[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

WO2014088364A1 - Procédé et appareil permettant de mesurer la quantité d'une chute de neige - Google Patents

Procédé et appareil permettant de mesurer la quantité d'une chute de neige Download PDF

Info

Publication number
WO2014088364A1
WO2014088364A1 PCT/KR2013/011267 KR2013011267W WO2014088364A1 WO 2014088364 A1 WO2014088364 A1 WO 2014088364A1 KR 2013011267 W KR2013011267 W KR 2013011267W WO 2014088364 A1 WO2014088364 A1 WO 2014088364A1
Authority
WO
WIPO (PCT)
Prior art keywords
snow
distance
measuring
measurement
snowfall
Prior art date
Application number
PCT/KR2013/011267
Other languages
English (en)
Korean (ko)
Inventor
김병무
Original Assignee
주식회사 웨더피아
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020130029615A external-priority patent/KR20140073385A/ko
Application filed by 주식회사 웨더피아 filed Critical 주식회사 웨더피아
Publication of WO2014088364A1 publication Critical patent/WO2014088364A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01W—METEOROLOGY
    • G01W1/00—Meteorology
    • G01W1/14—Rainfall or precipitation gauges

Definitions

  • the present invention relates to a method and apparatus for measuring snowfall, and more particularly, to a method and apparatus for more practically and reliably measuring and calibrating the depth (snowfall) of snow accumulated on the ground.
  • Snowfall measurement is one of the interesting areas in the field of automatic measurement because of the importance and necessity of automation, especially when the location of the target point is far from the weather center or residential area.
  • Snowfall measurement equipment based on the currently launched or proposed laser distance measurement technology uses one or two lasers and a receiver connected thereto (for example, Republic of Korea Patent No. 348574). This raises complaints about inconsistent measurement results and vulnerabilities to various environments in the actual measurement site. For example, if a target point of a laser transmitter is obscured or obstructed by foreign matter such as fallen leaves, dust or flying snowflakes, the measurement results may not show the desired information about the snowfall at that point. In addition, measuring only one or two points in an area of 3 feet by 3 feet does not represent the total area.
  • Some models based on image processing use various signal / image processing techniques to recognize the location of several points representing the depth of the eye.
  • One of the problems with these models arises from unclear or blurred images due to snow or ice formed at target points, such as scaled bars, and multiple light sources on a straight line.
  • Another trivial problem is that if it gets too dark, it should be lit properly. (E.g. U.S. Patent Publication No. 2011/0219868)
  • Methods based on mechanical measurements present a potential big problem of mechanical malfunction due to cold weather, strong winds, and ice formation.
  • the measurement result is remarkably changed depending on the type of eye. For example, if the eye is soft, mechanical devices in contact with the eye may press the eye and affect the measurement data.
  • the present invention has been made in view of this point, and provides a snow quantity measuring method and apparatus which is less affected by the surrounding environment while using a single laser range finder and has high reliability.
  • the present invention proposes a method for solving the conventional problems by performing a multi-point measurement of the amount of snow using a single laser range finder combined with a rotating mirror.
  • the rotating mirror is tilted slightly so as to point to different points on a circle (ellipse) generated by laser light projection.
  • This method makes it possible to measure snowfall on a number of points scattered along a circle on the snow surface.
  • the size of the circle (ellipse) can vary depending on the tilt angle and the distance of the mirror from the plane perpendicular to the motor axis that rotates the mirror.
  • the invention also provides a method of calibrating the device of the invention. Boxes or jigs are used that allow the target area to be raised by a predetermined height to allow the calibration procedure to calculate the angle of arrival at each point of the circle on the ground or snow surface.
  • the proposed method calculates the average depth of the area defined by this circle. Abnormal measurements are discarded and averaged only with meaningful measurement data.
  • the snowfall measuring apparatus of the present invention includes a laser range finder, a target point changing means for changing a distance measuring target point of the laser range finder, and a controller for controlling the target point changing means to measure distances from a plurality of target points. .
  • the target point changing means is connected to a step motor including a rotation axis, inclined at a predetermined angle with respect to a plane perpendicular to the rotation axis of the step motor, and comprises a mirror for reflecting a laser beam to and from the laser range finder. Include.
  • the controller measures the distance by controlling the laser range finder while controlling the step motor to rotate the mirror.
  • the controller controls the laser range finder to measure the distance, rotates the step motor by a predetermined rotation angle ⁇ , and then repeats the process of measuring the distance until the mirror rotates one by one, and calculates the amount of snow from the measured distance data.
  • the measurement distance t from the mirror to the surface of the eye at an arbitrary measurement point t is Ls ( t )
  • the distance from the mirror to the ground surface is Lg ( t )
  • the angle where the laser beam meets the surface is ⁇ ( t ).
  • control unit calculates the average snow amount using only the remaining measured value after removing a value that is higher or lower by a certain ratio or more than the average value of the measured snow amount value.
  • the snowfall measuring apparatus of the present invention may further include communication means for transmitting the measured distance value to the external device.
  • the snowfall measuring device of the present invention can be housed in a protective cover for protecting the device.
  • the protective cover is fitted with glass in front of the mirror of the snow level measuring device.
  • the snowfall measurement method of the present invention is a snowfall measurement method using a snowfall measurement device that measures snowfall on a plurality of points scattered along a circle or ellipse on an eye surface, the distance from the measuring device to a plurality of points on the circle or ellipse. Sequentially measuring and calculating snowfall from the measured plurality of distance values.
  • the measurement distance from the measuring device to the surface of the eye at an arbitrary measuring point t is Ls ( t ), the distance from the measuring device to the ground surface is Lg ( t ), and the angle where the laser beam meets the ground surface is ⁇ ( t ).
  • the average snow amount it is preferable to calculate the average snow amount using only the snow amount remaining after removing the snow amount value by a certain ratio or more than the average value of the snow quantity values at the plurality of points measured.
  • the rotating mirror for reflecting the laser beam is slightly inclined, snow quantity measurement on a plurality of points scattered along a circle on the eye surface is possible. It is also possible to detect erroneous measurement data over time and isolate the affected point (s) until the erroneous action is corrected. Also, because more samples can be obtained for the oval on the eye surface, the average snowfall measured may be closer to the actual snowfall value compared to other methods based on one or less samples.
