A spatial detection method for the temperature field of the inner wall of a mobile electrical room in a polar environment

Abstract

The present invention discloses a spatial detection method for the temperature field of an inner wall. The pan-tilt of a linear array infrared temperature measuring camera is installed on the top wall of an electrical room, and the probe of the linear array infrared temperature measuring camera is adjusted so that the pan-tilt drives the probe of the linear array infrared temperature measuring camera to rotate, thereby forming a measurement coverage of the entire space; the temperature data is stored as an initial array (θ, β, T); the obtained data is converted to obtain an array (x', y', T'), and the array is spliced ​​to form an actual temperature distribution diagram of the measured inner wall; finally, the temperature data corresponding to each coordinate in each reserved rectangular area is output to a computer and imported into MATLAB for data processing, so as to obtain a temperature color distribution diagram of each inner wall side wall of the electrical room. The present invention can make the temperature field inside the electrical room be measured more comprehensively and accurately, and at the same time improve the problem of realizing the coordinated control of various indoor environmental indicators and the huge energy consumption of operation.

Description

Technical Field

[0001] The invention relates to a spatial temperature field detection method, in particular to a method for detecting the temperature field of the inner wall of a rectangular electrical room when electrical equipment is running. Background Art

[0002] Electrical equipment will generate a lot of heat when working under actual power. After the main body of the electrical room module is built, an external temperature measurement and control system is needed to detect the temperature field of the inner wall of the electrical room and make timely adjustments to ensure that the temperature of the electrical room is within the normal range. The temperature of the electrical room not only affects the physical condition and working environment of the indoor staff, but also has a close relationship with the safe operation of the equipment in the electrical room. The equipment will have a certain temperature due to internal losses. If the ambient temperature in the electrical room is too high at this time, the heat of the equipment cannot be dissipated in time, and the equipment will stop working due to overheating or even be damaged. At present, based on the existing research, the air inside and outside the electrical room interact with each other, and when detecting the inner wall temperature field, many temperature points are collected, the data volume is large, and the coverage is incomplete, which cannot meet the needs of actual applications. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a spatial detection method for the temperature field of the inner wall of a movable electrical room in a polar environment, so that the internal temperature field of the electrical room can be measured more comprehensively and accurately, while improving the coordinated control of various indoor environmental indicators and the problem of huge energy consumption in operation.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A method for spatially detecting the temperature field of the inner wall of a mobile electrical room in a polar environment of the present invention comprises the following steps:

[0006] Step 1: Establish a three-dimensional rectangular coordinate system with the top wall of the rectangular electrical room as the xy plane and the center of the top wall as the coordinate origin, where the y-axis is perpendicular to the right wall of the electrical room and the right direction is the positive direction, the x-axis is perpendicular to the y-axis and the forward direction is the positive direction, and the z-axis is perpendicular to the top wall and points into the room;

[0007] Step 2, install the pan / tilt of the linear array infrared temperature measuring camera at the coordinate origin of the top wall of the electrical room and adjust the infrared rays emitted by the probe of the linear array infrared temperature measuring camera to form a vertical plane and form a vertical infrared line segment with a height of l on one side of the side wall to be measured, the vertex of which is located on the top wall, the upper end point of the infrared line segment with a height of l is recorded as a0, and the lower end point is recorded as b0; the upper end point and the lower end point are respectively connected to the infrared emission point, and the angle formed is β0;

[0008] Step 3, the linear array infrared temperature measuring camera rotates around the z-axis from θ0 to π-θ0 to measure the temperature of the side wall at a height of l, and stores the temperature data as an initial array (θ, β, T), wherein the rotation angle θ is the angle between the component of the infrared light projected by the temperature measuring probe on the xy plane and the positive semi-axis of the x-axis on the xy plane; β is the angle between the line connecting the lowest point of the vertical infrared line segment and the top center of the electrical room and the xy plane, the rotation angles θ and β mark the measured positions, T represents the temperature corresponding to the measured position, the initial value of θ is θ0, and the initial value of β is β0;

