基于无阀压电微泵控制的微流控液体变色眼镜

Microfluidic liquid color-changing glasses controlled by valveless piezoelectric micro-pump

为了更好地利用变色镜保护人眼不受强光的伤害,提出了一种微流控液体变色眼镜。以透光性良好的高分子聚合物PDMS(polydimethylsiloxane)为材料,采用软刻蚀技术代替传统的机械加工,制作了具有微流道结构的镜片变色层。通过对封接面的表面改性处理实现了PDMS变色层和基底镜片(玻璃/光学树脂)之间的不可逆封接,构成了具有闭合微流道的液体变色镜片。设计并制作了一种无阀压电微泵控制器用以控制镜片微流道内有色液体的循环流动,实现镜片的变色功能。实验测试了微泵在不同驱动电压和驱动频率下变色眼镜的响应特性。测试结果表明:与传统的固体感光变色镜相比,无阀压电微泵控制的微流控液体变色眼镜具有较快的响应速度,较高的可控性和良好的可逆性。

In order to comfort and protect human eyes in an environment with strong lights using color-changing glasses, a microfluidic liquid color-changing glasses is presented. Instead of traditional mechanical machining, soft lithography technology is applied for the fabrication of the color-changing layer made of transparent polymer polydimethylsiloxane （PDMS）. Surface modification treatment is used for realizing irreversibly bonding of PDMS color-changing layer with substrate lens （glass/optical resin） to form liquid color-changing lens with closed microfluidic channels. A valveless piezoelectric micro-pump is designed and micromachined, which is used to control the liquid circulation in the channel on the lens to realize color-changing function of the glasses. The color-changing response times of the glasses under different voltage amplitudes and frequencies are tested by experiments. Compared with conventional solid photochromic glasses, the microfluidic liquid color-changing glasses controlled by valveless piezoelectric micro-pump show faster response, higher controllability and better reversibility.