Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Y.A. Bakhirkin"'
Publikováno v:
Applied Physics B. 92:103-109
A trace gas sensor based on quartz enhanced photoacoustic spectroscopy (QEPAS) was evaluated using humidified nitrogen samples and ambient air. Relaxation processes following vibrational excitation of 2ν3 state of CH4 were investigated. Sensor perfo
Autor:
Anatoliy A. Kosterev, Rafal Lewicki, Stephen So, Y.A. Bakhirkin, Frank K. Tittel, Gerard Wysocki, Robert F. Curl, Matthew P. Fraser
Publikováno v:
Applied Physics B. 90:165-176
Quantum cascade (QC) lasers are virtually ideal mid-infrared sources for trace gas monitoring. They can be fabricated to operate at any of a very wide range of wavelengths from ∼ 3 μm to ∼ 24 μm. Seizing the opportunity presented by mid-infrare
Publikováno v:
Applied Physics B. 85:445-452
A nitric oxide (NO) sensor employing a thermoelectrically cooled, continuous-wave, distributed feedback quantum cascade laser operating at 5.47 μm (1828 cm-1) and off-axis integrated cavity output spectroscopy was used to measure NO concentrations i
Publikováno v:
Applied Physics B. 85:391-396
A continuous-wave, mid-infrared, distributed feedback, interband cascade laser was used to detect and quantify formaldehyde (H2CO) using off axis, integrated cavity output spectroscopy in gas mixtures ranging from 1-25 ppmV in H2CO.
Publikováno v:
The Review of Laser Engineering. 34:275-282
Autor:
Frank K. Tittel, Jérôme Faist, D.A. Yarekha, Robert F. Curl, Anatoliy A. Kosterev, L. Hvozdara, Y.A. Bakhirkin, Marcella Giovannini
Publikováno v:
Applied Physics B. 82:149-154
A nitric oxide (NO) gas sensor based on a thermoelectrically cooled, continuous-wave, distributed feedback quantum cascade laser operating at 5.45 μm (1835 cm-1) and off-axis integrated cavity output spectroscopy combined with a wavelength-modulatio
Publikováno v:
Applied Physics B. 80:133-138
A trace gas sensor based on quartz-enhanced photoacoustic spectroscopy with a quantum cascade laser operating at 4.55 μm as an excitation source was developed. The sensor performance was evaluated for the detection of N2O and CO. A noise-equivalent
Autor:
Anatoliy A. Kosterev, M. Horstjann, Y.A. Bakhirkin, Cory J. Hill, Robert F. Curl, Rui Q. Yang, Frank K. Tittel, C.M. Wong
Publikováno v:
Applied Physics B. 79:799-803
A novel continuous-wave mid-infrared distributed feedback interband cascade laser was utilized to detect and quantify formaldehyde (H2CO) using quartz-enhanced photoacoustic spectroscopy. The laser was operated at liquid-nitrogen temperatures and pro
Autor:
Lubos Hvozdara, Anatoliy A. Kosterev, Frank K. Tittel, Y. Bonetti, Stéphane Blaser, Y.A. Bakhirkin
Publikováno v:
Applied Physics B. 78:673-676
The phase information obtained in photoacoustic experiments can be used to separate the signals originating from chemical species with overlapping absorption spectra. This approach was applied to quantify parts per million CO levels in propylene usin
Autor:
J. H. Doty, Timothy Day, Steven F. Solga, David Thomazy, Y.A. Bakhirkin, Deborah Kane, Lei Dong, Frank K. Tittel, Terence H. Risby, Anatoliy A. Kosterev, Rafal Lewicki
Publikováno v:
Conference on Lasers and Electro-Optics/International Quantum Electronics Conference.
Quantum cascade laser based breath sensor platform for medical applications employing a quartz-enhanced photoacoustic spectroscopy technique is reported. The detection sensitivity for exhaled ammonia is at ≪10 ppbv level with 1 s time resolution.