CN107192457A - A kind of crop canopy temperature obtains system - Google Patents

Abstract

The invention discloses a crop canopy temperature acquisition system and relates to the technical field of agricultural information measurement. The system includes: a circular sprinkler, a plurality of temperature sensors and a customer terminal; the temperature sensor is located under the truss of the circular sprinkler, and is connected to the circular sprinkler through a fixed rod arranged in a vertical direction; and a plurality of The temperature sensors are arranged along the length direction of the truss of the circular sprinkler; when the circular sprinkler is running, the temperature sensor can move in a circle with the central tower of the circular sprinkler as the center of the circle; the customer terminal is electrically connected to the temperature sensor; the temperature sensor is used for Obtain the crop canopy temperature information and output the temperature information; the client terminal is used to receive the temperature information. The crop canopy temperature acquisition system provided by the present invention uses a circular sprinkler as a temperature sensor carrier, effectively reduces the labor cost and equipment cost of the crop canopy temperature measurement method, and has an excellent promotion prospect.

Description

A crop canopy temperature acquisition system

technical field

The invention relates to the technical field of agricultural information measurement, in particular to a crop canopy temperature acquisition system.

Background technique

Irrigation provides the necessary water for crop production and is an indispensable link in agricultural production. Sprinkler irrigation is one of the main irrigation forms in modern agricultural production. Specifically, it refers to an irrigation method that uses sprinkler irrigation equipment such as circular sprinklers to send pressurized water to the irrigation area, and sprays it into the air to form small water droplets and sprinkle it on the field. In the process of sprinkler irrigation, affected by factors such as soil water holding capacity, terrain slope, pests and diseases, there will be uneven water consumption and yield of crops, which will affect the water production efficiency of sprinkler irrigation. Therefore, in order to ensure good water production efficiency of sprinkler irrigation, it is necessary to formulate a scientific and reasonable sprinkler irrigation system according to the water consumption of crops. Canopy temperature is an important indicator of crop water consumption. Therefore, in order to formulate a reasonable irrigation system, it is essential to detect the canopy temperature of crops.

In the prior art, the temperature of the crop canopy is manually measured, and in order to ensure that the measured canopy temperature can faithfully reflect the water consumption of the crop, the canopy temperature is usually measured from 12:00 noon to 2:00 pm. Within two hours of the measurement, the staff measured the canopy temperature one by one in the area to be measured with a handheld thermometer.

In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

The method of manually measuring the temperature of the crop canopy has the defect of high labor intensity for the staff, especially when the area to be measured is large, which significantly increases the workload of the staff.

Contents of the invention

In order to solve the problem of high labor intensity of workers in the prior art by manually measuring the temperature of the crop canopy, the embodiment of the present invention provides a system for obtaining the temperature of the crop canopy, and the specific technical scheme is as follows:

A crop canopy temperature acquisition system, including: a circular sprinkler, multiple temperature sensors and a client terminal;

The temperature sensor is located below the truss of the circular sprinkler, and is connected to the circular sprinkler through a fixed rod arranged in the vertical direction; and a plurality of the temperature sensors are arranged along the truss of the circular sprinkler Arranged in the length direction of the circular sprinkler; when the circular sprinkler is running, the temperature sensor can move in a circle with the central tower of the circular sprinkler as the center of the circle;

The client terminal is electrically connected to the temperature sensor;

The temperature sensor is used to acquire the temperature information of the crop canopy and output the temperature information; the client terminal is used to receive the temperature information.

Preferably, the temperature sensor is an infrared temperature sensor.

Preferably, the fixed rod is fixedly connected to the tie bars of the circular sprinkler, and the fixed rod can be stretched vertically to adjust the distance from the temperature sensor to the crop canopy.

Preferably, the system further includes: a connecting rod, the two ends of the connecting rod are respectively fixedly connected to the two tie bars of the annular sprinkler;

The fixed rod includes an outer rod and an inner rod; the outer rod is connected to the connecting rod, and a part of the inner rod in the length direction is located inside the outer rod and can move axially along the outer rod; A positioning element is provided on the side wall of the outer rod, and the positioning element limits the movement of the inner rod along the axial direction of the outer rod.

