Frost prevention fan system, ventilation method and program

Abstract

To provide an anti-frost fan system, an air blowing method, and a program that can reduce crop damage throughout the whole field.SOLUTION: An anti-frost fan system 1 comprises an anti-frost fan 10, a thermal image camera 20, and an anti-frost fan control unit. The anti-frost fan 10 includes a fan for blowing air into a field, and a depression angle adjustment unit and a horizontal angle adjustment unit which adjust the blowing direction. The thermal image camera 20 acquires temperature image data indicating the temperature distribution of the field. The anti-frost fan control unit controls the depression angle adjustment unit and the horizontal angle adjustment unit based on the temperature image data, thereby adjusting the blowing direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a frost-proof fan system, a ventilation method, and a program. [Background technology]

[0002] In fields, frost prevention fans are used to protect crops from frost damage. In particular, when the field is a tea plantation, frost damage during the new bud growth period can affect yield and quality.

[0003] In Patent Document 1, the frost prevention fan system includes a plurality of frost prevention fans and a control management device for managing the operation of the plurality of frost prevention fans. The control management device has a plurality of operation control modes, including a frost prevention mode in which the frost prevention fans are used for frost prevention, and a power generation mode in which the frost prevention fans are used as generators. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-61526 Summary of the Invention [Problem to be solved by the invention]

[0005] In a farm field, there are areas where crops are less susceptible to damage and areas where they are more susceptible to damage. The frost prevention fan system disclosed in Patent Document 1 cannot detect areas where crops are less susceptible to damage and areas where they are more susceptible to damage, making it difficult to reduce damage to crops throughout the farm field.

[0006] The present invention has been made to solve the above-mentioned problems, and aims to provide a frost prevention fan system, a ventilation method, and a program that can reduce damage to crops throughout the entire field. [Means for solving the problem]

[0007] In order to achieve the object of the present invention, one aspect of the frost prevention fan system according to the present invention comprises: a frost prevention fan having a fan for blowing air into a farm field and a depression angle adjustment unit and a horizontal angle adjustment unit for adjusting the blowing direction; a thermal imaging camera that obtains temperature image data showing the temperature distribution of the field; an anti-frost fan control unit that controls the depression angle adjustment unit and the horizontal angle adjustment unit based on the temperature image data to adjust the air blowing direction; A first temperature sensor that measures a temperature LT at a position higher than the ground surface of the field and lower than the maximum height of the crop; a temperature measurement unit for obtaining temperature distribution data by correcting the temperature image data using the temperature LT measured by the first temperature sensor; Equipped with The anti-frost fan control unit controls the blowing direction of the anti-frost fan based on the temperature image data so as to blow air to a part of the field where the temperature is low. and controlling the depression angle adjustment unit and the horizontal angle adjustment unit based on the corrected temperature distribution data. It is characterized by:

[0008] a 3D camera that captures a 3D image of the field and obtains 3D image data of the field; a temperature measurement unit that corrects the temperature image data using the three-dimensional image data to obtain temperature distribution data; Equipped with The anti-frost fan control unit may control the depression angle adjustment unit and the horizontal angle adjustment unit based on the temperature distribution data.

[0010] a second temperature sensor for measuring the temperature HT of the inversion layer above the field; the temperature image data The temperature distribution of the fields included in The temperature HT of the sky measured by the second temperature sensor Find the temperature difference between a temperature measurement unit for obtaining differential temperature distribution data; Equipped with The anti-frost fan control unit is Measured by the thermal imaging camera When it is determined that the temperature in the air is higher than the temperature in the field and the temperature difference distribution data includes a portion where the temperature difference is equal to or greater than a reference value, the anti-frost fan may be operated.

[0011] a temperature distribution DB that stores at least the temperature image data; a fan control DB for storing data used to control the anti-frost fan, the fan control DB storing data indicating a horizontal angle and a depression angle in association with the temperature image data; Equipped with If the anti-frost fan control unit determines that the temperature image data measured this time is the same as or similar to any of the data previously stored in the temperature distribution DB, it may control the anti-frost fan based on data indicating the horizontal angle and depression angle stored in the fan control DB.

[0012] a temperature distribution DB that stores at least the temperature difference distribution data; a fan control DB for storing data used to control the anti-frost fan, the fan control DB storing data indicating a horizontal angle and a depression angle in correspondence with the temperature difference distribution data; Equipped with If the anti-frost fan control unit determines that the currently measured differential temperature distribution data is the same as or similar to any of the data previously stored in the temperature distribution DB, it may control the anti-frost fan based on data indicating the horizontal angle and depression angle stored in the fan control DB.

