Mobile differential absorption lidar (DIAL) systems have been used for the last two decades. The lidar group in Lund has performed many DIAL measurements with a mobile lidar system which was first described in 1987. This report describes how that system w...

A measurement of ambient nitrogen dioxide concentration by an air quality monitoring station, and a visible lidar system using a differential absorption lidar (DIAL) technique are performed. The agreement between measured values is within experimental error of the lidar results for average wind ...

from a lidar system for measurements of ozone profiles in the troposphere ... and the two output wavelengths are generated and ... recorder/photon counting system (Licel). 1 .�e7 ... M. L. White, Differential Absorption Lidar Systems at JPL - ...

An extension of the Kalman-Bucy algorithm for on-line estimation of multimaterial path-integrated concentration from multiwavelength differential absorption lidar time series data is presented in which the system model covariance is adaptively estimated from the input data. Performance of the filter is compared with that of a ...

profiles obtained by differential absorption lidar (DIAL) analysis. ... Differential absorption lidars (DIAL) have been and continue to be widely used for the ...

In this study, we perform wind observation in the lower troposphere using the incoherent Doppler wind lidar that we previously developed for the upper troposphere and stratosphere. This Doppler lidar uses both slopes of the iodine absorption spectrum, and the Doppler shift is obtained from the ratio of the two ...

The design and operation of a differential absorption lidar system capable of remotely measuring the

A ground-based differential absorption lidar (DIAL) system is described which has been developed for

A differential absorption and scattering lidar that measures hydrogen chloride with a sensitivity of

A parametric analysis of the Shuttle-borne differential absorption lidar concept for the measurement

... Title : NONLINEAR RESONANT ABSORPTION EFFECTS ON THE DESIGN OF RESONANCE FLUORESCENCE LIDARS AND LASER GUIDE ...

Many studies recently have investigated the active remote sensing of atmospheric greenhouse gases, such as CO2 and CH4, by means of differential absorption lidar systems. According to them, the accuracy of the laser wavelengths used is one of the most important issues of this technique in terms of conformance to the high measurement sensitivity ...

The University of Wisconsin high spectral resolution lidar (HSRL) measures optical properties of the

A small compact ozone differential absorption lidar capable of being deployed on a small aircraft or

Development of advanced differential absorption lidar (DIAL) receivers is very important to increase

The theory of differential absorption lidar measurements for lines with a Voigt profile is given and

Page 1. i Modeling Multiple Scattering and Absorption for a Differential Absorption LIDAR System by Daniel D. Blevins BS ...

For the first time, height profiles of the extinction-to-backscatter ratio (lidar ratio) of desert dust particles were simultaneously measured at 355 and 532 nm. The observations were performed with an advanced Raman lidar during two long-range Saharan dust outbreaks at Leipzig, Germany (51.3�N, 12.4�E), in August and October 2001. ...

An analysis of two sets of atmospheric optical and supporting meteorological data has been performed. The first data set was taken by an airborne differential absorption lidar (DIAL) system. From this data set, vertical water vapor density profiles were e...

Summarized here are the results of airborne water vapor measurements in the lower middle and upper troposphere using the Differential Absorption Lidar (DIAL) technique in the near infrared. The measurements were performed in July 1990 in Southern Bavaria ...

To perform daytime measurements of the density and temperature by Rayleigh lidar, it is necessary to

A high-performance airborne water vapor differential absorption lidar has been developed during the past years. This system uses a four-wavelength/three-absorption line measurement scheme in the 935 nm H2O absorption band to cover the whole troposphere and lower stratosphere simultaneously. ...

A search for atmospheric atomic mercury as a possible tracer gas for geothermal energy exploration was performed in three Icelandic geothermal fields using differential absorption lidar technique. Contrary to expectations, concentrations basically only at the Atlantic background value of about 2 ng/m{sup 3} were found in Iceland.

The WAter vapour Lidar Experiment in Space (WALES) mission aims at providing water vapour profiles with high accuracy and vertical resolution through the troposphere and the lower stratosphere on a global scale using an instrument based on Differential Absorption Lidar (DIAL) observation technique, and mounted on an Earth orbiting ...

