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开展了用于新型激光驱动马达的环形定子的激光致表面波机理及实验研究.提出一种带有凹槽阵列结构的环形定子新设计,建立了激光在环形定子表面激发表面波的物理模型,揭示了影响表面波幅值的关键因素;采用一种新颖的激光致表面波可视化探测方法,在波长1053 nm,脉宽30 ns,单脉冲能量1 mJ的激光激发下,对表面波在铜质环形定子表面的传播特性进行了可视化探测实验.理论与实验研究表明:当激发光斑的位置紧邻凹槽阵列时,沿着圆环向凹槽方向传播的表面波会被齿状凹槽阵列迅速衰减和吸收,而沿着圆环向远离凹槽方向传播的表面波能够持续传递,从而首次实现了激光致表面波在环形定子上的单向传播;而对没有凹槽阵列结构的圆环进行的对比实验表明,激光致表面波在圆环表面双向传播,最终因相互混叠和串扰等而处于混乱状态.由激光在该种环形定子表面激发出的单向表面波,可望在光致表面波马达及驱动机构中获得应用.
A laser induced surface wave (SAW) mechanism and experimental study of a ring-shaped stator for a new type of laser-driven motor are carried out.A new design of a ring-shaped stator with a groove array structure is proposed, and a physical model of surface excitation by a laser on a ring- The key factors influencing the amplitude of the surface wave are revealed. By using a new method of laser surface acoustic wave visualization, the surface wave is excited by a laser at a wavelength of 1053 nm with a pulse width of 30 ns and a single pulse energy of 1 mJ. The experimental results show that when the position of the excitation spot is close to the groove array, the surface wave propagating along the ring toward the groove will be rapidly attenuated by the dentate groove array And absorption, while the surface wave propagating away from the groove along the ring can be transmitted continuously, so that the unidirectional propagation of the laser induced surface wave on the ring stator is realized for the first time; and for the ring without the groove array structure Comparative experiments show that laser induced surface wave propagation in the two-way ring, and eventually due to mutual aliasing and crosstalk, etc. in a chaotic state by the laser in the annular stator surface Unidirectional wave emitted light is expected to find application in Surface wave motor and the driving mechanism.