阅读说明：本技术 一种测量电力设备漏油面积的方法 (Method for measuring oil leakage area of power equipment ) 是由 青言 杨宏伟 彭兆裕 黎慧明 张志磊 孙再超 罗康顺 王韧 李佑明 刘冲 于 2019-09-18 设计创作，主要内容包括：本申请涉及电力设备检修技术领域,尤其涉及一种测量电力设备漏油面积的方法。所述方法包括：终端的主镜头获取漏油面的图像信息,图像信息为漏油面在所述终端传感器上的投影面信息；终端的tof镜头获取距离信息,距离信息包括第一距离信息和第二距离信息,第一距离信息为漏油面到所述终端的距离,第二距离信息为漏油面在传感器上的投影面到终端tof镜头的距离；根据图像信息、距离信息以及时间信息进行三维重构,得到实际漏油面积。本申请使用的方法通过计算漏油面的深度信息和角度信息从而可以矫正主摄像头成像时带来的透视误差,获得更加准确的面积信息。(The application relates to the technical field of electric power equipment maintenance, in particular to a method for measuring oil leakage area of electric power equipment. The method comprises the following steps: the method comprises the steps that a main lens of a terminal obtains image information of an oil leakage surface, wherein the image information is projection surface information of the oil leakage surface on a terminal sensor; the method comprises the steps that a tof lens of a terminal obtains distance information, wherein the distance information comprises first distance information and second distance information, the first distance information is the distance from an oil leakage surface to the terminal, and the second distance information is the distance from a projection surface of the oil leakage surface on a sensor to the tof lens of the terminal; and performing three-dimensional reconstruction according to the image information, the distance information and the time information to obtain the actual oil leakage area. According to the method, the perspective error caused by imaging of the main camera can be corrected by calculating the depth information and the angle information of the oil leakage surface, and more accurate area information is obtained.)

1. A method for measuring an oil leakage area of electric power equipment, applied to a terminal (1), is characterized by comprising:

acquiring image information of an oil leakage surface (6), wherein the image information is projection surface information of the oil leakage surface (6) on the terminal;

obtaining distance information, wherein the distance information is the distance from the oil leakage surface (6) to the terminal;

and performing three-dimensional reconstruction according to the image information and the distance information to obtain the actual oil leakage area.

2. The method for measuring the oil leakage area of the electric power equipment according to claim 1, wherein the oil leakage surface (6) is the oil leakage surface (6) irradiated by the ultraviolet light source (5).

3. The method for measuring an oil leakage area of an electric power equipment according to claim 1, wherein before obtaining the image information of the oil leakage level (6), the method further comprises placing the terminal (1) at a preset position.

4. The method for measuring the oil leakage area of the electric power equipment according to claim 1, wherein after obtaining the image information of the oil leakage surface (6), the method further comprises preprocessing the image information.

5. The method for measuring oil leakage area of electric power equipment according to claim 1, wherein the three-dimensional reconstruction comprises:

determining the coordinates of the tof lens as (a, b and c) by taking the center of the sensor as a coordinate origin (0,0 and 0) and taking the plane where the sensor is positioned as the plane where the X axis and the Y axis are positioned;

obtaining a first plane on the oil leakage surface (6), and taking three non-collinear points A, B, C on the first plane;

calculating a coordinate value A, B, C according to the direction vector of the incident light corresponding to A, B, C and the coordinates (a, b, c) of the tof lens;

setting the first plane equation to be Ux + Vy + Wz + D as 0, substituting coordinates of three points A, B, C into the plane equation of the first plane to obtain a normal vector of the first plane as

According to the normal vector of the terminal sensor planeAndcalculating the cosine value of the included angle between the first plane and the plane where the sensor is located

Dividing the projection plane into a plurality of sub-pixels, and taking one sub-pixel M, wherein the center coordinate of M is (x)_a，y_a，0)；

According to the imaging principle, an imaging light path is equivalent to an aperture imaging light path, and the coordinates of aperture points imaged by the apertures are Q₁(0，0，z₁)；

