红外光学材料透过率温度特性测量方法  

Measuring method of temperature coefficient of infrared optical material transmittance

作　　者：许荣国[1] 王雷[1] 阴万宏[1] 杨照金[1] 

机构地区：[1]西安应用光学研究所,陕西西安710065

出　　处：《应用光学》2013年第6期1000-1004,共5页Journal of Applied Optics

摘　　要：提出了一种变温条件下红外光学材料透过率测量评价方法。研究内容包括使用准直反射镜将红外光源变为平行光,通过斩波器变为脉冲光,再经滤光片选择波长;使用平面反射镜组与精密温控炉来获得变温条件下的双光路:测试光路与参考光路。使用前置放大电路和锁相放大器对红外微弱信号进行检测,根据两个光路的测量电压计算样品的透过率及透过率温度系数。计算机实现自动控制、采集与相关运算。该方法解决了变温条件下红外光学材料透过率测量中的实际应用问题,使光学材料参数检测从常规检测扩展到高温等极端条件,更接近于材料的实际使用条件,蓝宝石材料在波长5 195nm处,透过率高于10%,温度从室温到700℃的范围内,重复性优于0.2%。A new transmittance measurement and assessment method of the infrared optical material at diffident temperatures was proposed. A collimation reflect mirror was used to make the infrared light source into the parallel light, and then a chopper was used to make the continuous light into the pulse light, besides, a special wavelength was obtained by filter. A special data acquisition system that in- eluding a preamplifier circuit, a lock-in amplifier, a computer and a control software could calcu late the value of infrared transmittance and give the temperature coefficient of the optical mate- rial by means of double light beam contrast measurement. The method resolved problems of in- frared transmittance measurement of optical material in actual operational environment, like high temperature. Test result shows the transmittance of sapphire material is higher than 10% at the wavelength of 519 5 nm, and the repeatability is better that 0.2% from room temperature up to 700℃. The method has great economic and social utility.

关 键 词：斩波法 双光路 透过率 温度系数 

分 类 号：TN219[电子电信—物理电子学]