  • the size of the target area can be more easily changed by relocating the equipment or changing the tilt angle of the mirror.
  • only one low-cost device including a laser range finder, a stepper motor and a mirror can be used, which can be made in a relatively smaller housing with higher cost efficiency and lower complexity.
  • FIG. 1 is a conceptual diagram showing the configuration of the snow amount measuring apparatus of the present invention.
  • FIG. 2 is an explanatory diagram for explaining a laser beam reflection operation of the snowfall measuring apparatus of the present invention.
  • FIG. 3 is a view for explaining the snowfall measurement principle of the snowfall measuring apparatus of the present invention.
  • FIG. 4 is a view for explaining the operation of the snow amount measurement device of the present invention to measure the snow amount along the circle on the eye surface.
  • 5 is an example of a measurement data graph having protrusion values and depression values.
  • FIG. 8 is a view for explaining a method of performing the calibration of the present invention using a jig having a height Lref.
  • FIG. 9 is a flowchart illustrating a calibration process according to an embodiment of the present invention.
  • FIG. 10 shows an embodiment using an enclosure and glass to protect from wind and dust.
  • depth of the eye means the height of the eye from the ground surface
  • circles and “ellipses” refer to the pattern formed on the eye surface by laser reflected light reflected by the tilt mirror. It is used interchangeably.
  • the amount of movement by the stepper motor in degrees is expressed by the measurement point (or measurement point) "t” or the rotation angle " ⁇ ".
  • the snowfall measurement system includes four components: a laser range finder module 10 and a mirror 11 tilted from a plane perpendicular to the axis of the step motor. ), A step motor 12 connected to the mirror, and a processing module or computer module 13 as a control unit.
  • the laser beam reflected by the mirror 11 which is tilted and rotated by the step motor 12 is projected onto the plane 22 formed by the stacked eyes to form an ellipse (or circle) 21.
  • the laser range finder module 10 under the control of the processing module 13 emits a laser signal and receives a signal reflected through the mirror 11 from the eye.
  • the processing module 13 determines the distance from the received signal from the reference point to the point on the eye surface to which the mirror 11 points and records the data.
  • the processing module 13 outputs a control signal for rotating the stepper motor 12 by a predetermined rotation angle ⁇ , and performs laser signal firing, reception, and depth measurement processes for the next position. By repeating this process, an elliptic scan is projected onto the eye.
  • the mirror 11 is connected to the step motor 12 via the shaft 14 in a state inclined by an angle ⁇ with respect to the plane 15 perpendicular to the shaft 14.
  • the motor 12 rotates, the inclination angle of the mirror 11 is changed, and thus the direction of light reflected from the mirror 11 is also changed.
  • the eye depth d ( t ) at time t can be obtained by the following equation.
  • ⁇ ( t ) is the angle at which the laser beam meets the ground surface at time t .
  • the processing module 13 repeats the above steps for the next point on the circle 21.
  • the processing module 13 may store all the measurement data in a local storage or transmit it to an external server through a communication channel for further analysis.
  • the processing module 13 or the external server analyzes the data by averaging the measured raw data. At this time, it is desirable to remove the abnormally high or low value from the measurement data compared to the reference value.
  • the reference value may be taken as the final average value of the snow quantity measured during the last one rotation (or more) (an average value obtained by removing the protrusion value and the depression value). Therefore, the reference value is updated at every measurement of the rotation.
  • Exemplary graphs measured for 24 points along a circle are shown in FIG. 5.
  • the spikes 51 and 52 and the recessed dip 53 are removed.
  • Meaningful data can be obtained by removing significant abnormalities and then averaging the remaining values.
  • the measurement data at a certain point is steadily abnormally high or low, this abnormality may have been caused by obstacles, interference by foreign matter or impurities on the glass cover.
  • the protrusion value 61 shows a consistent abnormality while the depression 62 and the protrusion value 63 are temporary. This may be caused by moving fallen leaves or flying snow.
  • the measurement system may report an event to an external server or generate an alarm signal.
  • a box or table-like jig as shown in FIG. 7 is used to provide a predetermined eye depth (height) Lref.
  • FIG. 8 is a diagram illustrating a calibration method of the present invention for a specific time t
  • FIG. 9 is a flowchart illustrating an example of a calibration procedure.
  • Lg ( t ) be the distance from time t to the ground and Lr ( t ) be the distance to the jig surface.
  • Lg ( t ) and Lr ( t ) are the distance measured from the laser rangefinder minus the distance (Lm) from the laser rangefinder to the mirror.
  • the calculated sin ⁇ ( t ) and the measured Lg ( t ) are used to calculate snowfall d ( t ) using the measured Ls ( t ) to calculate the actual snowfall.
  • the point used in the calibration is one point higher than the ground (Lref), which is higher than the ground, and the closer the higher point is to the laser measuring device, the higher the parallelism with the ground.
  • the measurement error is reduced and convenient to implement.
  • Figure 10 shows the protective cover 100 and glass 101 surrounding the measuring device of the present invention.
  • the entire assembly can be secured to a pole or structure to prevent the device from shaking or moving when the wind is blowing.
  • the processing module 13 may be connected to the communication module and configured to communicate with an external server for further processing of data.
  • the shape of the circle in the present invention is not critical and may be a complete circle or an ellipse depending on where the device is installed and the angle at which the laser signal is projected.
  • the use of non-flat mirrors can measure for any pattern projected on the eye surface.
  • the present invention is not necessarily limited to these embodiments, although all components constituting the embodiments of the present invention have been described as being combined or operating in combination. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more. In addition, although all of the components may be implemented in one independent hardware, each or all of the components may be selectively combined to perform some or all functions combined in one or a plurality of hardware. It may be implemented as a computer program having a. Codes and code segments constituting the computer program may be easily inferred by those skilled in the art. Such a computer program may be stored in a computer readable storage medium and read and executed by a computer, thereby implementing embodiments of the present invention.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Atmospheric Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental Sciences (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

