密度可以解释熔融金属的性质和行为,密度的变化特征反映了熔融金属内部原子距离和配位数等的基本变化。研制了一种测量熔融金属密度的浮子式光纤Bragg光栅传感器,浸没在熔融金属中的浮子受浮力作用,通过传递杆、等臂杠杆及连杆,拉动等强度悬臂梁产生扰度变化,根据检测粘贴在等强度悬臂梁表面的光纤Bragg光栅中心波长移位值,测出浮力值,进而检测熔融金属密度。该传感器的理论灵敏度为0.115pm/(kg/m3),4次实验得到熔融金属的平均密度为7.574×103 kg/m3,略小于理论密度7.621×103kg/m3,相对误差为0.62,均方根误差为117.371kg/m3。 Density can explain the nature and behavior of the molten metal. The changing characteristics of the density reflect the basic changes in the distance and coordination number of the atoms in the molten metal. A float fiber Bragg grating sensor for measuring the density of molten metal was developed. The floater immersed in the molten metal was subjected to buoyancy force. The intensity of the cantilever beam was changed by the transmission rod, the arm lever and the connecting rod. According to the detection Paste the same wavelength of the center wavelength of the fiber Bragg grating on the surface of the cantilever beam, and measure the buoyancy value to detect the density of the molten metal. The theoretical sensitivity of the sensor is 0.115pm / (kg / m3). The average density of molten metal in four experiments was 7.574 × 103 kg / m3, slightly less than the theoretical density of 7.621 × 103kg / m3 with a relative error of 0.62. The error is 117.371kg / m3.