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A rotating wavelength-independent optical attenuator is described that generates four radiance steps. Radiance ratios between the steps can be continuously varied. Experiments are performed to assess the operational characteri sti cs of the attenuator. Radiance is determined from measurements with a high-speed photoelec tric pyrometer. Recording of signals is made with a high-speed digital data acquisition system. The combined measuring and recording systems have a full-scale signal resolution of approximately one part in 8000 and a time r esolution of 0.4 ms. The results of several experiments on radi ance ratio measurements are found to be in agreement within one part in 1000.

Rotating adjustable transmission optical step attenuator