La présente invention concerne un procédé permettant de mesurer la quantité d'une chute de neige et un appareil servant à mesurer la quantité d'une chute de neige au moyen d'un seul dispositif laser de mesure de distance. L'appareil de l'invention comprend : un dispositif laser de mesure de distance ; un moteur pas-à-pas comprenant un arbre rotatif ; un miroir fixé sur l'arbre rotatif du moteur pas-à-pas, de telle manière que le miroir est incliné selon un angle prédéterminé par rapport au plan vertical à l'arbre rotatif, de façon à réfléchir un faisceau laser provenant et allant vers le dispositif laser de mesure de distance ; et une unité de commande servant à commander le dispositif laser de mesure de distance, tout en faisant tourner le miroir en commandant le moteur pas-à-pas afin de mesurer une distance. Selon la présente invention, le miroir servant à réfléchir le faisceau laser tourne en étant légèrement incliné et, par conséquent, ceci permet de mesurer la quantité d'une chute de neige au niveau de multiples points dispersés le long du cercle sur la surface de la neige.
PCT/KR2013/011267 2012-12-06 2013-12-06 Procédé et appareil permettant de mesurer la quantité d'une chute de neige WO2014088364A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201261734353P 2012-12-06 2012-12-06
US61/734,353 2012-12-06
KR10-2013-0029615 2013-03-20
KR1020130029615A KR20140073385A (ko) 2012-12-06 2013-03-20 적설량 측정 방법 및 장치

