Acoustic wind measurement

A wind measurement apparatus comprising:

• a cover portion and a base portion arranged at a distance from each other to allow for an airflow therebetween;
• an arrangement of N receivers disposed on a base-portion-facing side of the cover portion in respective positions that serve as respective vertices of a convex regular polygon of order N, where Nis at least three;
• a transmitter disposed on the base-portion facing side of the cover portion in a position that is at a substantially equal distance from each of the N receivers;
• and
• a reflector assembly arranged on a cover-portion-facing side of the base portion, wherein the reflector assembly is divided into N concave reflector portions,
• wherein each receiver is associated with one of the reflector portions and wherein the reflector assembly and the base portion are disposed with respect to each other such that the transmitter is spatially aligned with a center point of the reflector assembly and that each receiver is spatially aligned with the associated reflector portion,
• wherein the transmitter is arranged to transmit a measurement signal in a transmitter beam, TX beam, towards the reflector assembly such that the TX beam meets each of the reflector portions, and
• wherein each of the receivers is arranged to receive, via the associated reflector portion, a reflection of a TX beam portion that meets the respective reflector portion.