Importance

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Abstract

A heat flux measuring device for transporting through a heated chamber, the device having an array of sensors, each sensor comprising first and second surfaces bounding a region, a thermally insulating layer substantially occupying said region, and means for providing a signal which is a measure of the temperature difference across the layer. The said first surface of each sensor is in thermal contact with a heat sink and the said second surface of each sensor is exposed. A plurality of the said exposed surfaces of the array are reflective to radiation and a further plurality of the said exposed surfaces of the array are absorbent to radiation, the sensors of the array being so arranged that the area of radiation-absorbing exposed sensor surface and the area of radiation-reflecting exposed sensor surface are each substantially equally distributed about a mid-line of the array extending along the direction in which in use the device will be transported and about a mid-line of the array extending along the direction transverse to the direction in which in use the device will be transported.

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First Claim