| 摘要 |
PROBLEM TO BE SOLVED: To provide a measuring instrument for flame, which is increased in the change of flame signals as well as an S/N ratio and capable of measuring a flame with a high accuracy. SOLUTION: An ionization electrode 15 is arranged in the flame area 14 of a burner and an AC voltage is applied on the ionization electrode whereby the component of a DC voltage is superposed in accordance with the ionization current. A flame resistor 1b affects differently on the AC voltage and the DC voltage, which are conducted through a stopping condenser 3. The AC voltage can be separated from the DC voltage component through first means 5, 6 while the separated AC voltage is compared with the components of the AC voltage separated through second means 9, 10 whereby a signal, modulated in the pulse width of the same, is formed.
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