[0009] When measuring the left and right side walls in the y-axis direction, θ0 = arctan (W / L); when measuring the front and rear side walls in the x-axis direction, θ0 = arctan (L / W), where W is the width of the left and right side walls in the y-axis direction, and L is the width of the front and rear side walls in the x-axis direction;

[0010] Step 4: The linear array infrared temperature measuring camera determines whether n*β0<γ0, γ0=arctan(2H / W), n is the number of horizontal temperature measurements performed by the temperature measuring probe, and H is the height of the inner wall of the measured electrical room; if yes, proceed to the next step, otherwise proceed to step 7;

[0011] Step 5: The pan-tilt head drives the probe to rotate downward around the x-axis by an angle β0, and then repeats step 3 to continue to measure the temperature from the bottom of the first measurement height downward and record the temperature data; all temperature data obtained for each line segment with a measurement height of l are stored as a set of initial arrays;

[0012] Step 6, repeat steps 4 and 5 until the temperature of the side wall is measured and recorded;

[0013] Step 7: The pan / tilt drives the probe to rotate so that the infrared plane emitted by the probe is in a vertical plane and the vertex of a vertical line with a height of l formed on the next side wall to be measured is located on the top wall, and then steps 3 to 7 are repeated until all four side wall temperatures are measured and the temperature data are stored;

[0014] Step 8: After measuring the temperature field of the four side walls of the electrical room, perform temperature data conversion. The specific steps are as follows:

[0015] In the first step, the data containing temperature information and corresponding position information measured on each line segment L corresponding to each set of initial data are mirrored with the horizontal midline of each line segment L as the symmetry axis to obtain an inverted line segment L. T , the upper endpoint of the inverted line segment is recorded as a, and the lower endpoint is recorded as b; the temperature data at a is the temperature data at b0, the temperature data at b is the temperature data at a0, and the data at other positions are inverted one by one; the angle formed by connecting points a and b with the infrared emission point is still β0;

[0016] The second step is to invert the line segment L T Divide the line into k segments through k+1 points, k is a positive integer, and record each line segment l from point a, each dividing point to point b as i1, i2, i3, ....i m .、i k+1 , and record the temperature data corresponding to each point;

[0017] The third step is to measure the inner wall of the electrical room with a height of H and a width of L. Take the lower left corner of the inner wall of the electrical room as the origin, and establish a plane rectangular coordinate system o'-x'y' with the horizontal bottom edge and vertical side passing through each origin as the x' axis and y' axis, where the x' axis is positive to the right; the y' axis is positive vertically upward; establish a conversion array (x', y', T'), where (x', y') represents the position coordinates of the measuring point, and T' represents the temperature data corresponding to the measuring point position (x', y'); the number of horizontal rotations of the thermometer to measure the temperature is n, and for each inverted line segment L T i on m The relationship between the point and the transformation array (x', y', T') is as follows, where m = 1, 2, 3, 4..... k, k+1:

[0018] When θ∈[arctan(L / W),π / 2): i m The coordinates (x',y') of the point are:

[0019] (W / (2tanθ)+L / 2,H-tan[(n-1)β0]*W / (2sinθ)-{tan(nβ0)-tan[(n-1)β0]}*(W / (2sinθ))*(m-1) / k)

[0020] When θ=π / 2: i m The coordinates (x',y') of the point are:

[0021] (L / 2,H-tan[(n-1)β0]*W / (2sinθ)-{tan(nβ0)-tan[(n-1)β0]}*(W / (2sinθ))*(m-1) / k)

[0022] When θ∈(π / 2,π-arctan(L / W)]: i m The coordinates (x',y') of the point are:

[0023] (L / 2-W / [2tan(π-θ)],H-tan[(n-1)β0]*W / (2sinθ)-{tan(nβ0)-tan[(n-1)β0]}*(W / (2sinθ))*(m-1) / k)

[0024] The fourth step is to transform the inverted line segments L T Delete the points that do not satisfy x'∈[0,L],y'∈[0,H];

[0025] Step 9. The thermometer outputs the temperature data corresponding to each coordinate in each retained rectangular area to the computer and imports it into MATLAB for data processing. Each temperature data is compared with the standard color card to obtain the color corresponding to the temperature value, and then a color distribution map corresponding to the temperature of each point on the inner wall of the electrical room is obtained.