Let four vertices of M be M₁、M₂、M₃、M₄Then M is₁、M₂、M₃、M₄The points are respectively connected with Q₁The connecting line is the backlight path of the M imaging, and the M is connected₁Q₁、M₂Q₁、M₃Q₁、M₄Q₁Then straight line M₁Q₁、M₂Q₁、M₃Q₁、M₄Q₁The quadrilateral defined by the intersection with the first plane Ux + Vy + Wz + D equal to 0 is N₁N₂N₃N₄；

According toTo separate out N₁Can be solved to obtain N₂N₃N₄The coordinate values of (a);

will quadrangle N₁N₂N₃N₄Projecting to the Z axis of the plane of the sensor to obtain a quadrangle P₁P₂P₃P₄；

According toTo obtain a quadrilateral N₁N₂N₃N₄The area of (d);

according to S_P1P2P3P4＝S_N1N2N3N4COS theta to get quadrilateral P₁P₂P₃P₄The area of (d);

according toi∈[1…n]And n is more than or equal to 1, the area of the oil leakage surface (6) is obtained by calculation, wherein the actual area corresponding to the sub-pixel M is S_M＝S_P1P2P3P4The actual area of all sub-pixels is set T ═ S (S)₁，S₂，……S_n)，S_M∈T。

6. A terminal, characterized in that the terminal (1) comprises a housing and an inner member, which is arranged inside the housing and is electrically connected to the housing,

the shell is further provided with a main lens (2), a tof lens (3) and a laser emitter (4), the main lens (2) is used for obtaining image information of an oil leakage surface (6), the tof lens (3) is used for obtaining distance information, and the laser emitter (4) is used for emitting laser to the oil leakage surface (6);

the inner member is provided with a sensor, and the sensor is used for acquiring a projection surface.

7. The terminal according to claim 6, wherein a display screen is further disposed on the housing, and the display screen is used for displaying the image information, the distance information and the oil leakage area.

Technical Field

The application relates to the technical field of electric power equipment maintenance, in particular to a method for measuring oil leakage area of electric power equipment.

Background

The insulating medium filled in large-scale power equipment mainly comprises sulfur hexafluoride gas and naphthenic base insulating oil, the most of the insulating medium is filled in insulating oil, and besides the widely existing oil-filled power equipment, oil-immersed TA, oil-immersed TV, oil-immersed reactors and the like are also available. The oil leakage of oil-filled power equipment is a very common problem, the oil leakage speed is an important index for judging the oil leakage degree, and the oil leakage area is also an important index for reflecting the oil leakage speed.

The existing method for judging the oil leakage degree is to arrange a timer at a place where oil leakage is found, observe the oil dripping through naked eyes, reflect the oil dripping condition in unit time or a preset time period through the timer, and cannot judge the oil leakage degree through measuring the oil leakage area.

However, the method for determining the oil leakage degree by using the artificial observation method has a large error, and cannot provide accurate data support for actual production activities, so that a method for accurately measuring the oil leakage area of the power equipment is urgently needed.

Disclosure of Invention

The application provides a method for measuring oil leakage area of electric power equipment, which aims to solve the problem that the oil leakage degree is judged inaccurately at present.

The first aspect of the application provides a method for measuring oil leakage area of electric power equipment, which is applied to a terminal, and the method comprises the following steps:

acquiring image information of an oil leakage surface, wherein the image information is projection surface information of the oil leakage surface on the terminal;

obtaining distance information, wherein the distance information is the distance from the oil leakage surface to the terminal;

and performing three-dimensional reconstruction according to the image information and the distance information to obtain the actual oil leakage area.

Optionally, the oil leakage surface is irradiated by an ultraviolet light source.

Optionally, before acquiring the image information of the oil leakage surface, the method further includes placing the terminal at a preset position.

Optionally, after acquiring the image information of the oil leakage surface, the method further includes preprocessing the image information.

