Heliostat adjusting mechanism and heliostat adjusting method

Abstract

The application provides a heliostat adjusting mechanism and a heliostat adjusting method. The adjusting mechanism comprises an optical detection module, which comprises a light source component capable of emitting linear light, an f theta lens and an image acquisition component. The adjusting method comprises the following steps: S1. installing the optical detection module above a sub-mirror of a heliostat to be adjusted, and then adjusting the position of the optical detection module, so that the linear light emitted by the light source component is irradiated onto the sub-mirror to be adjusted along a predetermined direction, the linear light is further projected onto the image plane of the image acquisition component after being reflected by the sub-mirror to be adjusted, and a detection light spot is formed on the image plane of the image acquisition component; S2. determining the position of an ideal light spot of the linear light on the image plane of the image acquisition component when the normal position of the sub-mirror to be adjusted is located at an ideal normal position; and S3. adjusting the sub-mirror to be adjusted until the position of the detection light spot coincides with the position of the ideal light spot. The application can conveniently and efficiently detect and adjust the surface shape of the heliostat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heliostat adjustment, and in particular to a heliostat adjustment mechanism and a heliostat adjustment method. BACKGROUND

[0002] A heliostat is a kind of solar concentrator, which is mainly applied in a tower type solar thermal power station. The heliostat usually comprises a plurality of sub-mirrors. In order to achieve a high concentration efficiency, the optical surface shape of the heliostat is detected, and then the angle of the sub-mirror is adjusted according to the detection result until the heliostat reaches an ideal optical surface shape.

[0003] The detection methods of the optical surface shape of the heliostat mainly include a laser scanning method, a photogrammetry method and a fringe reflection method. The laser scanning method firstly scans the mirror surface by a laser beam, and the normal direction is obtained from the position of the reflected light. The normal deviation obtained by this method has high accuracy, but the detection time is long. The photogrammetry method is to paste special mark points on the measured mirror surface, and then take pictures of the mirror surface at different angles by using a camera, and the spatial three-dimensional coordinates of the measured points are determined by the collinearity principle. This method is suitable for the detection of any surface shape and has high accuracy, and is applied more in the measurement of the heliostat accuracy. However, the installation and calibration of a large number of mark points is a very time-consuming work, so it is not suitable for rapid detection. The fringe reflection method is to project black and white stripes on the screen, and then use a camera to shoot the image of the reflected stripes by the measured mirror. The stripes are modulated by the surface shape of the measured mirror, and the surface shape error distribution can be obtained through phase shift algorithm and image processing. In practical application, some mechanical measurement methods are also used, for example, an inclinometer is directly used to measure the angles of two sub-mirrors, so as to guide the adjustment work. However, this method requires that the curvature of the mirror surface cannot be too large, and the operation process is complicated and time-consuming.

[0004] Therefore, how to conveniently and efficiently detect and adjust the surface shape of the heliostat is a technical problem to be solved by those skilled in the art. SUMMARY

[0005] To solve the above technical problem, the present application provides a heliostat adjustment mechanism, which comprises an optical detection module, the optical detection module comprises a light source component capable of emitting linear light, an fθ lens and an image acquisition component. In use, the linear light emitted by the light source component is irradiated onto the sub-mirror of the heliostat to be adjusted along a predetermined direction, the linear light is further projected onto the image plane of the image acquisition component after being reflected by the sub-mirror to be adjusted and the fθ lens, and a detection light spot is formed on the image plane of the image acquisition component.

[0006] In one embodiment of the heliostat adjustment mechanism, the optical detection module further comprises a reflection component. In use, the linear light is reflected onto the fθ lens by the reflection surface of the reflection component after being reflected by the sub-mirror to be adjusted.

[0007] An embodiment of the heliostat adjusting mechanism, the reflecting component is a half-reflecting half-transmitting prism, the half-reflecting half-transmitting prism is arranged below the light source component, in use, the linear light is emitted from the light source component and irradiated to the sub-mirror to be adjusted through the half-reflecting half-transmitting prism.

[0008] An embodiment of the heliostat adjusting mechanism, the light source component is a laser.

[0009] An embodiment of the heliostat adjusting mechanism, the image acquisition component is a CMOS camera.

[0010] An embodiment of the heliostat adjusting mechanism, the heliostat adjusting mechanism comprises a support module, in use, the optical detection module is fixed on the support module.

