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Proceedings Paper

Optical fiber magnetic field sensors and signal processing for vehicle detection and classification
Author(s): Igor A. Kostic; Carvel E. Holton; Richard O. Claus
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Paper Abstract

A miniaturized optical fiber magnetometer has been designed, assembled and evaluated for the detection and classification of vehicles. The sensor element consists of a Fabry-Perot cavity formed between the parallel ends of a high quantity cylindrical metallic glass ribbon and a single mode optical fiber, both held int a hollow tube with an inner diameter several microns larger than the ribbon and the fiber. This sensor head is then potted in a small-diameter, rugged, nonmagnetic housing to allow handling and installation into a protected section of parking lot or other environment to enable vehicle signature detection and analysis. The minimum detectable magnetic field is on the order of 100 nT at dc. The sensor has been used to evaluate the potential detection and analysis of vehicle signatures. When material in a vehicle passes nearby the sensor element, it perturbs the magnetic field and produces a complex output signal dependent upon the shape of the ferrous material in the vehicle, its distance and orientation with respect to the sensor element, and the sped of the vehicle. We have also considered the use of wavelet methods to allow the processing of such data, because it allows variations in differential phasing corresponding to varying vehicles speeds.

Paper Details

Date Published: 8 January 1999
PDF: 12 pages
Proc. SPIE 3525, Mobile Robots XIII and Intelligent Transportation Systems, (8 January 1999); doi: 10.1117/12.335718
Show Author Affiliations
Igor A. Kostic, Virginia Polytechnic Institute and State Univ. (United States)
Carvel E. Holton, Virginia Polytechnic Institute and State Univ. (United States)
Richard O. Claus, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 3525:
Mobile Robots XIII and Intelligent Transportation Systems
Howie M. Choset; Pushkin Kachroo; Mikhail A. Kourjanski; Douglas W. Gage; Pushkin Kachroo; Marten J. de Vries; Mikhail A. Kourjanski; Marten J. de Vries, Editor(s)

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