Method of measuring thickness of a tin layer and thickness measuring device therefor

US4401518A · kind A · utility

Inventors

• Helmut Fischer · Calw, DE
• Willi Steegmuller · Nagold, DE

Key dates

• Filing date: Feb 5, 1981
• Grant date: Aug 30, 1983
• Expiry date: Feb 5, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4161
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An electrolyte chamber has an opening on the side facing the foil to be measured for letting the electrolyte through to the foil, a hollow cathode in the chamber, a supply line connected to the chamber through the hollow cathode for supplying the electrolyte to the chamber, and a negative pressure flow-off line connected to the chamber located at a distance from the mouth of the supply line. A negative pressure generator is connected to the flow-off line through a separator vessel which has a level switch which shuts off the generator when the electrolyte reaches a predetermined level. The supply line is connected to a supply vessel containing the electrolyte and runs continuously into the liquid volume in the vessel. The vessel has a connection to the atmosphere.