Hydrogen sensing with palladium-coated optical fibers

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.341414· OSTI ID:7127308

Butler, M A; Ginley, D S

Palladium-coated, single-mode optical fibers have been used to detect hydrogen in a concentration range 20 parts per billion to 2% in 1 atm of nitrogen. When the coated fibers are exposed to hydrogen, a hydride is formed with an expanded lattice constant, which stretches the optical fiber. This change in optical path length is measured using a Mach--Zehnder interferometer. A simple one-dimensional model is presented and shown to accurately reproduce the fiber response. Using electrodeposited palladium films, a factor of 7 enhancement in the hydrogen solubility is observed, as well as a deeply bound site which is saturated in the parts per million concentration range. The data suggest that this site may be due to hydrogen binding to a free surface of the palladium.

• Research Organization: Sandia National Laboratories, Albuquerque, New Mexico 87185
• OSTI ID: 7127308
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 64:7; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
ADSORPTION
CHALCOGENIDES
COATINGS
CONTAMINATION
DEPOSITION
ELECTRODEPOSITION
ELECTROLYSIS
ELEMENTS
FIBERS
GAS ANALYSIS
HYDROGEN
INTERFEROMETERS
INTERFEROMETRY
LYSIS
MACH-ZEHNDER INTERFEROMETER
MEASURING INSTRUMENTS
METALS
MINERALS
NONMETALS
OPTICAL FIBERS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
SEMIMETALS
SILICA
SILICON
SILICON COMPOUNDS
SILICON OXIDES
SOLUBILITY
SOLVENT PROPERTIES
SORPTION
SORPTIVE PROPERTIES
SURFACE COATING
SURFACE PROPERTIES
SURFACES
TRANSITION ELEMENTS