[0011] The application also provides a heliostat adjusting method, which is realized based on the heliostat adjusting mechanism according to any one of the above embodiments, and comprises the following steps:

[0012] S1. Installing the optical detection module above the sub-mirror of the heliostat to be adjusted, and then adjusting the position of the optical detection module, so that the linear light emitted by the light source component is irradiated to the sub-mirror to be adjusted along a predetermined direction, the linear light is further projected to the image plane of the image acquisition component through the fθ lens after being reflected by the sub-mirror to be adjusted, and a detection light spot is formed on the image plane of the image acquisition component.

[0013] S2. According to the ideal normal line position of the sub-mirror to be adjusted and the adjusted position of the optical detection module, the position of the ideal light spot of the linear light on the image plane of the image acquisition component is determined when the normal line position of the sub-mirror to be adjusted is located at the ideal normal line position.

[0014] S3. Adjusting the sub-mirror to be adjusted until the position of the detection light spot coincides with the position of the ideal light spot.

[0015] An embodiment of the heliostat adjusting method, the optical detection module further comprises a reflecting component, when adjusting the position of the optical detection module, first, the positions of the fθ lens, the image acquisition component and the reflecting component are adjusted, so that the optical axis of the fθ lens is horizontal, the center point of the image plane of the image acquisition component and the focal point of the fθ lens are located on a horizontal line, and the included angle between the reflecting surface of the reflecting component and the horizontal plane is 45 degrees, and then the position of the light source component is adjusted, so that the linear light emitted by the light source component is vertically downward irradiated to the sub-mirror to be adjusted.

[0016] One embodiment of the heliostat adjustment method adjusts the position of the light source component by arranging a horizontal reflecting surface below the light source component, making the linear light emitted by the light source component reflect on the reflecting surface of the reflecting component in turn after reflecting on the horizontal reflecting surface, and then forming a light spot on the image plane of the image acquisition component through the fθ lens, and adjusting the angle of the light source component according to the position of the light spot until the position of the light spot is located at the center point of the image plane of the image acquisition component.

[0017] One embodiment of the heliostat adjustment method installs an optical detection module above the center point of the sub-mirror to be adjusted, so that the linear light emitted by the light source component irradiates on the center point of the sub-mirror to be adjusted, and / or installs several optical detection modules above the edge region of the sub-mirror to be adjusted, so that the linear light emitted by the light source component irradiates on the edge region of the sub-mirror to be adjusted.

[0018] The heliostat adjustment mechanism provided by the present application has a simple structure, and the heliostat adjustment method implemented based on the heliostat adjustment mechanism is easy to implement, which can conveniently and efficiently detect and adjust the surface shape of the heliostat. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a schematic diagram of one embodiment of the heliostat adjustment mechanism provided by the present application adjusting a rectangular heliostat.

[0020] Figure 2 FIG. 2 is a schematic diagram of a single optical detection module in FIG. 1. Figure 1

[0021] Figure 3 FIG. 3 is a schematic diagram of an adjustment mode of the light source component in FIG. 2.

[0022] Figure 4 FIG. 4 is a schematic diagram of another adjustment mode of the light source component in FIG. 2. Figure 5 FIG. 5 is a schematic diagram of two heliostats with different shapes.

[0023] The following is a description of the reference signs:

[0024] 10 optical detection module, 101 light source component, 102 fθ lens, 103 reflecting component, 104 image acquisition component;

[0025] 20 support module, 201 bracket, 202 gantry;

[0026] 30 heliostat, 301 sub-mirror;

[0027] 40 horizontal reflecting surface. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments. ​

[0029] The application provides a heliostat adjusting mechanism and a heliostat adjusting method.

[0030] As shown in Figure 1 The application provides a heliostat adjusting mechanism, which comprises an optical detection module 10.

[0031] As shown in Figure 2 The optical detection module 10 comprises a light source component 101 capable of emitting linear light, an fθ lens 102 and an image acquisition component 104. In use, the linear light emitted by the light source component 101 is irradiated onto a sub-mirror 301 of a heliostat 30 to be adjusted along a predetermined direction, the linear light is further projected onto an image plane of the image acquisition component 104 after being reflected by the sub-mirror 301 to be adjusted and the fθ lens 102, and a detection light spot is formed on the image plane of the image acquisition component 104.