Lidar monitoring of the gaseous molecules in atmosphere can be used for concentration measurements of the toxic pollutants in air of the urban and industrial regions. Such a concentration study in the multi-components gaseous mixture by lidar technique is a complex problem in atmospheric pollution monitoring. The differential ...

Measurement Description: The UV Differential Absorption Lidar (DIAL) system is used to measure aerosol, cloud, and ozone profiles above the aircraft [Browell ...

Airborne UV Differential Absorption Lidar (DIAL): Measuring Ozone and Aerosols in the Atmosphere. Figure 1: The Electromagnetic Spectrum The ozone hole ...

Sep 9, 2011 ... DIAL Ops. The NASA Langley airborne Differential Absorption Lidar (DIAL) uses ultraviolet (UV) DIAL wavelengths of 288 and 300 nm for the ...

Computer hardware and software of the NASA multipurpose differential absorption lidar (DIAL) sysatem

By combining the capability of a differential absorption lidar (DIAL) and the excellent characteristics of a micro pulse lidar (MPL) we have designed and tested a micro pulse DIAL system, which could be operated from the ground or airborne platform, to monitor the atmospheric water vapor mixing ratio. To maintain the compact and rugged ...

The performance of a spaceborne temperature lidar based on the pure rotational Raman (RR) technique in the UV has been simulated. Results show that such a system deployed onboard a low-Earth-orbit satellite would provide global-scale clear-sky temperature measurements in the troposphere and lower stratosphere with precisions that satisfy World ...

The performance of a spaceborne temperature lidar based on the pure rotational Raman (RR) technique in the UV has been simulated. Results show that such a system deployed onboard a low-Earth-orbit satellite would provide global-scale clear-sky temperature measurements in the troposphere and lower stratosphere with precisions that satisfy World ...

The GSFC pressure-temperature lidar is a differential absorption lidar operating in the oxygen A band absorption region (760 to 770 nm), and utilizes two tunable pulsed alexandrite lasers. For obtaining temperature measurements with an accuracy of less th...

The lidar group in Lund has performed many DIAL measurements with a mobile lidar system that was first described in 1987. The lidar system is based on a Nd:YAG-pumped dye laser. During the last few years the lidar group has focused on fluorescence imaging...

including phytoplankton carbon biomass and physiology ... Characterization of algal absorption spectra, since physiology is best ...

CO{sub 2} differential absorption lidar (DIAL) performance can be adversely affected by the ambient atmosphere between the laser transmitter and the target through a number of different processes. This work addresses two sources of atmospheric interference with multispectral CO{sub 2} DIAL measurements: effects due to beam propagation ...

Shuttle lidar measurements of magnesium-ion (Mg+) number density in the ionosphere (80-500 km) have been numerically simulated. A set of recently defined system parameters are used to assess the system performance. These simulations take into account the saturation effect of atomic absorption due to the high intensity of the laser, ...

We introduce a new approach to coherent lidar range-Doppler sensing by utilizing random-noise illuminating waveforms and a quantum-optical, parallel sensor based on spatial-spectral holography (SSH) in a cryogenically cooled inhomogeneously broadened absorber (IBA) crystal. Interference between a reference signal and the lidar return in the spectrally ...

We introduce a new approach to coherent lidar range-Doppler sensing by utilizing random-noise illuminating waveforms and a quantum-optical, parallel sensor based on spatial-spectral holography (SSH) in a cryogenically cooled inhomogeneously broadened absorber (IBA) crystal. Interference between a reference signal and the lidar return in the spectrally ...

The lidar systems contribute with privileged information to study environmental pollution due to its capacity to discriminate different atmospheric parameters in time and space. In this work, three of those system were developed at CEILAP laboratory in Argentina (34� 33' S, 58� 30' W): 1) a Multiwavelength lidar to characterized the atmospheric ...

The characteristics of the lidar reflectance of the Earth's surface is an important issue for the IPDA lidar technique (integrated path differential absorption lidar) which is the proposed method for the spaceborne measurement of atmospheric carbon dioxide within the framework of ESA's A-SCOPE project. Both, the ...

