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最近,美国某教授与学生一起研制出两种致偏装置,图1示出这种装置,在两个选加的栅格结构上,利用布喇格衍射效应。这一相对偏转的栅格结构产生于声的表面波,波来自基板上的两个换能器,致转角度取决于声的振动频率。偏折光的强度,如图2曲线所示,也是与声频有关。图3表示,a为未偏折的光线;b 为偏折光在声频变化为155—410兆赫之间,15兆赫级时的位置。
Recently, a professor from the United States developed two deflecting devices with students. Figure 1 shows this device, using Bragg diffraction effects on two optional grid structures. This relatively deflected grid structure results from acoustic surface waves coming from the two transducers on the substrate and the angle of rotation depends on the frequency of vibration of the sound. The intensity of deflected light, as shown in the graph of Figure 2, is also related to audio. Figure 3 shows that a is the undamped light, and b is the position of the deflected light at 15 MHz when the acoustic frequency changes between 155 and 410 MHz.