CN113447005B - Portable field area demarcation aid and demarcation method thereof - Google Patents

Portable field area demarcation aid and demarcation method thereof Download PDF

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Publication number
CN113447005B
CN113447005B CN202110732203.XA CN202110732203A CN113447005B CN 113447005 B CN113447005 B CN 113447005B CN 202110732203 A CN202110732203 A CN 202110732203A CN 113447005 B CN113447005 B CN 113447005B
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China
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laser
demarcation
rotating part
auxiliary device
aid
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CN113447005A (en
Inventor
侯文峰
冯建骋
许伟韬
高强
李翠兰
王寅
冯国忠
王少杰
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Jilin Agricultural University
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Jilin Agricultural University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C15/00Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical techniques
    • G01B11/02Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00Measuring arrangements characterised by the use of mechanical techniques

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The utility model discloses a portable field area demarcation aid and a demarcation method thereof, which relate to the technical field of test field area demarcation equipment, and comprise a fixed part and a rotating part, wherein one end of the fixed part is used for being inserted into soil, the other end of the fixed part is rotationally connected with the rotating part, and the connecting ends of the fixed part and the rotating part which are mutually connected are respectively provided with a scale mark and a pointer for measuring the rotation angle of the rotating part; the rotating part is fixedly provided with a laser emitter for emitting light rays along the horizontal radial direction; according to the utility model, the visible laser rays emitted by the laser emitter are used as the boundary of the demarcation region, and the characteristics that the laser paths are straighter and cannot generate angle deviation are utilized, so that the technical problems of time and labor waste and easy deviation caused by adopting a manual pull rope can be avoided; simultaneously, the rotating part and the fixing part with the pointer and the scale marks are arranged, so that the angle between the laser rays emitted by the laser transmitters on the adjacent auxiliary devices can be accurately mastered, and the method is simpler.

