温度和压力对Au反射特性影响及动高压下的测温应用分析

摘要

Based on metal electron gas model, the studies and analysis on the effect of temperature and pressure on gold reflectance characteristics changes were done.The experiments of pressure effect on gold reflectivity characteristics under 488 nm wavelength laser by DAC setup and those of temperature effect under high energy laser which supplies dynamic temperature rise were also done, the reflectance characteristics changes were obtained in 11 GPa pressure range and room temperature to 350 ℃ temperature range.The results show that the pressure effect comparing with temperature effect on reflectivity is negligible, the reflectivity is monotonely increasing and up to 10% increase, there is a one-to-one correspondence between reflectivity and temperature.Through the requirement analysis of temperature measurement in dynamic high pressure condition, the measurement method of material transient temperature can be established by gold reflectivity change under 488 nm wavelength laser in lower temperature (<1000 K) section of dynamic high pressure loading.%基于金属电子气模型,进行了温度、压力对Au反射率变化影响的研究与分析.利用DAC装置开展了压力对Au反射率变化测量实验,以及激光加热的动态温升条件下温度对Au反射率变化测量实验,获得了探测光束波长为488 nm条件下,温度(室温至350 ℃)和压力(11 GPa范围内)对Au反射特性影响的实验结果.结果表明:在11 GPa压力范围内,与温度因素相比,压力对Au的反射率变化影响可忽略;Au对488 nm波长激光的反射率变化趋势为单调递增,变化幅值达约10%,且具有反射率与温度的一一对应特性.通过动高压加载下材料温度瞬态测量要求分析,认为基于Au在488 nm波长下的反射变化特性,可建立一种适用于动高压加载下低温段(低于1000 K)的瞬态测温方法,用于解决材料动高压领域的瞬态测温技术难点.