FIELD: measuring equipment.
SUBSTANCE: method includes pointing into sample of subject substance, in mutually opposite directions, of two coaxial laser emission beams, overlapping in space inside subject sample, while appearance of forced Brillouin dispersion emission in substance is provided, measuring space-time distributions of intensiveness levels of beams emission in planes, perpendicular to direction of emission vector, measuring space distribution of intensiveness of emission of auxiliary beam in plane, perpendicular to direction of emission and being a plane of outlet of beam from sample of subject substance, while at least one of beams falling on substance is formed with uneven distribution of emission intensiveness in a plane, perpendicular to direction of emission and being a plane of entering of beams, and coefficient of emission amplification is calculated by numeric method.
EFFECT: higher precision.
6 dwg
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