A New Fluorescence Sensor for Quantification of Atmospheric Humidity

Abstract

A new fiber optic sensor (optrode) for humidity has been developed. The sensor utilizes a fluorescent dye entrapped within a perfluorinated ionomer matrix. The fluorescence intensity increases strongly and linearly with increasing water-vapor partial pressure even though the lifetime of the optrode is approximately 1 second and the presence of CO2 has no detectable effect on the determination of humidity. Apparently, the immobilized fluorescent dye, rhodamine 6G, associates with water to form a complex with a higher absorptivity. The dependence of fluorescence lifetime on emission wavelength revealed the co-existence of multiple excited states for the water-dye system. Keywords: Sensor, Humidity, Fiber optics, Remote analysis.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jul 11, 1988
Accession Number
ADA197497

Entities

People

  • Chu Zhu
  • Frank V. Bright
  • Gary M. Hieftje
  • Wayde A. Wyatt

Organizations

  • Indiana University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Absorption Spectra
  • Chemical Properties
  • Chemistry
  • Dyes
  • Electro-Optics
  • Emission Spectra
  • Environment
  • Fluorescence
  • Lasers
  • Measurement
  • Military Research
  • Optical Fibers
  • Optical Properties
  • Optics
  • Partial Pressure
  • United States
  • Water Vapor

Readers

  • Analytical Chemistry
  • Chemistry (specifically Chemical Fluorescence)
  • Spectroscopy.