Istituto di Scienza e Tecnologie dell'Informazione     
Bramanti M., De Michele G. A microwave method to measure unburnt coal content in ashes. In: IEEE Transactions on Instrumentation and Measurement, vol. 39 (5) pp. 804 - 806. IEEE, 1990.
The determination or unburnt coal content in ashes of combustors without detailed chemical analysis remains an important problem. In our previous paper, a method was proposed based on the determination of the complex dielectric permittivity or the ashes by measuring the complex reflection coefficient from a suitably designed microstrip transmission system loaded by the material under test. A modified and greatly simplified procedure is proposed there. The method is based on measurements of the modulus of the reflection coefficient of a sample holder loaded with the test sample.

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