Instrument for polarographic potentiometric, thermal and like measurements and a method of making the same
US4217194A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1976 |
| Grant date | Aug 12, 1980 |
| Priority date | — |
| Expiry date | Dec 1, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A probe having a measuring device for polarographic, potentiometric, ther and like measurements has a high-resistance transducer which is provided with leads. A body of insulating material is arranged about the transducer and a metal-containing body is arranged about the insulating material. The metal-containing body includes a metal layer which is essentially free of pores and essentially impervious to the diffusion of liquid therethrough and which thus seals the insulating material against contamination by foreign matter. A metal layer which is essentially free of pores and essentially impervious to the diffusion of liquid therethrough may be formed by sputtering the metal onto a substrate using a high-frequency field at an output of 10 to 40 watts per square centimeter of target surface, the sputtering operation being carried out for a period of 5 to 10 minutes in an Ar atmosphere having a pressure of 8 .times.10.sup.-4 torr. An insulating layer may be formed by sputtering an insulating material onto a substrate using a high-frequency field and an atmosphere made up of a protective gas and a reactive gas having partial pressures such that the total pressure of the atmosphere is …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.