公开(公告)号：US20240210440A1

公开(公告)日：2024-06-27

申请号：US18391197

申请日：2023-12-20

Applicant: Vaisala Oyj

Inventor： Joonas KEITAANNIEMI ,  Seppo MÄKINEN ,  Tuomas FOGELBERG

IPC: G01P5/24

CPC classification number: G01P5/245

Abstract: A wind measurement apparatus includes: base and cover portions; N transducers disposed on the base portion in positions that serve as vertices of a convex regular polygon of order N (N≥3); and a reflector assembly arranged on the cover portion. The reflector assembly is divided into N substantially identical concave reflector portions. The reflector assembly and the base portion are disposed such that center points of the reflector assembly and the polygon are spatially aligned and each of the N transducers is spatially aligned with a respective boundary between two adjacent reflector portions. Each transducer is arranged to: transmit a TX beam towards the reflector assembly such that the TX beam meets the adjacent reflector portions on opposite sides of the respective boundary, and receive, via said adjacent reflector portions, partial reflections of the TX beams originating from those of the N transducers that are adjacent to the transducer.

公开(公告)号：US20200103329A1

公开(公告)日：2020-04-02

申请号：US16591337

申请日：2019-10-02

Applicant: Vaisala Oyj

Inventor： Jan LÖNNQVIST ,  Seppo MÄKINEN

IPC: G01N15/04

Abstract: An example forward scatter sensor comprises: a transmitter to emit a light sheet; a receiver to observe light scattered from particles that fall through a measurement volume; and a control entity comprising an analyzer to record a measurement signal descriptive of intensity of light captured by the receiver as a function of time and to: carry out a precipitation analysis on basis of a time segment of the measurement signal; carry out a verification of analysis performance based on magnitudes of first peaks of at least one identified double peak and on respective residence times for said at least one identified double peak; and invoke a predefined maintenance action responsive to said verification indicating a threshold-exceeding difference between respective size estimates derived based on magnitudes of the first peak of said at least one identified double peak and based on residence times of said at least one identified double peak.