摘要
利用纳秒激光脉冲所激发的超声纵波,非接触地测量了蓝宝石单晶沿c轴方向的弹性模量C_(33)随温度的变化关系.结果表明,在室温到1000℃的范围内,蓝宝石的弹性模量C_(33)随温度T的升高而减小,两者之间近似呈如下二次关系:C_(33)=-1.541×10^(-5)T^(2)-0.021T+498.3.由于该方法利用激光烧蚀效应激发出了强度很大的纵波,因此对弹性模量的测量具有较高的精度,估算C_(33)的测量误差不超过0.1%.
The longitudinal ultrasonic wave launched by ns-laser pulse is used to measure the temperature dependence of the elastic modulus C33 of single crystal sapphire.The result shows that in a temperature from room temperature to 1000°C the elastic modulus of sapphire C33 reduces as the temperature increases,following the relationship C_（33） =-1.541 x 10~（-50T^2 - 0.021T ＋ 498.3.In this method,the ablation mechanism is adopted to launch strong longitudinal waves,therefore,the result is accurate that the error of the measurement is estimated to be no more than 0.1%.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第6期273-277,共5页
Acta Physica Sinica
基金
国家自然科学基金(批准号:20973050)资助的课题~~
关键词
激光超声
蓝宝石
弹性模量
高温
laser ultrasonic
sapphire
elastic modulus
high temperature