Publications (1)

Publication Number Publication Date
WO2014088364A1 true WO2014088364A1 (fr) 2014-06-12

Family

ID=50883714

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2013/011267 WO2014088364A1 (fr) 2012-12-06 2013-12-06 Procédé et appareil permettant de mesurer la quantité d'une chute de neige

Country Status (1)

Country Link
WO (1) WO2014088364A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110361067A (zh) * 2019-07-12 2019-10-22 彩虹（合肥）液晶玻璃有限公司 一种液面高度测量装置
CN111024185A (zh) * 2019-12-17 2020-04-17 南京浦和数据有限公司 一种城市道路积水监测装置和方法
CN112307038A (zh) * 2019-10-15 2021-02-02 邓继红 数据信息实时更新装置以及相应终端
CN113460897A (zh) * 2021-07-30 2021-10-01 盛景智能科技(嘉兴)有限公司 配重确定方法、装置、设备及作业机械
WO2022156339A1 (fr) * 2021-01-22 2022-07-28 华为技术有限公司 Procédé et appareil de détermination d'informations d'accumulation de route

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000131460A (ja) * 1998-10-28 2000-05-12 Yokogawa Electric Corp 積雪深計
KR100348574B1 (ko) * 1998-06-18 2003-06-12 정찬권 적설량측정장치및그방법
KR20090067834A (ko) * 2007-12-21 2009-06-25 재단법인 포항산업과학연구원 광학식 적설 계측 시스템 및 그 방법
KR20110048177A (ko) * 2009-11-02 2011-05-11 현종훈 적설량 측정 시스템 및 그 방법
KR20120129517A (ko) * 2011-05-20 2012-11-28 안성윤 3차원 거리 측정기