Description

Portable field area demarcation aid and demarcation method thereof
Technical Field
The utility model relates to the technical field of test field area demarcation equipment, in particular to a portable field area demarcation aid and a demarcation method thereof.
Background
The test field is used as a farmland for agricultural technicians to carry out items such as variety comparison, fertilizer comparison, season comparison, pest control comparison and the like. In traditional field test, often adopt many people's guy rope when demarcating test field piece, measure the mode with the tape measure and go on, waste time and energy, and artifical guy rope very easily appears the deviation, causes demarcation regional boundary to appear the slope dislocation, and two boundary angles can not reach the settlement requirement to not only influenced demarcation regional area, caused experimental inaccuracy, also led to the district shape irregular, influence experimental demonstration effect.
The demarcation tool disclosed in the patent application number is 201821209607.0, namely the demarcation tool for a field test plot can accurately and quickly determine the right angle of a test plot, the test plot is divided according to the terrain and the test requirement (plot area), the test condition is repeatable and beneficial to the construction of the field test plot, but the demarcation tool needs to draw lines repeatedly in the use process, the length of a line segment is measured, the position of a recording point is recorded, and two lines forming the right angle are determined, so that although the accuracy of the right angle can be ensured, the demarcation mode is very complicated. The utility model patent with the application number of 201821608472.5 and the name of a simple field right angle measuring instrument discloses a right angle measuring instrument, when a line perpendicular to a ridge is required to be defined in a field, the bottom of a square tube is fixed in the field, the distances between a fixed point and the vertical line and between the fixed point and the ridge are 2-4 cm, a vertical arm of a second right angle code is adjusted, a hanging wire hammer on a transverse arm of the second right angle code is positioned right above the central line of the ridge, at the moment, the ground right below the hanging wire hammer of the vertical arm is marked, and the connecting line between the marks is the vertical line; in the actual use process, although the vertical line with the ridge can be obtained quickly, the manual rope is still needed in the process of actually demarcating the regional line, so that the conditions of time and labor waste and easy deviation of the boundary included angle still exist.
Therefore, how to quickly and accurately determine the boundary of a field demarcation region, improve the demarcation efficiency and reduce the labor intensity is a technical problem which needs to be solved in the field.
Disclosure of Invention
The utility model aims to provide a portable field area demarcation aid and a demarcation method thereof, which are used for solving the problems in the prior art, obviously improving the field area demarcation efficiency and accuracy and reducing the labor intensity of personnel.
In order to achieve the above object, the present utility model provides the following solutions: the utility model provides a portable field area demarcation aid which comprises a fixed part and a rotating part, wherein one end of the fixed part is used for being inserted into soil, the other end of the fixed part is rotationally connected with the rotating part, and the connecting ends of the fixed part and the rotating part are respectively provided with a scale mark and a pointer for measuring the rotation angle of the rotating part; and the rotating part is fixedly provided with a laser emitter for emitting light rays along the horizontal radial direction.
Preferably, the rotating part is further provided with a laser receiver for receiving horizontal laser, and the emitting hole of the laser transmitter is the same as the setting height of the photosensitive hole of the laser receiver.
Preferably, be provided with the display screen on the rotation portion lateral wall, inside is provided with laser rangefinder module, laser rangefinder module the display screen the laser receiver all carries out the electricity and connects, the display screen can show laser emission distance.
Preferably, a power supply for supplying power to the electrical element on the rotating portion is further provided in the fixed portion.
Preferably, the top of the rotating part is also connected with a top cover for sealing the rotating part through threads.
Preferably, the top surface of the top cover is provided with a level bubble for detecting whether the fixing part is vertical.
Preferably, the fixed part and the rotating part are both provided with a level meter.
Preferably, one end of the fixing portion for being inserted into soil is tapered.
The utility model also provides a portable field area demarcation method, which comprises the following steps:
1) Inserting a fixing part into the soil at a set position, ensuring the fixing part to be vertical through a level gauge and a level bubble, taking the auxiliary device as a vertex of a demarcation area, wherein the direction opposite to the laser emitter is the extending direction of one side of the demarcation area;
2) Rotating the rotating part by a set angle, turning on a power switch, enabling the laser transmitter to emit laser, inserting an auxiliary device in the laser direction, enabling a photosensitive hole of the laser receiver to be aligned with the laser for receiving, displaying the distance between the two auxiliary devices on a display screen, and adjusting the position of the latter auxiliary device according to the required distance to obtain the other vertex of the delimited area;
3) Repeating the step 2), inserting a plurality of auxiliary devices to obtain all vertexes of the delimited area;
4) Crop plants are planted in the delimited areas.
Preferably, an auxiliary device is arranged between the two auxiliary devices in the delimited area, the distance between the auxiliary device and the end auxiliary device is adjusted to a set distance, then the rotating part on the auxiliary device is rotated by a set angle, the power switch is turned on, the laser transmitter transmits laser, and a ridge or a crop is manufactured along the laser light path.
Compared with the prior art, the utility model has the following technical effects:
1. according to the utility model, the visible laser rays emitted by the laser emitter are used as the boundary of the demarcation region, and the characteristics that the laser paths are straighter and cannot generate angle deviation are utilized, so that the technical problems of time and labor waste and easy deviation caused by adopting a manual pull rope can be avoided; simultaneously, the rotating part and the fixing part with the pointer and the scale marks are arranged, so that the angle between the laser rays emitted by the laser transmitters on the adjacent auxiliary devices can be accurately mastered, namely the angle of two adjacent boundaries of the area is defined, and the method is simpler; therefore, the utility model can obviously improve the field area demarcation efficiency and accuracy and reduce the labor intensity of personnel;
2. according to the utility model, the display screen is arranged on the side wall of the rotating part, the laser ranging module is arranged in the rotating part, the laser ranging module, the display screen and the laser receiver are electrically connected, and the display screen can display the laser emission distance, so that the distance value between the two auxiliary devices can be obtained more intuitively and conveniently, the process of manually measuring the distance between the two auxiliary devices by using the tape measure is omitted, the labor intensity of personnel is further reduced, and the demarcation efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of an assist device;
FIG. 2 is an exploded view of the structure of the assist device;
FIG. 3 is a top view of the rotating portion;
wherein, 1, a fixing part; 2. a rotating part; 3. scale marks; 4. a pointer; 5. a laser emitter; 6. a laser receiver; 7. a transmitting hole; 8. a light-sensing hole; 9. a laser ranging module; 10. a display screen; 11. a top cover; 12. a level gauge; 13. and (5) leveling bubbles.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The utility model aims to provide a portable field area demarcation aid and a demarcation method thereof, which are used for solving the problems in the prior art, obviously improving the field area demarcation efficiency and accuracy and reducing the labor intensity of personnel.
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.
Example 1:
as shown in fig. 1 to 3, the present embodiment provides a portable field area demarcation aid, which comprises a fixed part 1 and a rotating part 2, wherein one end of the fixed part 1 is used for being inserted into soil, the other end is rotationally connected with the rotating part 2, and the mutually connected connecting ends are respectively provided with a scale mark 3 and a pointer 4 for measuring the rotation angle of the rotating part 2; a laser emitter 5 for emitting light in the horizontal radial direction is fixed to the rotating portion 2.
When the device is used, the bottom end of the fixing part 1 of one auxiliary device (called a first auxiliary device) is inserted into soil to serve as one vertex of an area to be delimited, the fixing part 1 is adjusted to ensure that the area to be delimited is vertical, meanwhile, the laser transmitter 5 is enabled to emit laser in the horizontal direction of one boundary of the area to be delimited, the boundary direction can be judged according to a ridge, then another auxiliary device (called a second auxiliary device) is inserted on a laser light path, and the distance between the first auxiliary device and the second auxiliary device is determined through a measuring device such as a tape measure, so that the distance is equal to the side length of the area to be delimited, the second auxiliary device is ensured to be vertical, and at the moment, the second auxiliary device is the second vertex of the area to be delimited; after the second auxiliary device is inserted, laser irradiates on the rotating part 2 of the second auxiliary device, such as a transmitting hole 7 opposite to the laser transmitter 5, at this time, the rotating part 2 of the second auxiliary device is rotated to enable the laser transmitter 5 to rotate through the included angle of the boundary of the area to be defined, which is usually 90 degrees, then the laser transmitter 5 is opened to transmit horizontal laser, the above steps are repeated to obtain the positions of other auxiliary devices, and further other vertexes of the area to be defined are obtained.
