Thermal conductivity measuring method and apparatus, and gas component ratio measuring apparatus
US7926323B2 · kind B2 · utility
3Cited by
4References
10Claims
0Family size
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Key dates
| Filing date | Sep 25, 2006 |
| Grant date | Apr 19, 2011 |
| Priority date | — |
| Expiry date | Dec 29, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/225
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A heat radiation coefficient C [=Ph/(Th−To)] from a microheater is calculated in accordance with a power Ph applied to the microheater which is supported in air and provided in an ambient gas, a heater temperature Th, and an ambient temperature To at this moment. Further, a thermal conductivity λ(T) of the ambient gas is obtained from the calculated heat radiation coefficient C based on a proportional relation [C=K·λ(T)] between a thermal conductivity λ(T) of the ambient gas and the heat radiation coefficient C at a measurement temperature T [=(Th−To)/2].
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.