The experimental results obtained with a ferrofluidic deformable mirror controlled by electro-magnet actuators are presented here. Using a step input through a single actuator, we obtained a steady-state settling time of 100 ms; however, different combinations of overdrive inputs can be used to decrease it to 25 ms. A new technique which consists of laying down an elastomer membrane, coated with an aluminum film, on the ferrofluid is also discussed. By adding the membrane on the ferrofluid, it further decreases the time response by a factor of 2. Furthermore, the thin aluminum layer improves the reflectivity of the mirror. Finally, using the membrane and the overdrive techniques combined, the time response is improved by a factor of 20. Numerical simulations show that ferrofluidic mirrors using membranes and improved electronics should reach settling times of the order of a millisecond. Presumably, even lower settling times could be possible.

这里介绍了由电磁致动器控制的铁磁流体可变形镜获得的实验结果。使用通过单个执行器输入的阶跃，我们获得了100 ms的稳态建立时间。但是，可以使用过载输入的不同组合将其减小到25 ms。还讨论了一种新技术，该技术包括在铁磁流体上铺一层涂有铝膜的弹性体膜。通过在铁磁流体上添加薄膜，可以将时间响应进一步降低2倍。此外，薄的铝层可提高反射镜的反射率。最后，结合使用膜和过载技术，时间响应提高了20倍。数值模拟表明，使用膜和改进的电子器件的铁磁流体反射镜应达到毫秒级的稳定时间。据推测，甚至可以缩短建立时间。