Lidar aerosol ratios at 1 and 10 microns

Cattrall, Christopher; Reagan, John A.; Thome, Kurtis J.

doi:10.1117/12.501163

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…In the wavelength ranges of interest in the present paper and in the typical local atmospheric conditions comprising dust, haze or light, smoke, K has a value 8 of approximately 100. For calculations here, K=100 is taken.…”

Section: System Overviewmentioning

confidence: 99%

Parametric Study of Differential Absorption Lidar Systemfor Monitoring Toxic Agents in the Atmosphere

Veerabuthiran¹,

Dudeja²

2007

DSJ

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Differential absorption lidar (DIAL) techniques are advantageously used these days for detecting and monitoring traces of toxic agents located at several kilometer in the atmosphere. A theoretical study has been carried out to simulate the performance of a multiwavelength DIAL sy stem. Clouds of hy drazine, unsy mmetrical dimethy lhy drazine (UDMH), and monomethylhydrazine (MMH), located at various ranges up to 5 km in the atmosphere, have been taken as examples of the toxic agents. It has been shown that a given lidar system cannot detect any of these agents with a specific cloud thickness if the concentration of that agent is below a certain value (N min ). It has also been shown that if the concentration level of a given agent is above a certain value (N max ) at a particular distance, this value cannot be quantified for a given lidar system although the identity as well as the location of that agent can still be determined. Further, for some typical parametric conditions, the required energy levels of the laser to detect specific concentrations of these agents at different distances have been computed. Power levels of the return signals and the SNR values from different ranges have also been calculated for each of these toxic agents for a given value of the laser transmitter energy.

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Section: System Overviewmentioning

confidence: 99%

Parametric Study of Differential Absorption Lidar Systemfor Monitoring Toxic Agents in the Atmosphere

Veerabuthiran¹,

Dudeja²

2007

DSJ

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“…Since values of the optical microphysical parameters and of some of the integral ones, as well, which do not correspond to reality may show up in the course of determining the samples of microphysical parameters by means of random variations, in order to "filter" the sample (i.e., eliminate unrealistic values of these parameters) limits were imposed on the values of the attenuation coefficient ε(0.55), the ratios β π (0.55) ⁄ β π (1.02) of the backscattering coefficients, the Angstrom parameter ν, the ratios of the volume concentrations of particles in the coarse and finely dispersed fractions (for the continental aerosol), the effective size of the aerosol particles, and the fractions in the aerosol. The limitations were chosen on the basis of an analysis of published data systematized in [7] and of data from the global scanning solar photometer monitoring network AERONET [8,9]. The specific limitations are listed in [2].…”

mentioning

confidence: 99%

Regression approach to analyzing the informativity and interpretation of aerosol optical measurements

Lisenko

Kugeiko

2009

J Appl Spectrosc

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A regression approach is proposed for planning aerosol optical experiments and for estimating the potential accuracy of the derived microphysical parameters of atmospheric aerosols taking the features of the apparatus and the available a priori information into account. This method is used to evaluate the informativity of polarization spectronephelometer measurements with respect to the microphysical parameters of continental aerosols. The problem of choosing the most informative aerosol optical characteristics with respect to the mass concentrations of the PM 2.5 and PM 10 respirable fractions is examined and regression equations are derived for determining these concentrations from lidar probe data at wavelengths of 0.355 and 1.064 μm, as well as from reference measurements at 0.37 and 0.98 μm. The theoretical results obtained here are compared with AERONET data.

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Lidar aerosol ratios at 1 and 10 microns

Cited by 2 publications

References 27 publications

Parametric Study of Differential Absorption Lidar Systemfor Monitoring Toxic Agents in the Atmosphere

Parametric Study of Differential Absorption Lidar Systemfor Monitoring Toxic Agents in the Atmosphere

Regression approach to analyzing the informativity and interpretation of aerosol optical measurements

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