Fig. 1. Diagram of laser beam transmission changed by rotating glass sheet.旋转玻璃片改变激光光束位置示意图

Fig. 2. LIF imaging setup based on the SLIPI technique (A1, 5 × beam expander; RG, Ronchi grating; AR, automatic rotary table; GS, glass sheet (5.3 mm); LS, light system; A, aperture slot; RB, Rhodamine B solution; PF, fliter).基于结构光照明技术的激光诱导发光图像测量装置(A1, 5×扩束镜; RG, Ronchi光栅; AR, 自动旋转台; GS, 玻璃片(5.3 mm); LS, 片光系统; A, 光阑; RB, 罗丹明B溶液; PF, 滤光片)

Fig. 3. Simulation process of the PS-SLIPI method: (a) The modulated amplitude value, A; (b) the intensity without grating modulation, S_NG = A(R) + B₁(R) + B₂(R); (c) the intensity with grating modulation, S_C; (d) the relative error of modulated amplitude value, A, calculated by LA-SLIPI method, dA = (A₁ – A)/A, f_c = 0.005 Hz; (e) the error of modulated amplitude value, A, calculated by PS-SLIPI method, dA = AA – A, n = 3; (f) the error of interference components calculated by PS-SLIPI method, dB = BB – B, n = 3. PS-SLIPI方法仿真计算全过程　(a) 调制振幅项A的值; (b) 无光栅调制时的强度值S_NG = A(R) + B₁(R) + B₂(R); (c) 光栅调制后的强度值S_C; (d) LA-SLIPI计算后的振幅相对误差值dA/A = (A₁ – A)/A, 截止频率f_c = 0.005 Hz; (e) PS-SLIPI计算后的振幅误差值dA/A = AA – A, n = 3; (f) PS-SLIPI计算后的干扰分量误差值dB = BB – B, n = 3

Fig. 4. Grating fringe changing images based on phase shifting SLIPI method.PS-SLIPI方法的光栅条纹移动图像

Fig. 5. (a) Conventional (raw data) LIF images without grating modulation in three different measurement cases; (b) LIF images with grating modulation; (c) images of modulated amplitude value, A, calculated by phase shifting SLIPI method. (a) 三种不同测试环境下的原始LIF图像; (b) 光栅调制LIF图像; (c) PS-SLIPI方法处理后的调制振幅(A)分布图像

Fig. 6. (a) LIF images with grating modulation; (b) images of modulated amplitude value, A, calculated by LA-SLIPI method. (a) 不同测量时刻下的光栅调制LIF瞬态图像; (b) LA-SLIPI方法处理后的调制振幅(A)分布的瞬态图像

Table 1. Experimental parameters of two SLIPI technique.