Leak test method and apparatus
US6182501A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1998 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Oct 15, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/3263
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a leak test method and apparatus which introduces high-pressure gas into a work and a master from a high-pressure gas source through first and second electromagnetic valves, respectively, closes the first and second electromagnetic valves, detects the pressure difference between the work and the master by a differential pressure sensor, and compares the amount of leakage, obtained from the pressure difference, with a leakage reference value to thereby decides the work to be leak-free or leaky, a third electromagnetic valve is provided which permits and inhibits the passage of gas between the work and the master. Prior to measuring pressure difference variations in a measurement period and a stabilization period, the third electromagnetic valve is opened to establish a pressure equilibrium between the work and the master, then the electromagnetic valve is closed, then measures the pressure difference variations, and a last pressure difference variation .delta.p.sub.e is subtracted from an initial pressure difference variation .delta.p.sub.s to obtain the amount of drift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.