Remote Sensing

Short-range remote spectral sensor using mid-infrared semiconductor lasers with orthogonal code-division multiplexing approach

[+] Author Affiliations
Z. Morbi, D. B. Ho, H.-W. Ren, H. Q. Le, S. S. Pei

University of Houston, Department of Electrical and Computer Engineering and Space Vacuum Epitaxy Center, 4800 Calhoun, Houston, Texas?77204-4005 E-mail: hqle@uh.edu

Opt. Eng. 41(9), 2321-2337 (Sep 01, 2002). doi:10.1117/1.1497614
History: Received Oct. 29, 2001; Revised Feb. 22, 2002; Accepted Feb. 22, 2002; Online September 04, 2002
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Demonstration of short-range multispectral remote sensing, using 3 to 4-μm mid-infrared Sb semiconductor lasers based on code-division multiplexing (CDM) architecture, is described. The system is built on a principle similar to intensity-modulated/direct-detection optical-CDMA for communications, but adapted for sensing with synchronous, orthogonal codes to distinguish different wavelength channels with zero interchannel correlation. The concept is scalable for any number of channels, and experiments with a two-wavelength system are conducted. The CDM-signal processing yielded a white-Gaussian-like system noise that is found to be near the theoretical level limited by the detector fundamental intrinsic noise. With sub-mW transmitter average power, the system was able to detect an open-air acetylene gas leak of 102STPft3/hr from 10-m away with time-varying, random, noncooperative backscatters. A similar experiment detected and positively distinguished hydrocarbon oil contaminants on water from bio-organic oils and detergents. Projection for more advanced systems suggests a multi-kilometer-range capability for watt-level transmitters, and hundreds of wavelength channels can also be accommodated for active hyperspectral remote sensing application. © 2002 Society of Photo-Optical Instrumentation Engineers.

© 2002 Society of Photo-Optical Instrumentation Engineers

Citation

Z. Morbi ; D. B. Ho ; H.-W. Ren ; H. Q. Le and S. S. Pei
"Short-range remote spectral sensor using mid-infrared semiconductor lasers with orthogonal code-division multiplexing approach", Opt. Eng. 41(9), 2321-2337 (Sep 01, 2002). ; http://dx.doi.org/10.1117/1.1497614


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