Therefore, in the embodiment, the laser transmitter 5 is used for emitting visible laser rays as the boundary of the demarcation region, and the characteristics that the laser paths are straighter and cannot generate angle deviation are utilized, so that the technical problems that the demarcation efficiency of the region is low and the boundary angle is easy to deviate due to the traditional mode of adopting the manual pull rope are avoided; the rotating part 2 and the fixing part 1 with the pointer 4 and the scale marks 3 are arranged at the same time, so that the angles between the laser rays emitted by the laser transmitters 5 on the adjacent auxiliary devices can be accurately mastered, namely, the angles of two adjacent boundaries of the area are defined, the angle adjusting process is simple and accurate, the angle adjusting device is suitable for defining boundary angles except right angles, and the applicability is higher; therefore, the field demarcation efficiency can be obviously improved, and the labor intensity of personnel is reduced.
It should be noted that, in the practical use process of the embodiment, the laser of the first auxiliary device does not necessarily need to face the emitting hole 7 of the laser emitter 5 on the second auxiliary device, and may be any circumferential position on the rotating portion 2 of the second auxiliary device; for example, the first auxiliary device is opposite to the point a on the rotating part 2 of the second auxiliary device, after the first auxiliary device is opposite to the point a, a worker can mark the point a, and the angle value corresponding to the point a is recorded, so that the angle required to be rotated by the rotating part 2 can be calculated according to the angle value corresponding to the laser emitting hole 7 on the second auxiliary device, and the laser emitting hole 7 on the second auxiliary device is opposite to the other boundary direction of the to-be-delimited area.
Further, the rotating portion 2 of the present embodiment is further provided with a laser receiver 6 for receiving horizontal laser, and the emitting hole 7 of the laser emitter 5 is the same as the light sensing hole 8 of the laser receiver 6 in height; by arranging the laser receiver 6, the alignment position of the photosensitive hole 8 and the emitting hole 7 can be more accurate; and the corresponding angle between the photosensitive hole 8 and the emitting hole 7 can be set by oneself, such as the angle difference is set to 90 degrees, when the photosensitive hole 8 can receive laser rays, the laser transmitter 5 can be directly opened to emit laser, and the emitted laser is mutually perpendicular to the received laser, so that the operation of the demarcating process is simpler and more convenient. Because the laser is emitted horizontally, when the light sensing hole 8 receives the laser, the emitting hole 7 and the light sensing hole 8 are on the same horizontal line, if a certain height difference exists between the emitting hole 7 and the light sensing hole 8 at the fixed position on the rotating part 2, if the light sensing hole 8 is higher than the emitting hole 7, the depth of the subsequent assistor inserted into the soil will be deeper and deeper, so as to ensure that the light sensing hole 8 on the subsequent assistor and the emitting hole 7 on the previous assistor are on the same horizontal line, therefore, the embodiment limits the emitting hole 7 and the light sensing hole 8 on the same height, so that the heights of the assistor inserted into the soil are the same, and the implementation of the process of demarcating the region is more convenient for the staff.
Specifically, in this embodiment, the fixed portion 1 and the rotating portion 2 may have a cylindrical structure with the same diameter, but are not limited to a cylindrical structure, and when the fixed portion and the rotating portion are of a cylindrical structure or other structures, the pointer 4 is disposed at an end of the rotating portion 2, and the scale line 3 is disposed at an end of the fixed portion 1; simultaneously, the laser transmitter 5 and the laser receiver 6 are arranged in the rotating part 2, and the transmitting hole 7 and the photosensitive hole 8 are arranged on the side wall of the rotating part 2; it should be further understood by those skilled in the art that no matter what shape the fixed portion 1 and the rotating portion 2 are, when the emitting hole 7 and the light sensing hole 8 are aligned, the centers of the emitting hole 7, the light sensing hole 8 and the two rotating portions 2 are all located on the optical path of the laser, so as to ensure the accuracy of defining the boundary.
In order to be convenient for confirm the distance between two adjacent assistor, be provided with display screen 10 on the rotation portion 2 lateral wall in this embodiment, inside is provided with laser ranging module 9, display screen 10, laser receiver 6 all carry out the electricity and connect, display screen 10 can show the laser emission distance to can obtain the distance numerical value between two assistor more directly perceivedly, conveniently, the process of artifical utilization tape measure distance between two assistor has been saved, further reduced personnel intensity of labour, demarcation efficiency has been improved.
The laser transmitter 5, the laser receiver 6, the laser ranging module 9 and the display screen 10 in this embodiment are all common devices in the art, and the electrical connection manner between them is well known to those skilled in the art, and will not be described in detail in this embodiment.
Further, in this embodiment, a power supply for supplying power to the electrical components on the rotating portion 2 is further disposed in the fixed portion 1; because the laser emitter 5, the laser receiver 6 and the laser ranging module 9 are all fixed on the rotating part 2, the top of the rotating part 2 is also connected with a top cover 11 for sealing the rotating part through threads, the top surface of the top cover 11 is provided with a level bubble 13 for detecting whether the fixed part 1 is vertical or not, and the fixed part 1 and the rotating part 2 are both provided with a level meter 12; in the course of the actual demarcation operation, the originally vertical fixed part 1 and the rotating part 2 may be caused to incline, and by providing the level 12 and the level bubble 13, the horizontal and vertical references can be provided for the auxiliary device when the rotating part 2 is initially inserted and subsequently rotated.
In order to facilitate insertion of the fixing portion 1 into the soil, the bottom end of the fixing portion 1 is tapered in this embodiment.
Example 2:
the embodiment also provides a portable field area demarcation method, which comprises the following steps:
1) Inserting a fixing part 1 into the soil at a set position, ensuring the fixing part 1 to be vertical through a level gauge 12 and a level bubble 13, taking the auxiliary device as one vertex of a demarcation area, wherein the direction opposite to the laser emitter 5 is the extending direction of one side of the demarcation area;
2) Rotating the rotating part 2 by a set angle, turning on a power switch, emitting laser by the laser emitter 5, inserting an auxiliary device along the laser direction, enabling the light sensing hole 8 of the laser receiver 6 to be aligned with the laser for receiving, displaying the distance between the two auxiliary devices on the display screen 10, and adjusting the position of the latter auxiliary device according to the required distance to obtain the other vertex of the delimited area;
3) Repeating the step 2), inserting a plurality of auxiliary devices to obtain all vertexes of the delimited area;
4) And (5) making ridges or planting crops along the light path in the delimited area.
By adopting the method, the area can be rapidly defined, the defining efficiency is obviously improved, and the labor intensity of staff is reduced.
When crops are planted in a community, manual planting often deviates from preset planting lines and rows, so that the planting lines and rows are uneven, the planting intervals are different, the planting density is different, the difference is large, the number of plants in a field test is inconsistent, the plots are different in growth vigor, the absorbed nutrient substances are more or less, the test uncertainty is caused, the interference factors are excessive, and the test data are inaccurate; in order to standardize the planting distance and ensure the consistency of the planting density, an auxiliary device is arranged between the two auxiliary devices in the delimited area, the distance between the auxiliary device and the end auxiliary device is adjusted to a set distance, then the rotating part 2 on the auxiliary device is rotated by a set angle, the power switch is turned on, the laser transmitter 5 emits laser, crops are planted along the laser light path, the crops can be ensured to be orderly arranged, the quantity and the density of the crops in the test field are ensured, and a foundation is laid for the accuracy of follow-up test data.
The height of the crops planted along the laser light path is lower than that of the laser light path, and the crops can not be blocked by the laser light path.
The adaptation to the actual need is within the scope of the utility model.
It should be noted that it will be apparent to those skilled in the art that the present utility model is not limited to the details of the above-described exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (8)

