Measurement of non-stationary signals using an acousto-optic spectrometer

This paper discusses measurements of non-stationary optical signals using an acousto-optic spectrometer. Any spectral measurements should take non-stationary forms of optical signals into account. The paper presents the results of experiments where a non-stationary optical beam from an electric spark was used. An acousto-optic tunable filter based on off-axis diffraction in the TeO 2 crystal was used. The total analysis time was approximately 1 sec for an optical signal cycle of 100 Hz. The spectrum had a "black body" shape with distinguished fragments at 572 nm and 471 nm. The paper also proposes a method to increase the accuracy of measurement.