The temperature sensor is provided at the lower end of the inner rod.

Preferably, a protective cover is connected to the lower end of the inner rod, and the temperature sensor is arranged inside the protective cover.

Preferably, the material of the protective cover is thermal insulation material.

Preferably, the system also includes at least one collector and server;

The collector is electrically connected to the temperature sensor, the server is connected to the collector through a network, and the client terminal is connected to the server through a network;

The collector is used to supply power to the temperature sensor and acquire temperature information sent by the temperature sensor and send the temperature information to the server;

The server is used for receiving and storing the temperature information, and sending the temperature information to the client terminal.

Preferably, the system further includes a receiver arranged on the end span of the circular sprinkler, and the receiver is connected to the server through a network;

The receiver is used for receiving the position information of the center pivot end span sent by the satellite navigation system, and sending the position information to the server.

Preferably, the arrangement density of the temperature sensors along the length direction of the truss of the circular sprinkler is obtained by the following method, the method comprising:

Step 1. Determine the boundary of the sprinkler irrigation area that can be covered by the circular sprinkler, and the boundary forms a first area;

Step 2. Dividing the first area with a preset number of square grids, the preset number is greater than or equal to 100, wherein the preset number refers to the grids completely located in the first area the number of grids, and the sum of the number of grids with an area greater than or equal to 1/2 of the grid area in the first region;

Step 3, taking the central tower of the circular sprinkler as the center of the circle, and taking the diameter of the circle formed by the projection of the effective measurement range of the temperature sensor on the plane where the crop canopy is located as the radius difference, in the first Draw a plurality of rings in the region, the plurality of rings do not intersect;

Step 4. When the number of grids intersecting with the circle is equal to the preset number, the number of circles is the number of temperature sensors to be used by the circular sprinkler.

Preferably, the preset number is 100.

The beneficial effects brought by the technical solution provided by the embodiments of the present invention are:

The crop canopy temperature acquisition system provided by the embodiment of the present invention uses a plurality of temperature sensors connected to the circular sprinkler to complete the temperature measurement of the crop canopy in the area where the truss turns, and at the same time, the temperature sensor transmits the measured temperature information to the client terminal , the staff check the temperature of the crop canopy through the client terminal. In the embodiment of the present invention, by using the circular sprinkler as the carrier of the temperature sensor, making full use of the characteristics of the circular sprinkler with large irrigation coverage and high degree of automation, the measurement of the canopy temperature in the large-area crop planting area is realized, effectively overcoming the The method solves the defect of high labor intensity in the prior art of manually measuring the temperature of the crop canopy, and has an excellent promotion prospect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is the structural representation of the circular sprinkler provided in the prior art;

Fig. 2 is the temperature sensor fixing method in the crop canopy temperature acquisition system provided by the embodiment of the present invention

schematic diagram;

Fig. 3 is the network topology diagram of the crop canopy temperature acquisition system provided by the embodiment of the present invention;

Fig. 4 is a schematic diagram of a method for optimizing the arrangement density of temperature sensors provided by an embodiment of the present invention.

Each mark in the accompanying drawings is respectively:

11. Center tower, 12. Drive tower, 121. Drive wheel, 13. Span; 14. Main water pipe, 15. Drop pipe, 16. Stretch bar;

21. connecting rod, 22. fixed rod, 221. outer rod, 222. inner rod, 23. positioning element,

24. Transmission line, 25. Protective cover;

3. Temperature sensor;

Ⅰ first area; Ⅱ grid; Ⅲ ring.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

An embodiment of the present invention provides a crop canopy temperature acquisition system, including: a circular sprinkler, a plurality of temperature sensors 3 and a client terminal; The fixed rod 22 of the circular sprinkler is connected with the circular sprinkler; and a plurality of temperature sensors 3 are arranged along the length direction of the truss of the circular sprinkler; make a circular motion;

The client terminal is electrically connected to the temperature sensor;

The temperature sensor is used to obtain the temperature information of the crop canopy and output the temperature information;

The client terminal is used to receive temperature information.

