NDLI: Dial with heterodyne detection including speckle noise: aircraft/shuttle measurements of o3, h2o, and nh3 with pulsed tunable co2lasers

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Dial with heterodyne detection including speckle noise: aircraft/shuttle measurements of o3, h2o, and nh3 with pulsed tunable co2lasers

Content Provider	NASA Technical Reports Server (NTRS)
Author	Brockman, P. Staton, L. D. Bair, C. H. Hess, R. V.
Copyright Year	1980
Description	A parametric analysis of DIAL sensitivity with heterodyne detection is presented and comparisons with direct detection are discussed. Examples are given for monitoring vertical distributions of O3, H2O, and NH3 using a ground-, aircraft-, or shuttle-based pulsed tunable CO2 laser DIAL system. Results indicate that maximum sensitivity at minimum laser energy per measurement requires multiple pulse operation with the energy per pulse selected so that the measured photon rate is approximately equal to the detector IF bandwidth. Measurement sensitivities can be maximized and interference effects minimized by fine adjustment of measurement frequencies using the tunability of high pressure lasers. The use of rare isotope lasers minimizes loss due to CO2 atmospheric absorption.
File Size	436155
Page Count	11
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19800021191
Archival Resource Key	ark:/13960/t0qr9ms5g
Language	English
Publisher Date	1980-08-01
Access Restriction	Open
Subject Keyword	Lasers And Masers Airborne Equipment Atmospheric Composition Electromagnetic Absorption Signal To Noise Ratios Signal Detectors Tunable Lasers Heterodyning Speckle Patterns Random Errors Pulsed Lasers Optical Radar Carbon Dioxide Lasers Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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