用于高速摄影机photometry的商用CMOS相机的性能
Performance of commercial CMOS cameras for high-speed multicolor photometry
摘要：
我们提出了一些商业彩色CMOS相机的天文应用的测试结果。CMOS传感器允许同时在三个滤光片中进行测光，与单色CCD探测器相比具有很大的优势。在CMOS传感器中实现的Bayer BGR颜色系统接近Johnson BVR系统。我们演示了从拜耳颜色系统到约翰逊颜色系统的转换。我们用彩色CMOS相机与小型望远镜（11 - 30英寸）配合进行的光度测量显示，在视频模式下，V $\sim$ 9以下的恒星可以以每秒24帧的速度拍摄。使用曝光时间短（10 - 20 ms）的高速CMOS相机，我们可以执行称为“幸运成像”的成像模式。我们可以挑选出高质量的帧，并将它们组合成一个单一的图像使用“移位和添加”技术。这使我们能够获得比长时间曝光拍摄单个图像更高分辨率的图像。对于图像选择，我们使用Strehl选择方法。我们证明了幸运成像技术的优势，与长曝光拍摄相比。大气湍流引起的模糊图像的半高宽可以降低一倍以上。
英文摘要：
We present some results of testing of commercial color CMOS cameras for astronomical applications. CMOS sensors allow to perform photometry in three filters simultaneously that gives a great advantage compared with monochrome CCD detectors. The Bayer BGR colour system realized in CMOS sensors is close to the Johnson BVR system. We demonstrate transformation from the Bayer color system to the Johnson one. Our photometric measurements with color CMOS cameras coupled to small telescopes (11 - 30 inch) reveal that in video mode stars up to V $\sim$ 9 can be shot at 24 frames per second. Using a high-speed CMOS camera with short exposure times (10 - 20 ms) we can perform an imaging mode called "lucky imaging". We can pick out high quality frames and combine them into a single image using "shift-and-add" technique. This allows us obtain an image with much higher resolution than would be possible shooting a single image with long exposure. For image selection we use the Strehl-selection method. We demonstrates advantage of the lucky imaging technique in comparison with long exposure shooting. The FWHM of the blurred image caused by atmosphere turbulence can be decreased twice and more.
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