Journal of Microwave Power and Electromagnetic Energy (JMPEE)
TITLE	A Microwave Instrument for Measurement of Small Inhomogeneities in Supercalendar Rolls and Other Dielectric Cylinders [PDF]
AUTHORS	M. Tiuri, P. Liimatainen and S. Reinamo 1974 9 2 117-122
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Abstract A microwave instrument for non-destructive testing of the homogeneity of supercalendar rollers used in paper mills is described. The senor consists of a flat coaxial transmission line a half wavelength long. A sensitivity of more than 0.1% is achieved in measuring small changes in the dielectric constant. Measurement of absolute values of the dielectric constant is also possible.