Reduction of directivity of the fiber-optic water flow sensor based on laser-heated silicon Fabry-Perot cavity by using a spherical Tin shell

Nezam Uddin, Guigen Liu, Qiwen Sheng, Weilin Hou, Ming Han

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Fiber-optic flow sensor based on a laser-heated silicon Fabry-Pérot interferometer (FPI) exhibits a strong directivity owing to the cylindrical shape of the sensor head. In this work, a new sensor structure has been designed to effectively reduce the directivity. The proposed sensor embeds the laser-heated silicon FPI in a Tin microsphere (diameter ∼1mm). Due to the circular shape of the outer metal layer, a more symmetric response to flow from different directions is achieved. In the meantime, the high thermal conductivity and small footprint of the metal sphere helps maintain the good responsivity of the silicon FPI to the flow. Directivity of the newly designed sensor has been tested in water flow. Experimental results suggest that deviation in the directional response is reduced to 4% at a speed of ∼1.4 ms-1, in comparison to the 44% for the original sensor without the metal shell. The directivity can be reduced further by improving the fabrication techniques for the metal sphere.

Original languageEnglish (US)
Title of host publicationFiber Optic Sensors and Applications XVI
EditorsRobert A. Lieberman, Glen A. Sanders, Ingrid U. Scheel
PublisherSPIE
ISBN (Electronic)9781510626652
DOIs
Publication statusPublished - Jan 1 2019
EventFiber Optic Sensors and Applications XVI 2019 - Baltimore, United States
Duration: Apr 16 2019Apr 17 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11000
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceFiber Optic Sensors and Applications XVI 2019
CountryUnited States
CityBaltimore
Period4/16/194/17/19

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Keywords

  • Flow measurement
  • directivity
  • fiber-optic sensor
  • metal microsphere
  • silicon Fabry-Perot interferometer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Uddin, N., Liu, G., Sheng, Q., Hou, W., & Han, M. (2019). Reduction of directivity of the fiber-optic water flow sensor based on laser-heated silicon Fabry-Perot cavity by using a spherical Tin shell. In R. A. Lieberman, G. A. Sanders, & I. U. Scheel (Eds.), Fiber Optic Sensors and Applications XVI [110000P] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11000). SPIE. https://doi.org/10.1117/12.2519070