Microprobe - Microwave Measurement of Furnace Wall Thickness

Abstract

Glass furnaces such as the one shown schematically in Fig. 1 are built with blockwork made of a dense fusion cast refractory such as AZS or Sillimanite. After commissioning they are run continuously for typically 3 years to 6 years before wall and floor erosion causes them to become dangerous at which point they rnust be demolished and rebuilt. The cost is typically £2m so it is important to be able to measure wall thickness in order to obtain maximum working life consistent with safety.