Non-destructive characterization of refractories by mirage effect and photothermal microscopy G. SAVIGNAT, P. BOCH, L. POTTIER, D. VANDEMBROUCQ and D. FOURNIER J. Phys. IV France, 03 C7 (1993) C7-1267-C7-1272 DOI: 10.1051/jp4:19937195