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公开(公告)号：CA2141038A1
公开(公告)日：1994-02-03
申请号：CA2141038
申请日：1993-07-27
Applicant: PATCHEN CALIFORNIA INC
Abstract: An apparatus and a method are provided for selectively eliminating weeds in agriculture operations. To provide selective elimination, at least two light (radiation) emitters, powered by an internal power source, are modulated to switch on and off at very high speeds. Each emitter emits radiation of a different emitter wavelength. The on/off modulation of one emitter is phase shifted by approximately 90 DEG with respect to the modulation of the other emitter. The pair of emitters are focused on a particular spot on the ground. The light beams, provided by the emitters, are reflected off a plant or the soil and are intercepted by a photodetector. Because plants have a characteristic spectral reflectance in regions of the electromagnetic spectrum which can be discriminated from the spectral reflectance of the background earth, the relative amplitudes of the reflected radiation at the two emitter wavelengths varies depending on whether the radiation is reflected off a plant or the soil. A ratio of the radiation at the two emitter wavelengths received by the photodetector is converted to a phase. This phase is compared to an initial reference phase of the modulation of one of the emitters. A controller uses this phase information to determine the presence or absence of a plant and then eliminates the weed.
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公开(公告)号：AU673186B2
公开(公告)日：1996-10-31
申请号：AU4687793
申请日：1993-07-27
Applicant: PATCHEN CALIFORNIA INC
Abstract: An apparatus and a method are provided for selectively eliminating weeds in agriculture operations. To provide selective elimination, at least two light (radiation) emitters, powered by an internal power source, are modulated to switch on and off at very high speeds. Each emitter emits radiation of a different emitter wavelength. The on/off modulation of one emitter is phase shifted by approximately 90 DEG with respect to the modulation of the other emitter. The pair of emitters are focused on a particular spot on the ground. The light beams, provided by the emitters, are reflected off a plant or the soil and are intercepted by a photodetector. Because plants have a characteristic spectral reflectance in regions of the electromagnetic spectrum which can be discriminated from the spectral reflectance of the background earth, the relative amplitudes of the reflected radiation at the two emitter wavelengths varies depending on whether the radiation is reflected off a plant or the soil. A ratio of the radiation at the two emitter wavelengths received by the photodetector is converted to a phase. This phase is compared to an initial reference phase of the modulation of one of the emitters. A controller uses this phase information to determine the presence or absence of a plant and then eliminates the weed.
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公开(公告)号：NZ254659A
公开(公告)日：1996-09-25
申请号：NZ25465993
申请日：1993-07-27
Applicant: PATCHEN CALIFORNIA INC
IPC: A01M7/00 , A01M21/00 , G01J1/04 , G01J1/42 , G01J1/44 , G01J3/42 , G01J3/50 , G01N21/27 , B05B12/08 , A01M21/04
Abstract: An apparatus and a method are provided for selectively eliminating weeds in agriculture operations. To provide selective elimination, at least two light (radiation) emitters, powered by an internal power source, are modulated to switch on and off at very high speeds. Each emitter emits radiation of a different emitter wavelength. The on/off modulation of one emitter is phase shifted by approximately 90 DEG with respect to the modulation of the other emitter. The pair of emitters are focused on a particular spot on the ground. The light beams, provided by the emitters, are reflected off a plant or the soil and are intercepted by a photodetector. Because plants have a characteristic spectral reflectance in regions of the electromagnetic spectrum which can be discriminated from the spectral reflectance of the background earth, the relative amplitudes of the reflected radiation at the two emitter wavelengths varies depending on whether the radiation is reflected off a plant or the soil. A ratio of the radiation at the two emitter wavelengths received by the photodetector is converted to a phase. This phase is compared to an initial reference phase of the modulation of one of the emitters. A controller uses this phase information to determine the presence or absence of a plant and then eliminates the weed.
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公开(公告)号：DE69322277T3
公开(公告)日：2002-06-27
申请号：DE69322277
申请日：1993-07-27
Applicant: PATCHEN CALIFORNIA INC
Abstract: An apparatus and a method are provided for selectively eliminating weeds in agriculture operations. To provide selective elimination, at least two light (radiation) emitters, powered by an internal power source, are modulated to switch on and off at very high speeds. Each emitter emits radiation of a different emitter wavelength. The on/off modulation of one emitter is phase shifted by approximately 90 DEG with respect to the modulation of the other emitter. The pair of emitters are focused on a particular spot on the ground. The light beams, provided by the emitters, are reflected off a plant or the soil and are intercepted by a photodetector. Because plants have a characteristic spectral reflectance in regions of the electromagnetic spectrum which can be discriminated from the spectral reflectance of the background earth, the relative amplitudes of the reflected radiation at the two emitter wavelengths varies depending on whether the radiation is reflected off a plant or the soil. A ratio of the radiation at the two emitter wavelengths received by the photodetector is converted to a phase. This phase is compared to an initial reference phase of the modulation of one of the emitters. A controller uses this phase information to determine the presence or absence of a plant and then eliminates the weed.
