Dargis A B
Bell Laboratories, 600 Mountain Avenue, Murray Hill, NJ 07974, USA.
Rev Sci Instrum. 1978 Mar;49(3):308. doi: 10.1063/1.1135397.
Optimization of the point source detection properties of a Secondary Electron Conduction (SEC) vidicon TV camera tube as a detector of point light sources such as star fields or certain optical spectra requires the accurate determination of peak height, half-peak width, background, and location of the point image. Two perpendicular Gaussian curves have been used to define a point image, allowing changes in the parameters of these Gaussian curves to be used in the study of SEC vidicon point source properties as a function of electrical and optical parameters. Peak height was shown to depend on priming time and a method was developed to reduce the priming time by almost an order of magnitude by momentarily raising the target voltage during priming. Power supply specifications needed for 0.1 pixel (picture element) addressing accuracy were found to be +/-0.03 V. Focus current was optimized to obtain the best sensitivity and resolution over the entire target. Peak height, background, and half-peak width were found to be strongly dependent on readout beam current. Target voltage, over the limited range examined, was found to affect only the gain without compromising other image parameters, so that any value could be used, consistent with gain and sensitivity required.
将二次电子传导（SEC）视像管电视摄像管作为星场或某些光谱等点光源的探测器，对其点源探测特性进行优化，需要精确测定点图像的峰值高度、半峰宽、背景和位置。已使用两条相互垂直的高斯曲线来定义点图像，通过改变这些高斯曲线的参数，来研究SEC视像管点源特性随电学和光学参数的变化情况。研究表明，峰值高度取决于预燃时间，并且开发了一种方法，通过在预燃期间瞬间提高靶电压，将预燃时间减少近一个数量级。发现实现0.1像素（图像元素）寻址精度所需的电源规格为+/-0.03V。优化聚焦电流以在整个靶面上获得最佳灵敏度和分辨率。发现峰值高度、背景和半峰宽强烈依赖于读出束电流。在所研究的有限范围内，发现靶电压仅影响增益，而不影响其他图像参数，因此可以使用与所需增益和灵敏度一致的任何值。
