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IC693PCM311RR PLC控制器参数
反射式液体透镜是一个焦距可变的镜面。当装有液体(一般是水银)的容器旋转的时候,离心力的作用将使液体表面形成一个正好符合望远镜要求的理想凹面。反射式的液体透镜只需改变旋转速度,就能使液面的形状改变成需要的形状,这可以大大降低制造大型天文望远镜的加工难度和成本。
透射式液体透镜按照液体变焦驱动机制的不同,液体变焦镜头分为物性控制式和机械驱动式,如图1所示。其中,物性控制式变焦镜头包括基于液晶材料、电化学活化、介电泳技术和电润湿技术的液体变焦透镜。机械驱动式变焦镜头包括基于静电力驱动、电磁力驱动、压力调节和环境响应液体变焦透镜。
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