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公开(公告)号：BR9306806A
公开(公告)日：1998-12-08
申请号：BR9306806
申请日：1993-07-27
Applicant: PATCHEN CALIFORNIA INC
Abstract: An apparatus and a method are provided for selectively eliminating weeds in agriculture operations. To provide selective elimination, at least two light (radiation) emitters, powered by an internal power source, are modulated to switch on and off at very high speeds. Each emitter emits radiation of a different emitter wavelength. The on/off modulation of one emitter is phase shifted by approximately 90 DEG with respect to the modulation of the other emitter. The pair of emitters are focused on a particular spot on the ground. The light beams, provided by the emitters, are reflected off a plant or the soil and are intercepted by a photodetector. Because plants have a characteristic spectral reflectance in regions of the electromagnetic spectrum which can be discriminated from the spectral reflectance of the background earth, the relative amplitudes of the reflected radiation at the two emitter wavelengths varies depending on whether the radiation is reflected off a plant or the soil. A ratio of the radiation at the two emitter wavelengths received by the photodetector is converted to a phase. This phase is compared to an initial reference phase of the modulation of one of the emitters. A controller uses this phase information to determine the presence or absence of a plant and then eliminates the weed.
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Patent Agency Ranking
公开(公告)号：PL173490B1
公开(公告)日：1998-03-31
申请号：PL30724693
申请日：1993-07-27
Applicant: PATCHEN CALIFORNIA INC
Abstract: An apparatus and a method are provided for selectively eliminating weeds in agriculture operations. To provide selective elimination, at least two light (radiation) emitters, powered by an internal power source, are modulated to switch on and off at very high speeds. Each emitter emits radiation of a different emitter wavelength. The on/off modulation of one emitter is phase shifted by approximately 90 DEG with respect to the modulation of the other emitter. The pair of emitters are focused on a particular spot on the ground. The light beams, provided by the emitters, are reflected off a plant or the soil and are intercepted by a photodetector. Because plants have a characteristic spectral reflectance in regions of the electromagnetic spectrum which can be discriminated from the spectral reflectance of the background earth, the relative amplitudes of the reflected radiation at the two emitter wavelengths varies depending on whether the radiation is reflected off a plant or the soil. A ratio of the radiation at the two emitter wavelengths received by the photodetector is converted to a phase. This phase is compared to an initial reference phase of the modulation of one of the emitters. A controller uses this phase information to determine the presence or absence of a plant and then eliminates the weed.
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公开(公告)号：DE69322277T2
公开(公告)日：1999-07-08
申请号：DE69322277
申请日：1993-07-27
Applicant: PATCHEN CALIFORNIA INC
Abstract: An apparatus and a method are provided for selectively eliminating weeds in agriculture operations. To provide selective elimination, at least two light (radiation) emitters, powered by an internal power source, are modulated to switch on and off at very high speeds. Each emitter emits radiation of a different emitter wavelength. The on/off modulation of one emitter is phase shifted by approximately 90 DEG with respect to the modulation of the other emitter. The pair of emitters are focused on a particular spot on the ground. The light beams, provided by the emitters, are reflected off a plant or the soil and are intercepted by a photodetector. Because plants have a characteristic spectral reflectance in regions of the electromagnetic spectrum which can be discriminated from the spectral reflectance of the background earth, the relative amplitudes of the reflected radiation at the two emitter wavelengths varies depending on whether the radiation is reflected off a plant or the soil. A ratio of the radiation at the two emitter wavelengths received by the photodetector is converted to a phase. This phase is compared to an initial reference phase of the modulation of one of the emitters. A controller uses this phase information to determine the presence or absence of a plant and then eliminates the weed.
