This paper presents the results of studies of a photoelectric autocollimator with a detector based on a linear CCD array and a computer as a spectrum analyzer. The threshold sensitivity of the device to the image displacement depends on the SNR. When the SNR equals 250, the threshold sensitivity is 0.134 mu m, which corresponds to a threshold sensitivity to rotation of the test mirror by no more than 0.007". The device makes it possible to determine the power spectrum of the rotational-velocity fluctuations of rotating mirrors, as well as the spectrum of the radiation fluctuations of distant sources. (C) 2008 Optical Society of America.
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