Aperture module for use in particle testing apparatus
US4014611A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1975 |
| Grant date | Mar 29, 1977 |
| Priority date | — |
| Expiry date | Apr 30, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2015/1019
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An aperture module for obtaining signals from microscopic particles suspended in a fluid which passes through a scanning aperture. A module housing including an aperture holder is mounted on a vessel or bath containing a body of the particulate liquid suspension to be tested. The aperture holder with aperture formed therein extends into the vessel to permit passage of the suspension through the aperture to an outlet chamber or passageway immediately behind the aperture. An inlet chamber or passageway in the module is connected to a source of clean electrolyte and in fluid communication with the outlet passageway. The outlet passageway is connected to a waste collecting container. A vacuum is applied to the collecting container to cause the clean electrolyte to be drawn through the inlet passageway and wash behind the aperture simultaneously with passage of the suspension through the aperture. A restriction in the path of flow of the clean electrolyte immediately behind the aperture causes the flow velocity thereof to increase behind the aperture and ensure that the zone behind the aperture continuously is washed or swept and that particles which have been tested or sensed are carri…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.