The Analysis, Based On The Optical Wave Method And The Principle Of Particle Sizing And Multi-wavelength Flame Temperature

In section 1 of this paper, a multi-wavelength analysis method is introduced to measure temperature of carbon hydrogen flame. In the study, SD2000 spectrometer is applied to obtain radiation spectrum of flame within wavelength 480-llOOnm, from which flame temperature and monochromatic emissivity are derived by Newton Raphson non-linear method and Levenberg-Marquart modeling method. The flame monochromatic emissivity is translated in form of F(/l)and a(A) respectively.Experimental results on butane and butane-plant oil flames indicated that, measurement precision by the multi-wavelength method is strengthened by taking radiation information on multiple wavelength units into consideration, and moreover, the radiation calibration procedure is simplified, in that a halogen light source is used instead of in situ flame radiation.In section 2, fluctuation and averaging analyses are carried out on optical transmission signals by particles passed through laser beams to derive particle size and concentration in measuring area, furthermore, correlation calculations are conducted on two adjacent laser beam signals to obtain flowing velocity of particle. In the study, FFT and digital filtering calculations are employed to assure measurement precision.Experimental studies from industrial systems demonstrated that, fluctuation and correlation methods can be applied on non-spherical opaque particles, the precision are are within 10% and 8% respectively.