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100348574B1 (ko) * 1998-06-18 2003-06-12 정찬권 적설량측정장치및그방법
JP2000131460A (ja) * 1998-10-28 2000-05-12 Yokogawa Electric Corp 積雪深計
KR20090067834A (ko) * 2007-12-21 2009-06-25 재단법인 포항산업과학연구원 광학식 적설 계측 시스템 및 그 방법
KR20110048177A (ko) * 2009-11-02 2011-05-11 현종훈 적설량 측정 시스템 및 그 방법
KR20120129517A (ko) * 2011-05-20 2012-11-28 안성윤 3차원 거리 측정기

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110361067A (zh) * 2019-07-12 2019-10-22 彩虹（合肥）液晶玻璃有限公司 一种液面高度测量装置
CN110361067B (zh) * 2019-07-12 2021-01-01 彩虹（合肥）液晶玻璃有限公司 一种液面高度测量装置
CN112307038A (zh) * 2019-10-15 2021-02-02 邓继红 数据信息实时更新装置以及相应终端
CN111024185A (zh) * 2019-12-17 2020-04-17 南京浦和数据有限公司 一种城市道路积水监测装置和方法
CN111024185B (zh) * 2019-12-17 2021-07-16 南京浦和数据有限公司 一种城市道路积水监测装置和方法
WO2022156339A1 (fr) * 2021-01-22 2022-07-28 华为技术有限公司 Procédé et appareil de détermination d'informations d'accumulation de route
CN113460897A (zh) * 2021-07-30 2021-10-01 盛景智能科技(嘉兴)有限公司 配重确定方法、装置、设备及作业机械
CN113460897B (zh) * 2021-07-30 2024-10-11 盛景智能科技(嘉兴)有限公司 配重确定方法、装置、设备及作业机械

Similar Documents

Publication Publication Date Title
WO2014088364A1 (fr) Procédé et appareil permettant de mesurer la quantité d'une chute de neige
CA2977832C (fr) Systeme lidar modulaire
JP5552060B2 (ja) データセンタのラック内に設置されたコンピューティング機器への位置情報の提供
CN110573928B (zh) 光检测和测距系统中的角校准
KR20180063263A (ko) 3차원 공간 검출 시스템, 측위 방법 및 시스템
CN110225534B (zh) 路侧单元测试方法、装置、设备、系统及可读存储介质
CN109343037B (zh) 光探测器安装误差检测装置、方法和终端设备
WO2020139195A1 (fr) Drone destiné à une inspection de défauts de surface
US10732284B2 (en) Live metrology of an object during manufacturing or other operations
KR20200121756A (ko) 모바일 로봇의 초기화 진단 방법 및 시스템
CN111025032A (zh) 一种基于升空平台的天线波束测量系统及方法
CN116413702A (zh) 激光雷达位姿的诊断方法、激光雷达及自动驾驶车辆
WO2015141935A1 (fr) Dispositif de mesure de chute de neige numérique
KR101453336B1 (ko) 비접촉 변위측정시스템
CN106019531A (zh) 相位测距摄像模组及其自动报警方法
CN113586356B (zh) 风力发电机组的净空监测系统和方法
CN110864920B (zh) 一种基于视觉的角度关系自动测定方法及其系统
CN110166653B (zh) 摄像机位置和姿态的跟踪系统及方法
JP2005534033A (ja) 光学的距離および角度の測定方法およびシステム
WO2017188476A1 (fr) Dispositif et procédé de mesure d'accumulation de neige
EP3971605A1 (fr) Chambre anéchoïque améliorée
CN112000082B (zh) 一种无人航空器感知规避能力检测评估系统及方法
KR20140073385A (ko) 적설량 측정 방법 및 장치
KR20060024098A (ko) 사면부의 거동량을 측정하기 위한 사면거동 측정시스템 및이를 이용한 사면거동량 측정방법
JP2018054504A (ja) 位置推定システム、及び位置推定方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13860588

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 23/11/2015)

122 Ep: pct application non-entry in european phase

Ref document number: 13860588

Country of ref document: EP

Kind code of ref document: A1