Results 201 to 210 of about 2,030,862 (242)
Some of the next articles are maybe not open access.
Sensitivity of coherent rage-resolved differential absorption lidar
Applied Optics, 1984A 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
Analysis of differential absorption lidar from the Space Shuttle
Applied Optics, 1978A parametric analysis of the Shuttle-borne differential absorption lidar concept for the measurement of atmospheric trace constituent profiles in the nadir viewing mode is presented. The criterion of an optimum constituent optical depth is developed and applied to generate estimates of range resolved measurement errors.
E E, Remsberg, L L, Gordley
openaire +2 more sources
Differential absorption lidar system for routine monitoring of tropospheric ozone
Applied Optics, 1994A differential absorption lidar system for routine profiling of tropospheric ozone for daytime and nighttime operation is described. The system uses stimulated Raman scattering in hydrogen and deuterium of 266-nm radiation from a quadrupled Nd:YAG laser.
Sunesson, JA, Apituley, A, Swart, DPJ
openaire +3 more sources
CO 2 coherent differential absorption lidar
SPIE Proceedings, 2000Experimental 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
Optimal bandwidth for topographical differential absorption lidar detection
Applied Optics, 1996A 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
Multiple wavelength differential absorption lidar evaluation
Acta Physica Hungarica, 1984Algorithms are shown for the interpretation and evaluation of multiple wavelength differential absorption lidar data for cases when only limited information is available about the molecular components present prior to the measurement. Experimental data are modeled by computer simulation of measurement, errors and reliability of the measurements are ...
T. I. Tarnóczi, P. Richter
openaire +1 more source
Laser prf considerations in differential absorption lidar applications
Applied Optics, 1983Laser 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
Numerical simulation for differential absorption lidar system
SPIE Proceedings, 2007In 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
Doppler spectral scanning differential absorption lidar
SPIE Proceedings, 2002Preliminary experiments toward the implementation of Doppler spectral scanning differential absorption lidar (DSS DIAL) are described. In separate tests, CO2 laser pulses were reflected from either a ground-based retroreflector (36-km round-trip distance) or a retroreflector on the GEOS-3 satellite (approximately 2000-km round-trip distance).
Bradley M. Jost +4 more
openaire +1 more source
Water vapor micropulse differential absorption lidar
SPIE Proceedings, 1999By 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.
Choonghoon Oh +6 more
openaire +1 more source