公开(公告)号：EP0653051A4

公开(公告)日：1995-12-27

申请号：EP93917331

申请日：1993-07-27

Applicant: PATCHEN CALIFORNIA INC

Inventor： BECK JIM ,  VYSE TOM

IPC: A01M7/00 ,  A01M21/00 ,  G01J1/04 ,  G01J1/42 ,  G01J1/44 ,  G01J3/42 ,  G01J3/50 ,  G01N21/27

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.

公开(公告)号：EP0653051A1

公开(公告)日：1995-05-17

申请号：EP93917331.0

申请日：1993-07-27

Applicant: PATCHEN CALIFORNIA, INC.

Inventor： BECK, Jim ,  VYSE, Tom

IPC: A01M7 ,  A01M21 ,  G01J1 ,  G01J3 ,  G01N21

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: 提供了一种装置和方法，用于选择性地消除农业作业中的杂草。 为了提供选择性消除，至少两个由内部电源供电的光（辐射）发射器（201,202）被调制成以非常高的速度开启和关闭。 每个发射器发射不同发射器波长的辐射。 一个发射器的开/关调制相对于地面上特定点的调制相移约90度。 由发射器提供的光束（203,204）被植物（206）或土壤反射并被光电探测器拦截。 由于植物在可以与背景地球的光谱反射率区分的电磁波谱区域中具有特征光谱反射率，所以在两个发射器波长处的反射辐射的相对振幅取决于辐射是否从植物反射或 土壤。 由光电探测器接收的两个发射器波长的辐射比率被转换成相位。 该阶段与其中一个发射器的调制的初始参考阶段进行比较。 控制器（221）使用该阶段信息来确定植物的存在或不存在，然后消除杂草。