光学学报, 2018, 38 (12): 1231001, 网络出版: 2019-05-10
红外热成像甲烷探测系统的双通带滤波器 下载: 1129次
Dual-Bandpass Filter in Infrared Thermal Imaging System for Methane Detection
薄膜 滤波器 红外热成像 拆分技术 聚集密度 膜层敏感度 thin films filter infrared thermal imaging splitting technique gather density film layer sensitivity
摘要
基于甲烷的红外吸收光谱,通过光谱拆分法实现了一种双通带滤波器的设计。通过调节离子源束流,改善了ZnS膜层的折射率,消除了背景噪声。通过引入可控薄层,降低了非周期窄带通膜系的制备难度。经实验测试与分析,所研制的双通带滤波器在3.31 μm和7.67 μm的透射率分别为89.25%、81.97%,达到了提高探测系统灵敏度的目的。
Abstract
Based on the infrared absorption spectrum of methane, a dual-bandpass filter is designed by the spectral splitting. With the adjustment of ion source beams, the refractive index of the ZnS film layer is improved and the background noise is eliminated. The fabrication difficulty of aperiodic narrow-bandpass filter films is reduced by the introduction of controllable thin film layers. The experimental test and analysis show that the prepared dual-bandpass filter possesses the transmissivity of 89.25% at 3.31 μm and 81.97% at 7.67 μm, respectively, and the goal for improving the sensitivity of detecting systems is achieved.
付秀华, 刘文奇, 尹士平, 刘克武, 刘冬梅. 红外热成像甲烷探测系统的双通带滤波器[J]. 光学学报, 2018, 38(12): 1231001. Xiuhua Fu, Wenqi Liu, Shiping Yin, Kewu Liu, Dongmei Liu. Dual-Bandpass Filter in Infrared Thermal Imaging System for Methane Detection[J]. Acta Optica Sinica, 2018, 38(12): 1231001.