Among them, the circular sprinkler is a sprinkler irrigation device often used in the prior art, which has the characteristics of high degree of automation and large sprinkler coverage area. For the common structure of the circular sprinkler, see Figure 1. The circular sprinkler includes:

A central tower 11, a truss connected to the central tower 11, and a plurality of drive towers 12 arranged below the truss. Wherein, the truss includes a plurality of spans 13 (only two spans 13 are taken as an example in Fig. 1), the spans 13 are made up of steel pipes, angle irons and at least two tie bars 16, and the two tie bars 16 are parallel to the truss Extension direction setting. A driving tower 12 is provided at the junction of adjacent spans 13 , and the driving tower 12 includes a driving wheel 121 and a motor for driving the truss to rotate around the center tower 11 . At the same time, along the length direction of the truss, the main water delivery pipe 14 of the sprinkler irrigation machine is also arranged. The main water delivery pipe 14 is connected with a plurality of vertically arranged drooping pipes 15, and sprinklers are connected to the ends of the drooping pipes 15. The irrigation water is transported by the main water delivery pipe 14. To the drooping pipe 15, it is sprayed out by the shower nozzle. When the circular sprinkler is in use, the drive tower 12 drives the main water delivery pipe 14 and the drooping pipe 15 to rotate with the truss on the center tower 11. irrigated area.

In the crop canopy temperature acquisition system provided by the embodiment of the present invention, the temperature sensor 3 is arranged below the circular sprinkler truss through the fixed rod 22 arranged in the vertical direction, so that the temperature sensor 3 can be located above the crop canopy, and the temperature The sensor 3 moves in a circle with the center tower 11 of the circular sprinkler irrigation machine as the center. With the operation of the circular sprinkler irrigation machine, the temperature sensor 3 can turn around the entire irrigation area, thereby completing the measurement of the temperature of the crop canopy in the overall detection area. At the same time, the temperature sensor 3 generates temperature information from the obtained canopy temperature, and sends the temperature information to the client terminal, and the staff checks the canopy temperature through the client terminal.

In the embodiment of the present invention, by using the circular sprinkler as the carrier of the temperature sensor 3 and making full use of the characteristics of the circular sprinkler with large irrigation coverage and high degree of automation, the measurement of the canopy temperature in the large-area crop planting area is realized, effectively The invention overcomes the defect of high labor intensity in the prior art of manually measuring the temperature of the crop canopy, and can obtain the temperature of the crop canopy quickly and efficiently.

At the same time, the crop canopy temperature acquisition system provided by the embodiment of the present invention also has the characteristics of being easy to use and less affected by weather. Especially in contrast to the emerging method of measuring with thermal imagers carried by drones. Specifically, during the measurement of this measurement method, the UAV maintains a stable flight to maintain the thermal imager above the crop canopy for measurement. It is not difficult to see that in order to ensure the stable flight of the UAV, suitable weather conditions are required. Therefore, when there is a strong wind, the measurement method of the UAV carrying a thermal imager cannot be used. In the acquisition system provided by the embodiment of the present invention, the temperature sensor 3 is connected to the circular sprinkler through the fixed rod 22, so that the temperature sensor 3 can be stably positioned above the crop canopy, reducing the impact of weather factors on the temperature acquisition system , for ease of use.

Wherein, the temperature sensor 3 is an infrared temperature sensor. The infrared temperature sensor is a non-contact temperature measurement sensor with high sensitivity and measurement accuracy. And the infrared temperature sensor has a certain effective measurement range when used. When the distance between the measured object and the infrared temperature sensor is within its effective measurement range, the temperature measured by the infrared temperature sensor can faithfully reflect the surface temperature of the measured object.