[0013] In order to achieve the object of the present invention, one aspect of the air blowing method according to the present invention includes: a frost prevention fan having a fan for blowing air into a farm field and a depression angle adjustment unit and a horizontal angle adjustment unit for adjusting the blowing direction; a thermal imaging camera that obtains temperature image data showing the temperature distribution of the field; A first temperature sensor that measures a temperature LT at a position higher than the ground surface of the field and lower than the maximum height of the crop; a temperature measurement unit for obtaining temperature distribution data by correcting the temperature image data using the temperature LT measured by the first temperature sensor; A method for blowing air into a field using a frost prevention fan system comprising: controlling the depression angle adjustment unit and the horizontal angle adjustment unit based on the temperature image data to adjust the air blowing direction; Based on the temperature image data, the blowing direction of the frost prevention fan is controlled so that the air is blown to a part of the field where the temperature is low. and controlling the depression angle adjustment unit and the horizontal angle adjustment unit based on the corrected temperature distribution data. do, It is characterized by:

[0014] In order to achieve the object of the present invention, one aspect of the program according to the present invention is to a frost prevention fan having a fan for blowing air into a farm field and a depression angle adjustment unit and a horizontal angle adjustment unit for adjusting the blowing direction; a thermal imaging camera that obtains temperature image data showing the temperature distribution of the field; A first temperature sensor that measures a temperature LT at a position higher than the ground surface of the field and lower than the maximum height of the crop; a temperature measurement unit for obtaining temperature distribution data by correcting the temperature image data using the temperature LT measured by the first temperature sensor; a computer for controlling an anti-frost fan system comprising: The depression angle adjustment unit and the horizontal angle adjustment unit are controlled based on the temperature image data to function as an anti-frost fan control unit that adjusts the air blowing direction; The anti-frost fan control unit controls the blowing direction of the anti-frost fan based on the temperature image data so as to blow air to a part of the field where the temperature is low. and controlling the depression angle adjustment unit and the horizontal angle adjustment unit based on the corrected temperature distribution data. do. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide an anti-frost fan system, a ventilation method, and a program that can reduce damage to crops throughout the entire field. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a diagram showing an anti-frost system installed in a field according to an embodiment of the present invention. [Figure 2] 1 is a diagram showing an anti-frost system according to an embodiment of the present invention; [Figure 3] 1 is a diagram showing an antifrost fan according to an embodiment of the present invention; [Figure 4] 1 is a block diagram illustrating a control device according to an embodiment of the present invention. [Figure 5] FIG. 4 is a diagram showing a temperature distribution DB according to the embodiment of the present invention. [Figure 6] FIG. 4 is a diagram showing a fan control DB according to the embodiment of the present invention. [Figure 7] 4 is a flowchart showing an air blowing process according to an embodiment of the present invention. [Figure 8]4 is a flowchart showing a temperature distribution measurement process according to the embodiment of the present invention. [Figure 9] 4 is a flowchart showing an anti-frost fan control process according to the embodiment of the present invention. [Figure 10] 10 is a flowchart showing a temperature distribution remeasurement process according to an embodiment of the present invention. [Figure 11] FIG. 10 is a diagram showing an anti-frost system according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A frost-prevention fan system and a ventilation method according to an embodiment of the present invention will be described below with reference to the drawings.

[0018] As shown in Fig. 1, the anti-frost fan system 1 according to this embodiment is used to prevent frost damage to crops R in a field. As shown in Fig. 2, the anti-frost fan system 1 includes an anti-frost fan 10 that blows air into the field, a thermal imaging camera 20 that measures the temperature distribution in the field, a three-dimensional camera 30 that captures a three-dimensional image of the field, a first temperature sensor 40L and a second temperature sensor 40H that measure the temperature of the field, and a control device 100 that controls the anti-frost fan 10. The field is, for example, a tea field, and the crop R is, for example, tea.

[0019] The frost prevention fan 10 is mounted on a support 11 erected in a farm field and includes a fan 12, a motor 13, a depression angle adjustment unit 14, a swing adjustment unit 15, and a horizontal angle adjustment unit 16, as shown in FIG. 3 . The depression angle adjustment unit 14 includes a motor and a ball screw and adjusts the depression angle of the fan 12. For example, the depression angle is adjusted within a range of 20° to 45°. The swing adjustment unit 15 includes a motor and a reducer and causes the fan 12 to swing horizontally within a swing range of 0° to 120°. In this embodiment, the swing range is set to 0°, thereby enabling the swing adjustment unit 15 to be placed in a non-swinging state in which the fan 12 does not swing. The horizontal angle adjustment unit 16 includes a motor and a reducer and adjusts the horizontal angle of the fan 12. The "horizontal angle" is set clockwise with north as the reference. For example, when the airflow direction is set to due north, the "horizontal angle" is set to 0°. Furthermore, when the airflow direction is set due west, the "horizontal angle" is set to 270°. The motor of the depression angle adjustment unit 14, the motor of the oscillation adjustment unit 15, and the motor of the horizontal angle adjustment unit 16 are controlled by the control device 100 to adjust the depression angle and horizontal angle of the fan 12. As a result, the frost prevention fan 10 can be controlled by the control device 100 to focus airflow on the cooler parts of the field. Alternatively, the frost prevention fan 10 may focus airflow on the cooler parts of the field, while the oscillation of the fan 12 and multiple frost prevention fans 10 may be used to blow air to the entire field other than the cooler parts. The airflow volume of the frost prevention fan 10 is controlled by the control device 100 via an inverter included in the frost prevention fan 10. The control device 100 controls the depression angle, horizontal angle, oscillation angle, and airflow volume of the fan 12, thereby controlling the direction and volume of the air blown by the fan 12. The anti-frost fan 10 is disposed at a height of 6 m to 10 m above the ground, for example, 8 m above the ground.

