Allergen detector system and method
US6008729A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1997 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | Jul 3, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N15/0205
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A light beam is directed from a light source through an air sample so that portions of the beam will be scattered if any particles are present in the path of the beam. A beam blocking device on the opposite side of the air sample is arranged to block all light except light scattered in a predetermined angular range corresponding to a predetermined allergen particle size range. A light focusing lens in front of the light source is arranged to focus the unscattered part of the light beam onto the blocking device. Light transmitted through the blocking device is detected by a light detector and an alarm output signal is produced if the detected amount of light is above a predetermined level. The signal may be used to activate filtering or air conditioning devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.