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 对丁烷气体火焰及丁烷-植物油混合燃料火焰的测量结果表明，多波长分析方法优于传统的双色法，表现在两个方面：一、由于综合考虑多个波长单元上的火焰辐射信息，多波长方法的测量精度比双色法有较大的提高；二、在多波长分析方法中，采用标准卤素灯进行相对辐射强度标定，简化了双色法中的火焰绝对辐射强度的标定。
