红外图像和红外摄像的区别
希望全面一些 还有红外图像的发展历史 谢谢!!
推荐回答(1个)
红外图像是利用红外热像仪接受来自目标和景物的红外辐射,经过光电转换,将不可见
的辐射转变成可见的图像,图像的各像素点的明暗(亮度)变化对应着目标和景物的辐射能
量强弱的变化.目前红外图像在军事上的应用越来越多,例如在精确制导方面,更多的防空
导弹采用了红外成像制导,使其具备了其它制导方式无法替代的优势.但日常情况下,红外
图像热像仪的使用范围受到很大的限制,空战环境下的动态红外图像来源就更是很少,为便
于对空战红外环境的研究,本文提出利用分析空战环境中景物的红外辐射规律(并参考实际
红外照片或录像),对比得出空战环境中各景物间的相对辐射规律及其在红外图像上个像素
的对比明暗反映,制作和显示出各种需要的环境条件下动态红外背景图像.
红外线摄像机的原理特性
光是一种电磁波,它的波长区间从几个纳米(1nm=10-9m)到1毫米(mm)左右。人眼可见的只是其中一部分,我们称其为可见光,可见光的波长范围为380nm~780nm,可见光波长由长到短分为红、橙、黄、绿、青、兰、紫光,波长比紫光短的称为紫外光,波长比红外光长的称为红外光。
红外灯按其红外光辐射机理分为半导体固体发光(红外发射二级管)红外灯和热辐射红外灯两种。一般市场上主要采用红外发射二极管的红外灯,其原理及特性我们介绍如下: 由红外发光二级管矩阵组成发光体。红外发射二级管由红外辐射效率高的材料(常用砷化镓GaAs)制成PN结,外加正向偏压向PN结注入电流激发红外光。光谱功率分布为中心波长830~950nm,半峰带宽约40nm左右,它是窄带分布,为普通CCD黑白摄像机可感受的范围。其最大的优点是可以完全无红暴,(采用940~950nm波长红外管)或仅有微弱红暴(红暴为有可见红光)和寿命长。红外发光二极管的发射功率用辐照度μW/m2表示。一般来说,其红外辐射功率与正向工作电流成正比,但在接近正向电流的最大额定值时,器件的温度因电流的热耗而上升,使光发射功率下降。红外二极管电流过小,将影响其辐射功率的发挥,但工作电流过大将影响其寿命,甚至使红外二极管烧毁。针对这一情况,富视康公司FI-930C和FI-970C在设计时充分考虑了这个问题,采用高效率发光二极管,在摄像机里面内置散热系统,使摄像机稳定工作时间达到25000小时!
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