Spectroscopic Investigations of High-Power Laser-Induced Dielectric Breakdown in Gas Mixtures Containing Carbon Monoxide

2008 ◽  
Vol 112 (31) ◽  
pp. 7162-7169 ◽  
Author(s):  
Svatopluk Civiš ◽  
Dagmar Babánková ◽  
Jaroslav Cihelka ◽  
Petr Sazama ◽  
Libor Juha
Keyword(s):  
Carbon Monoxide ◽  
High Power ◽  
Dielectric Breakdown ◽  
Gas Mixtures ◽  
High Power Laser ◽  
Power Laser ◽  
Spectroscopic Investigations

scholarly journals A Sensitive Carbon Monoxide Sensor Based on Photoacoustic Spectroscopy with a 2.3 μm Mid-Infrared High-Power Laser and Enhanced Gas Absorption

Sensors ◽  
2019 ◽  
Vol 19 (14) ◽  
pp. 3202 ◽  
Author(s):  
Shunda Qiao ◽  
Yufei Ma ◽  
Ying He ◽  
Xin Yu ◽  
Zhonghua Zhang ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Optical Absorption ◽  
Output Power ◽  
High Power ◽  
Photoacoustic Spectroscopy ◽  
Gas Absorption ◽  
Sensor System ◽  
Integration Time ◽  
High Power Laser ◽  
Power Laser

A photoacoustic spectroscopy (PAS)-based carbon monoxide (CO) gas sensor with a high-power laser and an enhanced gas absorption was demonstrated. The light source was a distributed feedback (DFB), continuous wave (CW) diode laser with a high output power of ~8 mW to give a strong excitation. The target gas received optical absorption enhanced two times by using a right-angle prism reflecting the laser beam. In order to reduce the noise from the background, wavelength modulation spectroscopy (WMS) and second-harmonic detection techniques were used. The modulation frequency and modulation depth were optimized theoretically and experimentally. Water vapor was added in the PAS sensor system to increase the vibrational–translational (V–T) relaxation rate of the CO molecule, which resulted in an ~8 times signal enhancement compared with the using of a dry CO/N2 gas mixture. The amplitude of the 2f signal had a 1.52-fold improvement compared to the one with only one time absorption. The experimental results showed that such a sensor had an excellent linear response to the optical power and gas concentration. At 1 s integration time, a minimum detection limit (MDL) for CO detection of 9.8 ppm was achieved. The long-term stability of the sensor system was evaluated with an Allan deviation analysis. When the integration time was 1100 s, the MDL improved to be 530 ppb. The detection performance of such a PAS-based CO sensor can be further improved when a laser with a higher output power and increasing optical absorption times is used.

Amino acid formation induced by high-power laser in CO2/CO–N2–H2O gas mixtures

2004 ◽  
Vol 386 (1-3) ◽  
pp. 169-173 ◽  
Author(s):  
Svatopluk Civiš ◽  
Libor Juha ◽  
Dagmar Babánková ◽  
Josef Cvačka ◽  
Ota Frank ◽  
...  
Keyword(s):  
Amino Acid ◽  
High Power ◽  
Gas Mixtures ◽  
Acid Formation ◽  
High Power Laser ◽  
Power Laser

Optical and X-ray Emission Spectroscopy of High-Power Laser-Induced Dielectric Breakdown in Molecular Gases and Their Mixtures

2006 ◽  
Vol 110 (44) ◽  
pp. 12113-12120 ◽  
Author(s):  
Dagmar Babánková ◽  
Svatopluk Civiš ◽  
Libor Juha ◽  
Michal Bittner ◽  
Jaroslav Cihelka ◽  
...  
Keyword(s):  
High Power ◽  
Emission Spectroscopy ◽  
Dielectric Breakdown ◽  
High Power Laser ◽  
Power Laser ◽  
X Ray ◽  
Molecular Gases

Spectroscopic investigations of high-energy-density plasma transformations in a simulated early reducing atmosphere containing methane, nitrogen and water

2016 ◽  
Vol 18 (39) ◽  
pp. 27317-27325 ◽  
Author(s):  
Martin Civiš ◽  
Martin Ferus ◽  
Antonín Knížek ◽  
Petr Kubelík ◽  
Michal Kamas ◽  
...  
Keyword(s):  
Energy Density ◽  
High Power ◽  
Large Scale ◽  
High Energy ◽  
Gas Mixtures ◽  
High Energy Density ◽  
High Power Laser ◽  
Power Laser ◽  
Reducing Atmosphere ◽  
Density Plasma

Gas mixtures containing methane were treated by large-scale plasma using high-power laser.

Feasibility Experiments for Underwater Shock and Bubble Generation with a High-Power Laser

1999 ◽  
Author(s):  
Theodore G. Jones ◽  
Jacob Grun ◽  
H. R. Burris ◽  
Charles Manka
Keyword(s):  
High Power ◽  
High Power Laser ◽  
Power Laser ◽  
Bubble Generation ◽  
Underwater Shock

Ultra-sensitive Absorption Diagnostics of Thin Films for High-power Laser Interference Coatings

2015 ◽  
Author(s):  
Jorge G. Rocca ◽  
Oscar E. Martinez ◽  
Carmen Menoni ◽  
Esteban Domene
Keyword(s):  
Thin Films ◽  
High Power ◽  
High Power Laser ◽  
Laser Interference ◽  
Power Laser
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