In the embodiment of the present invention, referring to Fig. 3, the fixed rod 22 is fixedly connected with the tie bars 16 of the circular sprinkler, and the length of the fixed rod 22 along the vertical direction is adjustable, so as to change the distance between the temperature sensor 3 and the crop canopy. distance. By adjusting the length of the fixed rod 22 in the vertical direction, the distance between the temperature sensor 3 and the crop canopy can be within the effective measurement range of the temperature sensor 3, which ensures that the temperature of the crop canopy measured by the temperature sensor 3 is scientifically accurate sex.

Specifically, referring to FIG. 3 , in an optional implementation of the embodiment of the present invention, the canopy temperature acquisition system further includes a connecting rod 21, and the two ends of the connecting rod 21 are respectively connected to the two pulleys of the annular sprinkler. Rib 16 is fixedly connected.

The fixed rod 22 includes an outer rod 221 and an inner rod 222; the outer rod 221 is connected with the connecting rod 21, and a part of the length direction of the inner rod 222 is located inside the outer rod 221 and can move axially along the outer rod 221; A positioning element 221 is provided on the side wall, and the positioning element 221 limits the movement of the inner rod 222 along the axial direction of the outer rod 22 . The temperature sensor 3 is provided at the lower end of the inner rod 222 .

The outer rod 221 is kept fixed with the tie bar 16 of the circular sprinkler through the connecting rod 21, and the length adjustment of the overall fixed rod 22 in the vertical direction is realized by pulling out the inner rod 222 arranged inside the outer rod 221, and the positioning element is used to 23 fixes the relative positions of the inner rod 222 and the outer rod 221. At the same time, the temperature sensor 3 is arranged at the lower end of the inner rod 222, and when the inner rod 222 is pulled out axially downward along the outer rod 221, the inner rod 222 drives the temperature sensor 3 to move downward, close to the crop canopy, and realize the height adjustment of the temperature sensor 3 , to ensure the determination of the effective crop canopy temperature.

Wherein, there is no specific limitation on the connection mode between the temperature sensor 3 and the inner rod 222, for example, the temperature sensor 3 is fixed at the lower end of the inner rod 222; One end of the rod is connected to the temperature sensor 3 so that the temperature sensor 3 is located at the lower end of the inner rod 222 . The other end of the transmission line 24 can be connected to a power supply component to provide power for the temperature sensor 3 to ensure its normal use. And optionally, the outer rod 222 is integrally formed with the connecting rod 21 .

Further, the specific implementation form of the positioning element 23 is also not limited. For example, the positioning element 23 includes a positioning screw provided on the side wall of the outer rod 221, and positioning grooves provided at different heights on the side wall of the inner rod 222, and the positioning groove matches the positioning screw. The length of the fixed rod 22 can be adjusted by connecting different positioning slots with the positioning screw to change the length of the inner rod 222 located outside the outer rod 221 .

Simultaneously, the temperature sensor 3 may be affected by external factors such as rainfall and water spray in use, and the temperature of the guide measurement deviates, so the lower end of the inner rod 222 is connected with a protective cover 25, and the temperature sensor 3 is arranged on the protective cover 25 Inside, and the protective cover 25 is preferably made of thermal insulation material, so as to avoid interference caused by external factors to the temperature measurement of the temperature sensor 3 .

In addition, the canopy temperature acquisition system provided by the embodiment of the present invention also includes at least one collector and server; the collector is electrically connected to the temperature sensor 3, the server is connected to the collector through a network, and the client terminal is connected to the server through a network; It is used to supply power to the temperature sensor 3 and obtain temperature information from the temperature sensor 3 and send the temperature information to the server; the server is used to receive and store the temperature information and send the temperature information to the client terminal. The data transmission between the temperature sensor 3 and the client terminal is established through the collector and the server, which realizes the collection and storage of temperature information, which is convenient for the staff to retrieve.

