Results 161 to 170 of about 207,424 (215)
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Remote sensing of NO using a differential absorption lidar
Applied Optics, 1980Single-ended remote sensing measurements of atmospheric NO have been made using differential absorption of frequency-doubled pulsed CO(2) laser radiation backscattered from topographic targets. Returns were obtained from targets at ranges out to 1.4 km, and significant NO concentrations above ambient were observed over a path which crossed a traffic ...
N Menyuk, D K Killinger
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Demonstration of differential backscatter absorption gas imaging
Applied Optics, 2000Backscatter 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 +2 more
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Continuous-wave differential absorption lidar
Laser and Photonics Reviews, 2015AbstractThis work proves the feasibility of a novel concept of differential absorption lidar based on the Scheimpflug principle. The range‐resolved atmospheric backscattering signal of a laser beam is retrieved by employing a tilted linear sensor with a Newtonian telescope, satisfying the Scheimpflug condition.
Mikkel Brydegaard, Liang Mei
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Differential-absorption photoacoustic imaging
Optics Letters, 2009We 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 +5 more
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Differential absorption lidar signal averaging
Applied Optics, 1988This 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
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Differential absorption lidar sensing of ozone
Proceedings of the IEEE, 1989The 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.
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Analytical differentiation of the differential-absorption-lidar data distorted by noise
Applied Optics, 2002A 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.
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Elemental analysis using differential absorption techniques
Biological Trace Element Research, 1987X-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 +5 more
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Differential absorption of the heme and globin moieties of hemoglobin
The American Journal of Digestive Diseases, 1967Studies 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 +4 more
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Airborne Differential Absorption Lidar
SPIE Proceedings, 1988Airborne 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.
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