Method for measuring the surface area of a solid
US4416154A · kind A · utility
1Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1981 |
| Grant date | Nov 22, 1983 |
| Priority date | — |
| Expiry date | Aug 11, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02408
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for enhancing the intensity of a photoacoustic signal by surrounding a solid with a gas having a normal boiling point at least about 25.degree. C. below the temperature at which the photoacoustic effect is being measured and a critical temperature not less than about 2.degree. C. By utilizing a second gas, selected from the permanent gases having a critical temperature not greater than about -73.degree. C., the surface area of a solid can be measured in accordance with procedures and relationships herein described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.