[0020] The thermal imaging camera 20 includes an infrared camera that detects the temperature of an object by detecting infrared rays, as shown in Figure 2. The thermal imaging camera 20 measures the temperature distribution of the field and outputs "temperature image data" indicating the measured temperature distribution of the field to the control device 100.

[0021] The three-dimensional camera 30 measures "three-dimensional image data" of the field, includes a stereo camera or LiDAR (Laser Imaging Detection and Ranging), and outputs "three-dimensional image data" showing the measured three-dimensional image of the field to the control device 100. The three-dimensional camera 30 has a higher resolution than the thermal imaging camera 20.

[0022] The first temperature sensor 40L is a sensor that measures the "temperature LT" of the field, and is placed at a position higher than the ground and lower than the maximum height of the crops R. The first temperature sensor 40L includes, for example, a platinum resistance thermometer. The first temperature sensor 40L outputs temperature data indicating the measured "temperature LT" of the field to the control device 100.

[0023] The second temperature sensor 40H is a sensor that measures the "temperature HT" of the inversion layer above the field, and is placed near the anti-frost fan 10. The second temperature sensor 40H includes, for example, a platinum resistance temperature sensor. The second temperature sensor 40H outputs temperature data indicating the measured "temperature HT" to the control device 100. The second temperature sensor 40H is placed at a height of 6 m to 10 m above the ground, for example, at a position of 8 m.

[0024] As shown in FIG. 4, the control device 100 includes a control unit 110, a communication unit 120, a ROM (Read Only Memory) 130, a RAM (Random Access Memory) 140, and an anti-frost fan DB (Data Base) 150.

[0025] The control unit 110 is configured by a CPU (Central Processing Unit), etc. The control unit 110 executes a program stored in the ROM 130, thereby functioning as a temperature measurement unit 111 and an anti-frost fan control unit 112.

[0026] The temperature measurement unit 111 first reads temperature data indicating the "temperature LT" measured by the first temperature sensor 40L at a position in the field that is higher than the ground and lower than the maximum height of the crop, and "temperature image data" indicating the temperature distribution of the field captured by the thermal imaging camera 20. Next, the temperature measurement unit 111 reads the "3D image data" of the field captured by the 3D camera 30, and corrects the "temperature image data" indicating the temperature distribution of the field captured by the thermal imaging camera 20 based on the "3D image data" of the field captured by the 3D camera 30 to create "temperature distribution data" of the field. Note that the "3D image data" of the field has a higher resolution than the "temperature image data" indicating the temperature distribution of the field, and therefore it is possible to obtain "temperature distribution data" of the field with a higher resolution than the "temperature image data" indicating the temperature distribution of the field captured by the thermal imaging camera 20. Next, the temperature measurement unit 111 corrects the "temperature distribution data" using the "temperature LT" measured by the first temperature sensor 40L to obtain "corrected temperature distribution data." Next, the temperature measurement unit 111 determines whether the "corrected temperature distribution data" contains any parts that are lower than the reference temperature. If it determines that the "corrected temperature distribution data" contains any parts that are lower than the reference temperature, the temperature measurement unit 111 reads temperature data indicating the "temperature HT" of the sky measured by the second temperature sensor 40H, and corrects the "corrected temperature distribution data" using the "temperature HT" of the sky measured by the second temperature sensor 40H to obtain "differential temperature distribution data." The "differential temperature distribution data" is data indicating the difference in temperature between the temperature of the field and the temperature of the sky. The differential temperature is expressed as (sky temperature) - (field temperature). For example, if the temperature of the sky is higher than that of the field, it will be a positive value. The sky temperature includes the "temperature HT" of the sky measured by the second temperature sensor 40H. The temperature of the field is shown by the "corrected temperature distribution data." On days when frost occurs, an inversion layer is formed and the temperature in the sky is higher than the field. For example, the temperature in the field is 2°C and the temperature in the sky is 5°C. In this case, the temperature difference is 3°C.

