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 Å 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.
A. V. Hewitt and W. N. Charman, "The Use of a Cascade Intensifier in Coudé Spectroscopy," Appl. Opt. 7, 603-606 (1968)