ACOUSTIC WIND MEASUREMENT

According to an example embodiment, a wind measurement apparatus (100) is provided, the apparatus (100) comprising: a base portion (110) and a cover portion (120) arranged at a distance from each other; an arrangement of N transducers (112) disposed on a cover-portion-facing side of the base portion (110) in respective positions that serve as respective vertices of a convex regular polygon of order N, where N is at least three; and a reflector assembly (122, 222) arranged on a base-portion-facing side of the cover portion (120), wherein the reflector assembly (122, 222) is divided into N substantially identical concave reflector portions (122-n), 222-n) that are provided as respective recesses on the base-portion-facing surface of the cover portion (120), wherein the reflector assembly (122, 222) and the base portion (110) are disposed with respect to each other such that a center point of the reflector assembly (122, 222) is spatially aligned with a center point of said convex regular polygon and that each of the N transducers (112) is spatially aligned with a respective boundary between two adjacent reflector portions (122-n, 222-n), and wherein each transducer (112-n) is arranged to: transmit a respective ultrasonic measurement signal in a respective transmitter beam, TX beam, towards the reflector assembly (122, 222) such that the respective TX beam meets the two adjacent reflector portions (122-n, 222-n) on opposite sides of the respective boundary with which the respective transducer (112-n) is spatially aligned, and receive, via said two adjacent reflector portions (122-n, 222-n), respective partial reflections of the respective TX beams originating from those ones of the N transducers (112) that are adjacent to the respective transducer (112-n).