Hartmann & Braun

Gunther Bernhardt

Walter Fabinski

A method for making a gas chamber for photometric measuring equipment comprises providing a metal frame with recesses on opposite sides establishing a web and at least one opening in the web and having solder surface areas; providing at least two calcium fluoide panes, said panes each having a rim portion; is improved by providing rim surface portions of the panes about to face the recess-web portion of said metal frame with a plurality of layers, by (i) physical vapor depositing a thin chromium nickel layer, (ii) physical vapor depositing thereon a nickel layer, and (iii) by physical vapor depositing thereon a gold layer; vapor depositing on the web portion around the opening of said recesses a gold layer; providing at least two solder elements of basically ring-shaped configuration respectively to be interposed between the web and the panes, the soldering elements being configured so that between their respective outer contour and walls of the recesses a solder flow space obtains when the solder elements are placed into the recesses; and soldering the element on one side for solder-connecting the respective pane to the web at a temperature of about 213.degree. C. in an inert gas and the other element on the other side of and to the web and the respective other pane at a soldering temperature at about 170.degree. C. in an inert gas.

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Frankfurt-am-Main, Germany

Gunther Bernhardt