Author: Publisher: DIANE Publishing
ISBN: 1428996176
Category :
Languages : en
Pages : 155
Book Description
Advanced atmospheric water vapor DIAL detection system
Author: Publisher: DIANE Publishing
ISBN: 1428996176
Category :
Languages : en
Pages : 155
Book Description
Monthly Catalog of United States Government Publications
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 148
Book Description
Scientific and Technical Aerospace Reports
Author: Monitoring Atmospheric Water Vapour
Author: Niklaus KämpferPublisher: Springer Science & Business Media
ISBN: 1461439086
Category : Technology & Engineering
Languages : en
Pages : 325
Book Description
Atmospheric water plays a key role in climate. Water vapour is the most important greenhouse gas and its condensed forms exert a profound influence on both incoming solar and outgoing infrared radiation. Unfortunately, accurate, height-resolved global-scale measurements of atmospheric humidity are difficult to obtain. The change in concentration of five orders of magnitude form the ground to the stratosphere means there is no standard instrument that will measure everywhere. This has led to different measuring techniques, all with strengths and weaknesses. This book assesses all presently available techniques that are used in monitoring networks. Special weight is given to presenting the different technical concepts, the accuracy of different sensor types, addresses calibration issues and retrieval aspects.
Development and analysis of diode laser ns-MOPA systems for high peak power application
Author: Thi Nghiem VuPublisher: Cuvillier Verlag
ISBN: 3736984804
Category : Science
Languages : en
Pages : 139
Book Description
This work aims at designing and characterizing diode laser based master oscillator power amplifier (MOPA) systems, which are targeted to be implemented into micro light detection and ranging (LIDAR) or differential absorption LIDAR (DIAL) systems for water vapor and aerosol detections. These light sources operate in the ns-pulse regime at a repetition rate of 25 kHz, leading to a resolution in the meter range in an altitude of 6 km. The monolithic MOPA, where Master Oscillator (MO) and Power Amplifier (PA) are integrated on one single chip, operates at 1064 nm wavelength. A peak power of 16.3 W with a pulse width of 3 ns was obtained. A spectral linewidth of about 150 pm and a side mode suppression ratio (SMSR) of 30 dB was observed. A ratio of 9% between the amplified spontaneous emission (ASE) and the laser was estimated. These spectral properties fulfill the requirements for aerosol detection. The hybrid MOPA systems have separate chips for MO and PA. Different hybrid MOPA systems provide a stabilized wavelength at 1064 nm, a tunable wavelength around 975 nm and a dual wavelength around 964 nm. They therefore enable to detect a well-defined absorption line, scan over absorption line and switch between on/off line in DIAL applications, respectively. Their spectral linewidth is below 10 pm, limited by the resolution of the spectrum analyzer. An SMSR of more than 50 dB for the MO and of more than 37 dB for the whole MOPA was reached. A ratio between ASE and laser below 1% was estimated. These spectral properties meet the requirements for water vapor absorption lines detection at atmospheric condition. Diode laser based MOPA systems were therefore proven to be potential light sources for micro-pulse-LIDAR systems – the basis for a new generation of ultra-compact, low-cost systems.
Optical Engineering
Author: Publisher:
ISBN:
Category : Optical instruments
Languages : en
Pages : 748
Book Description
Publishes papers reporting on research and development in optical science and engineering and the practical applications of known optical science, engineering, and technology.
Characterization of advanced avalanche photodiodes for water vapor lidar receivers
Author: Publisher: DIANE Publishing
ISBN: 1428996214
Category :
Languages : en
Pages : 62
Book Description
NASA Langley Scientific and Technical Information Output: 1999
Author: NASA Langley Scientific and Technical Information Output 2000
Author: Nineteenth International Laser Radar Conference
Author: Upendra N. SinghPublisher:
ISBN:
Category : Atmosphere
Languages : en
Pages : 602
Book Description
This publication contains extended abstracts of papers presented at the Nineteenth International Laser Radar Conference, held at Annapolis, Maryland, July 6-10, 1998; 260 papers were presented in both oral and poster sessions. The topics of the conference sessions were Aerosol Clouds, Multiple Scattering; Tropospheric Profiling, Stratospheric/Mesospheric Profiling; Wind Profiling; New Lidar Technology and Techniques; Lidar Applications, Including Altimetry and Marine; Space and Future Lidar; and Lidar Commercialization/Eye Safety. This conference reflects the breadth of research activities being conducted in the lidar field. These abstracts address subjects from lidar-based atmospheric investigations, development of new lasers and lidar system technology, and current and future space-based lidar systems.