Results 171 to 180 of about 877 (209)

CO 2 coherent differential absorption lidar

SPIE Proceedings, 2000
Experimental chemical detection and radiometric results are presented from recent coherent differential absorption lidar (DIAL) ground tests conducted over four kilometer horizontal path at the Air Force Research Laboratory. Heterodyne data was collected simultaneously with the Laser Airborne Remote Sensing direct detection DIAL sensor for comparison ...
Diego F. Pierrottet, Daniel C. Senft
openaire   +1 more source

Sensitivity of coherent rage-resolved differential absorption lidar

Applied Optics, 1984
A range-resolved DIAL (differential absorption lidar) system with heterodyne detection has been developed. A hybrid TEA CO2 laser was employed as the transmitter oscillator, which emitted single-frequency pulses of 140 mJ. The heterodyne receiver, which had a minimum detectable power of 2 × 10−11 W, could detect the echo signals backscattered from ...
T, Fukuda, Y, Matsuura, T, Mori
openaire   +2 more sources

Water vapor differential absorption lidar development and evaluation

Applied Optics, 1979
A ground-based differential absorption lidar (DIAL) system is described which has been developed for vertical range-resolved measurements of water vapor. The laser transmitter consists of a ruby-pumped dye laser, which is operated on a water vapor absorption line at 724.372 nm.
E V, Browell, T D, Wilkerson, T J, McIlrath   +2 more
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Numerical simulation for differential absorption lidar system

SPIE Proceedings, 2007
In the recent years, the most country in the word attach importance to the environmental and the protection of environmental doubly. The differential absorption lidar (DIAL)operating in the infrared wavelengths is a powerful standoff sensor for rapid remote detection of chemical emissions.
WeiRan Wang, ShiRong Yin
openaire   +1 more source

Surface ozone measurements using differential absorption lidar

SPIE Proceedings, 2005
Human activities have been influencing the global atmosphere since the beginning of the industrial era, causing shifts from its natural state. The measurements have shown that tropospheric ozone is increasing gradually due to anthropogenic activities.
Sohan L. Jain, B. C. Arya, Sachin D. Ghude, Arun K. Arora, Randhir K. Sinha   +4 more
openaire   +1 more source

Atmospheric tomography using differential absorption lidar

SPIE Proceedings, 1997
Differential Absorption Lidar measurements from a satellite platform are more complex and can yield more information than terrestrial DIAL measurements because of the significant Doppler shift associated with high satellite velocity relative to the atmosphere. This Doppler effect can be exploited as an extra degree of freedom in matching laser lines to
openaire   +1 more source

The reference range for differential absorption lidars

Optical and Quantum Electronics, 1980
The concept of reference range for lidars is extended to the case of differential absorption lidars. A method for determining the wavelengths of operation, optimal from the point of view of maximum reference range for uniform and non-uniform absorbant distribution, is presented.
P. Richter, I. P�czeli
openaire   +1 more source

Optimal bandwidth for topographical differential absorption lidar detection

Applied Optics, 1996
A detected laser signal backscattered from a tilted target is modeled with a laser-pulse shape as a response of a high-pass filter to an exponential input that describes the gain buildup within the laser cavity before a laser pulse is emitted and a single-pole low-pass RC filter for the electronic amplifier.
openaire   +2 more sources

Laser prf considerations in differential absorption lidar applications

Applied Optics, 1983
Laser pulse repetition frequency (prf) is a major factor in determining the performance of differential absorption lidar (DIAL) systems. The effects of laser prf on concentration measurement accuracy and maximum usable range are quantified. Heterodyne-detection (coherent) and direct-detection (noncoherent) as well as path-averaged and range-resolved ...
openaire   +2 more sources

Differential Absorption Lidar Measurements of Tropospheric Ozone

Laser Applications to Chemical Analysis, 1994
Ozone is one of the most important trace species in the atmosphere and the focus of several important environmental issues. Most ozone resides in the stratosphere where it plays a critical role in protecting the biosphere from harmful solar ultraviolet radiation.
Andrew O. Langford, Michael H. Proffitt
openaire   +1 more source