NDLI: A real-time data acquisition system for the NASA Airborne Laser Polarimeter Sensor (ALPS)

Content Provider	IEEE Xplore Digital Library
Author	Elman, G.C. Kalishoven Jr., J.E. Dabney, P.W.
Copyright Year	1989
Description	Author affiliation: Ressler Assoc. Inc., Laurel, MD, USA (Elman, G.C.)
Abstract	An ASYST-based real-time data-acquisition system for measurement of the depolarization properties of various materials on the Earth's surface is described. The ALPS system is flown in a NASA P3 and uses an Nd:YAG laser pulsed at 20 Hz to irradiate the Earth's surface. The ALPS data-acquisition system measures the multispectral reflected energy of the laser with 12 photomultiplier tubes, whose outputs are digitized with a charge-integrating A/D (analog/digital) converter. An IBM PC/AT configured with an Intel Inboard 386 and a Kinetic Systems 2926 PC interface with direct memory access card serves as the system controller. Between each pair of laser pulses (50 ms) the software must read the reflected laser signal, the dark current background level, and various items of housekeeping information and these store this data in a RAM disk. The data are displayed for analysis and permanently stored in the AT's hard disk when the aircraft is turning for its next acquisition pass. The ALPS ASYST software is completely menu-driven and controls all data-acquisition, processing, analysis, and database functions.
Starting Page	81
Ending Page	85
File Size	413111
Page Count	5
File Format	PDF
DOI	10.1109/IMTC.1989.36825
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1989-04-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Real time systems Data acquisition NASA Earth Optical pulses Optical materials Surface emitting lasers Current measurement Energy measurement Photomultipliers
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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