Online measuring device and method for hearth flame spectral attenuation coefficient distribution

The invention relates to an online measuring device and method for hearth flame spectral attenuation coefficient distribution. The device comprises a synchronous controller, a pulse laser, 56 photoelectric couplers, a data acquisition card, 9 beam splitters, 8 positioners, 8 cooling protection devices and an industrial personal computer. Light emitted by a pulse laser is split into 56 beams twiceby a beam splitter, the 56 beams penetrate through flame and then are collected by a photoelectric coupler, the 56 beams are transmitted to an industrial personal computer through a collection card, and spectral attenuation coefficient distribution of the hearth flame is obtained through a lower computer inversion program. The invention has the following advantages that spectral attenuation coefficient distribution of the hearth flame at multiple positions can be obtained online, the measured spectral attenuation coefficients are transient and are not influenced by dynamic changes of the combustion state, and meanwhil