[0026] Compared with the prior art, the advantages of the present invention are as follows: the present invention realizes the detection of the temperature field space of the inner wall of a movable electrical room in a polar environment, the method is simple to operate and low in cost, and can ensure the full range detection of the temperature field in the space, thereby ensuring the measurability of the temperature field of the inner wall of the electrical room and the safety of equipment operation and personnel operation in the electrical room. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of the spatial detection method of the temperature field of the inner wall of a movable electrical room in a polar environment of the present invention;

[0028] Figure 2 It is a schematic diagram of the establishment of the initial spatial rectangular coordinate system and the starting measurement position of the linear array infrared thermometer of the present invention;

[0029] Figure 3 This is a schematic diagram of a fixed measurement angle β0 of the temperature measuring probe of the present invention;

[0030] Figure 4 This is a schematic diagram of the horizontal rotation measurement range of the linear array infrared thermometer of the present invention;

[0031] Figure 5 A schematic diagram of the rotation of a linear infrared thermometer and the inversion of temperature and corresponding position information when the method of the present invention is used to measure the right inner wall (size L*H) of an electrical room;

[0032] Figure 6 A schematic diagram of the measurement position of the linear array infrared thermometer when the method of the present invention is used for the nth measurement;

[0033] Figure 7 A schematic diagram of the angle γ0 that the temperature measuring instrument needs to cover in the vertical direction used in the method of the present invention;

[0034] Figure 8 It is a schematic diagram of establishing a rectangular coordinate system according to the present invention for the measured size (W*H) of the inner wall. DETAILED DESCRIPTION

[0035] In order to better illustrate the content, features and effects of the present invention, an implementation method is given below with accompanying drawings for detailed description.

[0036] As shown in the accompanying drawings, the interior wall temperature field spatial detection method of the present invention comprises the following steps:

[0037] Step 1: Establish a three-dimensional rectangular coordinate system: Take the top wall of the rectangular electrical room as the xy plane and the center of the top wall as the coordinate origin to establish a three-dimensional rectangular coordinate system, where the y-axis is perpendicular to the right wall of the electrical room and the right direction is the positive direction, the x-axis is perpendicular to the y-axis and the forward direction is the positive direction, and the z-axis is perpendicular to the top wall and points to the room (such as Figure 2 ).

[0038] Step 2: Install the pan / tilt of the linear array infrared temperature measuring camera at the origin of the coordinates of the top wall of the electrical room and adjust the infrared rays emitted by the probe of the linear array infrared temperature measuring camera to form a vertical plane and form a vertical infrared line segment with a height of l on one side of the side wall to be measured, with the vertex located on the top wall. The upper end point of the vertical infrared line segment with a height of l is recorded as a0, and the lower end point is recorded as b0. The position corresponding to a0 is the highest point of the vertical infrared line segment, and b0 corresponds to the lowest point of the vertical infrared line segment. The upper end point and the lower end point are connected to the infrared emission point respectively, and the angle formed is β0.

[0039] The linear array infrared thermometer is an existing instrument, and its working principle is as follows: the infrared rays radiated at a fixed angle of β0 are collected by a convex lens on the side wall to be measured and converged into a vertical line with a height of l, and the temperature of the side wall at the corresponding position of the vertical line can be obtained at the same time (such as Figure 3 ), the pan / tilt drives the probe of the linear array infrared temperature measuring camera to rotate counterclockwise around the Z axis to form a measurement coverage of the entire space.

