Heptafluoropropane （HFP）, as the best altemative to halon fire-suppression agents, is now a widely used fire extin- guishing agent. The current studies of HFP, concentrating on the extinguishing mechanisms of flames...Heptafluoropropane （HFP）, as the best altemative to halon fire-suppression agents, is now a widely used fire extin- guishing agent. The current studies of HFP, concentrating on the extinguishing mechanisms of flames and decomposition products, in general deal with the destructive and high temperature cases. In this paper, terahertz time-domain spectra are used to characterize HFP at different pressures. Optical parameters of HFP, such as absorption coefficient, refractive index, and relative permittivity, and their relationship with concentration of samples, are discussed. The absorption peak of HFP at 0.3 THz depends strongly on the applied pressure, and the corresponding parameters increase almost linearly with increasing HFP concentration. The present study lays a foundation for future extensive applications.展开更多
基金Project supported by the National Key Basic Research Program of China(Grant No.2014CB744300)the Specially Funded Program on National Key Scientific Instruments and Equipment Development,China(Grant No.2012YQ140005)the Beijing Natural Science Foundation(Grant No.4122064)
文摘Heptafluoropropane （HFP）, as the best altemative to halon fire-suppression agents, is now a widely used fire extin- guishing agent. The current studies of HFP, concentrating on the extinguishing mechanisms of flames and decomposition products, in general deal with the destructive and high temperature cases. In this paper, terahertz time-domain spectra are used to characterize HFP at different pressures. Optical parameters of HFP, such as absorption coefficient, refractive index, and relative permittivity, and their relationship with concentration of samples, are discussed. The absorption peak of HFP at 0.3 THz depends strongly on the applied pressure, and the corresponding parameters increase almost linearly with increasing HFP concentration. The present study lays a foundation for future extensive applications.
