红外系统变倍机构研究与分析

红外系统具有成像质量好、探测灵敏度高、信噪比高、抗干扰能力强以及探测距离远等优点,在军事、民用等各个领域得到广泛应用。红外系统对目标进行搜索与探测时,对多视场或连续变焦光学系统的需求日益增强,其中一个措施就是改变两个或两个以上透镜在光学系统中的位置,从而改变光学系统的焦距。从机械设计的角度出发,对几种变倍机构的构型、工作方式及设计要点进行较详细的说明,给出其各自的适用范围和优缺点,为红外热像仪的工程设计提供参考和依据。

Study on Varifocal Mechanism Design for Infrared System

Since infrared (IR) system has some advantages such as good image qualiltyhigh signal to noise ratio (SNR)strong anti jamming ability and long distance detectionit has found a wide application in a lot of areas.When the IR system is used for target search and detectionthere is an increasing demand for multiple FOVs or zoom lens optical system.One method is changing two or more lenss location in order to change focal length in optical system.Based on the mechanical designthe configurationworking mode and design of the several varifocal mechanisms are introduced in detail.The applicable rangeadvantages and disadvantages of them are givenwhich may supply a reference for engineering design of the infrared thermal imager.