[0040] Step 3: Figure 4 As shown, the linear array infrared temperature camera rotates around the z-axis from θ0 to π-θ0 to measure the temperature of the side wall at a height of l, and stores the temperature data as an initial array (θ, β, T), where the rotation angle θ is the angle between the component of the infrared light projected by the temperature measuring probe on the xy plane and the positive semi-axis of the x-axis on the xy plane; β is the angle between the line connecting the lowest point of the vertical infrared line segment and the top center of the electrical room and the xy plane. The rotation angles θ and β mark the measured positions, T represents the temperature corresponding to the measured position, the initial value of θ is θ0, and the initial value of β is β0;

[0041] When measuring the left and right side walls in the y-axis direction, θ0 = arctan (W / L); when measuring the front and rear side walls in the x-axis direction, θ0 = arctan (L / W), where W is the width of the left and right side walls in the y-axis direction, and L is the width of the front and rear side walls in the x-axis direction;

[0042] Step 4: The linear array infrared temperature measuring camera determines whether n*β0<γ0, γ0=arctan(2H / W) is satisfied (e.g. Figure 7), n is the number of horizontal temperature measurements performed by the temperature measuring probe, where H is the height of the electrical room, and the β0 is the angle of the infrared light emitted by the probe. If yes, proceed to the next step, otherwise proceed to step seven;

[0043] Step 5: The pan-tilt head drives the probe to rotate downward around the x-axis at an angle β0, and then repeat step 3 to continue to measure the temperature from the bottom of the first measurement height downward and record the temperature data; all temperature data obtained for each line segment with a measured height of l are stored as a group of initial arrays, and each group of initial data corresponds to the measured line segment with a height of l.

[0044] Step 6, repeat steps 4 and 5 until the temperature of the side wall is measured and recorded;

[0045] Step 7: The pan / tilt drives the probe to rotate so that the infrared plane emitted by the probe is in the vertical plane and the vertex of the vertical line with a height of l formed on the next side wall to be measured is located on the top wall, and then repeat steps 3 to 7 until all four side wall temperatures are measured and the temperature data is stored. Due to the temperature measurement principle of the thermometer itself, the infrared rays are emitted through the lens, and the angle of each radiation is fixed at β0. However, due to the different angles of horizontal and vertical rotation of the thermometer, the actual temperature measurement range is different. Therefore, it is necessary to convert the obtained data and splice them to form the actual temperature distribution map of the measured inner wall, so as to help the actual project.

[0046] Step 8: After measuring the temperature field of the four side walls of the electrical room, perform temperature data conversion. The specific steps are as follows:

[0047] In the first step, since the infrared rays are emitted through the lens, the corresponding position of the temperature information received by the infrared rays is inverted with the position of the actual measurement point. Therefore, the data containing the temperature information and the corresponding position information measured on each line segment L corresponding to each set of initial data is mirrored with the horizontal midline of each line segment L as the symmetry axis to obtain an inverted line segment L. T , the upper endpoint of the inverted line segment is recorded as a, and the lower endpoint is recorded as b. The temperature data at a is the temperature data at b0, the temperature data at b is the temperature data at a0, and the data at other positions are inverted one by one. The angle between points a and b and the infrared emission point is still β0;

[0048] That is: invert all the temperature values ​​recorded in each initial array (θ, β, T), that is, the temperature value corresponding to the upper endpoint a0 of the infrared line segment with a height of l is the temperature value of the lower endpoint of the inverted infrared line segment, and the temperature value corresponding to the lower endpoint b0 is the temperature value of the upper endpoint of the inverted infrared line segment, forming an array (θ, β, T');

[0049] The second step is to invert the line segment L TDivide the line into k segments through k+1 points. k can be set according to actual needs. k is a positive integer. Each line segment l from point a, each dividing point to point b is marked as i1, i2, i3, ....i m 、i k+1 And record the temperature data corresponding to each point.

