Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Roller A"'
Autor:
Elke Roller
Publikováno v:
Materials Science Forum. 854:193-199
VTLG is a new type of laser-based strip thickness gauges for cold rolling mills and offersthe solution for strip thickness measurement that the industry has long been searching for:Irrespective of the alloy, contact-free, highly precise and reliable.
Autor:
M. Horstjann, Robert F. Curl, Chad Roller, Gerard Wysocki, Damien Weidmann, Y.A. Bakhirkin, Anatoliy A. Kosterev, Stephen So, Frank K. Tittel
Publikováno v:
The 17th Annual Meeting of the IEEELasers and Electro-Optics Society, 2004. LEOS 2004..
Diode and quantum cascade lasers can be used for trace gas detection in ambient air based on absorption and photoacoustic spectroscopy. Advances in spectroscopic detection techniques have resulted in minimum detectable absorbances of 10/sup -5/ in se
Autor:
Chad Roller, Matthew P. Fraser, Robert F. Curl, Anatoliy A. Kosterev, Frank K. Tittel, Damien Weidmann
Publikováno v:
Applied optics. 43(16)
We report on the development and performance of a gas sensor based on a quantum cascade laser operating at a wavelength of approximately 10 microns to measure ethylene (C2H4) concentrations by use of a rotational component of the fundamental nu 7 ban
Autor:
Robert F. Curl, Anatoliy A. Kosterev, Chad Roller, Kiyoji Uehara, Claire F. Gmachl, Damien Weidmann, Frank K. Tittel
Publikováno v:
Frontiers in Optics.
Recent research has identified carbonyl sulfide (OCS) in expired human breath as a possible marker for liver disease and acute allograft rejection in lung transplant recipients [1,2]. This is an exciting possibility in that exhaled breath analysis ma
Autor:
Anatoliy A. Kosterev, Chad Roller, Damien Weidmann, Robert F. Curl, Frank K. Tittel, Matthew P. Fraser
Publikováno v:
Frontiers in Optics.
Ethylene monitoring is important in atmospheric chemistry, medical diagnostics, biology and agronomy. A tunable quantum cascade laser spectrometer has been developed to measure ethylene concentrations in the 10 µm region. The laser is thermoelectric
Autor:
Patrick J. McCann, Adam Mock, Mark A. Camp, James D. Jeffers, Chad Roller, Khosrow Namjou, Joe Grego
Publikováno v:
Applied optics. 41(28)
We used a high-resolution mid-IR tunable-laser absorption spectroscopy TLAS system with a single IV–VI laser operating near 5.2 m to measure the level of exhaled nitric oxide eNO in human breath. A method of internal calibration using simultaneous
Publikováno v:
Laser Applications to Chemical and Environmental Analysis.
NO and CO2 were measured simultaneously in exhaled breath from seven subjects 10 times over a period of 12 days. Exhaled CO2 was used to estimate NO values as laser characteristics fluctuate over time.
Publikováno v:
Optical Remote Sensing.
A single IV-VI semiconductor mid-IR laser used in an absorption spectrometer was temperature tuned to obtain spectra of C6H6 and C7H8 covering over 100cm-1 in the region 1880cm-1-1980cm-1.
Publikováno v:
Fourier Transform Spectroscopy.
A Fourier transform spectrometer was used to characterize the emissions of IV-VI semiconductor mid-IR lasers. A completely automated hardware and software system was used to generate and analyze emission spectra.
Autor:
James D. Jeffers, Khosrow Namjou, Rodolfo Salas, Chad Roller, Pratyuma C. Kamat, Patrick J. McCann, Ali Faramarzalian
Publikováno v:
Applied Optics. 46:3969
A high-resolution liquid-nitrogen-free mid-infrared tunable diode laser absorption spectroscopy (TDLAS) system was used to perform real-time measurement of acetaldehyde concentrations in human exhaled breath following ingestion of an alcoholic bevera