FIELD: physics.
SUBSTANCE: method involves surface sounding of surface by means of spatial and coherent broad-band optic radiation of visible band with spectrum band Δλ, (400-750 nm); at that, sounding is performed by division of radiation into two beams - measuring and support. Radiation reflected back from the picture is mixed with radiation of support beam, which is reflected back from broad-band mirror, and by means of dispersion element and photodetector there measured is spectral dependence of intensity of optic radiation reflected from art picture from specified depths of fixed volume determined by the product of length of longitudinal coherence of radiator ΔLC by size of focal spot of measurement optic beam.
EFFECT: invention allows identification of art pictures on the basis of contact-free determination of three-dimensional colour not only external, but also internal ones.
3 cl, 9 dwg
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