铝基离轴三反系统光机一体化设计

针对红外成像领域离轴三反系统在批产中存在生产效率低、产品一致性差、抗振动和无热化等工程化要求高的问题,本文舍弃传统的手动抛光等加工工艺,以高精度精密数控加工技术为基础,确定零件的形位公差、尺寸公差和面型等参数的加工工艺,采用光机一体化设计方法设计一款用于中长波红外成像的铝基离轴三反系统。系统指标为有效口径150mm,扩束比4倍,视场角28°×24°,工作波段37~48μm和77~103μm。分别介绍了系统的光学设计、无热化设计、消应力设计和轻量化设计结果,并在常温和高低温下对成像效果进行了测试。实验表明,该系统能够满足中长波红外系统的成像需求。

Design aspect of a novel L-shaped pulsed column for liquid–liquid extraction applications: Energy consumption and the characteristics velocity concept

This article deals with the evaluation of the consumption of energy for a steady state solvent extraction in a novel L-shaped pulsed sieve-plate column, which is highly required for design and optimization of the periodic flow processes for industrial applications. In this regard, a comprehensive evaluation on the energy consumption in case of a pulsed flow for three different chemical systems is conducted and besides the influence of pulsation intensity, the effect of geometrical parameters including the plate spacing and the plate free area is investigated as well. Moreover, the concept of characteristic velocity models at flooding points is evaluated with respect to the variation of pressure drop along the column at different operational conditions.