Results 211 to 220 of about 65,160 (264)

FTIR measurements of compositional heterogeneities

SPIE Proceedings, 2007
A general approach to characterize compositional heterogeneity in polymer thin films using Fourier transform infrared (FTIR) spectroscopy has been demonstrated Polymer films with varying degrees of heterogeneity were prepared using a model chemically amplified photoresist where a photoacid catalyzed reaction-diffusion process results in the formation ...
Shuhui Kang, Bryan D. Vogt, Wen-li Wu, Vivek M. Prabhu, David L. VanderHart, Ashwin Rao, Eric K. Lin, Karen Turnquest   +7 more
openaire   +1 more source

FTIR measurements—standards and accuracy

Vibrational Spectroscopy, 2002
Abstract Many applications of mid-infrared (MIR) spectrophotometry now require known levels of uncertainty in both the abscissa and ordinate axes. The National Physical Laboratory (NPL) has long provided MIR transfer standards of regular transmittance, regular reflectance, hemispherical reflectance, and also of wavenumber, which can be used to test ...
F.J.J Clarke, J.R Birch, C.J Chunnilall, M.P Smart   +3 more
openaire   +1 more source

Laccase activity measurement by FTIR spectral fingerprinting

Enzyme and Microbial Technology, 2019
Laccases (EC 1.10.3.2) are enzymes known for their ability to catalyze the oxidation of phenolic compounds using molecular oxygen as the final electron acceptor. Laccase activity is commonly determined by monitoring spectrophotometric changes (absorbance) of the product or substrate during the enzymatic reaction. Fourier Transform Infrared Spectroscopy
Valentina Perna, Andreas Baum, Heidi A. Ernst, Jane W. Agger, Anne S. Meyer   +4 more
openaire   +3 more sources

Degree of conversion of composites measured by DTA and FTIR

Dental Materials, 2001
Differential thermal analysis (DTA) using a split fiber optic light source has been reported to be a convenient method of measuring the degree of conversion (DC) of light-activated composites. The purpose of this study was to compare the results by DTA and Fourier transformation infrared spectroscopy (FTIR), and evaluate the usefulness of the DTA ...
S, Imazato, J F, McCabe, H, Tarumi, A, Ehara, S, Ebisu   +4 more
openaire   +3 more sources

FTIR Measurements Of Minor Atmospheric Constituents

SPIE Proceedings, 1989
The major components of the Earth's atmosphere, nitrogen, oxygen and argon, are essentially transparent to infrared radiation. Most of the minor and trace gases in the atmosphere have significant infrared absorptions, which provide a means of measuring their abundance. For many years, we have been using the infrared as a remote sensing tool. As Fourier
F. J. Murcray, D. G. Murcray, F. H. Murcray, A. Goldman, R. D. Blatherwick   +4 more
openaire   +1 more source

Atmospheric measurements with unattended FTIR and Lidar

Fourier Transform Spectroscopy, 2001
A combined FTIR-lidar system allows unattended, remote measurements of infrared atmospheric emission, aerosols, and clouds with depolarization discrimination of ice and liquid.
Joseph A. Shaw, John J. Bates, Wynn L. Eberhard, Raul J. Alvarez, Scott P. Sandberg, L. Larrabee Strow   +5 more
openaire   +1 more source

Concave cell design for FTIR measurements

Chinese Chemical Letters, 2011
Abstract Wedged and V-shaped cells have advantages on depressing strong absorption bands and keeping the photo windows wide open without absorption block. Alternatively, this work presents a concave cell design, which is constructed by a plano-convex CaF 2 lens in combination with a flat plate.
Xiang Qin Lin, Zhi Xiang Zhang, Wan Qun Hu   +2 more
openaire   +1 more source

FTIR in the Paddock: Trace gas soil flux measurements using FTIR spectroscopy

AIP Conference Proceedings, 1998
We have used FTIR spectroscopy for high precision trace gas analysis combined with micrometeorological flux-gradient and chamber methods to measure the fluxes of trace gases CO2, CH4, N2O and CO between agricultural soils and the atmosphere. In flux gradient measurements, vertical profiles of the trace gases were measured every 30 minutes from the ...
D. W. T. Griffith, I. M. Jamie, P. A. Beasley, O. T. Denmead, R. Leuning, I. E. Galbally, C. P. Meyer   +6 more
openaire   +1 more source

Error analysis for emissivity measurement using FTIR spectrometer

2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS, 2013
The ground-measured emissivity is always affected by many kinds of noises, which lead the retrieval accuracy to be out of expectation. This paper investigates the influence of three major noises (formula simplification, surface temperature measurement, and temperature emissivity separation algorithm) on the spectral emissivity by using simulation data ...
Kai Yan 0001, Huazhong Ren, Ronghai Hu, Xihan Mu, Zhao Liu, Guangjian Yan   +5 more
openaire   +1 more source

Tropospheric trace gases at Bremen measured with FTIR spectrometry

Journal of Environmental Monitoring, 2009
The total column densities of acetylene (C(2)H(2)), carbon monoxide (CO), hydrogen cyanide (HCN) and ethane (C(2)H(6)) measured in Bremen (Germany, 53.107 degrees N, 8.854 degrees E) were compared with data from Mace Head/Ireland (MHD) and GEOS-Chem model simulations.
O R, Salau, T, Warneke, J, Notholt, C, Shim, Q, Li, Y, Xiao   +5 more
openaire   +2 more sources