[0027] When the temperature measurement unit 111 determines that the temperature distribution data indicates that the temperature above the field is higher and that the temperature difference is equal to or greater than a reference value, the antifrost fan control unit 112 controls the antifrost fan 10 to start blowing air. The reference value is, for example, 3°C. Specifically, the antifrost fan control unit 112 reads data stored in the temperature distribution DB 151, including a serial number (No.), the measurement date and time, the temperature LT, the temperature HT, the temperature image data, the three-dimensional image data, the temperature distribution data, the corrected temperature distribution data, and the temperature difference distribution data. The antifrost fan control unit 112 determines whether the currently measured data is the same as or similar to any of the data previously stored in the temperature distribution DB 151. The method for determining similarity is not particularly limited, and similarity determination using AI (artificial intelligence) or machine learning may be used. For example, for the "differential temperature temperature distribution data," the feature points of the images of the currently measured "differential temperature temperature distribution data" and the previously stored "differential temperature temperature distribution data" in the temperature distribution DB 151 are matched to obtain a similarity. If the obtained similarity is equal to or greater than a reference value, the data is determined to be similar. For the "temperature LT" and "temperature HT," the similarity is determined based on whether the difference between the currently measured temperature data and the previously stored temperature data in the temperature distribution DB 151 is equal to or less than a reference value. The anti-frost fan control unit 112 determines the data to be similar if one or more of the "temperature LT," "temperature HT," "temperature image data," "3D image data," "temperature distribution data," "corrected temperature distribution data," and "differential temperature temperature distribution data" are similar. If the currently measured data is determined to be the same as or similar to any of the previously stored data in the temperature distribution DB 151, the anti-frost fan control unit 112 controls the anti-frost fan based on the past performance. In this case, the anti-frost fan control unit 112 refers to the fan control DB 152 that controlled the anti-frost fan when the same or similar data was stored in the temperature distribution DB 151 in the past, and controls the anti-frost fan based on this control data.As shown in FIG. 6 , the fan control DB 152 stores a serial number “No.”, the “date and time” of control, and data indicating the “depression angle,” “horizontal angle,” “oscillation angle,” and “air volume” of the frost-proof fan 10, in association with each other. The serial number “No.” and the “date and time” of control stored in the fan control DB 152 correspond to the serial number “No.” stored in the temperature distribution DB 151 and the “date and time” of measurement. The frost-proof fan control unit 112 stores data indicating the “depression angle,” “horizontal angle,” “oscillation angle,” and “air volume” of the frost-proof fan 10 currently controlled in association with each other in the fan control DB 152. On the other hand, if it is determined that the measured data is not similar to any of the data previously stored in the temperature distribution DB 151, the frost-proof fan control unit 112 controls the frost-proof fan based on the measured data. For example, the antifrost fan control unit 112 controls the antifrost fan 10 so that it blows air more strongly to parts of the field where the temperature is low or the temperature difference is large, which are obtained from the "corrected temperature distribution data" or the "temperature difference temperature distribution data." At this time, the antifrost fan control unit 112 stores data indicating the "depression angle," "horizontal angle," "oscillation angle," and "air volume" of the antifrost fan 10 that was controlled this time in the fan control DB 152, in association with each other.

[0028] The communication unit 120 receives data output from the thermal imaging camera 20, the three-dimensional camera 30, the first temperature sensor 40L, and the second temperature sensor 40H, and outputs data to control the anti-frost fan 10. The communication unit 160 is configured with a wired or wireless communication module such as a wired or wireless LAN (Local Area Network) or Bluetooth (registered trademark).

[0029] The ROM 130 is made up of a non-volatile memory such as a flash memory, and stores programs for realizing various functions of the control unit 110 as described above. The RAM 140 is made up of a volatile memory, and is used as a working area for the control unit 110 to execute programs for performing various processes.

[0030] The anti-frost fan DB 150 stores data for controlling the anti-frost fan system 1, and includes a temperature distribution DB 151 and a fan control DB 152.

[0031] As shown in Figure 5, the temperature distribution DB 151 stores measured data, and stores a serial number "No.", the "date and time" of measurement, the "temperature LT" measured by the first temperature sensor 40L, the "temperature HT" measured by the second temperature sensor 40H, "temperature image data" showing the temperature distribution of the field captured by the thermal imaging camera 20, "three-dimensional image data" of the field captured by the three-dimensional camera 30, "temperature distribution data" of the field obtained by correcting the "temperature image data" based on the "three-dimensional image data", "corrected temperature distribution data" obtained by correcting the "temperature distribution data" using the "temperature LT", and "differential temperature distribution data" obtained by correcting the "corrected temperature distribution data" using the "temperature HT".

[0032] 6, the fan control DB 152 stores data on the control of the frost-proof fan 10, and stores a serial number "No.", the "date and time" of the control, and data indicating the "depression angle," "horizontal angle," "oscillation angle," and "air volume" of the frost-proof fan 10 in association with each other. The serial number "No." and the "date and time" of the control stored in the fan control DB 152 correspond to the serial number "No." stored in the temperature distribution DB 151 and the "date and time" of the measurement.

[0033] Next, the air blowing process performed by the frost prevention fan system 1 will be described.

[0034] In response to a user's instruction to start the air blowing process or a set timer, the frost-proof fan system 1 starts the air blowing process shown in FIG.