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公开(公告)号：GR3029475T3
公开(公告)日：1999-05-28
申请号：GR990400572
申请日：1999-02-24
Applicant: PATCHEN CALIFORNIA INC
Abstract: An apparatus and a method are provided for selectively eliminating weeds in agriculture operations. To provide selective elimination, at least two light (radiation) emitters, powered by an internal power source, are modulated to switch on and off at very high speeds. Each emitter emits radiation of a different emitter wavelength. The on/off modulation of one emitter is phase shifted by approximately 90 DEG with respect to the modulation of the other emitter. The pair of emitters are focused on a particular spot on the ground. The light beams, provided by the emitters, are reflected off a plant or the soil and are intercepted by a photodetector. Because plants have a characteristic spectral reflectance in regions of the electromagnetic spectrum which can be discriminated from the spectral reflectance of the background earth, the relative amplitudes of the reflected radiation at the two emitter wavelengths varies depending on whether the radiation is reflected off a plant or the soil. A ratio of the radiation at the two emitter wavelengths received by the photodetector is converted to a phase. This phase is compared to an initial reference phase of the modulation of one of the emitters. A controller uses this phase information to determine the presence or absence of a plant and then eliminates the weed.
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公开(公告)号：DE69322277D1
公开(公告)日：1999-01-07
申请号：DE69322277
申请日：1993-07-27
Applicant: PATCHEN CALIFORNIA INC
Abstract: An apparatus and a method are provided for selectively eliminating weeds in agriculture operations. To provide selective elimination, at least two light (radiation) emitters, powered by an internal power source, are modulated to switch on and off at very high speeds. Each emitter emits radiation of a different emitter wavelength. The on/off modulation of one emitter is phase shifted by approximately 90 DEG with respect to the modulation of the other emitter. The pair of emitters are focused on a particular spot on the ground. The light beams, provided by the emitters, are reflected off a plant or the soil and are intercepted by a photodetector. Because plants have a characteristic spectral reflectance in regions of the electromagnetic spectrum which can be discriminated from the spectral reflectance of the background earth, the relative amplitudes of the reflected radiation at the two emitter wavelengths varies depending on whether the radiation is reflected off a plant or the soil. A ratio of the radiation at the two emitter wavelengths received by the photodetector is converted to a phase. This phase is compared to an initial reference phase of the modulation of one of the emitters. A controller uses this phase information to determine the presence or absence of a plant and then eliminates the weed.
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10.发明申请
公开(公告)号：WO1994002812A1
公开(公告)日：1994-02-03
申请号：PCT/US1993006958
申请日：1993-07-27
Applicant: PATCHEN CALIFORNIA, INC.
Inventor： PATCHEN CALIFORNIA, INC. , BECK, Jim , VYSE, Tom
IPC: G01J03/50
CPC classification number: G01J3/50 , A01M7/0089 , A01M21/00 , G01J1/44 , G01J3/0229 , G01J3/42 , G01J3/501 , G01J2001/4242
Abstract: An apparatus and a method are provided for selectively eliminating weeds in agriculture operations. To provide selective elimination, at least two light (radiation) emitters (201, 202), powered by an internal power source, are modulated to switch on and off at very high speeds. Each emitter emits radiation of a different emitter wavelength. The on/off modulation of one emitter is phase shifted by approximately 90 degrees with respect to the modulation of the particular spot on the ground. The light beams (203, 204), provided by the emitters, are reflected off a plant (206) or the soil and are intercepted by a photodetector. Because plants have a characteristic spectral reflectance in regions of the electromagnetic spectrum which can be discriminated from the spectral reflectance of the background earth, the relative amplitudes of the reflected radiation at the two emitter wavelengths varies depending on whether the radiation is reflected off a plant or the soil. A ratio of the radiation at the two emitter wavelengths received by the photodetector is converted to phase. This phase is compared to an initial reference phase of the modulation of one of the emitters. A controller (221) uses this phase information to determine the presence or absence of a plant and then eliminates the weed.
Abstract translation: 提供了一种用于选择性地消除农业操作中的杂草的装置和方法。 为了提供选择性消除，由内部电源供电的至少两个光（辐射）发射器（201,202）被调制以以非常高的速度接通和断开。 每个发射器发射不同发射波长的辐射。 一个发射器的开/关调制相对于地面上的特定光斑的调制相移大约90度。 由发射器提供的光束（203,204）从植物（206）或土壤反射并被光电检测器拦截。 由于植物在电磁波谱区域中具有特征光谱反射率，可以与背景地球的光谱反射率进行区分，所以两个发射波长处的反射辐射的相对幅度取决于辐射是否从植物反射而变化 土壤。 由光电检测器接收的两个发射波长处的辐射比被转换为相位。 将该相位与发射器之一的调制的初始参考相位进行比较。 控制器（221）使用该相位信息来确定植物的存在或不存在，然后消除杂草。
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