Abstract
Heat flux sensors are focused related to energy conservation. They are convenient tools which can detect direction and amount of heat flux. It is necessary to determine sensitivity of heat flux sensors before they are used. The sensitivity is a relation coefficient between heat flow density and output voltage of sensor. The steady state method is used to determine it in many cases. National Metrology Institute of Japan (NMIJ) of National Institute of Advanced Industrial Science and Technology (AIST) is supplying calibration service for heat flux sensors using by a Guarded Hot Plate (GHP) apparatus. The measurement with GHP apparatus takes long time more than one week although it gives reliable result with small uncertainty. In order to solve this problem, the small apparatus for practical calibration of heat flux sensors was developed according to the steady state method. The apparatus has beautiful steady temperature gradient in the volume of 30 mm × 30 mm x 30 mm. The cover made by expanded polypropylene is effective to decrease heat loss. It takes about 40 minutes to be steady state. Uncertainty of sensitive coefficient estimation using this apparatus was roughly evaluated less than 10% with the coverage factor k = 2.
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