空间光调制器的生态景观照明光束控制方法

Control Method of Ecological Landscape Lighting Beam Based on Spatial Light Modulator

受光束偏转角度的影响,照明光束会出现不同程度的偏转,为提升照明效果与稳定性,提出基于空间光调制器的生态景观照明光束控制方法。根据菲涅尔波带透镜与标量衍射理论推算出焦点方位,通过平移相位图完成聚合点空间方位的更改,得到各个路径与聚合点之间的距离差。经过求解相应空间光调制器的像素数量,取得每个像素对应的相位值,根据输入电压与亮度曲线存在的非线性关系,计算聚合点的移动距离极大值与极大偏转度数,并采用相位级数提升调制器的衍射效率。采用琼斯矩阵描述光束偏振态,通过各模块的琼斯矩阵表达式,获取输出光束形式,从而实现光束控制。实验结果表明,所设计方法不仅能够有效获取光束偏转点,而且可以控制输出光线,稳定性较好,提升了控制效果。

Due to the influence of beam deflection angle,the illumination beam will be reflected in different degrees.In order to improve the lighting effect and stability,a beam control method based on spatial light modulator for ecological landscape lighting is proposed.According to the Fresnel zone lens and scalar diffraction theory,the focal position can be calculated,and the spatial orientation of the aggregation point can be changed by translating the phase diagram,and the distance difference between each path and the aggregation point can be obtained.After solving the number of pixels of the corresponding spatial light modulator,the phase value corresponding to each pixel is obtained.According to the non-linear relationship between the input voltage and the brightness curve,the maximum moving distance and the maximum deflection of the aggregation point are calculated.The diffraction efficiency of the modulator is improved by using the phase series.The Jones matrix is used to describe the polarisation state of the beam,and the output beam form is obtained through the Jones matrix expression of each module,thereby achieving beam control.Experimental results show that the designed method can effectively obtain the beam deflection point and control the output light,which has better stability and improves the control effect.