Method for synchronizing particle counters to external events
US5235625A · kind A · utility
11Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1992 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Jan 27, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/94
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and an apparatus for synchronizing particle counts to process events provide a trigger signal related to the process events in lieu of a time-based trigger signal. In one embodiment, the controller to a particle counter further subdivides a process event into sub-intervals to allow profiling of particle counts during the process event. In one embodiment, the controller of the particle counter receives multiple trigger signals corresponding to multiple trigger signal sources, each trigger signal source being identified by a source tag. Particle counts and time-stamps are maintained for each source of the trigger signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.