When using the IR sensor, the size of the target in the imaging plane of the camera is only one pixel or several pixels and the signal received is very weak when the target is far away in distance.
对于红外传感器来说，当距目标很远时，目标在成像平面上仅占一个或几个像素，且接收到的信号很微弱。
In this system the axis of the camera always aims at the moving optical probe to ensure the probe imaging in the center of the image plane.
该系统中引入了一个转动平台带动相机运动，使相机光轴始终对准运动的光学测头中某一个光点，保证光学测头成像在畸变比较小的像面中心附近。
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