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(一)引言在红外热成像仪器中,常常采用光学机械扫描系统,使探测器按一定的规律,依次接收到被观察空间各物点发出的红外辐射,探测器将接收到的红外辐射转变为电信号,经电子线路放大,再通过显示装置,给人们一幅反映景物温度高低的并与原物相似的可见图像。实用的扫描系统给出的扫描规律必须是线性的或接近于线性的。非线性的扫描会使图像失真,甚至会给出错误的判断,但是线性扫描规律并不总是可以实现的,是有条件的。用作扫描系统的光学元件,除了完成扫描任务之外,会产生一定数量的像差。有时候扫
(1) Introduction In infrared thermal imaging instruments, optical mechanical scanning system is often used to make the detector according to a certain rule, sequentially receive the infrared radiation emitted by each object point of the observed space, the detector converts the received infrared radiation into Electrical signals, amplified by the electronic circuit, and then through the display device to give people a reflection of the scene temperature level and the original similar to the visible image. The scanning rules given by a practical scanning system must be linear or nearly linear. Non-linear scan will make the image distorted, and even give a wrong judgment, but the linear scan law is not always achievable, there is a conditional. Used as a scanning system optical components, in addition to the completion of the scanning task, will produce a certain amount of aberration. Sometimes sweep