OPTIMIZING COMPOSITION AND PROPERTIES MONITORING

A new method is given for determining a monitored parameter from a sel ected pair of correlated signals, with reference to distinguishing coa l from rock. Radical improvements can be obtained in accuracy and reli ability if the spread ellipses for the signal pair residues for a cons tant value of the monitored parameter are highly elongated and are inc lined at almost a right angle to the projection of the calibration cur ve on the signal plane. It is shown that in favorable cases one can re duce the error by thousands of orders in distinguishing coal from rock by using a pair of signals.