Thermal Compensation Analysis Of Infrared Lenses With Mechanical Passive Temperature Adaption

With the development of IR technology, IR system has been asked to adapt to higher requirements.The influence of temperature changes to the IR system is one of the great importance factor than any other.Compared to visible light system/when it works out of the range of operation temperature the IR system has more defocused so that image can not perform well.As a result,thermal compensation technique shouled be essential to temperature adaption IR optics systemIn this paper, sleeve termal compensation structure was designed to compensate defocused in the high and low temperature after summarizing the development of design method for temperature adaption technique. According to the design process of sleeve thermal compensation structure,the mathematical model and appropriate solver program has been established.The coefficient of thermal expansion range of compensation element was initially identified by result of the program. According to the result choose the thermal compensation element material.Determination the coefficient of thermal expansion by experiments. And the process of thermal expension has been emulated at the same time.Then the sleeve termal compensation structure was used in two mechanical passive temperature adaptive IR lens. The initial structure was designed by the result of the program.Detemine the processing structure after optimization and clearance design.Finally the result of imaging experiments and MTF test experiments show that: The defosed was effectively compensated by used the sleeve termal compensation structure in the lens,It also describes the design process can be used in engineering and extended in similar IR products.