The Differential Absorption Lidar (DIAL) method is reviewed and performance evaluations are presented for a NO2 detection system. Discussions on the preferred wavelengths for candidate gases, and a review of a new laser radar DIAL performance equation are presented. Applications in the areas of drug interdiction, ...

of coherent Doppler lidar in the weak signal regime was determined ... of coherent Doppler lidar for a shuttle mission with various scanning geometries ...

SRI International designed and constructed a DIfferential Absorption Lidar (DIAL) to provide EPRI with a mobile field system for remote measurements of SO/sub 2/, NO/sub 3/, and O/sub 3/. After field testing the lidar was prepared for the sytem calibration testing where lidar measurements were compared to in situ ...

The ambient atmosphere between the laser transmitter and the target can affect CO{sub 2} differential absorption lidar (DIAL) measurement sensitivity through a number of different processes. In this work, we will address two of the sources of atmospheric interference with CO{sub 2} DIAL measurements: effects due to beam propagation through atmospheric ...

The proposed effort extends the micro-lidar technology to compact tunable transmitters suitable for measurements of H2O vapor by Differential Absorption ...

We have developed a lidar technique for measuring the tropospheric C02 concentrations as a candidate

Airborne Differential Absorption Lidar (DIAL) Field Experiment Examples: Example Aerosol, Ozone, and Water Vapor Images ...

Airborne Differential Absorption Lidar (DIAL) Field Experiment Examples: Example Aerosol, Ozone, and Water Vapor Images ...

... range and chem-bio agent detection limits of direct detection LWIR differential absorption LIDAR systems * Standoff range: ~ 2x increase for fixed ...

Aug 4, 2011 ... In the DIAL technique, the gas concentration profile is determined by analyzing the lidar backscatter signals for laser wavelengths tuned ...

Mar 29, 2011 ... Tom McGee, Don Silbert. -Combines Rayleigh Lidar, Differential Absorption Lidar (DIAL), and Raman DIAL -Zenith viewing ...

DISSERTATIONS. 6. A High Spectral Resolution. Lidar Based on. Absorption. Filter . Paivi Piironen. ACADEMIC. DISSERTATION. To be present, with the permission ...

The Lidar Atmospheric Sensing Experiment will be performed aboard an ER-2 aircraft; the lidar system

... characterization of atmospheric and terrain backscatter for input to performance studies for future airborne DIAL and Doppler lidar systems; Real ...

� , due to uncertainties in the ozone absorption cross-section; .... in ozone absorption cross-section, and imperfection of the dead-time and SIB ...

Comparative study is performed for a mid-infrared differential absorption lidar system with different wavelengths around 1.6 �m and 2 �m for remote sensing of green-house effect gas CO2. Simulation based on lidar equations is performed for estimating detectable range and detectable ...

We discuss the development of a frequency-agile receiver for CO(2) laser-based differential absorption lidar (DIAL) systems. The receiver is based on the insertion of a low-order tunable etalon into the detector field of view. The incorporation of the etalon into the receiver reduces system noise by decreasing the instantaneous spectral bandwidth of the IR ...

A formalism for the error treatment of lidar ozone measurements with the Raman differential absorption lidar technique is presented. In the presence of clouds wavelength-dependent multiple scattering and cloud-particle extinction are the main sources of systematic errors in ozone measurements and necessitate a correction of the ...

A lidar-based satellite instrument for global observations of atmospheric methane is foreseen whose expected performance and technical feasibility are currently investigated in planning phase 0/A. Methane is, after carbon dioxide, the second most important greenhouse gas, whereby its anthropogenic emissions are much more uncertain. In addition, climate ...

Remote detection of chemicals using LIDAR (Light Detection and Ranging) utilizing DIAL (Differential Absorption LIDAR) is now a standard detection technique for both military and civilian activities. We have developed a novel nonlinear optical phase conju...

This report describes the background theory, experimental techniques, and results of research relating to lidar polarization, scattering, and absorption effects using the GL/OP low altitude lidar system. The work, which is aimed at improving the understan...