[0035] First, the temperature measurement unit 111 starts the temperature distribution measurement process (step S101). When the temperature distribution measurement process shown in Fig. 8 is executed, the temperature measurement unit 111 reads temperature data indicating the "temperature LT" measured by the first temperature sensor 40L at a position in the field that is higher than the ground and lower than the maximum height of the crop (step S201). The read temperature data is stored in the temperature distribution DB 151.

[0036] Next, the temperature measurement unit 111 reads "temperature image data" showing the temperature distribution of the farm field captured by the thermal imaging camera 20 (step S202). The read heat data is stored in the temperature distribution DB 151.

[0037] Next, the temperature measurement unit 111 reads the "three-dimensional image data" of the farm field captured by the three-dimensional camera 30 (step S203). The read three-dimensional image data is stored in the temperature distribution DB 151.

[0038] Next, the temperature measurement unit 111 corrects the "temperature image data" showing the temperature distribution of the field captured by the thermal imaging camera 20 based on the "three-dimensional image data" of the field captured by the three-dimensional camera 30 to create "temperature distribution data" of the field (step S204). The "temperature distribution data" of the field is stored in the temperature distribution DB 151. Note that the "three-dimensional image data" of the field has a higher resolution than the "temperature image data" showing the temperature distribution of the field, so it is possible to obtain "temperature distribution data" of the field with a higher resolution than the "temperature image data" showing the temperature distribution of the field captured by the thermal imaging camera 20.

[0039] Next, the temperature measurement unit 111 corrects the "temperature distribution data" using the "temperature LT" measured by the first temperature sensor 40L to obtain "corrected temperature distribution data" (step S205). The "corrected temperature distribution data" is stored in the temperature distribution DB 151.

[0040] Next, returning to the air blowing process shown in Fig. 7, the temperature measurement unit 111 determines whether or not there is a part in the "corrected temperature distribution data" that is lower than the reference temperature (step S102). The reference temperature is a temperature at which frost may form, for example, 2°C. If it is determined that there is no part in the "corrected temperature distribution data" that is lower than the reference temperature (step S102; NO), the process returns to step S101 and repeats step S101.

[0041] If it is determined that the "corrected temperature distribution data" has a portion that is lower than the reference temperature (step S102; YES), the temperature measurement unit 111 reads temperature data indicating the temperature HT of the sky measured by the second temperature sensor 40H (step S103). The "temperature HT" is stored in the temperature distribution DB 151.

[0042] Next, the temperature measurement unit 111 corrects the "corrected temperature distribution data" using the "temperature HT" of the sky measured by the second temperature sensor 40H to obtain "differential temperature distribution data" (step S104). The "differential temperature distribution data" is stored in the temperature distribution DB 151. The "differential temperature distribution data" is data indicating the difference in temperature between the temperature of the field and the temperature of the sky. The differential temperature is expressed as (sky temperature) - (field temperature), and if the temperature of the sky is higher than that of the field, for example, it will be a positive value. On days when frost falls, an inversion layer is formed and the temperature of the sky is higher than that of the field; for example, the temperature of the field is 2°C and the temperature of the sky is 5°C. In this case, the differential temperature is 3°C.

[0043] Next, the temperature measurement unit 111 determines whether or not the "temperature difference distribution data" contains any areas where the temperature in the sky is higher than the field and the temperature difference is equal to or greater than a reference value (step S105). The reference value is, for example, 3°C. If it is determined that the "temperature difference distribution data" contains no areas where the temperature in the sky is higher than the field and the temperature difference is equal to or greater than the reference value (step S105; NO), the process returns to step S101, and steps S101 to S105 are repeated.

[0044] Next, when it is determined that the "temperature difference temperature distribution data" includes a portion where the temperature above the field is higher and the temperature difference is equal to or greater than a reference value (step S105; YES), the antifrost fan control unit 112 starts the antifrost fan control process (step S106). When the antifrost fan control process shown in FIG. 9 is executed, the antifrost fan control unit 112 reads the data stored in the temperature distribution DB 151 (step S301). The data stored in the temperature distribution DB 151 includes a "No." which is a serial number, the "date and time" of measurement, the "temperature LT", the "temperature HT", the "temperature image data", the "three-dimensional image data", the "temperature distribution data", the "corrected temperature distribution data", and the "temperature difference temperature distribution data".

[0045] The antifrost fan control unit 112 determines whether the currently measured data is the same as or similar to any of the data previously stored in the temperature distribution DB 151 (step S302). The method for determining similarity is not particularly limited, and similarity determination using AI (artificial intelligence) or machine learning may be used. For example, for the "differential temperature temperature distribution data," the similarity is obtained by matching feature points between the image of the currently measured "differential temperature temperature distribution data" and the "differential temperature temperature distribution data" previously stored in the temperature distribution DB 151. If the obtained similarity is equal to or greater than a reference value, it is determined that the data are similar. For the "temperature LT" and "temperature HT," it is determined whether the difference between the currently measured temperature data and the temperature data previously stored in the temperature distribution DB 151 is equal to or less than a reference value. The antifrost fan control unit 112 determines that the data are similar if one or more of the "temperature LT," "temperature HT," "temperature image data," "3D image data," "temperature distribution data," "corrected temperature distribution data," and "differential temperature temperature distribution data" are similar.

