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Title: Optical humidity sensor

An optical dielectric humidity sensor which includes a dielectric mirror having multiple alternating layers of two porous water-adsorbent dielectric materials with differing indices of refraction carried by a translucent substrate. A narrow-band polarized light source is positioned to direct light energy onto the mirror, and detectors are positioned to receive light energy transmitted through and reflected by the mirror. A ratiometer indicates humidity in the atmosphere which surrounds the dielectric mirror as a function of a ratio of light energies incident on the detectors.
Authors:
 [1]
  1. (Ann Arbor, MI)
Publication Date:
OSTI Identifier:
866135
Report Number(s):
US 4641524
DOE Contract Number:
AC02-84ER80144
Resource Type:
Patent
Research Org:
KMS Fusion Inc
Country of Publication:
United States
Language:
English
Subject:
optical; humidity; sensor; optical; dielectric; humidity; sensor; dielectric; mirror; multiple; alternating; layers; porous; water-adsorbent; dielectric; materials; differing; indices; refraction; carried; translucent; substrate; narrow-band; polarized; light; source; positioned; direct; light; energy; mirror; detectors; positioned; receive; light; energy; transmitted; reflected; mirror; ratiometer; indicates; humidity; atmosphere; surrounds; dielectric; mirror; function; ratio; light; energies; incident; detectors; light energy; light energy; dielectric materials; polarized light; alternating layers; light source; dielectric material; receive light; energy transmitted; optical dielectric; dielectric mirror; dielectric mirror; humidity sensor; humidity sensor /73/