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公开(公告)号：US10598591B2
公开(公告)日：2020-03-24
申请号：US16074285
申请日：2017-05-11
Inventor： Takeshi Fujiyama , Yuuji Terashima , Hisahiro Tanaka
IPC: G01N21/00 , G01N21/3554 , A01G7/04 , G01N21/27 , G01N21/359 , G06T7/00 , A01G27/00 , A01G7/00 , G01N21/3563 , G01N21/84
Abstract: A true leaf and a plurality of artificial leaves are attached on a white reference substrate. A first light source radiates a reference beam of 905 nm while sequentially scanning toward the white reference substrate. A second light source radiates a measuring beam of 1550 nm while sequentially scanning toward the white reference substrate. A threshold level setter/water content index detector calculates a relative water content of a true leaf based on the intensity of each reflection light of the reference beam and the measuring beam which are respectively reflected by the true leaf and a plurality of artificial leaves.
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Patent Agency Ranking
公开(公告)号：US10267730B2
公开(公告)日：2019-04-23
申请号：US16155357
申请日：2018-10-09
Inventor： Takeshi Fujiyama , Yuuji Terashima
IPC: G01N21/31 , G01N21/47 , G01N21/84 , G01N21/359 , G01N21/3554
Abstract: A water content evaluation apparatus which evaluates water content of a part of a plant is provided. A water content at each of irradiation positions of the part of the plant is calculated based on a first reflection light of a laser reference beam, having a first wavelength that is not absorbed by water, that is reflected at all the irradiation positions of the plant and a second reflection light of a laser measuring beam, having a second wavelength that is absorbed by water, that is reflected at all the irradiation positions of the plant. Irradiation positions of the plant in which the water content is equal to or larger than at least one predetermined threshold level are displayed, in at least one corresponding predetermined color.
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公开(公告)号：US10309896B2
公开(公告)日：2019-06-04
申请号：US15525431
申请日：2016-03-02
Inventor： Takeshi Fujiyama , Yuuji Terashima , Kazuhiro Yanagi
IPC: G01N21/00 , G01N21/359 , A01G7/04 , A01H3/02 , A01H1/04 , G01N21/3554 , G01N21/31
Abstract: There is provided a plant stress detection apparatus including a first light source that radiates a reference beam of a first wavelength that has a characteristic of tending not to be absorbed in water toward a plant by optical scanning, a second light source that radiates a measuring beam of a second wavelength that has a characteristic of tending to be absorbed in water toward the plant by optical scanning, and a detector that detects presence or absence of water or undulation of the plant based on reflection light of the reference beam that is reflected at an irradiation position of the plant that has a first irradiation area and reflection light of the measuring beam that is reflected at an irradiation position of the plant that has a second irradiation area that is different from the first irradiation area.
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4.发明授权公开(公告)号：US11002670B2
公开(公告)日：2021-05-11
申请号：US15779759
申请日：2016-10-21
Inventor： Takeshi Fujiyama , Yuuji Terashima
IPC: G01N21/3554 , A01G25/16 , G01N21/3563 , G01N21/359 , G01N21/47 , G01N21/84
Abstract: A first beam source radiates, as a reference beam, 905 nm of near infrared beam having a characteristic in which light tends not to be absorbed in water toward a leaf of a plant. A second beam source radiates, as a measuring beam, 1550 nm of near infrared beam having a characteristic in which light tends to be absorbed in water toward the leaf of the plant. A threshold level setter/water content index detector calculates a water content index of one leaf which is a total sum Σ Ln (I905/I1550) of the reflection intensity ratio. A controller displays a graph representing the time-serial change of the water content contained in the plant from the start to the end of the measurement period on a UI screen of a monitor. Further, the controller is connected to an environmental control device that controls environmental conditions surrounding the plant, and instructs the control device to change or maintain the environmental conditions based on a change of increase and decrease in the water content contained in the calculated plant.
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5.发明授权公开(公告)号：US10768102B2
公开(公告)日：2020-09-08
申请号：US16065892
申请日：2017-02-20
Inventor： Takeshi Fujiyama , Yuuji Terashima
IPC: G01N21/3554 , A01G7/00 , A01G27/00 , G01N33/00 , G01N21/359 , G01N21/31 , G01N21/84 , G01N21/27
Abstract: A threshold level setter/water content index detector calculates an Σ Ln (I905/I1550) which is a total sum of the reflection intensity ratio as a water content index of one leaf. A controller displays a graph representing the time-transition of the water content contained in the leaf of the plant from the start to the end of the measurement period on a UI screen of monitor 50. The controller fixedly determines and sets, as a leaf, a set of reflection positions where the water content for each reflection position which is calculated at the start of the measurement period exceeds a threshold level. When viewed from first beam source and second beam source, white reference substrate which covers a back surface of the leaf of the plant is disposed on the leaf of the plant.
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公开(公告)号：US10126234B2
公开(公告)日：2018-11-13
申请号：US15295065
申请日：2016-10-17
Inventor： Takeshi Fujiyama , Yuuji Terashima
IPC: G01N21/84 , G01N21/3554 , G01N21/359 , G01N21/31 , G01N21/47
Abstract: In a water content evaluation method, when water content of a part of a plant is evaluated, a white reference substrate (background material) is disposed so as to cover a back surface of a leaf of plant. A first beam source radiates a near infrared beam (reference beam) with a wavelength of 905 nm that has a characteristic of tending not to be absorbed in water toward leaf. A second beam source radiates a near infrared beam (measuring beam) with a wavelength of 1550 nm that has a characteristic of tending to be absorbed in water toward the leaf. Threshold level setter/water content index detector calculates a water content index of one leaf that is total sum Σ Ln (I905/I1550) of the reflection intensity rate at all irradiation positions of the leaf based on a reflection light of a reference beam and a reflection light of a measuring beam that are reflected on all irradiation positions of the leaf.
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