1. The portable field area demarcation aid is characterized by comprising a fixed part and a rotating part, wherein one end of the fixed part is used for being inserted into soil, the other end of the fixed part is rotationally connected with the rotating part, and the connecting ends of the fixed part and the rotating part are respectively provided with a scale mark and a pointer for measuring the rotation angle of the rotating part; the rotating part is fixedly provided with a laser transmitter for transmitting light rays along the horizontal radial direction;
the rotating part is also provided with a laser receiver for receiving horizontal laser, and the emitting hole of the laser transmitter is the same as the photosensitive hole of the laser receiver in setting height;
the side wall of the rotating part is provided with a display screen, a laser ranging module is arranged in the rotating part, the laser ranging module, the display screen and the laser receiver are all electrically connected, and the display screen can display the laser emission distance;
the laser of the first auxiliary device is beaten at any position on the rotating part of the second auxiliary device, and the angle required by the rotation of the laser of the second auxiliary device to the appointed boundary is calculated according to the angle position of the point where the laser is located and the angle position of the transmitting hole of the second auxiliary device; the emitting hole of the first auxiliary device and the photosensitive hole of the second auxiliary device are arranged at the same height; the angle between the light sensing hole and the emitting hole on the rotating part is automatically adjusted.
2. The portable field area demarcation aid according to claim 1, wherein a power source for powering electrical components on the rotating portion is also provided within the stationary portion.
3. The portable field area demarcation aid according to any one of claims 1-2, wherein the rotating portion top is further threadably connected with a cap for sealing thereto.
4. The portable field area demarcation aid according to claim 3, wherein a top surface of the top cover is provided with a level bubble for detecting whether the fixing portion is vertical.
5. The portable field area demarcation aid according to claim 4, wherein the stationary portion and the rotating portion are each provided with a level gauge.
6. The portable field area demarcation aid according to claim 1, wherein one end of the securing portion for insertion into soil is tapered.
7. A portable field area demarcation method comprising the steps of: 1) Inserting a fixing part into the soil at a set position, ensuring the fixing part to be vertical through a level gauge and a level bubble, taking the auxiliary device as a vertex of a demarcation area, wherein the direction opposite to the laser emitter is the extending direction of one side of the demarcation area; 2) Rotating the rotating part by a set angle, turning on a power switch, enabling the laser transmitter to emit laser, inserting an auxiliary device in the laser direction, enabling a photosensitive hole of the laser receiver to be aligned with the laser for receiving, displaying the distance between the two auxiliary devices on a display screen, and adjusting the position of the latter auxiliary device according to the required distance to obtain the other vertex of the delimited area; 3) Repeating the step 2), inserting a plurality of auxiliary devices to obtain all vertexes of the delimited area; 4) Crop plants are planted in the delimited areas.
8. The portable field area demarcation method according to claim 7, wherein an aid is further provided between the two aids in the demarcation area, the distance between the aid and the end aid is adjusted to a set distance, then the rotating part on the aid is rotated by a set angle, the power switch is turned on, the laser emitter emits laser light, and ridges or crops are made along the laser light path.
CN202110732203.XA 2021-06-30 2021-06-30 Portable field area demarcation aid and demarcation method thereof Active CN113447005B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117516348B (en) * 2024-01-04 2024-03-12 惠民县国土空间生态修复中心(惠民县土地整理储备中心) Area measurement device for land planning

