| 摘要 |
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 lambda(T) of the ambient gas is obtained from the calculated heat radiation coefficient C based on a proportional relation [C=K.lambda(T)] between a thermal conductivity lambda(T) of the ambient gas and the heat radiation coefficient C at a measurement temperature T [=(Th-To)/2].
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