[0046] If it is determined that the currently measured data is the same as or similar to any of the data previously stored in the temperature distribution DB 151 (step S302; YES), the antifrost fan control unit 112 controls the antifrost fan 10 based on the past data (step S303). In this case, the antifrost fan control unit 112 references the fan control DB 152 that controlled the antifrost fan 10 when the same or similar data was previously stored in the temperature distribution DB 151, and controls the antifrost fan 10 based on this control data. As shown in FIGS. 5 and 6, the fan control DB 152 stores a serial number "No.", a "date and time" of control, and data indicating the "depression angle," "horizontal angle," "oscillation angle," and "air volume" of the antifrost fan 10, in association with each other. The serial number "No." and the "date and time" of control stored in the fan control DB 152 correspond to the serial number "No." stored in the temperature distribution DB 151 and the "date and time" of measurement. The anti-frost fan control unit 112 stores data indicating the "depression angle," "horizontal angle," "oscillation angle," and "air volume" of the anti-frost fan 10 controlled this time in the fan control DB 152 in association with each other.

[0047] If it is determined that the measured data is not similar to any of the data previously stored in the temperature distribution DB 151 (step S302; NO), the antifrost fan control unit 112 controls the antifrost fan 10 based on the measured data (step S304). For example, the antifrost fan control unit 112 controls the antifrost fan 10 so that it blows air to an area of ​​the field where the temperature is low or the temperature difference is large, as obtained from the "corrected temperature distribution data" or the "temperature difference temperature distribution data." Preferably, the antifrost fan control unit 112 also controls the fan to increase the airflow so that more air can be supplied to that area. At this time, the antifrost fan control unit 112 stores data indicating the "depression angle," "horizontal angle," "oscillation angle," and "airflow" of the currently controlled antifrost fan 10 in the fan control DB 152, in association with each other.

[0048] 7, the temperature measurement unit 111 starts the temperature distribution remeasurement process (step S107). When the temperature distribution remeasurement process shown in FIG. 10 is executed, the temperature measurement unit 111 reads temperature data indicating the "temperature LT" and "temperature HT" measured by the first temperature sensor 40L and the second temperature sensor 40H (step S401). The read temperature data is stored in the temperature distribution DB 151.

[0049] Next, the temperature measurement unit 111 reads "temperature image data" showing the temperature distribution of the farm field captured by the thermal imaging camera 20 (step S402). The read "temperature image data" is stored in the temperature distribution DB 151.

[0050] Next, the temperature measurement unit 111 reads the "three-dimensional image data" of the farm field captured by the three-dimensional camera 30 (step S403). The read "three-dimensional image data" is stored in the temperature distribution DB 151.

[0051] Next, the temperature measurement unit 111 corrects the "temperature image data" captured by the thermal imaging camera 20 based on the "three-dimensional image data" of the field captured by the three-dimensional camera 30 to create "temperature distribution data" of the field (step S404). The "temperature distribution data" of the field is stored in the temperature distribution DB 151.

[0052] Next, the temperature measurement unit 111 corrects the "temperature distribution data" using the "temperature LT" measured by the first temperature sensor 40L to obtain "corrected temperature distribution data" (step S405). The "corrected temperature distribution data" is stored in the temperature distribution DB 151.

[0053] Next, the temperature measurement unit 111 corrects the "corrected temperature distribution data" using the "temperature HT" in the sky measured by the second temperature sensor 40H to recreate the "temperature difference distribution data" (step S406). The recreated "temperature difference distribution data" is stored in the temperature distribution DB 151.

[0054] Next, returning to the air blowing process shown in FIG. 7, the temperature measurement unit 111 determines whether or not the recreated "temperature difference temperature distribution data" includes any portion where the temperature difference is equal to or greater than the reference value (step S108).

[0055] Next, if it is determined that the recreated "temperature difference distribution data" contains a portion where the temperature difference is equal to or greater than the reference value (step S108; YES), the antifrost fan control unit 112 controls the antifrost fan based on the recreated "temperature difference distribution data" (step S109). For example, the antifrost fan control unit 112 controls the antifrost fan 10 so as to blow air to a portion of the field where the temperature obtained from the recreated "temperature difference distribution data" is low or where the temperature difference is large. Preferably, the antifrost fan control unit 112 also controls to increase the air volume so that more air can be supplied to that portion. Thereafter, the process returns to step S107.

[0056] If it is determined that the recreated "temperature difference distribution data" does not contain any portion where the temperature difference is equal to or greater than the reference value (step S108; NO), the anti-frost fan 10 is stopped (step S110). After that, the air blowing process is terminated.

