Hewitt A V, Charman W N
Oxford University Department of Astrophysics.
Appl Opt. 1968 Apr 1;7(4):603-6. doi: 10.1364/AO.7.000603.
An image intensifier system centered round a four-stage cascade intensifier, EMI type 9694, is described, the image being recorded by a moving plate camera. Astronomical observations were made on the coudé spectrograph of a 30-in. (76-cm) telescope; the dispersion in the blue was 3 A mm(-1). The system was found to be capable of spectrophotometry, the limiting stellar magnitude being 9, and showed considerable gains over alternative techniques in high time resolution observations.
描述了一种以四阶段级联增强器（EMI 9694型）为核心的图像增强系统，图像由移动平板相机记录。在一台30英寸（76厘米）望远镜的卡焦摄谱仪上进行了天文观测；蓝光波段的色散为3埃/毫米⁻¹。该系统被发现能够进行分光光度测量，极限星等为9等，并且在高时间分辨率观测方面比其他技术有显著优势。
