红外技术2026，Vol.48Issue(9)：1047-1057,11.
刀片虹膜式变F/数红外探测器F/数计算及验证
Calculation for F-number of Blade Iris Variable F-Number Infrared Detector
李明 1甘游宇 2孙鸿生 2夏明 2徐世春 1马子惟 1龙荃1
作者信息
- 1. 昆明物理研究所,云南 昆明 650223
- 2. 昆明物理研究所,云南 昆明 650223||红外探测全国重点实验室,云南 昆明 650223
- 折叠
摘要
Abstract
To meet the demand for high-precision,stepless adjustment of infrared detectors in the front-end optical system of variable F-number systems,establishing an accurate mapping relationship between the target F-number of the detector and the rotation angle of the movable ring is necessary to calculate the actuation quantity according to the desired F-number.For an irregular aperture composed of multiple circular arcs formed by the blade iris structure,the inscribed circle was taken as an approximation of the aperture,and the functional relationship between the F-number and rotation angle of the movable ring was derived based on geometric principles.Polar coordinate modeling was conducted for the actual irregular aperture,and the analytical expression of the aperture area was obtained using the integral method after determining the boundary conditions.The concept of an equivalent F-number was introduced to compare the differences between the two aperture calculation approaches.The experiments analyzed the variation trends of the difference and relative error between the inscribed circle area and the actual aperture area,and the relative error trend of the equivalent F-number was clearly demonstrated.Using a certain type of variable F-number infrared detector developed by the Kunming Institute of Physics as the test object and a video measuring instrument as the measurement tool,the F-number test experiments verified the correctness and effectiveness of the established mapping relationship.A theoretical basis and engineering reference for high-precision F-number switching control of variable-F-number detectors was provided in this study.关键词
刀片虹膜式可变冷光阑/变F/数红外探测器/F/数计算方法/F/数误差分析/等效F/数Key words
blade-type iris-type variable cold aperture/variable F-number infrared detector/F-number calculation method/F-number error analysis/equivalent F-number分类
信息技术与安全科学引用本文复制引用
李明,甘游宇,孙鸿生,夏明,徐世春,马子惟,龙荃..刀片虹膜式变F/数红外探测器F/数计算及验证[J].红外技术,2026,48(9):1047-1057,11.
