Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Christopher B. Winstead"'
Autor:
Christopher B. Winstead, C. H. Swartz
Publikováno v:
Materials Science in Semiconductor Processing. 91:22-26
Organic photodetectors were prepared based on polymer-fullerene blended heterojunctions using Poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) and Phenyl-C61-Butyric-Acid-Methyl Ester (PCBM). In order to investigate and
Publikováno v:
Analytical Chemistry. 77:4883-4889
We have been exploring innovative technologies for elemental and hyperfine structure measurements using cavity ring-down spectroscopy (CRDS) combined with various plasma sources. A laboratory CRDS system utilizing a tunable dye laser is employed in t
Publikováno v:
Analytica Chimica Acta. 532:47-54
This work presents the first report of uranium spectra generated by a low power microwave plasma source to conduct emission measurements. Distinct uranium peaks in the wavelength range examined from 320 to 430 nm have been successfully obtained with
Publikováno v:
IEEE Sensors Journal. 4:322-328
A new concept in optical-fiber chemical sensors, the active fiber core optical sensor (AFCOS), is presented. In this sensor, the fiber core acts as a transducer. The sensitivity of an AFCOS sensor is compared with that of an active coating [evanescen
Publikováno v:
Review of Scientific Instruments. 75:1305-1313
Recent studies combining an atmospheric-pressure plasma source (inductively coupled plasma or microwave induced plasma) with cavity ringdown spectroscopy (plasma-CRDS) have indicated significant promise for ultra-sensitive elemental measurements. Ini
Publikováno v:
Analytical Chemistry. 75:2105-2111
We are exploring sensitive techniques for elemental measurements using cavity ring-down spectroscopy (CRDS) combined with a compact microwave plasma source as an atomic absorption cell. The research work marries the high sensitivity of CRDS with a lo
Publikováno v:
Journal of Environmental Monitoring. 4:815-818
A simply structured, cheap hexachromium monitor was developed. The monitor is based on UV/VIS absorption technique. A 2-m long water core optical fiber was employed as a long path length sample cell and a UV light emitting diode (LED) was used as a l
Publikováno v:
Applied Spectroscopy. 56:386-397
The use of cavity ringdown spectroscopy (CRDS) for atomic absorption measurements in a 27-MHz low-power argon inductively coupled plasma (ICP) is described. These results are used to demonstrate the utility of CRDS for both plasma diagnostic and anal
Autor:
Christopher B. Winstead, Vimal V. Shah, R. Daniel Costley, Jagdish P. Singh, Krishnan Balasubramaniam
Publikováno v:
The Journal of the Acoustical Society of America. 105:1630-1637
A technique is described in which laser-generated shear waves can be used to measure the viscosity of liquids. The technique involves measuring the shear wave reflection coefficient at a solid–liquid interface. To accommodate this procedure, a wedg
Publikováno v:
The Analyst. 125:1021-1023
Cold vapor cavity ringdown spectroscopy has been successfully applied to the detection of elemental mercury. Using an absorption cell 0.18 m in length, detection limits of 0.027 and 0.12 ng were obtained using peak area and peak height measurements,