[0050] The third step is to measure the inner wall of the electrical room with a height of H and a width of L. Take the lower left corner of the inner wall of the electrical room as the origin, and establish a plane rectangular coordinate system o'-x'y' with the horizontal bottom edge and vertical side passing through each origin as the x' axis and y' axis respectively (such as Figure 8 ), where the x' axis is positive to the right; the y' axis is positive vertically upward. Create a transformation array (x', y', T'), where (x', y') represents the position coordinates of the measurement point, and T' represents the temperature data corresponding to the measurement point position (x', y'); the number of horizontal rotations of the thermometer to measure the temperature is n, and for each inverted line segment L T i on m The relationship between the point and the transformation array (x', y', T') is as follows, where m = 1, 2, 3, 4..... k, k+1:

[0051] When θ∈[arctan(W / L),π / 2): i m The coordinates (x',y') of the point are:

[0052] (W / (2tanθ)+L / 2,H-tan[(n-1)β0]*W / (2sinθ)-{tan(nβ0)-tan[(n-1)β0]}*(W / (2sinθ))*(m-1) / k)

[0053] When θ=π / 2: i m The coordinates (x',y') of the point are:

[0054] (L / 2,H-tan[(n-1)β0]*W / (2sinθ)-{tan(nβ0)-tan[(n-1)β0]}*(W / (2sinθ))*(m-1) / k)

[0055] When θ∈(π / 2,π-arctan(W / L)]: i m The coordinates (x',y') of the point are:

[0056] (L / 2-W / [2tan(π-θ)],H-tan[(n-1)β0]*W / (2sinθ)-{tan(nβ0)-tan[(n-1)β0]}*(W / (2sinθ))*(m-1) / k)

[0057] The fourth step is to transform the inverted line segments L T Delete the points that do not satisfy x'∈[0,L],y'∈[0,H];

[0058] This is because the temperature measurement principle determines that when the thermometer rotates horizontally, part of it will radiate to the floor of the electrical room. Therefore, in the plane rectangular coordinate system established for the measured inner wall, a point containing temperature data will appear below the x' axis in the transformed coordinate system. The temperature of this part does not belong to the inner wall. Therefore, after the thermometer completes the conversion of all coordinate data containing temperature, only the rectangular area x'∈[0,L],y'∈[0,H] should be retained in the rectangular coordinate system, and the rest should be deleted.

[0059] Step 9. The thermometer outputs the temperature data corresponding to each coordinate in each retained rectangular area to the computer and imports it into MATLAB for data processing. Each temperature data is compared with the standard color card to obtain the color corresponding to the temperature value, and then a color distribution map corresponding to the temperature of each point on the inner wall of the electrical room is obtained.

