| 摘要 |
PURPOSE:To obtain a favorable combustion state by finding out a power spectrum from a light power signal wherein a component exceeding a specific frequency of a light power signal of a flame has been cut OFF, and by determining a frequency band with the aid of a preset reference frequency to find out a power spectrum integral ratio. CONSTITUTION:A light power signal (a) of a flame 3 is detected by a light sensor 4 and inputted into an amplifier 6 to be amplified, and a component exceeding a specific frequency is cut OFF by an analog filter 21. This data is converted into a digital signal and, thereupon, a component exceeding the specific frequency is again cut OFF by a digital filter 23 to obtain a low frequency light power signal (b). This low frequency light power signal (b) is inputted into a frequency analyzer 7 to obtain a power spectrum (d) which is sent to a light power oscillation adjustor 24. Thereupon, the light power oscillation adjustor 24 finds out a power spectrum integral ratio having a large rate of change with respect to an air ratio and outputs an air flow rate compensation factor F into a compensator 9. Thus, a favorable combustion state can be obtained. |
