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Abstract. Recently, multiwave dynamical theory of neutron diffraction by a moving grating was developed. The theory predicts that at a certain height of the grating profile a significant suppression of the zero-order diffraction may occur. The experiment to confirm predictions of this theory was performed. The resulting diffracted UCNs spectra were measured using time-of-flight Fourier diffractometer. The experimental data were compared with the results of numerical simulation and were found in a good agreement with theoretical predictions.

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The work is devoted to the study of the measurement accuracy of the spatial frequency domain imaging system for the detection and objective numerical evaluation of optical inhomogeneities in biological tissues. As a result of the initial stage of experimental studies on a stand simulating a spatial frequency domain imaging system, the operating range of spatial frequencies of illuminating irradiation modulation was determined, which ensures maximum reproducibility of the measurement results, and the possibility of achieving a relative measurement error of optical parameters of no more than 10% was shown