宽带荧光应力传感的特性研究及应用

摘要

文中针对应力传感应用,以YAG：Ce3+荧光粉-硅胶复合材料为敏感材料,研究了其宽带荧光光谱的应力传感特性。在研究的应力范围内,通常用于应力传感监测信号的谱带峰位移动极小,无法被明确地检测到；但发射光谱谱带的重心波长随着压应力的增大而单调地蓝移。实验中测量的压应力范围0~2.94 MPa,谱带重心波长传感应力的分辨率优于0.14 MPa,灵敏度为0.15 nm/MPa。此灵敏度约是已知的相应荧光粉在静水压环境中压谱系数的40倍。该新型的应力传感方法可用于工件表层应力及残余应力的非接触测量,在机械工程领域有良好的应用前景。%For the stress sensing applications,the YAG:Ce3+phosphor-silicone composite as the sensitive material,the stress sensing property of the broadband fluorescence spectrum was studied.In the stress range of this study ,the band peak shift of the stress sensor monitoring signal was extreme small so that can not be observed.However,the barycenter wavelength of the emission spectrum band had a blue shift with increase of compressive stress.In the experiment,the range of the compressive stress was from 0 to 2.94 MPa.The resolution of stress sensing with barycenter signal was smaller than 0.14 MPa.The sensitivity was 0.15 nm/MPa,almost 40 times larger than the known piezo-coefficient of YAG:Ce3+ phosphor in hydrostatic pressure environment.The de-veloped stress sensing method with a band barycenter signal can be used for non-contact measurement of the stress in a material surface,and applications in the field of mechanical engineering can be expected.