Claims

1. A spatial detection method for the temperature field of the inner wall of a mobile electrical room in a polar environment, characterized in that The following steps are involved: Step 1: Establish a three-dimensional rectangular coordinate system with the top wall of the rectangular electrical room as the xy plane and the center of the top wall as the coordinate origin, where the y-axis is perpendicular to the right wall of the electrical room and the right direction is the positive direction, the x-axis is perpendicular to the y-axis and the forward direction is the positive direction, and the z-axis is perpendicular to the top wall and points into the room; Step 2, install the pan / tilt of the linear array infrared temperature measuring camera at the coordinate origin of the top wall of the electrical room and adjust the infrared rays emitted by the probe of the linear array infrared temperature measuring camera to form a vertical plane and form a vertical infrared line segment with a height of l on one side of the side wall to be measured, the vertex of which is located on the top wall, the upper end point of the infrared line segment with a height of l is recorded as a0, and the lower end point is recorded as b0; the upper end point and the lower end point are respectively connected to the infrared emission point, and the angle formed is β0; Step 3, the linear array infrared temperature measuring camera rotates around the z-axis from θ0 to π-θ0 to measure the temperature of the side wall at a height of l, and stores the temperature data as an initial array (θ, β, T), wherein the rotation angle θ is the angle between the component of the infrared light projected by the temperature measuring probe on the xy plane and the positive semi-axis of the x-axis on the xy plane; β is the angle between the line connecting the lowest point of the vertical infrared line segment and the top center of the electrical room and the xy plane, the rotation angles θ and β mark the measured positions, T represents the temperature corresponding to the measured position, the initial value of θ is θ0, and the initial value of β is β0; When measuring the left and right side walls in the y-axis direction, θ0 = arctan (W / L); when measuring the front and rear side walls in the x-axis direction, θ0 = arctan (L / W), where W is the width of the left and right side walls in the y-axis direction, and L is the width of the front and rear side walls in the x-axis direction; Step 4: The linear array infrared temperature measuring camera determines whether n*β0<γ0, γ0=arctan(2H / W), n is the number of horizontal temperature measurements performed by the temperature measuring probe, and H is the height of the inner wall of the measured electrical room; if yes, proceed to the next step, otherwise proceed to step 7; Step 5: The pan-tilt head drives the probe to rotate downward around the x-axis by an angle β0, and then repeats step 3 to continue to measure the temperature from the bottom of the first measurement height downward and record the temperature data; all temperature data obtained for each line segment with a measurement height of l are stored as a set of initial arrays; Step 6, repeat steps 4 and 5 until the temperature of the side wall is measured and recorded; Step 7: The pan / tilt drives the probe to rotate so that the infrared plane emitted by the probe is in a vertical plane and the vertex of a vertical line with a height of l formed on the next side wall to be measured is located on the top wall, and then steps 3 to 7 are repeated until all four side wall temperatures are measured and the temperature data are stored; Step 8: After measuring the temperature field of the four side walls of the electrical room, perform temperature data conversion. The specific steps are as follows: In the first step, the data containing temperature information and corresponding position information measured on each line segment L corresponding to each set of initial data are mirrored with the horizontal midline of each line segment L as the symmetry axis to obtain an inverted line segment L. T , the upper endpoint of the inverted line segment is recorded as a, and the lower endpoint is recorded as b; the temperature data at a is the temperature data at b0, the temperature data at b is the temperature data at a0, and the data at other positions are inverted one by one; the angle formed by connecting points a and b with the infrared emission point is still β0; The second step is to invert the line segment L T Divide the line into k segments through k+1 points, k is a positive integer, and record each line segment l from point a, each dividing point to point b as i1, i2, i3, ....i m .、i k+1 , and record the temperature data corresponding to each point; The third step is to measure the inner wall of the electrical room with a height of H and a width of L. Take the lower left corner of the inner wall of the electrical room as the origin, and establish a plane rectangular coordinate system o'-x'y' with the horizontal bottom edge and vertical side passing through each origin as the x' axis and y' axis, where the x' axis is positive to the right; the y' axis is positive vertically upward; establish a conversion array (x', y', T'), where (x', y') represents the position coordinates of the measuring point, and T' represents the temperature data corresponding to the measuring point position (x', y'); the number of horizontal rotations of the thermometer to measure the temperature is n, and for each inverted line segment L T i on m The relationship between the point and the transformation array (x', y', T') is as follows, where m = 1, 2, 3, 4..... k, k+1: When θ∈[arctan(L / W),π / 2): i m The coordinates (x',y') of the point are: (W / (2tanθ)+L / 2,H-tan[(n-1)β0]*W / (2sinθ)-{tan(nβ0)-tan[(n-1)β0]}*(W / (2sinθ))*(m-1) / k) When θ=π / 2: i m The coordinates (x',y') of the point are: (L / 2,H-tan[(n-1)β0]*W / (2sinθ)-{tan(nβ0)-tan[(n-1)β0]}*(W / (2sinθ))*(m-1) / k) When θ∈(π / 2,π-arctan(L / W)]: i m The coordinates (x',y') of the point are: (L / 2-W / [2tan(π-θ)],H-tan[(n-1)β0]*W / (2sinθ)-{tan(nβ0)-tan[(n-1)β0]}*(W / (2sinθ))*(m-1) / k) The fourth step is to transform the inverted line segments L T Delete the points that do not satisfy x'∈[0,L],y'∈[0,H]; Step 9. The thermometer outputs the temperature data corresponding to each coordinate in each retained rectangular area to the computer and imports it into MATLAB for data processing. Each temperature data is compared with the standard color card to obtain the color corresponding to the temperature value, and then a color distribution map corresponding to the temperature of each point on the inner wall of the electrical room is obtained.

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