A hand-held optical sensor for dissolved oxygen measurement

Dan Xiao*, Yuanyao Mo, Martin M F CHOI

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

25 Citations (Scopus)


A hand-held dissolved oxygen optical sensor based on solid-state electronics and highly oxygen-sensitive luminescence material has been developed. Oxygen-sensitive dye absorbed on silica gel particles was dispersed in a 0.2 mm homogenous silicone rubber film (optode membrane) and coated on a 580 nm long-pass filter. The O2-sensitive dye was excited by an ultra-bright blue light-emitting diode and the emission intensity was captured by a silicon photodiode. The long-pass filter efficiently reduced the scattered light from the light source. The emission signal of the optode membrane was converted to the voltage signal which was processed by a single-chip Micyoco controller, and the dissolved oxygen concentration was automatically displayed on a liquid crystal display unit. The developed hand-held optical sensor is a single-piece device which can provide instant and reliable dissolved oxygen measurement. The sensor showed good repeatability, photostability and long-term stability. Satisfactory results were obtained when its analytical performance was compared with that of a typical Clark-type amperometric oxygen electrode. The developed oxygen optical sensor possesses the advantages of portability, low cost and long lifetime.

Original languageEnglish
Pages (from-to)862-867
Number of pages6
JournalMeasurement Science and Technology
Issue number6
Publication statusPublished - Jun 2003

Scopus Subject Areas

  • Instrumentation
  • Engineering (miscellaneous)
  • Applied Mathematics

User-Defined Keywords

  • All solid-state device
  • Dissolved oxygen sensor


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