| 摘要 |
The aim of the invention is to create a test method and a device which allow electric charge flowing between two electrodes to be measured as accurately as possible in order to verify the tightness of moisture barriers. Said aim is achieved by a method and a device for measuring small electric charges by means of a test electrode and a measuring electrode which are both in contact with one respective electrolyte liquid and are interconnected via an electric voltage source. The test electrode is surrounded by a moisture barrier whose tightness is to be verified while the measuring electrode encompasses a metal strip that is in contact with the electrolyte liquid and detaches from the measuring electrode or is dissolved in the electrolyte liquid according to the number of electrical charge carriers exchanged between the electrodes. The tightness of the moisture barrier can be measured by measuring the change in length of the metal strip. The invention is based on a galvanic process taking place in the inventive measuring device, an electrochemical, integrated test method being carried out which allows the electric charge flowing between two electrodes to be determined in an extremely accurate fashion. The inventive method makes it possible to verify the integrity or tightness of insulation layers or moisture barriers for implants with more accuracy than in previous art while reducing the influence of electromagnetic interferences on the test result. |