Wherein, the collector can be fixed on the circular sprinkler truss, and the temperature sensor 3 is electrically connected to the collector through the transmission line 24 , and the transmission line 24 is arranged inside the inner rod 222 and the connecting rod 21 . Through the transmission line 24, the collector can provide power for the temperature sensor 3, and the temperature sensor 3 sends the measured canopy temperature to the collector. The number of collectors is not specifically limited, and there may be 1, 2, 3, etc.; and one collector can be connected to one or more temperature sensors 3 . The client terminal and the server are connected through the Internet, and there is no specific limitation on the number of client terminals. There can be one client terminal, or two or more client terminals, so as to facilitate multiple staff members to carry out Query temperature information.

Furthermore, in addition to being able to obtain the canopy temperature, it is also necessary to know the geographical location information of the specific measurement area when formulating the irrigation system. Therefore the canopy temperature acquisition system that the embodiment of the present invention provides also comprises the terminal span body that is arranged on the circular sprinkler (that is, the span body 13 farthest from the central tower 11 of the circular sprinkler, such as the rightmost one in Fig. 1 The receiver on the span body 13) is used to receive the position information of the pivot point span body acquired by the satellite navigation system, and send the position information to the server.

A satellite navigation system (English: global navigation satellite system, referred to as GNSS) receiver is a receiver used to receive a target object to determine its geographic location, and the received location information includes the longitude and latitude of the target object. In the embodiment of the present invention, the receiver is used to receive the specific position information of the end span of the circular sprinkler, especially when the temperature sensor 3 performs temperature measurement, the receiver can simultaneously receive the position information of the end span at this time, including the end The longitude and latitude of the span. At the same time, the server receives and stores the location information sent by the receiver, so that the staff can know the specific measurement progress of the canopy temperature acquisition system and the specific measurement area corresponding to the acquired temperature information.

In the embodiment of the present invention, for the effective transmission of temperature information and location information, a collection gateway 5 is provided between the collector and the server, and the collection gateway 5 is used to convert the information format of the temperature information and location information, which is convenient for sending to the server. The collection gateway 5 can be set in the main control cabinet of the circular sprinkler. The collector and the collection gateway 5 can be connected via a wireless connection or a field bus, the collection gateway 5 and the server can be connected via Ethernet or the Internet, and the receiver can be connected to the collection gateway 5 via a field bus.

In this way, through the canopy temperature acquisition system provided by the embodiment of the present invention, the staff can query information such as the position of the truss of the circular sprinkler, the temperature of the canopy of the crop, and the time of temperature acquisition.

In summary, the crop canopy temperature acquisition system provided by the embodiment of the present invention forms a network topology as shown in FIG. 3 . The temperature of the crop entering the canopy is measured by the temperature sensor 3, and the temperature information is generated and sent to the collector. The receiver receives the position information of the truss end span body positioned by the satellite navigation system, especially the position information of the end span body when the temperature sensor 3 measures the temperature of the canopy. The collector sends the collected temperature information and the received location information to the collection gateway 5, and the collection gateway 5 converts the formats of the temperature information and location information and sends them to the server. The server receives and stores temperature information and location information. At the same time, the staff checks the temperature information and location information stored in the server through client terminals, such as laptops and mobile phones, and analyzes the temperature information and location information to formulate a reasonable irrigation system.

Finally, in order to further reduce the equipment investment of the canopy temperature acquisition system provided by the embodiment of the present invention, the embodiment of the present invention optimizes the arrangement density of the temperature sensor 3 on the circular sprinkler truss, see FIG. 4 for details. The optimization method is as follows:

Step 1. Determine the boundary of the sprinkler irrigation area that the circular sprinkler can cover, and the boundary forms the first area I;

Step 2. Divide the first area I with a preset number of square grids II, the preset number is greater than or equal to 100, where the preset number refers to the number of grids II completely located in the first area I, and the grid II located in the second The sum of the number of grid II whose area in area I is greater than or equal to 1/2 of the area of grid II;

Step 3, take the central tower 11 of the circular sprinkler as the center of the circle, and take the diameter of the circle formed by the projection of the effective measurement range of the temperature sensor 3 on the plane where the crop canopy is located as the radius difference, and draw a plurality of Ring III, multiple rings III do not intersect;

Step 4. When the number of grids II intersecting with the ring is equal to the preset number, the number of ring III is the number of temperature sensors 3 required for the circular sprinkler.

