GLTRS--Glenn
TITLE AND SUBTITLE:
RF Modulated Fiber Optic Sensing Systems and Their Applications

AUTHOR(S):
Grigory Adamovsky and John G. Eustace

REPORT DATE:
September 1992

FUNDING NUMBERS:
WU-505-62-50

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Lewis Research Center
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-7231

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, D.C. 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-105801

SUPPLEMENTARY NOTES:
Prepared for the SPIE's International Symposium OE/Fibers '92 sponsored by the International Society for Optical Engineering, Boston, Massachusetts, September 8-11, 1992, Grigory Adamovsky, NASA Lewis Research Center, Cleveland, Ohio;
John G. Eustace, John Carroll University, University Heights, Ohio. Responsible person, Grigory Adamovsky, (216) 433-3736.

ABSTRACT:
A fiber optic sensing system with an intensity sensor and an RF modulated source has been shown to have sensitivity and resolution much higher then a comparable system employing low modulating frequencies or DC mode of operation. Also the RF modulation with an appropriate configuration of the sensing system provides compensation for the unwanted intensity losses. This paper describe the basic principles and applications of a fiber optic sensing system employing an RF modulated source. In addition the paper discusses various configurations of the system itself, its components, and modulation and detection schemes. Experimental data are also presented.


SUBJECT TERMS:
Fiber optics; Sensors; RF modulation

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