Determination of carbon in fly ash from microwave attenuation and phase shift
AssigneeCommonwealth Scientific and Industrial Research Organisation
InventorNicholas G. Cutmore
Life of this patent
Estimating the term…
Abstract
In the determination of the unburnt carbon content of fly ash, a microwave signal is transmitted through or reflected from a fly ash sample and the attenuation and phase shift of the transmitted or reflected signal from receiver antenna or circulator respectively, is determined with respect to the incident signal and used to provide a measure of unburnt carbon content. The invention is applicable to measurement of fly ash samples taken from a boiler outlet duct or for direct measurement of the unburnt carbon content of fly ash entrained in flue gas.
Claims19
An apparatus to measure the unburnt carbon content of fly ash comprising means to generate a microwave signal, transmitter means to launch said microwave signal for transmission through a fly ash sample, receiver means to receive a signal passed through the sample and processing means to determine the attenuation and phase shift of the signal passed through the sample with respect to the launched signal and to produce a measure of unburnt carbon content.
An apparatus to measure the unburnt carbon content of fly ash comprising means to generate a microwave signal, antennae means to launch a microwave signal into a fly ash sample and to receive a reflected signal and processing means to determine the attenuation and phase shift of the reflected signal with respect to the launched signal and to produce from said attenuation and phase shift a measure of unburnt carbon content.
A method of measuring the unburnt carbon content of fly ash comprising the steps of launching a microwave signal into a fly ash sample, receiving a transmitted signal, determining the attenuation and phase shift of the received signal with respect to the launched signal and producing a measure of unburnt carbon content from said attenuation and phase shift.
A method of measuring the unburnt carbon content of fly ash comprising the steps of launching a microwave signal into a fly ash sample, receiving a reflected microwave signal, determining the attenuation and phase shift of the reflected signal with respect to the launched signal and producing a measure of unburnt carbon content from said attenuation and phase shift.
Dependencies are inferred from the claim text.