U.S. Philips Corporation

Maarten J Verkerk

Hendrik Veenvliet

Antonius H Raaymakers

Arnold H Witjes

Anthonie J Burggraaf

Diffuse reflectors are manufactured by depositing a reflecting material (5) on a roughened surface of a synthetic resin layer (1), roughened by treatment in a polyhalogenated hydrocarbon plasma containing fluorine and carbon, such as FREON, containing plasma or by means of UV radiation. The layer (5) of reflecting material may also be deposited on the resin layer (11) at an elevated temperature.

Method of manufacturing a diffuse reflector

A sensor is described for determining the oxygen content of a gas with the sensor consisting of a tablet of stabilized bismuth trioxide having electrode coatings on opposite major surfaces. The resistance between the electrode coatings is a measure of an oxygen partial pressure-dependent quantity. The tablet is immersed entirely in the gas to be analyzed so that the nesessity of a reference gas is eliminated.

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Eindhoven, Netherlands

Maarten J Verkerk