激光散斑法测量有机玻璃物体微形变研究

Research on micro-displacement of organic glass by laser speckle measurement

通过设计激光散斑干涉测量系统,详细分析了激光散斑图像位相变化,以及有机玻璃离面微位移与干涉黑条纹序数和激光波长的关系。在激光散斑测量物体微形变系统中,应用物品架旋钮施加压力于有机玻璃,在632.8nm氦氖激光垂直入射于物品后,物品架旋钮分别减少6格、2格、2格,有机玻璃所受压力随之减小。在不同压力作用下有机玻璃所产生的微形变发生变化,通过CCD记录和计算机数据采集卡采集物体形变前后产生的激光散斑图样,经数值分析与计算,得到3种压力下物体的离面位移分别为1 898、1 264和632nm。得出随着有机玻璃施加压力的变小,离面位移微形变也变小的结论,为后续激光散斑压力传感器的研制提供了有效参考依据。

In this paper,a laser speckle interference system was designed and used to analyze the phase changes of the laser speckle graphs,the micro-displacement deformation of the organic glass and the relationship between the black interference fringes＇ordinal number and the laser wavelength in detail.In this micro-deformation measurement system,the organic glass was exercised on the pressure by rotating the knob,and the pressure decreased gradually when the knob was rotated by 6latices,2latices and 2latices respectively with normal incidence of the 632.8nm laser.As a result,the micro-deformation under the different pressure and the corresponding the speckle graphs before and after pressure applied were recorded by means of CCD and data acquisition card.The microdisplacements were calculated as 1 898 nm、1 264 nm、632 nm respectively under this three conditions.It was concluded that the displacement of the organic glass became larger with the increase of the applied pressure on the organic glass,and offer an effective data for the further research on the laser speckle pressure sensor development.