[0057] As described above, the frost-prevention fan system 1 of this embodiment includes a thermal imaging camera 20 that acquires "temperature image data" showing the temperature distribution in the field, and a frost-prevention fan control unit 112 that controls the depression angle adjustment unit and horizontal angle adjustment unit based on the "temperature image data" to adjust the airflow direction, thereby reducing damage to crops throughout the field. The system also includes a 3D camera 30 that captures 3D images of the field and acquires "3D image data" of the field. The "temperature image data" can then be corrected using the "3D image data" to obtain "temperature distribution data" of the field with higher resolution. This allows for more accurate adjustment of the airflow direction. Furthermore, the "temperature image data" can be corrected using the temperature LT measured by the first temperature sensor 40L to obtain "corrected temperature distribution data." Furthermore, the "temperature image data" can be corrected using the temperature HT measured by the second temperature sensor 40H to obtain "temperature difference temperature distribution data," allowing for more accurate adjustment of the airflow direction.

[0058] (Variation) In the above-described embodiment, the frost prevention fan system 1 adjusts the airflow direction of the frost prevention fan 10 based on the “temperature difference distribution data” corrected by the sky temperature HT. However, the frost prevention fan system 1 may also adjust the airflow direction of the frost prevention fan 10 based on at least the “temperature image data” obtained by the thermal imaging camera 20. Even in this case, damage to crops throughout the field can be reduced. The frost prevention fan system 1 may also correct the “temperature image data” using one or more of the “3D image data” obtained by the 3D camera 30, the temperature LT measured by the first temperature sensor 40L, and the sky temperature HT measured by the second temperature sensor 40H, and then adjust the airflow direction of the frost prevention fan 10 based on the corrected data. For example, the “temperature image data” may be corrected using either the temperature LT measured by the first temperature sensor 40L or the sky temperature HT measured by the second temperature sensor 40H, and the airflow direction of the frost prevention fan 10 may be adjusted using the data. Furthermore, the "temperature image data" may be corrected using the temperature LT measured by the first temperature sensor 40L and the temperature HT of the sky measured by the second temperature sensor 40H, and the data may be used to adjust the airflow direction of the anti-frost fan 10. This also reduces damage to crops throughout the entire field.

[0059] The above-described embodiment of the anti-frost fan system 1 has been described as including a thermal imaging camera 20. However, this is not limiting. The anti-frost fan system 1 may further include a visible light camera 50 that captures images of the field, as shown in FIG. 11 . In this case, the visible light camera 50 captures images of the field and outputs "visible light image data" of the captured field to the control device 100. The control unit 110 analyzes the "visible light image data" using image analysis to extract discolored areas and stores data indicating the discolored areas in the field in the anti-frost fan DB 150. For example, if the field is a tea plantation, the control unit 110 extracts tea leaves using image analysis and extracts areas where the tea leaves are browner than the reference color. Based on the data indicating the discolored areas, the control unit 110 controls the anti-frost fan 10 to blow more air strongly to areas of the field corresponding to the discolored areas. Furthermore, by storing data indicating discolored areas in the field in the frost prevention fan DB 150, the control unit 110 can control the frost prevention fan 10 to blow more strongly toward the discolored areas based on the data indicating the discolored areas from the next fiscal year onwards. In this case, it is possible to protect the first crop of tea from frost damage.

[0060] Furthermore, the core part of the air blowing process executed by the control device 100, which is composed of a CPU, RAM, ROM, etc., can be executed using an ordinary portable information terminal (smartphone, tablet PC), personal computer, etc., without relying on a dedicated system. For example, a computer program for executing the above-described operations may be stored and distributed on a computer-readable recording medium (such as a flexible disk, a CD-ROM (Compact Disc Read Only Memory), or a DVD-ROM (Digital Versatile Disc Read Only Memory)), and this computer program may be installed on an information terminal, etc., to configure an information terminal that executes the above-described processes. Furthermore, this computer program may be stored in a storage device of a server device on a communication network such as the Internet, and an ordinary information processing terminal, etc., may download the computer program to configure an information processing device.

[0061] Furthermore, when the function of the air blowing process is shared between an OS (Operating System) and an application program, or is realized by the OS and the application program working together, only the application program portion may be stored in a recording medium or storage device.

[0062] It is also possible to superimpose a computer program on a carrier wave and distribute it over a communications network. For example, the computer program may be posted on a bulletin board system (BBS) on the communications network and distributed over the network. The computer program may then be started and executed under the control of an OS in the same way as other application programs, thereby enabling the above-described processing to be performed.

