Results 211 to 220 of about 199,408 (263)

Demonstration of differential backscatter absorption gas imaging

Applied Optics, 2000
Backscatter absorption gas imaging (BAGI) is a technique that uses infrared active imaging to generate real-time video imagery of gas plumes. We describe a method that employs imaging at two wavelengths (absorbed and not absorbed by the gas to be detected) to allow wavelength-differential BAGI.
Thomas J Kulp, P E Powers, Peter E Powers   +2 more
exaly   +3 more sources

Differential-absorption photoacoustic imaging

Optics Letters, 2009
We present differential-absorption photoacoustic imaging, which detects the difference between transient and ground-state absorption, for contrast enhancement based on suppressing undesired objects. Two tubes were imaged. One contains a Pt(II) octaethylporphine (PtOEP) dye solution and serves as an object of interest, while the other contains an IR-783
Sheng-Wen, Huang, Janet F, Eary, Congxian, Jia, Lingyun, Huang, Shai, Ashkenazi, Matthew, O'Donnell   +5 more
openaire   +2 more sources

Differential absorption lidar signal averaging

Applied Optics, 1988
This paper presents experimental results using an atmospheric backscatter dual CO(2) laser differential absorption lidar (DIAL). It is shown that DIAL signals can be averaged to obtain an N(-(1/2)) dependence decrease in the standard deviation of the ratio of backscattered returns from two lasers, where N is the number of DIAL signals averaged, and ...
W B, Grant, A M, Brothers, J R, Bogan
openaire   +2 more sources

Differential absorption lidar sensing of ozone

Proceedings of the IEEE, 1989
The differential absorption lidar (DIAL) technique for deriving O/sub 3/ profiles from lidar measurements is discussed. The US National Aeronautics and Space Administration's airborne DIAL system is described, and examples of a broad range of O/sub 3/ and aerosol measurements are presented from a number of field experiments.
openaire   +1 more source

Differential absorption of the heme and globin moieties of hemoglobin

The American Journal of Digestive Diseases, 1967
Studies were performed in 4 healthy men to determine the intestinal absorption and fecal excretion of the heme and the protein moieties of hemoglobin when hemoglobin was given orally in large amounts. The relatively higher absorption of the protein moiety of hemoglobin was confirmed by a proportionate increase in urinary nitrogen.
K, Tripathy, F T, García, L G, Mayoral, S, Klahr, J, Ghitis   +4 more
openaire   +2 more sources

Analytical differentiation of the differential-absorption-lidar data distorted by noise

Applied Optics, 2002
A method of analytical differentiation is developed for processing differential absorption lidar (DIAL) data. The method is based on simple analytical transformation of the DIAL on and off signal ratio. The derivatives consequently are found for either individual data points or local zones of the measurement range.
openaire   +2 more sources

Elemental analysis using differential absorption techniques

Biological Trace Element Research, 1987
X-ray differential absorption microanalysis is presented as a technique for trace element analysis of hydrated biological specimens of about 0.1-5 μm thickness. For the study of the light elements (Z≲20), the absorption technique minimizes the radiation dose and, thus, damage to such specimens when compared with X-ray fluorescence.
H, Rarback, F, Cinotti, C, Jacobsen, J M, Kenney, J, Kirz, R, Rosser   +5 more
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Coherent differential absorption lidar measurements of CO_2

Applied Optics, 2004
A differential absorption lidar has been built to measure CO2 concentration in the atmosphere. The transmitter is a pulsed single-frequency Ho:Tm:YLF laser at a 2.05-microm wavelength. A coherent heterodyne receiver was used to achieve sensitive detection, with the additional capability for wind profiling by a Doppler technique.
Grady J, Koch, Bruce W, Barnes, Mulugeta, Petros, Jeffrey Y, Beyon, Farzin, Amzajerdian, Jirong, Yu, Richard E, Davis, Syed, Ismail, Stephanie, Vay, Michael J, Kavaya, Upendra N, Singh   +10 more
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Differential absorption displacement transducer

Journal of Physics E: Scientific Instruments, 1985
The operation of a differential absorption displacement transducer based on the optical wedge principle has been successfully demonstrated. The displacement sensitivity of the transducer can be selected anywhere in the range of 0 to 10.35 dB mm-1 by the proper choice of the wavelength.
openaire   +1 more source

Airborne Differential Absorption Lidar

SPIE Proceedings, 1988
Airborne differential absorption lidarPeter RichterTechnical University Budapest, Department of Atomic Physics1521 Budapest, Budafoki ut 8. HungaryABSTRACTThe optical setup of an airborne differential absorption lidar based on optical heterody-ne detection of topographic backscattering of CW tunable CO2 lasers will be shown.
openaire   +1 more source