FLAME DETECTION DEVICE

To eliminate a low field area of S/N by making a range in which only a single light-receptive unit show in a flame detection device which adds a light-receptive signal from a plurality of light-receptive units that receive the energy of radiation from a flame and raises detection sensitivity to be made substantial out of the visual field range.SOLUTION: A plurality of light-receptive units 12a and 12b are provided, and light-receptive signals E1 and E2 which observed the same wavelength band of the energy of radiation are outputted. A judgment unit 38 judges an existence of a flame based on addition light-receptive signal E3 which added light-receptive signals E1 and E2 outputted from the light-receptive units 12a and 12b by the adding machine 32. The judgment control unit 36 permits the judgment of existence of a flame by the judgment unit 38, or the adoption of a decision result when the difference of the light-receptible signals E1 and E2 are below a predetermined value, and when the difference exceeds a predetermined value, the judgment of existence of a flame by the judgment unit 38 or the adoption of the decision result is forbidden, and it is made not to judge the existence of a flame with a light-receptible signal with which the S/N got worse.SELECTED DRAWING: Figure 1 【課題】炎からの放射線エネルギーを受光する複数の受光ユニットからの受光信号を加算して検出感度を高める炎検出装置について、単一の受光ユニットのみが見えている範囲を実質的に視野範囲外とするようにしてS/Nの低い視野領域を排除する。【解決手段】複数の受光ユニット12a,12bを設け、放射線エネルギーのうち、同一の波長帯を観測した受光信号E1,E2を出力する。判断部38は受光ユニット12a,12bから出力された受光信号E1,E2を加算器32で加算した加算受光信号E3に基づいて炎の有無を判断する。判断制御部36は受光信号E1,E2の差分が所定値以下の場合、判断部38による炎の有無の判断又は判断結果の採用を許容し、差分が所定値を上回った場合は判断部38による炎の有無の判断又は判断結果の採用を禁止し、S/Nが悪化した受光信号により炎の有無を判断しないようにする。【選択図】図１