一种新型有机非线性光学材料的Z扫描研究

Combustion measurement by Using Optic Fiber Combustion Sensors

ＰＤＡＢＳ－１［５－（２－硫甲基－４－甲基）－嘧啶基－戊二炔－１－醇－４－Ｎ，Ｎ二甲氨基偶氮苯－４－磺酸酯］ＴＨＦ溶液的三阶光学非线性极化率χ（３）的Ｚ－扫描测试显示在单光子吸收区附近该材料的非线性由饱和吸收所支配。在波长为５３２ｎｍ，脉宽为１００ｐｓ的激光作用下，其非线性极化率实部Ｒｅχ（３）为－４．２００×１０－９ｅｓｕ，对应的非线性折射率值ｎ２为－１．２９９×１０－１１ｅｓｕ＜０，属自散焦材料。

A fiberoptical combustion sensing system is introduced here.It can be applied to measure the curves of spectra luminous intensities variations of combustion flame in internal combustion engines.In this experiment,the curves of luminous intensity variations of three characteristic spectra CH(431nm)、C2(516nm)and H2O(588nm)under different operational conditions are measured.The results show that the obtained curves reveal trhe actual goodness of combustion process,and the time characteristics of combustion can be displayed on these curves.So the curves can be used to make combustion diagnosis and analysis.The opticalfiber combustion sensor developed can be used as feedback control sensor in modern engine management system.