Friedrich Klein

Keyword(s):

Gas Analysis ◽

Sensor System ◽

Hollow Core ◽

Waveguide Sensor

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Analysis of Natural Gas Using a Portable Hollow-Core Photonic Crystal Coupled Raman Spectrometer

Applied Spectroscopy ◽

10.1177/0003702820915535 ◽

2020 ◽

Vol 74 (12) ◽

pp. 1496-1504

Author(s):

Maksim N. Khannanov ◽

Alexander B. Van'kov ◽

Andrei A. Novikov ◽

Anton P. Semenov ◽

Pavel A. Gushchin ◽

...

Keyword(s):

Natural Gas ◽

Gas Analysis ◽

Hollow Core ◽

Express Method ◽

Raman Spectrometer ◽

Wide Range ◽

Analysis Meeting ◽

Gas Fields ◽

532 Nm

The low accessibility of natural gas fields and transporting pipelines requires portable online analyzers of the composition of natural gas, ensuring nearly chromatographic precision and capable of in situ analysis of a wide range of gases, including infrared-inactive ones (hydrogen, oxygen, nitrogen, chlorine). We have developed an express method of gas analysis meeting all the requirements for analysis of natural gas and its derivative mixtures using a portable 532 nm Raman spectrometer rigidly connected to a hollow-core crystal photonic fiber.

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Locomotive Boiler Flue Gas Analysis*

Scientific American ◽

10.1038/scientificamerican09071912-159supp ◽

1912 ◽

Vol 74 (1914supp) ◽

pp. 159-160

Author(s):

Lawford H. Fry

Keyword(s):

Flue Gas ◽

Gas Analysis

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TOWARD GENERATION OF HIGH POWER ULTRAFAST WHITE LIGHT LASER USING FEMTOSECOND TERAWATT LASER IN A GAS-FILLED HOLLOW-CORE FIBER

Proceedings of the 70th International Symposium on Molecular Spectroscopy ◽

10.15278/isms.2015.fb10 ◽

2015 ◽

Author(s):

Walid Tawfik

Keyword(s):

White Light ◽

High Power ◽

Hollow Core ◽

Core Fiber ◽

Terawatt Laser

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Efficacy of Near-Infrared Spectrometry for Monitoring the Cerebral Effects of Severe Dilutional Anemia

The Heart Surgery Forum ◽

10.1532/hsf98.2013293 ◽

2014 ◽

Vol 17 (3) ◽

pp. 154 ◽

Cited By ~ 10

Author(s):

Arıtürk Cem ◽

Ustalar Serpil ◽

Toraman Fevzi ◽

Ökten Murat ◽

Güllü Ümit ◽

...

Keyword(s):

Blood Flow ◽

Cardiac Surgery ◽

Blood Lactate ◽

Near Infrared ◽

Bypass Graft ◽

Blood Gas Analysis ◽

Gas Analysis ◽

Infrared Spectrometry ◽

Control Group ◽

Near Infrared Spectrometry

Introduction: Clear guidelines for red cell transfusion during cardiac surgery have not yet been established. The current focus on blood conservation during cardiac surgery has increased the urgency to determine the minimum safe hematocrit for these patients. The aim of this study was to determine whether monitoring of cerebral regional oxygen saturation (rSO2) via near-infrared spectrometry (NIRS) is effective for assessing the cerebral effects of severe dilutional anemia during elective coronary arterial bypass graft surgery (CABG).Methods: The prospective observational study involved patients who underwent cerebral rSO2 monitoring by NIRS during elective isolated first-time CABG: an anemic group (N=15) (minimum Hemoglobin (Hb) N=15) (Hb >8 g/dL during CPB). Mean arterial pressure (MAP), pump blood flow, blood lactate level, pCO2, pO2 at five time points and cross-clamp time, extracorporeal circulation time were recorded for each patient. Group results statistically were compared.Results: The anemic group had significantly lower mean preoperative Hb than the control group (10.3 mg/dL versus 14.2 mg/dL; P = .001). The lowest Hb levels were observed in the hypothermic period of CPB in the anemic group. None of the controls exhibited a >20% decrease in cerebral rSO2. Eleven (73.3%) of the anemic patients required an increase in pump blood flow to raise their cerebral rSO2.Conclusions: In this study, the changes in cerebral rSO2 in the patients with low Hb were within acceptable limits, and this was in concordance with the blood lactate levels and blood-gas analysis. It can be suggested that NIRS monitoring of cerebral rSO2 can assist in decision making related to blood transfusion and dilutional anemia during CPB.

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