The study of fabrication of the liquid core waveguide nutrient sensor

Chih Wei Wu, Yung Kang Shen, Yi Lung Lee, Chung Sheng Wei, Chun Ching Hsiao

Research output: Contribution to journalArticle

Abstract

A novel nutrient sensor using liquid core waveguide technique is reported, implementing Teflon AF 1601S coated microchannels. Straight PDMS microchannels replicated from a master were coated with Teflon AF 1601S and sealed with a Teflon AF 1601S coated Pyrex 7740 wafer. It formed a liquid core waveguide with a low index of refraction channel in which a high index aqueous solution was flowed. Light generated by a fiber-coupled tungsten halogen lamp propagated by total internal reflection to the end of the channel where the light was detected using a CCD array spectrometer. There is a dramatic difference between channels with and without a Teflon coating. The absorbance response of this sensor varies linearly with concentration. This innovative technique provides a potentially low-cost and high efficient approach to fill the inspection technology gap between in-situ and laboratory analyses. It is believed that the novel process is expected to give an impact to the aqueous inspection and to create a highly value-added technology in optical test, measurement industry.

Original languageEnglish
Pages (from-to)425-430
Number of pages6
JournalKey Engineering Materials
Volume364-366 I
Publication statusPublished - 2008
Externally publishedYes

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Keywords

  • Liquid core waveguide
  • Nutrient sensor
  • Teflon AF 1601S

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemical Engineering (miscellaneous)

Cite this

Wu, C. W., Shen, Y. K., Lee, Y. L., Wei, C. S., & Hsiao, C. C. (2008). The study of fabrication of the liquid core waveguide nutrient sensor. Key Engineering Materials, 364-366 I, 425-430.