公开(公告)号：US20200018699A1

公开(公告)日：2020-01-16

申请号：US16503862

申请日：2019-07-05

申请人： Yuya KAWASAKI ,  Hideo Kurosawa

发明人： Yuya KAWASAKI ,  Hideo Kurosawa

IPC分类号： G01N21/41 ,  G01N27/22

摘要： A droplet sensor includes an optical cover that forms part of a spheroid, a major axis of the spheroid being a vertical axis, a light emitting/receiving device disposed at a position offset from a first focal point of the spheroid along the major axis, and a reflector disposed in vicinity of a second focal point of the spheroid. The optical cover has an effective detection area between the light emitting/receiving device and the reflector. The effective detection area satisfies a total internal reflection condition at an interface with a gas, and does not satisfy the total internal reflection condition at an interface with a liquid. The reflector reflects, towards a light receiving surface of the light emitting/receiving device, light totally reflected by the effective detection area, or reflects, towards the effective detection area, light directly incident on the reflector from the light emitting/receiving device.

公开(公告)号：US11525776B2

公开(公告)日：2022-12-13

申请号：US16503862

申请日：2019-07-05

申请人： Yuya Kawasaki ,  Hideo Kurosawa

发明人： Yuya Kawasaki ,  Hideo Kurosawa

IPC分类号： G01N21/41 ,  G01N27/22 ,  B60S1/08 ,  G01W1/14 ,  G01N21/55 ,  G01N21/43

摘要： A droplet sensor includes an optical cover that forms part of a spheroid, a major axis of the spheroid being a vertical axis, a light emitting/receiving device disposed at a position offset from a first focal point of the spheroid along the major axis, and a reflector disposed in vicinity of a second focal point of the spheroid. The optical cover has an effective detection area between the light emitting/receiving device and the reflector. The effective detection area satisfies a total internal reflection condition at an interface with a gas, and does not satisfy the total internal reflection condition at an interface with a liquid. The reflector reflects, towards a light receiving surface of the light emitting/receiving device, light totally reflected by the effective detection area, or reflects, towards the effective detection area, light directly incident on the reflector from the light emitting/receiving device.

公开(公告)号：US10955339B2

公开(公告)日：2021-03-23

申请号：US16801624

申请日：2020-02-26

申请人： Yuya Kawasaki ,  Hideo Kurosawa

发明人： Yuya Kawasaki ,  Hideo Kurosawa

IPC分类号： G01N21/552 ,  G01J3/42 ,  G01J3/02

摘要： A droplet sensor includes an optical cover having an elliptical surface forming a portion of a spheroid, a light source arranged at or in a vicinity of a first focal point of the elliptical surface, and a photodetector arranged at or in a vicinity of a second focal point of the elliptical surface. The elliptical surface includes an effective detection area configured to reflect light emitted from the light source towards the photodetector. An amount of light reflected from the effective detection area changes according to adhesion of a droplet on the effective detection area of the elliptical surface. The optical cover includes a hollow portion that is provided in a region inside the optical cover, and outside optical paths of the light emitted from the light source and reflected from the effective detection area toward the photodetector.

公开(公告)号：US11486827B2

公开(公告)日：2022-11-01

申请号：US17029457

申请日：2020-09-23

申请人： Hideo Kurosawa

发明人： Hideo Kurosawa

IPC分类号： G01N21/552 ,  B60S1/08

摘要： A droplet sensor includes an optical cover having an ellipsoid surface that is a portion of a spheroid, a light source disposed at or in proximity to a first focal point of the ellipsoid surface, and a light detector disposed at or in proximity to a second focal point of the ellipsoid surface. The ellipsoid surface includes an effective detection area configured to reflect light emitted by the light source toward the light detector, and an amount of light reflected by the effective detection area changes in accordance with adhesion of droplets on the ellipsoid surface. The optical cover includes a space having a hemispherical surface, the space being centered at the second focal point. The hemispherical surface includes a transmission scattering surface on a region that receives the light reflected by the effective detection area.

公开(公告)号：US11598721B2

公开(公告)日：2023-03-07

申请号：US17029489

申请日：2020-09-23

申请人： Hideo Kurosawa

发明人： Hideo Kurosawa

IPC分类号： G01N21/552 ,  G01N21/41 ,  G02B19/00

摘要： A droplet sensor includes: an optical cover having an ellipsoid surface that is a portion of a spheroid; a light source disposed at or in proximity to a first focal point of the ellipsoid surface; and a light detector disposed at or in proximity to a second focal point of the ellipsoid surface, wherein the ellipsoid surface is an effective detection area configured to reflect light emitted from the light source toward the light detector, and an amount of light reflected by the effective detection area changes in accordance with adhesion of droplets on the ellipsoid surface, and wherein the optical cover has a curved surface that is tangentially connected to an outside of the effective detection area and having a curvature greater than a curvature of the ellipsoid surface.