Detection of water entrapped in electronic components
US4711118A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1981 |
| Grant date | Dec 8, 1987 |
| Priority date | — |
| Expiry date | Nov 5, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/39
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The accuracy of measurements made to determine the extent of water vapor trapped upon encapsulation of an electronic device is significantly enhanced by carefully controlling the measurement technique employed. In particular, the encapsulant is generally punctured and the water vapor thus released is monitored. It has been found that to obtain an accurate measurement of the magnitude of the water vapor released, this measurement must be made within 0.1 second of the time of encapsulant punctured and released into a glass system. By using an absorption technique with suitable electronics, this time requirement is fulfilled and significantly more accurate quantitative measurements of entrapped water vapor are obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.