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A rotating attenuator for the generation of subsecond duration sawtooth shape radian~e pulses is described. The attenuator disk is in the form of a cam. The geometry of the opem~g of .a diaphragm used as the aperture stol? deter.mines the shape of .the radiance pulses .. Radla~ce IS determined from the measurements wIth a hlgh·speed photoelectrIc pyrometer. Recordmg of SIgnals is made with a high·speed dig ital data acquisition system. Th e combin ed measuring ~nd r ecordIng systems have a full· scale signal resolution of appro~imately o.ne part in 8000 and a tune resolutIOn of 0.4 ms. Two different diaphragms are used m thIS study Yleldmg radIance pul ses <.20 to 150 ms long ) with linear and quadratic ri se. The standard deviation of the experimental pomts from the p ertin ent functions describing the radiance variation is less than 0.5 percent.

Rotating optical attenuator for the generation of subsecond duration sawtooth shape radiance pulses