Cable having a substantially gastight metal tube receiving at least one optical conductor and a hydrogen-absorbent substance
The invention relates to a cable having a substantially gastight metal tube receiving at least one optical conductor and a hydrogen-absorbent substance. The inside face of the tube is covered with a layer of a catalyst substance such as nickel or chromium for catalyzing the reaction whereby the hydrogen-absorbent substance absorbs hydrogen. Said layer is itself covered with at least one layer of hydrogen-absorbent substance which constitutes a filler material for filling the tube, or which merely forms a layer deposited on the layer of catalyst substance.
1. A method of manufacturing a cable comprising:
covering an inside surface of a strip of metal with a catalyst substance;
forming the strip of metal in a shape of a tube;
inserting optical conductor(s) and a filler material into the tube, the filler material constituting a hydrogen absorbent substance; and
swaging the formed tube after it has been welded.
2. A method of manufacturing a cable comprising:
covering an inside surface of a strip of metal with a catalyst substance;
covering the catalyst substance with a hydrogen-absorbent substance;
forming the strip of metal in a shape of a tube, by mutually overlapping longitudinal margins of the strip of metal; and
gluing the overlapping margins.
3. The method according to claim 2 , in which the layer of hydrogen-absorbent substance is used for the gluing.
4. The method of manufacturing a cable according to claim 1 , wherein the tube is a substantially gastight metal tube and the catalyst substance is for catalyzing a reaction whereby the filler material is a hydrogen-absorbent substance which absorbs hydrogen, said catalyst substance itself being covered, at least in part, with at least one layer of the hydrogen-absorbent substance.
5. The method of manufacturing a cable according to claim 2 , wherein the hydrogen-absorbent substance forms merely a layer deposited on the layer of catalyst substance.
6. The method of manufacturing a cable according to claim 2 , wherein the tube is a substantially gastight metal tube and the catalyst substance is for catalyzing a reaction whereby the filler material is a hydrogen-absorbent substance which absorbs hydrogen, said catalyst substance itself being covered, at least in part, with at least one layer of the hydrogen-absorbent substance.