Optionally, the three-dimensional reconstruction includes:

determining the coordinates of the tof lens as (a, b and c) by taking the center of the sensor as a coordinate origin (0,0 and 0) and taking the plane where the sensor is positioned as the plane where the X axis and the Y axis are positioned;

obtaining a first plane on the oil leakage surface (6), and taking three non-collinear points A, B, C on the first plane;

calculating a coordinate value A, B, C according to the direction vector of the incident light corresponding to A, B, C and the coordinates (a, b, c) of the tof lens;

setting the first plane equation to be Ux + Vy + Wz + D as 0, substituting coordinates of three points A, B, C into the plane equation of the first plane to obtain a normal vector of the first plane as

According to the normal vector of the terminal sensor planeAndcalculating the cosine value of the included angle between the first plane and the plane where the sensor is located

Dividing the projection plane into a plurality of sub-pixels, and taking one sub-pixel M, wherein the center coordinate of M is (x)_a，y_a，0)；

According to the imaging principle, an imaging light path is equivalent to an aperture imaging light path, and the coordinates of aperture points imaged by the apertures are Q₁(0，0，z₁)；

Let four vertices of M be M₁、M₂、M₃、M₄Then M is₁、M₂、M₃、M₄The points are respectively connected with Q₁The connecting line is the backlight path of the M imaging, and the M is connected₁Q₁、M₂Q₁、M₃Q₁、M₄Q₁Then straight line M₁Q₁、M₂Q₁、M₃Q₁、M₄Q₁The quadrilateral defined by the intersection with the first plane Ux + Vy + Wz + D equal to 0 is N₁N₂N₃N₄；

According toTo separate out N₁Can be solved to obtain N₂N₃N₄The coordinate values of (a);

will quadrangle N₁N₂N₃N₄Projecting to the Z axis of the plane of the sensor to obtain a quadrangle P₁P₂P₃P₄；

According toTo obtain a quadrilateral N₁N₂N₃N₄The area of (d);

according to S_P1P2P3P4＝S_N1N2N3N4COS theta to get quadrilateral P₁P₂P₃P₄The area of (d);

according toCalculating to obtain the area of the oil leakage surface, wherein the actual area corresponding to the sub-pixel M is S_M＝S_P1P2P3P4The actual area of all sub-pixels is set T ═ S (S)₁，S₂，……S_n)，S_M∈T。

A second aspect of the present application provides a terminal comprising a housing and an inner member disposed inside the housing in electrical connection with the housing,

the shell is further provided with a main lens, a tof lens and a laser emitter, wherein the main lens is used for acquiring image information of an oil leakage surface, the tof lens is used for acquiring distance information, and the laser emitter is used for emitting laser to the oil leakage surface;

optionally, a display screen is further disposed on the housing, and the display screen is configured to display the image information, the distance information, and the oil leakage area.

The technical scheme provided by the application comprises the following beneficial technical effects:

the application provides a method for measuring oil leakage area of electric power equipment, which is applied to a terminal and comprises the following steps: the method comprises the steps that a main lens of a terminal obtains image information of an oil leakage surface, wherein the image information is projection surface information of the oil leakage surface on a terminal sensor; a tof lens of the terminal acquires distance information, wherein the distance information is the distance from an oil leakage surface to the terminal; and performing three-dimensional reconstruction according to the image information and the distance information to obtain the actual oil leakage area. According to the method, the perspective error caused by imaging of the main camera can be corrected by calculating the depth information and the angle information of the oil leakage surface, and more accurate area information is obtained.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.

Fig. 1 is a flowchart of a method for measuring an oil leakage area of an electrical device according to an embodiment of the present application.

Fig. 2 is an application scenario diagram of a method for measuring an oil leakage area of an electrical device according to an embodiment of the present application.

Fig. 3 is a projection plane of an oil leakage surface provided in an embodiment of the present application.

Fig. 4 is a schematic diagram of a method for calculating an actual area corresponding to a unit pixel in a method for measuring an oil leakage area of an electrical device according to an embodiment of the present application.

Description of reference numerals:

1. a terminal; 2. a main lens; 3. a tof lens; 4. a laser transmitter; 5. an ultraviolet light source; 6. and (5) oil leakage surface.

Detailed Description

Illustratively, as shown in fig. 1, a first aspect of the present application provides a method for measuring an oil leakage area 6 of an electrical device, which is applied to a terminal 1, and the method includes:

s1: image information of the oil leakage surface 6 is acquired.

