Methods and apparatus for measuring sidestream smoke
US4980571A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1989 |
| Grant date | Dec 25, 1990 |
| Priority date | — |
| Expiry date | Sep 22, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/534
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods and apparatus for continuously and instantaneously measuring sidestream smoke are provided. A hood assembly is provided to fit over the ports of a conventional smoking machine. Sidestream smoke produced by test cigarettes is continuously drawn through the hood by an exhaust system. A laser beam is passed through the smoke one or more times before the beam is sensed by a photodiode detector. An electrical signal from the detector, representing the light transmission, is received by a strip recorder or computer system. The transmission measurements are used to calculate the extinction coefficient of the smoke for comparison purposes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.