长波碲镉汞红外探测器低光通量下的性能研究

为了评价n-on-p长波碲镉汞红外焦平面探测器在低光通量下的性能参数,搭建了低光通量测试平台。首先,介绍了低光通量测试平台相关情况,并对器件的暗电流测试结果进行了分析。然后,在低光通量测试平台上对长波碲镉汞红外探测器在低光通量下的黑体响应性能。最后,对比分析不同光通量下性能参数如响应率、波段探测率性能参数的变化,并给出了器件工作温度改变对器件性能影响的结果。测试结果表明,对于10.8μm@50K的碲镉汞焦平面探测器,在器件工作温度50K,光通量密度为5.8×10^(14)ph·s^(-1)·cm^(-2)条件下,器件波段探测率达到峰值1.5×10^(12)cm·Hz^(1/2)·W^(-1),此时探测率不再随积分时间的增加而提高。实验计算结果及相关参数可为探测器应用提供参考。

2- DFourier Transform Method for Optical Measurement of 3 - DSurface

A method of 2-D Fourier transform used in 3-D surface profilometry is proposed,analyzed and compared with 1-D Fourier transform method in theory and practical measuring result.It was proved that the 2-D Fourier transform method has more advantages over 1-D Fourier transform method in biggest crook-rate limits,accuracy and sensitivity of measuring.Study on measuring object surface details with large crook-rate changing accurately used new higher-power index low-pass filter of spatial frequency domain.A new method of automatic produced reference grating image and error-correcting is proposed.One undeform row of deform grating image is used to extend a complete reference grating image,and some error-correcting method is used to process the result to get accurate surface shape and the deflection of reference surface normal line deviated from the axle of camera.By this new method,one deform rectangle grating image is only used to get the 3-D shape accurately.