Within a certain measurement range, the temperature of the canopy of the crops is not much different, so for the convenience of observation, the temperature of the canopy of the crops within a certain range remains unchanged by default. In the above method, step 1 and step 2 divide the first area I into grids, that is, the crops in each grid II have the same canopy temperature by default, so that the canopy temperature of the crops in the first area I is discrete. According to the experimental experience of those skilled in the art, when the preset number of grid II is greater than or equal to 100, the measured crop canopy temperature in different grid II not only has certain differences, but also can reflect the temperature of the first area I. The overall change trend of crop canopy temperature at different locations meets the measurement accuracy requirements. Among them, when the preset number of grid II is 100, the minimum measurement accuracy requirement is met. It can be understood that the accuracy of temperature measurement in the first region I can be adjusted by adjusting the preset number of grids II. In addition, the temperature sensor 3 has a fixed effective measurement range, the effective measurement range is in the shape of a truncated cone with the temperature sensor 3 as the top surface, and the projections of the effective measurement range on the horizontal plane at different heights are circles with different diameters. Within the effective measurement range, the temperature measured by the temperature sensor 3 can faithfully reflect the actual temperature within the range. Therefore, in step 3, the diameter of the circle formed by the projection of the effective measurement range of a temperature sensor 3 on the plane where the crop canopy is located is the radius difference to draw the ring III. It can be understood that the ring III is exactly what the temperature sensor 3 can accurately measure. area, and the number of rings III represents the number of temperature sensors 3 . Furthermore, in step 4, when the circle III crosses the grid II, it means that the temperature sensor 3 can accurately measure the temperature of the crop canopy in the grid II. Here, the overlapping part of ring III and grid II is regarded as the intersection of ring III and grid II. And in the actual production process, the size of the grid II is usually much larger than the radius difference of the ring III, so the ring III can be regarded as a circle, and when the edge of the circle passes through a certain grid II, it means that the ring III and the grid Grid II cross. It can be understood that when the number of grids II intersecting the ring III is a preset number, the temperature sensor 3 used can just acquire the canopy temperature of the crops in the first area I.

Usually, the preset number is preferably the number of grids II that meet the minimum requirement for measurement accuracy, that is, the preset number is 100. At this time, the equipment investment of the crop canopy temperature acquisition system provided by the embodiment of the present invention is further reduced by reducing the number of temperature sensors 3 used.

In addition, the canopy temperature acquisition system provided by the embodiment of the present invention can also adopt a circular sprinkler equipped with a variable irrigation system, and the variable irrigation system is used to adjust the spraying amount of the circular sprinkler. When a reasonable irrigation system is established according to the obtained crop canopy temperature in a certain area, the irrigation water volume of the area can be adjusted directly by controlling the circular sprinkler through the variable irrigation system on the circular sprinkler. This effectively shortens the time from obtaining the canopy temperature to guiding the actual irrigation through the canopy temperature, and ensures the scientific guidance of the obtained canopy temperature to the irrigation system.

To sum up, the crop canopy temperature detection system provided by the embodiment of the present invention makes full use of the characteristics of large irrigation coverage area and high degree of automation of the circular sprinkler irrigation machine to realize the measurement of the canopy temperature in the large-area crop planting area, effectively reducing the temperature of crops. The labor cost and equipment cost of the canopy temperature measurement method have excellent promotion prospects.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention Inside.

