Abb Schweiz Ag

Stichting Energieonderzoek Centrum Nederland

Bernard Dam

Ruud Johannes Westerwaal

Jacobus Lodevicus Martinus Van Mechelen

Barbara Panella

Robin Gremaud

Marinus Johannes Slaman

Jacobus Ludevicus Martinus Van Mechelen

Mathieu Raymond Henri Pasturel

Herman Schreuders

Mercedes Victoria Garcia

An optical sensing system for sensing hydrogen in a fluid comprising a first optical sensor comprising a first optical fiber, wherein an end portion of the first optical fiber is coated with a first hydrogen-sensitive multilayer on an end surface perpendicular to a longitudinal axis of the first optical fiber, the first multilayer being adapted to change its optical properties dependent on a hydrogen partial pressure in the fluid and dependent on a temperature of the fluid, with a known first characteristic; a second optical sensor comprising a second optical fiber, wherein an end portion of the second optical fiber is coated with a second hydrogen-sensitive multilayer on an end surface perpendicular to the longitudinal axis of the second optical fiber, the second multilayer being adapted to change its optical properties dependent on the hydrogen partial pressure in the fluid and dependent on a temperature of the fluid, with a known second characteristic which is different from the first characteristic; at least one light source adapted for coupling light into the first optical fiber and the second optical fiber, at least one light detector adapted for detecting light reflected by the first and second multilayer, a control unit adapted for calculating the hydrogen partial pressure in the fluid by using the first characteristic and the second characteristic and an output signal of the at least one light detector.

Optical sensing system for determining hydrogen partial pressure

An optical sensor for detecting hydrogen in a fluid in physical contact with the sensor is provided. The sensor includes an optical fiber, wherein an end portion of the optical fiber is coated with a multilayer including: a sensing layer, including a film of an alloy, the alloy including Mg, Ni, and M, wherein M is at least one of Zr, Ta, and Hf, and wherein the alloy has the composition MgNiM, and wherein x is from 40 to 60, y is from 10 to 40, and z is from 10 to 40, and a catalyst layer including Pd. Further, a detection system for hydrogen, including such an optical sensor, and an electrical device having such a detection system are provided.

Hydrogen sensor, hydrogen detection system employing the same, and electrical device with a hydrogen detection system

A thin film device includes an active layer (), wherein the active layer has optical properties that change by adding and removing hydrogen, and includes a Mg-transition metal layer, or rare earth based layer, the active layer being provided on one side with a protective layer () that is hydrogen, oxygen and water vapor permeable and liquid water impermeable, and has hydrophobic surface properties. The thin film can further include a Pd catalyst layer () disposed between the active layer () and the protective layer (). The thin film device can be used in a switchable mirror wherein the optical properties of the mirror can be changed by adding/removing hydrogen to/from the active layer.

Protective coating for metalhydride based devices

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The Hague, Netherlands

Bernard Dam