Method for testing a spherical shell for the manufacture of a piezoceramic hydrophone

摘要

The invention relates to a method for testing a spherical shell for the production of a piezoceramic hydrophone at least comprising: the determination of a threshold value sw.1 from a previously determined maximum number of non-black-colored defects (4b) and / or a threshold value sw.2 of a variable of non-black-colored defects (4b) and / or a threshold value sw.3 of the position of non-black-colored defects (4b); a.) Application of an outer layer (4) comprising silver and optionally silicon compounds on a first spherical half-shell (1a) and a second spherical half-shell (1b); b.) Sintering and / or calcining the outer layer (4) and obtaining a first coated spherical half-shell (1a ') and a second coated spherical half-shell (1b'); c.) Joining the first coated spherical half-shell (1a) with the second cleaned coated spherical half-shell (1b ") to form a hollow sphere (3); d.) plasma treatment of the outer layer (4) and obtained e in a plasma-treated hollow sphere (3 ') with a black-colored outer layer (4a); e.) testing the black-colored outer layer (4a) for: - a number of non-black-colored defects (4b) and obtaining a first value w.1; and / or a size of non-black-colored imperfections (4b) and obtaining a second value w.2; and / or- a position of non-black-colored defects (4b) and receipt of a third value w.3f.) Comparison of the values w.1 with sw.1 and / or w.2 with sw.2 and / or w.3 with sw.3; g.) Remove the plasma-treated hollow sphere (3 ') if w.1 is greater than sw.1 and / or w.2 is greater than sw.2 and / or w.3 is greater than sw.3.