角度位置自动识别的红外折射率测量

为准确快速获得块体硫系玻璃红外波段的折射率,搭建了基于类准直测量法的折射率测量系统。该系统采用液氮制冷的碲镉汞探测器和特殊的光路实现了光强信息的高分辨采集,使用高分辨数据采集卡将角度信息数字化,利用精密步进电机传动控制系统实现了光强信号与位置信号的同步记录。开发的测量软件可自动判别光强峰位信息,自动计算获得待测样品的折射率。对比测试Ge_(20)Sb_(15)Se_(65)、Ge_(28)Sb_(12)Se_(60)、As_2S_3和As_2Se_3商用硫系玻璃在3.39μm和4.8μm处的折射率。实验结果表明,该装置系统测量折射率的标准偏差为10~(-3),测量不确定度为0.002 9,可快速、准确测量块体材料红外波段的折射率。

Measurement of infrared refractive index based on angle location automatic recognition

In order to determine the refractive index of bulk glasses in the infrared band, a refractive index measurement system based on the optical auto-collimation principle is proposed. We use a liquid-nitrogen-cooled mercury telluride detector and a special optical architecture to collect high-resolution light intensity information. The angle information is converted to digital information by a data acquisition card. A precision stepper motor drive control system is used to synchronize the light intensity signal and the position signal. The software automatically determines the peak position of the light intensity, and automatically calculates the refractive index of the sample. The refractive indices of the Ge₂₀Sb₁₅Se₆₅, Ge₂₈Sb₁₂Se₆₀, As₂S₃ and As₂Se₃ commercial chalcogenide glasses were measured at 3.39 μm and 4.8 μm. The standard deviation of the refractive index measurement system is 10^-3 with a measurement uncertainty of 0.002 9. The system can be useful to quickly and accurately measure the refractive index of bulk materials in the infrared band.