The image information is obtained, in fact, in order to obtain the projection of the real oil leaking surface 6 on the terminal 1, the actual projection area is converted according to the projection area, in the present application, the main camera on the terminal 1 is used to obtain the image information of the oil leaking surface 6, and the real oil leaking area is obtained through the subsequent three-dimensional reconstruction.

Optionally, the oil leakage surface 6 is the oil leakage surface 6 irradiated by the ultraviolet light source 5. At present, experiments show that the naphthenic base insulating oil can generate a fluorescence effect under the irradiation of ultraviolet rays, and the oil leakage area of the insulating oil can be identified by detecting an image of the fluorescence generated by the insulating oil, so before the area of the oil leakage surface 6 is measured and calculated, firstly, the oil leakage surface 6 is irradiated by an ultraviolet light source 5, and the oil leakage surface 6 irradiated by the ultraviolet light source 5 can emit fluorescence, thereby facilitating the identification of the terminal 1.

Optionally, before acquiring the image information of the oil leakage surface 6, the method further includes placing the terminal 1 at a preset position. When the terminal 1 irradiates the oil leakage surface 6, firstly, components used for acquiring image information, distance information and emitting laser in the terminal 1 are required to be aligned to the oil leakage surface 6, so that the position of the terminal 1 is preferably selected to be right above the oil leakage surface 6, and the acquired data can be accurate.

Optionally, after acquiring the image information of the oil leakage surface 6, the method further includes preprocessing the image information.

The image processing technology is a relatively mature technology at present, and is not described in detail here.

S2: and acquiring distance information.

Distance information in this application does oil leakage level 6 reaches terminal 1's distance L, L is obtained by tof camera lens 3.

S3: and performing three-dimensional reconstruction according to the image information and the distance information to obtain 6 areas of the actual oil leakage area.

Optionally, the three-dimensional reconstruction includes:

q1: and acquiring a first plane on the oil leakage surface 6, and calculating an included angle between the first plane and the oil leakage surface 6 according to a plane equation of the first plane.

Specifically, the method comprises the following steps: the coordinates of the tof lens 3 are determined to be (a, b, c) with the center of the sensor as the origin of coordinates (0,0,0) and the plane on which the sensor is located as the plane on which the X and Y axes are located.

Taking three non-collinear points on the first plane, A, B, C respectively, wherein the coordinate of the point A is (a)₁,b₁,c₁) The coordinate of the point B is (a)₂,b₂,c₂) The coordinate of the point C is (a)₃,b₃,c₃) The direction vector of the incident light corresponding to A point isThe direction vector of the incident light corresponding to B point isThe direction vector of the incident light corresponding to the C point is

According to the coordinates (a, b, c), L and of the tof lens 3The coordinate values of A, B, C are respectively calculated, and the specific formula is as follows:

the coordinates of point a are:

the coordinates of point B are:

the coordinates of point C are:

through the above calculation, coordinates of three points on the first plane can be calculated, and assuming that the first plane equation is 0 of Ux + Vy + Wz + D, the coordinates of A, B, C points are substituted into the plane equation of the first plane to obtain a value of U, V, W, D. U, V, W, D, the normal vector of the first plane is known asAnd the normal vector of the sensor plane with said terminal 1 isAccording toAndand calculating a cosine value of an included angle between the first plane and the plane where the sensor is located, namely obtaining the cosine value of the included angle between the oil leakage surface 6 and the plane where the sensor is located, and converting the area of the solved oil leakage surface 6 into the area of a vertical projection surface of the solved oil leakage surface 6 on the sensor.

The specific formula is as follows:

q2: and calculating the area of the sub-pixels on the plane of the sensor, and calculating the actual oil leakage area by taking the sum of the actual areas reduced by the sub-pixels of the sensor as the actual oil leakage area.

