Abstract
Selective emitters can be used effectively to obtain spectrally matched flare compositions. This work investigated selective emitters in combusting KClO4/Zr pyrotechnics, which was used as a pyrotechnical pump light source for solid state lasers, and analyzed the spectral matching of selective emissions with Nd-doping laser materials. Emission spectra were obtained with an Ocean Optics HR 4000 UV-NIR fiber spectrometer. Thermodynamical calculation was conducted to aid understanding the combustion process of KClO4/Zr. Major selective emissions observed included spectral lines of atomic K (g), Cl (g), O (g), and molecular ZrO (g). When Zr content in the formula increased from 50% to 60%, the radiation efficiency in the bands of 730–760 nm and 790–820 nm decreased from 13.09% to 10.0% and from 4.70% to 3.66%, respectively. The highest radiation efficiency for KClO4/Zr (50/50) was partly ascribed to the strongest emission of atomic K (g) generated by this formula.
ACKNOWLEDGMENT
The authors would like to acknowledge the support of the National High Technology Development Program of China under Grant No. 2009AA8043022.
Notes
aLinstrom and Mallard, 2009; Pearse and Gaydon, 1976; Richardson, 1931.