Hydrogen probe with limited active area

摘要

An insertion-type hydrogen probe with a defined active length is described. The probe is formed of a thin-walled, hydrogen-permeable material, and a hydrogen-impermeable liner inside the probe blocks out all but the defined active section of the probe. The interior of the probe is subjected to high vacuum, and the hydrogen permeation through the active portion of the probe is determined, for example, by the current output of an ion pump used with the probe. To prevent bimetallic cell interface effects, the probe is constructed so that only a single metal is exposed to the primary environment being studied.