An Optical Waveguide Humidity Detector.
Abstract
An optical waveguide humidity detector is described that is reliable and inexpensive. It utilizes a cobalt chloride/poly(vinyl pyrrolidone) film on the surface of a thin walled glass capillary waveguide, and monitors the absorption change at 660 nm as the waveguide is exposed to H2O(g). The humidity response is an S-shaped curve with the inflection point between 65% and 80% RH; location of inflection point is correlated with CoCl2 and PVP concentration in the film. The effects of reagent concentration and film thickness on detector response are described. Keywords include: Capillary waveguide; Optical waveguide; Chloride/polyvinyl pyrorolidone, and Humidity detector.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 1985
- Accession Number
- ADA160577
Entities
People
- D. S. Ballantine
- H. Wohltjen
Organizations
- United States Naval Research Laboratory