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军用光学仪器大都工作在一定的环境温度范围内,温度变化将导致光学系统的像面离焦,成像质量明显下降,必须采取有效的温度补偿措施。介绍了多种无热补偿方式,如机电被动、光学被动和机械被动三种无热补偿方法,并且给出设计实例。提出一种新的补偿方法,利用热双金属进行机械被动补偿,使成像质量明显提高。计算和仿真结果表明,采取该方案补偿后的光学系统,在温度变化时像面与壳体依然保持相对稳定,即可以自动消除环境温度变化造成的像面离焦。这对红外光学系统的无热化设计具有重要的意义。
Most of the military optical instruments work in a certain range of ambient temperature. Temperature changes will cause the image plane of the optical system to be out of focus, and the image quality will obviously decrease. Therefore, effective temperature compensation measures must be taken. Introduced a variety of non-thermal compensation methods, such as mechanical and electrical passive, optical passive and mechanical passive three thermal-free compensation method, and gives the design examples. A new compensation method is proposed, which uses the thermal bimetallic mechanical compensation to improve the imaging quality obviously. The calculation and simulation results show that the optical system compensated by this scheme can maintain the relative stability of the image plane and the casing when the temperature changes, that is, the image plane defocus caused by the change of ambient temperature can be automatically eliminated. This is of great importance to the non-thermal design of infrared optical systems.