United Biscuits (uk) Limited

Robert Mitchell Rolston

Simon Henry Shaw

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.

Measurement of heat flux in a heated chamber

Apparatus for and methods of meauring heat flux comprises first and second sensors arranged to pass through an oven in line astern. Each sensor measures the temperature difference across a thermally insulating layer by having one surface of each sensor being exposed to the heat flux, each sensor including thermocouple measuring junctions for measuring the temperature of the exposed surface. The first sensor is radiation-absorbing and the second sensor is reflecting. The apparatus includes additional thermocouple junctions for measuring the gas temperature and a device for recording data from the sensors and from additional thermocouple junctions. The signals from one of the sensors at one instant are correlated with the corresponding signals from the other sensor at a later instant, the time difference being the time taken for one sensor to reach a position formerly occupied by the other sensor.

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High Wycombe, United Kingdom

Robert Mitchell Rolston