A MULTI-RANGE ELECTRONIC APPARATUS FOR MEASURING AND RECORDING PHOSPHORESCENT DECAY.
NAVAL RESEARCH LAB WASHINGTON D C
Pagination or Media Count:
The measurement of the decay time and photographic recording of curves showing decay periods of phosphors from 0.0002 second to several hours is made with the apparatus described. Irradiation of the phosphor by ultraviolet light takes place exterior to the apparatus. A 1P22 or a 1P21 multiplier phototube, in connection with a direct-coupled amplifier and a 5-inch oscilloscope tube, gives a sensitivity sufficient to record the brightness as a vertical deflection. Horizontal deflection is produced by a time-sweep circuit triggered by a 1P28 multiplier tube. Another 1P28 tube is used to control the intensity of the spot on the screen, thus preventing overexposure at the starting point when the transient is recorded on film. A time scale is superimposed on the film by setting the vertical gain to zero and introducing a calibrated time pulse into the vertical amplifier during a given sweep. Multi-range time scales, low brightness sensitivity, and the convenience of recording transients are features of the apparatus. Author