[0063] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to such specific embodiments, and the present invention includes the inventions described in the claims and their equivalents. [Explanation of symbols]

[0064] 1. Frost prevention fan system 10...Frost prevention fan 11...Strut 12...Fan 13...Motor 14…Depression angle adjustment section 15... Head swing adjustment section 16...Horizontal angle adjustment section 20...Thermal imaging camera 30...3D camera 40L...First temperature sensor 40H...Second temperature sensor 50...Visible light camera 100...Control device 110...Control unit 120…Communications Department 130...ROM 140...RAM 150...Frost prevention fan DB DB151…Temperature distribution DB152...Fan control 111...Temperature measurement section 112...Frost prevention fan control unit R…Crop

Claims

1. a frost prevention fan having a fan for blowing air into a farm field and a depression angle adjustment unit and a horizontal angle adjustment unit for adjusting the blowing direction; a thermal imaging camera that obtains temperature image data showing the temperature distribution of the field; an anti-frost fan control unit that controls the depression angle adjustment unit and the horizontal angle adjustment unit based on the temperature image data to adjust the air blowing direction; a first temperature sensor for measuring a temperature LT at a position higher than the ground surface and lower than the maximum height of the crop in the field; a temperature measurement unit for obtaining temperature distribution data by correcting the temperature image data using a temperature LT measured by the first temperature sensor; Equipped with the anti-frost fan control unit controls the blowing direction of the anti-frost fan based on the temperature image data so as to blow air to a part of the field with a low temperature, and controls the depression angle adjustment unit and the horizontal angle adjustment unit based on the corrected temperature distribution data. A frost prevention fan system.

2. a three-dimensional camera that captures a three-dimensional image of the field and obtains three-dimensional image data of the field; a temperature measurement unit that corrects the temperature image data using the three-dimensional image data to obtain temperature distribution data; Equipped with The anti-frost fan control unit controls the depression angle adjustment unit and the horizontal angle adjustment unit based on the temperature distribution data.

2. The frost-proof fan system according to claim 1.

3. a second temperature sensor for measuring the temperature HT of the inversion layer above the field; a temperature measurement unit that obtains temperature difference data by calculating a temperature difference between the temperature distribution of the field included in the temperature image data and the temperature HT of the sky measured by the second temperature sensor; Equipped with The anti-frost fan control unit operates the anti-frost fan when it is determined that the temperature in the air is higher than the temperature of the field measured by the thermal imaging camera and that the temperature difference distribution data includes a portion where the temperature difference is equal to or greater than a reference value.

2. The frost-proof fan system according to claim 1.

4. a temperature distribution DB that stores at least the temperature image data; a fan control DB for storing data used to control the anti-frost fan, the fan control DB storing data indicating a horizontal angle and a depression angle in association with the temperature image data; Equipped with When the anti-frost fan control unit determines that the temperature image data measured this time is the same as or similar to any of the data previously stored in the temperature distribution DB, the anti-frost fan control unit controls the anti-frost fan based on the data indicating the horizontal angle and depression angle stored in the fan control DB.

2. The frost-proof fan system according to claim 1.

5. a temperature distribution DB that stores at least the temperature difference distribution data; a fan control DB for storing data used to control the anti-frost fan, the fan control DB storing data indicating a horizontal angle and a depression angle in association with the temperature difference distribution data; Equipped with When it is determined that the currently measured differential temperature distribution data is the same as or similar to any of the data previously stored in the temperature distribution DB, the antifrost fan control unit controls the antifrost fan based on the data indicating the horizontal angle and depression angle stored in the fan control DB.

4. The frost-proof fan system according to claim 3.

6. a frost prevention fan having a fan for blowing air into a farm field and a depression angle adjustment unit and a horizontal angle adjustment unit for adjusting the blowing direction; a thermal imaging camera that obtains temperature image data showing the temperature distribution of the field; a first temperature sensor for measuring a temperature LT at a position higher than the ground surface and lower than the maximum height of the crop in the field; a temperature measurement unit for obtaining temperature distribution data by correcting the temperature image data using a temperature LT measured by the first temperature sensor; A method for blowing air into a field using a frost prevention fan system comprising: controlling the depression angle adjustment unit and the horizontal angle adjustment unit based on the temperature image data to adjust the air blowing direction; controlling the blowing direction of the frost prevention fan based on the temperature image data so as to blow air to a part of the field where the temperature is low, and controlling the depression angle adjustment unit and the horizontal angle adjustment unit based on the corrected temperature distribution data. A method of blowing air characterized by the above.

7. a frost prevention fan having a fan for blowing air into a farm field and a depression angle adjustment unit and a horizontal angle adjustment unit for adjusting the blowing direction; a thermal imaging camera that obtains temperature image data showing the temperature distribution of the field; a first temperature sensor for measuring a temperature LT at a position higher than the ground surface and lower than the maximum height of the crop in the field; a temperature measurement unit for obtaining temperature distribution data by correcting the temperature image data using a temperature LT measured by the first temperature sensor; a computer for controlling an anti-frost fan system comprising: The depression angle adjustment unit and the horizontal angle adjustment unit are controlled based on the temperature image data to function as an anti-frost fan control unit that adjusts the air blowing direction; the anti-frost fan control unit controls the blowing direction of the anti-frost fan based on the temperature image data so as to blow air to a part of the field with a low temperature, and controls the depression angle adjustment unit and the horizontal angle adjustment unit based on the corrected temperature distribution data. program.

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