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1. 发明授权

US11262103B1 Heliostat localization in camera field-of-view with induced motion 有权
公开(公告)号：US11262103B1
公开(公告)日：2022-03-01
申请号：US16457597
申请日：2019-06-28
申请人： Alexander Sonn , William Gross
发明人： Alexander Sonn , William Gross
IPC分类号： G02B5/08 , F24S40/90 , G06T7/70 , G06T7/80 , F24S20/20 , F24S50/20 , F24S50/80 , G01J1/42 , F24S20/00
摘要： A system and method for localization and calibration of a heliostat is disclosed. The system comprises a controller and a camera configured to acquire images of a plurality of heliostats. The controller and camera are configured to acquire a first image of the plurality of heliostats, move one of the plurality of heliostats, acquire a second image of the plurality of heliostats, generate a difference image by subtracting the second image from the first image, identify the heliostat that was moved based on the difference image, and calibrate the position or orientation of the heliostat based on the difference image. The difference image is generated by pixel-wise subtraction of the second image from the first image. The pixel-wise subtraction exposes the heliostat and enables the calibration of the position and/or orientation of known heliostat positions.

2. 发明申请

US20220079790A1 HELIOSTAT TRACKING BASED ON CIRCUMSOLAR RADIANCE MAPS 有权
公开(公告)号：US20220079790A1
公开(公告)日：2022-03-17
申请号：US17329959
申请日：2021-05-25
申请人： Alexander Sonn
发明人： Alexander Sonn
IPC分类号： A61F2/97 , A61F2/95
摘要： A system and method for tracking the sun with a heliostat mirror is disclosed. The solar tracking system comprises: a camera configured to capture high dynamic range images of the sky, a plurality of cameras configured to capture images of the heliostat mirror, and a tracking controller. The images of the heliostat mirror include reflections of the sky. The tracking controller is configured to generate a circumsolar radiance map characterizing the brightness of at least a portion of the sky with the high dynamic range images. During tracking operations, the tracking controller is configured to estimate an orientation of the heliostat mirror; calculate coordinates of the portions of sky in the reflections in the heliostat mirror; estimate brightness levels of portions of sky in the reflections of the heliostat mirror based on the calculated coordinates and the radiance model; determine brightness levels of portions of sky in the reflections of the heliostat mirror based on the images from the plurality of cameras; generate an error measurement characterizing a difference between the brightness level estimated from the radiance model and the brightness level determined from the images of the heliostat mirror; search for an orientation angle of the at least one mirror that minimizes the error measurement; and re-orient the at least one mirror based on the orientation angle that minimizes the error measurement.

3. 发明授权

US11017561B1 Heliostat tracking based on circumsolar radiance maps 有权
公开(公告)号：US11017561B1
公开(公告)日：2021-05-25
申请号：US16594937
申请日：2019-10-07
申请人： Alexander Sonn
发明人： Alexander Sonn
IPC分类号： G06T7/73 , G06K9/46 , H04N5/247
摘要： A system and method for tracking the sun with a heliostat mirror is disclosed. The solar tracking system comprises: a camera configured to capture high dynamic range images of the sky, a plurality of cameras configured to capture images of the heliostat mirror, and a tracking controller. The images of the heliostat mirror include reflections of the sky. The tracking controller is configured to generate a circumsolar radiance map characterizing the brightness of at least a portion of the sky with the high dynamic range images. During tracking operations, the tracking controller is configured to estimate an orientation of the heliostat mirror; calculate coordinates of the portions of sky in the reflections in the heliostat mirror; estimate brightness levels of portions of sky in the reflections of the heliostat mirror based on the calculated coordinates and the radiance model; determine brightness levels of portions of sky in the reflections of the heliostat mirror based on the images from the plurality of cameras; generate an error measurement characterizing a difference between the brightness level estimated from the radiance model and the brightness level determined from the images of the heliostat mirror; search for an orientation angle of the at least one mirror that minimizes the error measurement; and re-orient the at least one mirror based on the orientation angle that minimizes the error measurement.

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