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Record 16 of 5648
Self-Calibration and Laser Energy Monitor Validations for a Double-Pulsed 2-Micron CO2 Integrated Path Differential Absorption Lidar Application
External Online Source: doi:10.1364/AO.54.007240
Author and Affiliation:
Refaat, Tamer F.(NASA Langley Research Center, Hampton, VA, United States)
Singh, Upendra N.(NASA Langley Research Center, Hampton, VA, United States)
Petros, Mulugeta(NASA Langley Research Center, Hampton, VA, United States)
Remus, Ruben(NASA Langley Research Center, Hampton, VA, United States)
Yu, Jirong(NASA Langley Research Center, Hampton, VA, United States)
Abstract: Double-pulsed 2-micron integrated path differential absorption (IPDA) lidar is well suited for atmospheric CO2 remote sensing. The IPDA lidar technique relies on wavelength differentiation between strong and weak absorbing features of the gas normalized to the transmitted energy. In the double-pulse case, each shot of the transmitter produces two successive laser pulses separated by a short interval. Calibration of the transmitted pulse energies is required for accurate CO2 measurement. Design and calibration of a 2-micron double-pulse laser energy monitor is presented. The design is based on an InGaAs pin quantum detector. A high-speed photo-electromagnetic quantum detector was used for laser-pulse profile verification. Both quantum detectors were calibrated using a reference pyroelectric thermal detector. Calibration included comparing the three detection technologies in the single-pulsed mode, then comparing the quantum detectors in the double-pulsed mode. In addition, a self-calibration feature of the 2-micron IPDA lidar is presented. This feature allows one to monitor the transmitted laser energy, through residual scattering, with a single detection channel. This reduces the CO2 measurement uncertainty. IPDA lidar ground validation for CO2 measurement is presented for both calibrated energy monitor and self-calibration options. The calibrated energy monitor resulted in a lower CO2 measurement bias, while self-calibration resulted in a better CO2 temporal profiling when compared to the in situ sensor.
Publication Date: Aug 20, 2015
Document ID:
20160010657
(Acquired Aug 31, 2016)
Subject Category: EARTH RESOURCES AND REMOTE SENSING
Report/Patent Number: NF1676L-20889
Document Type: Journal Article
Publication Information: Applied Optics (ISSN 1559-128X); Volume 54; No. 24
Contract/Grant/Task Num: WBS 478643.02.09.02.02
Financial Sponsor: NASA Langley Research Center; Hampton, VA, United States
Description: 12p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: CALIBRATING; PULSED LASERS; CARBON DIOXIDE; OPTICAL RADAR; CARBON DIOXIDE CONCENTRATION; DIFFERENTIAL ABSORPTION LIDAR; ATMOSPHERIC COMPOSITION; IN SITU MEASUREMENT; TRANSMITTERS; PULSES; GROUND TESTS; OPTICAL THICKNESS; INDIUM GALLIUM ARSENIDES
Availability Source: Other Sources
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