| 摘要 |
In order to be able to distinguish flames produced on burning different fuels from one another, in particular when monitoring high-output boilers having oil burners and coal-dust burners to be ignited by the latter, the procedure is to sense the light intensity emitted by a flame using a sensor which delivers an output signal determined by the light intensity. The variation in the light intensity is examined, the amplitudes of this variation are determined at a relatively high and a relatively low frequency and the ratio of the two amplitudes is taken. As a result of this, a signal output can be obtained which indicates, on the basis of the numerical value of this ratio, that the flame examined belongs to a specific fuel. <IMAGE>
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