Comparison of chirped FM/CW and chirped AM/CW fiber optic position sensors for aerospace applications

Leon A. Newman

doi:10.1117/12.141342

9 February 1993 Comparison of chirped FM/CW and chirped AM/CW fiber optic position sensors for aerospace applications

Leon A. Newman

Proceedings Volume 1799, Specialty Fiber Optic Systems for Mobile Platforms and Plastic Optical Fibers; (1993) https://doi.org/10.1117/12.141342
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

During the past five years, fiber optic position sensing for aerospace applications based on high bandwidth chirped modulation of laser diode sources has been explored by a number of organizations. These investigations can be classified into two primary approaches: chirped Frequency Modulated/Carrier Wave (FM/CW) and chirped Amplitude Modulated/Carrier Wave (AM/CW). In this paper, the results of a system level analysis, which compares these two approaches in light of aerospace position sensing requirements, is presented. Key strengths and weaknesses of each approach are reviewed and conclusions are drawn concerning the applicability of each approach to aerospace position sensing. The primary conclusion is that the Doppler frequency shift imposed upon the optical carrier by the dynamic aerospace environment, is a major obstacle to the deployment of sensors based on the chirped FM/CW approach. While, in contrast, the performance of the chirped AM/CW approach is relatively insensitive to Doppler frequency shifts.

Citation Download Citation

Leon A. Newman "Comparison of chirped FM/CW and chirped AM/CW fiber optic position sensors for aerospace applications", Proc. SPIE 1799, Specialty Fiber Optic Systems for Mobile Platforms and Plastic Optical Fibers, (9 February 1993); https://doi.org/10.1117/12.141342

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