NDLI: Ingaassb detectors' characterization for 2-micron co2 lidar/dial applications

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Ingaassb detectors' characterization for 2-micron co2 lidar/dial applications

Content Provider	NASA Technical Reports Server (NTRS)
Author	Abedin, M. Nurul Koch, Grady J. Singh, Upendra N. Refaat, Tamer F.
Copyright Year	2003
Description	Recent interest in monitoring atmospheric CO2 focuses attention on infrared remote sensing using the 2-micron lidar/differential absorption lidar (DIAL) technique. Quantum detectors are critical components in this technique, and many research efforts concentrate on developing such devices for the 2-micron wavelength. Characterization results of InGaAsSb quantum detectors for the 2-micron wavelength range are presented, including experimental setup and procedure. Detectors are prototype devices manufactured by using separate absorption and multiplication (SAM) structures. Characterization experiments include V-I measurements, spectral response and its variation with bias voltage and temperature, noise measurements, noise-equivalent-power (NEP) and detectivity calculations, and signal-to-noise ratio (SNR) estimation. A slight increase in the output signal occurred with increased bias voltage and was associated with a noise level increase. Cooling down the detectors reduces noise and shifts the cutoff wavelength to shorter values. Further improvement in the design and manufacturing process, by increasing the device gain and lowering its noise level, is necessary to meet the required CO2 lidar/DIAL specifications.
File Size	1500241
Page Count	32
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20030020485
Archival Resource Key	ark:/13960/t16m86h68
Language	English
Publisher Date	2003-02-01
Access Restriction	Open
Subject Keyword	Electronics And Electrical Engineering Differential Absorption Lidar Infrared Detectors Electric Potential Cooling Signal To Noise Ratios Antimony Remote Sensing Indium Gallium Arsenides Atmospheric Composition Noise Intensity Carbon Dioxide Concentration Prototypes Spectral Sensitivity Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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