Exemplarily, as shown in fig. 4, the specific steps are as follows: to leak oil from the surface 6The projection surface is divided into a plurality of point sets to form a plurality of sub-pixels, and the set forms an image of the oil leakage surface 6 as shown in figure 3. A sub-pixel M identified on the sensor as an image of the oil leakage, where M has a center coordinate of (x)_a，y_aAnd 0), determining the point M, and enabling an imaging light path to be equivalent to a pinhole imaging light path according to the imaging principle. The coordinate of the pinhole point of the pinhole imaging is Q₁(0，0，z₁)

The length of the sub-pixel M is x₀Width of y₀Then the coordinates of the four vertexes of the sub-pixels are M₁(x_a+0.5x₀，y_a+0.5y₀，0)、M₂(x_a+0.5x₀，y_a-0.5y₀，0)、M₃(x_a-0.5x₀，y_a-0.5y₀，0)、M₄(x_a-0.5x₀，y_a+0.5y₀，0)。

Then M₁、M₂、M₃、M₄The points are respectively connected with Q₁The connecting line is the back light path of the sub-pixel imaging, and the straight line M₁Q₁、M₂Q₁、M₃Q₁、M₄Q₁Quadrilateral N established by the intersection with the first plane Ux + Vy + Wz + D equal to 0₁N₂N₃N₄I.e. the original shape of the sub-pixel. Can calculate to obtain M₁Q₁The intersection point with the first plane is N₁(x_b1，y_b1，z_b1)、M₂Q₁The intersection point with the first plane is N₂(x_b2，y_b2，z_b2)，M₃Q₁The intersection point with the first plane is N₃(x_b3，y_b3，z_b3)、M₄Q₁The intersection point with the first plane is N₄(x_b4，y_b4，z_b4)。

Straight line M₁Q has the equation of

According toCan solve out N₁The coordinates of (a);

in the same way, according toCan solve out N₂The coordinates of (a);

according toCan solve out N₃The coordinates of (a);

according toCan solve out N₄The coordinates of (a);

quadrilateral N₁N₂N₃N₄The Z-axis projection of the plane where the sensor is positioned is a quadrangle P₁P₂P₃P₄Then P is₁(x_b1，y_b1，0)，P₂(x_b2，y_b2，0)，P₃(x_b3，y_b3，0),P₄(x_b4，y_b4，0)。

Then there is S_P1P2P3P4＝COSθS_N1N2N3N4，

While

The actual area corresponding to the pixel point is

The total oil leakage area is the sum of the actual areas of all the sub-pixels, so that the total oil leakage area is determined according to the sumn is more than or equal to 1, and the area of the oil leakage surface 6 is obtained through calculation, wherein the actual area corresponding to the sub-pixel M is S_M＝S_P1P2P3P4The actual area of all sub-pixels is set T ═ S (S)₁，S₂，……S_n)，S_M∈T。

Illustratively, as shown in fig. 2, a second aspect of the present application provides a terminal 1, where the terminal 1 includes a housing and an inner member, and the inner member is disposed inside the housing and electrically connected with the housing.

The shell is further provided with a main lens 2, a tof lens 3 and a laser emitter 4, wherein the main lens 2 is used for acquiring image information of an oil leakage surface 6, the tof lens 3 is used for acquiring distance information, and the laser emitter 4 is used for emitting laser to the oil leakage surface 6;

optionally, a display screen is further disposed on the housing, and the display screen is configured to display the image information, the distance information, and the oil leakage area.

Optionally, the terminal 1 is a smart phone, a tablet personal computer or other portable handheld terminals, the portable handheld terminal is selected for use because of convenient carrying, too much manpower and material resources do not need to be consumed in the test, the collected data can be uploaded in time, and the result obtained after calculation is displayed to facilitate checking.

The application provides a method for measuring oil leakage area of electric power equipment, which is applied to a terminal and comprises the following steps: the method comprises the steps that a main lens of a terminal obtains image information of an oil leakage surface, wherein the image information is projection surface information of the oil leakage surface on a terminal sensor; a tof lens of the terminal acquires distance information, wherein the distance information is the distance from an oil leakage surface to the terminal; and performing three-dimensional reconstruction according to the image information and the distance information to obtain the actual oil leakage area. According to the method, the perspective error caused by imaging of the main camera can be corrected by calculating the depth information and the angle information of the oil leakage surface, and more accurate area information is obtained.

It is to be noted that terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

It will be understood that the present application is not limited to what has been described above and shown in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.