Fibre optic sensors for traffic monitoring applications

Pekka Suopajärvi, Riku Pennala, Mikko Heikkinen, Pentti Karioja, Veijo Lyöri, Risto Myllylä, Seppo Nissilä, Harri Kopola, Heikki Suni

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

13 Citations (Scopus)

Abstract

A novel fibre optic sensors for traffic monitoring applications are presented. They are useful for monitoring the traffic entering and leaving guarded areas, counting traffic on public roads as well as in determining lane occupancy at traffic lights. When installing sensor arrays, the sensors may also be used to provide additional information: measure the speed, wheel base of a vehicle and also to determine the number of axles and vehicle type. The sensors are based on optical fibre or cable, installed inside the asphalt layer of the road, to measure compression or vibrations near the road surface. Two sensor principles were used. One based on the microbending effect and another that utilises the speckle phenomenon. In both cases the whole length of the fibre acts as a sensor. The microbending sensor requires a special fibre and special set-up, whereas in the speckle sensor a standard cable may be used. Both sensor types were tested in field applications where the harsh environment, especially the heat, sets great demands on installation. In these experiments, speed and vehicle type measurements were carried out with good results. In the paper, we will discuss the advantages and disadvantages of both sensor types and present some field test results. We will also show the benefits of these particular fibre optic sensors over traditional sensors.

Original languageEnglish
Title of host publicationProceedings of SPIE
Subtitle of host publicationSmart Structures and Materials 1998 Smart Systems for Bridges, Structures, and Highways
PublisherInternational Society for Optics and Photonics SPIE
Pages222-229
Number of pages8
DOIs
Publication statusPublished - 1998
MoE publication typeNot Eligible
Event5th Annual International Symposium on Smart Structures and Materials : Smart Systems for Bridges, Structures, and Highways - San Diego, United States
Duration: 4 Mar 19985 Mar 1998

Publication series

SeriesProceedings of SPIE
Volume3325
ISSN0277-786X

Conference

Conference5th Annual International Symposium on Smart Structures and Materials
CountryUnited States
CitySan Diego
Period4/03/985/03/98

Keywords

  • Microbending
  • Speckle
  • Vehicle detection
  • Vibration

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  • Cite this

    Suopajärvi, P., Pennala, R., Heikkinen, M., Karioja, P., Lyöri, V., Myllylä, R., Nissilä, S., Kopola, H., & Suni, H. (1998). Fibre optic sensors for traffic monitoring applications. In Proceedings of SPIE: Smart Structures and Materials 1998 Smart Systems for Bridges, Structures, and Highways (pp. 222-229). International Society for Optics and Photonics SPIE. Proceedings of SPIE, Vol.. 3325 https://doi.org/10.1117/12.310611