公开(公告)号：US12203806B2

公开(公告)日：2025-01-21

申请号：US18578107

申请日：2022-03-01

Applicant: EKO INSTRUMENTS CO., LTD.

Inventor： Toshikazu Hasegawa ,  Kees Hoogendijk ,  Mario Po ,  Isamu Chiba

IPC: G01J1/42 ,  G01J1/04 ,  G01J1/16 ,  G01W1/12

Abstract: A sunshine recorder has: a lens that emits, as projection light, natural light incident from half of the celestial sphere; a sensor that photoelectrically converts the projection light projected onto a light receiving surface, and outputs the photoelectrically converted projection light; and a determination circuit that determines the presence or absence of sunshine on the basis of an output of the sensor, wherein the sensor has a plurality of detection areas on the light receiving surface and is configured to output a signal corresponding to the intensity of the projection light incident on each of the detection areas, and the determination circuit removes a scattered light component included in the projection light on the basis of a difference operation of the signal output from each of the detection areas to extract only a direct light component to be included in the projection light at the time of incidence of sunlight.