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Publication number Priority date Publication date Assignee Title
GB754751A (en) * 1953-05-09 1956-08-15 Zeiss Stiftung Fixed-base telemeter
US4273225A (en) * 1979-04-10 1981-06-16 Swanson Carl R Electrically operated mast for laser-controlled levelling system
CN105638057A (en) * 2016-01-04 2016-06-08 兰州大学 Field experimental area setting device and method for setting experimental area using device
CN208366339U (en) * 2018-07-18 2019-01-11 四川农业大学 A kind of portable field polygonal head device
CN208398877U (en) * 2018-07-27 2019-01-18 青海省畜牧兽医科学院 The delimitation tool on field trial sample ground
CN212692813U (en) * 2020-08-29 2021-03-12 河南诺玛科技有限公司 Device for measuring area of field test cell

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB754751A (en) * 1953-05-09 1956-08-15 Zeiss Stiftung Fixed-base telemeter
US4273225A (en) * 1979-04-10 1981-06-16 Swanson Carl R Electrically operated mast for laser-controlled levelling system
CN105638057A (en) * 2016-01-04 2016-06-08 兰州大学 Field experimental area setting device and method for setting experimental area using device
CN208366339U (en) * 2018-07-18 2019-01-11 四川农业大学 A kind of portable field polygonal head device
CN208398877U (en) * 2018-07-27 2019-01-18 青海省畜牧兽医科学院 The delimitation tool on field trial sample ground
CN212692813U (en) * 2020-08-29 2021-03-12 河南诺玛科技有限公司 Device for measuring area of field test cell

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