Method for the non-contact particle size analysis of a granulate (3), wherein the granulate (3) is surrounded by an ambient medium (2), comprising the following steps: a) irradiating the granules (3) with electromagnetic radiation, the electromagnetic radiation having a terahertz radiation b) detecting an intensity of the radiation scattered on particles of the granulate (3) from different angles for detecting the angle-dependent intensity distribution of the scattered radiation, c) determining particle sizes by means of the intensity distribution, the surrounding medium ( 2) is analyzed before the irradiation of the granules (3) and the wavelength of the electromagnetic radiation is selected on the basis of a transmission band characteristic of the surrounding medium (2).
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