This paper presents cirrus cloud observations made with the High Spectral Resolution Lidar (HSRL) and the Volume Imaging Lidar (VIL). The HSRL was redesigned to use an iodine absorption filter in place of the Fabry-Perot etalon that was used for spectral ...

A case study is presented of 6.5 h of simultaneous colocated stratospheric Differential Absorption Lidar (DIAL) measurements of ozone concentration and Rayleigh-Mie Doppler (RD) lidar measurements of horizontal wind velocity from the Observatoire de Haute...

The Lidar Atmospheric Sensing Experiment (LASE) Instrument is the first fully-engineered, autonomous Differential Absorption Lidar (DIAL) System for the measurement of water vapor in the troposphere (aerosol and cloud measurements are included). LASE uses...

The present volume on lidar for remote sensing discusses lidar system techniques for remote sensing of atmospheric pollution, airborne and surface-based lidar for environmental sensing of water and oceans, Doppler lidar for wind sensing and related measurement, aerosol measurements using lidar, ...

Differential absorption lidar and Raman lidar have been applied to the range-resolved measurements of water vapor density for more than 20 years. During this period, there have been considerable advances in laser and lidar technology, as well as in the understanding of the factors required to optimize both ...

The Air Force Research Laboratory (AFRL) Active Remote Sensing Branch has developed the Laser Airborne Remote Sensing (LARS) system for chemical detection using the differential absorption lidar (DIAL) technique. The system is based on a high-power CO2 laser which can use either the standard 12C16O2 or the 13C16O2 carbon dioxide isotopes as the lasing ...

A ground-based differential Absorption Lidar (DIAL) system has been implemented at CEILAP laboratory, located in the Buenos Aires industrial suburbs, The goal was to perform measurements of the stratospheric ozone layer. Since early 199 systematic measurements of zone concentration profiles from approximately 18 to 35 km altitude are ...

The development of eye-safe, solid-state Lidar systems is discussed, with an emphasis on Coherent Doppler Lidar for Atmospheric Wind Measurements. The following subject areas are covered: tunable Ho DIAL (Differential Absorption Lidar)/lidar atmospheric m...

The design and preliminary tests of an automated differential absorption lidar (DIAL) that profiles water vapor in the lower troposphere are presented. The instrument, named CODI (for compact DIAL), has been developed to be eye safe, low cost, weatherproof, and portable. The lidar design and its unattended operation are described. ...

The authors are developing 2--100 kHz repetition rate CO{sub 2} lasers with milliJoule pulse energies, rapid acousto-optic tuning and isotopic gas mixes, for Differential Absorption LIDAR (DIAL) applications. The authors explain the tuning method, which uses a pair of acousto-optic modulators and is capable of random access to CO{sub 2} laser lines at ...

This report describes the results of investigations performed by the Georgia Tech Research Institute

Lidar measurements of ozone and water vapor concentrations were performed during several field experiments in 1980-1981 by means of the differential absorption laser technique. Profiles up to 26 km for ozone and up to 9 km for water vapor are presented. Also, a lidar survey of aerosol layers ranging from 12 to 23 ...

Active remote sensing using lidar shows high potential for the measurement of atmospheric greenhouse gases like carbon dioxide or methane from spaceborne platforms. Due to the weak atmospheric backscatter in the near IR the IPDA lidar (Integrating Path Differential Absorption Lidar) technique is preferred over the ...

Differential Absorption Lidar (DIAL) Investigators: Edward Browell (PI), Johnathan Hair (Co-PI), Syed Ismail

A near infrared differential absorption lidar technique is developed using atmospheric oxygen as a tracer for high resolution vertical profiles of pressure and temperature with high accuracy. Solid-state tunable lasers and high-resolution spectrum analyze...

We are seeking to develop a reliable methodology for multi-chemical detection and discrimination based upon multi-wavelength differential absorption lidar measurements. In this paper, we summarize some preliminary results of our efforts to devise suitable...