Claims (10)

1. a kind of crop canopy temperature obtains system, it is characterised in that including：Center pivot sprinkling machine, multiple temperature sensors (3) with And client terminal；

The temperature sensor (3) is located at below the truss of the center pivot sprinkling machine, and the fixation by vertically setting Bar (22) is connected with the center pivot sprinkling machine；And truss of multiple temperature sensors (3) along the center pivot sprinkling machine Length direction is arranged；When the center pivot sprinkling machine is run, the temperature sensor (3) can the center pivot sprinkling machine center Tower circles for the center of circle；

The client terminal is electrically connected with the temperature sensor (3)；

The temperature sensor (3) is used to obtain crop canopy temperature information, and the temperature information is exported；The client is whole Hold for receiving the temperature information.

2. canopy surface temperature according to claim 1 obtains system, it is characterised in that the temperature sensor (3) is infrared Temperature sensor.

3. crop canopy temperature according to claim 1 obtains system, it is characterised in that the fix bar (2) with it is described The lacing wire (16) of center pivot sprinkling machine is fixedly connected, and the fix bar (2) can vertically stretch, for adjusting the temperature Sensor (3) arrives the distance of the crop canopies.

4. crop canopy temperature according to claim 3 obtains system, it is characterised in that the system also includes：Connection Bar (21), the two ends of the connecting rod (21) are fixedly connected with two lacing wires (16) of the annular irrigation sprinkler respectively；

The fix bar (22) includes outer bar (221) and interior bar (222)；The outer bar (221) is connected with the connecting rod (21), A part on interior bar (222) length direction is located at that the outer bar (221) is internal, and can along the outer bar (221) axle To movement；Setting element (23) is provided with the side wall of the outer bar (221), the setting element (23) limits the interior bar (222) along the movement of the outer bar (221) axial direction；

The temperature sensor (3) is arranged on the lower end of the interior bar (222).

5. crop canopy temperature according to claim 4 obtains system, it is characterised in that in the interior bar (222) lower end Protective cover (25) is connected with, it is internal that the temperature sensor (3) is arranged on the protective cover (25).

6. crop canopy temperature according to claim 5 obtains system, it is characterised in that the material of the protective cover (25) For heat insulator.

7. crop canopy temperature according to claim 1 obtains system, it is characterised in that the system also includes at least one Individual collector and server；

The collector is electrically connected with the temperature sensor (3), and the server passes through network connection, institute with the collector State client terminal and pass through network connection with the server；

The collector is used to powering and obtaining the temperature that the temperature sensor (3) is sent for the temperature sensor (3) The temperature information is simultaneously sent to the server by information；

The server is used to receive, store the temperature information, and the temperature information is sent into the client terminal.

8. crop canopy temperature according to claim 7 obtains system, it is characterised in that the system also includes being arranged on The end of the center pivot sprinkling machine passes through network connection across the receiver on body, the receiver with the server；

The receiver is used for positional information of the center pivot sprinkling machine end across body for receiving satellite navigation system transmission, and will The positional information is sent to the server.

9. crop canopy temperature according to claim 1 obtains system, it is characterised in that temperature sensor (3) edge The arrangement density of the length direction of the truss of center pivot sprinkling machine is obtained by following methods, and methods described includes：

Step 1, the overlayable irrigation area border of the center pivot sprinkling machine is determined, the border surrounds first area；

Step 2, the first area is divided using the square net of predetermined number, the predetermined number is more than or waited In 100, wherein the predetermined number refers to be fully located at the number of grid in the first area, and positioned at described Area in one region is more than or equal to the quantity sum of 1/2 grid of the grid area；

Step 3, with the central tower (11) of the center pivot sprinkling machine be the center of circle, with having for one temperature sensor (3) It is semidiameter to imitate measurement range diameter of a circle of the projection formation of plane where crop canopies, is drawn in the first area Multiple annulars, the multiple annular is not intersected；

Step 4, when with the number of grid of the traffic circle be equal to the predetermined number when, the annular quantity is The quantity for the temperature sensor (3) that the center pivot sprinkling machine need to be used.

10. crop canopy temperature according to claim 9 obtains system, it is characterised in that the predetermined number is 100.