The clouds play a significant role in the atmosphere particularly in the determination of the radiant balance. Since their type, structure and height considerable influence the transmission, absorption and re-radiation of the IR radiation they are of great importance for the local meteorology and the global climatology. In small spatial scales (micro- and meso- ones) the ...

... This is done by propagating a known output signal, and measuring ... optical signal will attenuate exponentially because of absorption and scattering. ...

The system control and signal conditioning electronics of the NASA three laser airborne differential

The measurement sensitivity of CO{sub 2} differential absorption lidar (DIAL) can be affected by a number of different processes. The authors have previously developed a Huygens-Fresnel wave optics propagation code to simulate the effects of two of these processes: effects caused by beam propagation through atmospheric optical turbulence and effects caused ...

... Accession Number : ADA359106. Title : Performance Analysis of a Multistatic Coherent Doppler Lidar. Descriptive Note : Doctoral thesis. ...

... Contract N00014-90-C-0215 Multiangle Lidar Performance in the Presence of Horizontal Inhomogeneities in Atmospheric Extinction and Scattering ...

Recently measured properties of water vapor (H2O) absorption lines have been used in calculations to

Both lasers are pulsed at a absorption ... CO2 absorption profiles to 5 km, and relative errors of 1% at. <7 km height. ...

Active remote sensing using lidar appears to be very attractive for the measurement of atmospheric greenhouse gases like carbon dioxide from spaceborne platforms. Feasibility studies are currently being performed to demonstrate the required measurement performance. Due to the high precision required (less than 0.3 %) for climate ...

Lidar monitoring of surface waters has usually been applied to fluorescent and nonfluorescent soluble chemicals can be investigated. Two signals have to be measured, the total fluorescence lidar intensity L, which is characterized by long path-lengths of the laser radiation in the water column, and the fluorescence F, which originates from the first layers ...

The lidar remote sensing techniques are powerful for monitoring of gaseous toxic species in atmosphere over wide areas. The paper presented describes design, development and field testing of Mobile Lidar System (MLS) based on utilization of Differential Absorption Lidar (DIAL) technique. The activity is ...

Sodium density distributions were measured over more than 20 nights since Jul. 1991 at Tokyo Metropolitan University. Our sodium lidar specifications are shown. The lidar consists of a dye laser that is pumped by a pulsed Nd:YAG laser. The dye laser is tuned to the D2 resonant absorption line of Na at the wavelength of 589 nm. A small ...

The Convective and Orographically-induced Precipitation Study (COPS) has the aim to advance the quality of forecasts of orographically-induced precipitation in complex terrain. COPS is a Research and Development Project of the World Weather Research Program and considered to be one of the largest field campaigns on quantitative precipitation forecasting that has been performed ...

The design of the 532 and 1064nm wavelength atmosphere lidar channels of the Geoscience Laser Altimeter System on the ICESat spacecraft is described. The lidar channel performance per on orbit measurements data will be presented.

A method for remote sensing of total precipitable water vapor using water vapor absorption band at 0.94 ?m was previously developed for continental regions. Here we apply a similar technique for ocean areas over the glint region. The glint, or oceanic specular reflection, has a high value of surface reflectance and thus, can work as well as or better than applications over ...

Lidar Light Detection and Ranging is regarded as an innovative component of the global observing system It offers the possibility to directly sample the four-dimensional variability of the atmosphere with unprecedented accuracy and spatial resolution In Europe space-borne lidar systems have been the subject of extensive investigations since mid 1970 s ...

With atmospheric carbon dioxide concentrations rising steadily, investigations into locations and magnitudes of the sources, sinks and net surface fluxes are of increasing importance. Active space-borne measurement systems such as LIDAR offer one potential technique to derive global, near-surface concentrations. However, significant instrumental challenges need to be overcome ...

Methane is the third most important greenhouse gas in the atmosphere after water vapour and carbon dioxide. A major handicap to quantify the emissions at the Earth's surface in order to better understand biosphere-atmosphere exchange processes and potential climate feedbacks is the lack of accurate and global observations of methane. Space-based integrated path differential ...

... The SNR models give performance and range accuracy estimates for direct detection and coherent Doppler lidar systems, plus estimates of the ...