[0032] The application provides a heliostat adjusting method, which is realized based on the heliostat adjusting mechanism provided by the application. The heliostat adjusting method comprises the following steps:

[0033] S1. An optical detection module 10 is installed above a sub-mirror 301 of a heliostat 30 to be adjusted, and then the position of the optical detection module 10 is adjusted so that the linear light emitted by the light source component 101 is irradiated onto the sub-mirror 301 to be adjusted along a predetermined direction, the linear light is further projected onto an image plane of the image acquisition component 104 after being reflected by the sub-mirror 301 to be adjusted and the fθ lens 102, and a detection light spot is formed on the image plane of the image acquisition component 104.

[0034] More specifically, one or more optical detection modules 10 are installed above each sub-mirror 301 of the heliostat 30.

[0035] When only one optical detection module 10 is installed above a single sub-mirror 301, the optical detection module 10 can be installed above the center point of the sub-mirror 301, so that the linear light emitted by the light source component 101 of the optical detection module 10 is irradiated onto the center point of the corresponding sub-mirror 301.

[0036] When multiple optical detection modules 10 are installed above a single sub-mirror 301, the optical detection modules 10 can be all installed above the edge region of the corresponding sub-mirror 301, so that the linear light emitted by the light source component 101 of the optical detection modules 10 is irradiated onto the edge region of the sub-mirror 301 to be adjusted, or one of the optical detection modules 10 can be installed above the center point of the sub-mirror 301, so that the linear light emitted by the light source component 101 of the optical detection module 10 is irradiated onto the center point of the sub-mirror 301 to be adjusted.

[0037] S2. According to the ideal normal position of the to-be-adjusted sub-mirror 301 and the adjusted position of the optical detection module 10, the position of the ideal light spot of the linear light on the image plane of the image acquisition component 104 is determined when the normal position of the to-be-adjusted sub-mirror 301 is at the ideal normal position.

[0038] More specifically, after the position of the optical detection module 10 is adjusted, the incident angle of the linear light emitted by the light source component 101 relative to the ideal sub-mirror 301 (the to-be-adjusted sub-mirror 301 when the normal position is at the ideal normal position) can be determined, and then the exit angle of the linear light relative to the ideal sub-mirror 301 can be determined, and then the incident angle of the linear light relative to the fθ lens 102 can be determined.

[0039] The characteristics of the fθ lens 102 make the incident angle of the linear light relative to the fθ lens 102 and the perpendicular distance r between the light spot formed by the linear light exiting from the fθ lens 102 to the image acquisition component 104 and the optical axis of the fθ lens 102 have the following linear relationship tanθ = f / r, where f is the focal length of the fθ lens 102. Therefore, according to the incident angle of the linear light relative to the fθ lens 102 and the focal length f of the fθ lens 102, the position of the ideal light spot of the linear light on the image plane of the image acquisition component 104 can be further determined.

[0040] S3. Adjust the to-be-adjusted sub-mirror 301 until the position of the detected light spot coincides with the position of the ideal light spot.

[0041] More specifically, the image plane image of the image acquisition component 104 showing the detected light spot can be exported in real time, and the determined ideal light spot can be displayed on the exported image using image processing software. During the adjustment of the to-be-adjusted sub-mirror 301, the position of the detected light spot on the exported image will change, and when the detected light spot on the exported image is observed to coincide with the ideal light spot, it means that the sub-mirror 301 is adjusted to the right position.

[0042] In an embodiment, the optical detection module 10 further comprises a reflecting component 103, in use, the linear light is reflected by the reflecting surface of the reflecting component 103 after being reflected by the to-be-adjusted mirror 301 and then is incident on the f theta lens 102. In order to ensure that the linear light emitted by the light source component 101 can be incident on the to-be-adjusted mirror 301, the light beam emitting port of the light source component 101 needs to be arranged towards the to-be-adjusted mirror 301 below. If the reflecting component 103 is not arranged, in order to ensure that the linear light reflected by the to-be-adjusted mirror 301 can be incident on the image plane of the image acquisition component 104, the image plane of the image acquisition component 104 also needs to be arranged towards the to-be-adjusted mirror 301 below. If the image plane of the image acquisition component 104 is arranged towards the to-be-adjusted mirror 301 below, the field of view range of the image acquisition component 104 cannot easily cover all positions where the linear light can appear, and thus the situation that the detection light spot cannot be formed on the image plane can occur. After the reflecting component 103 is arranged, the image plane of the image acquisition component 104 can be arranged towards the side where the light source component 101 is located. In this way, the field of view range of the image acquisition component 104 can easily cover all positions where the linear light can appear, and thus the situation that the detection light spot cannot be formed on the image plane can be avoided.

[0043] In an embodiment, the reflecting component 103 is a half-reflecting half-transmitting prism, which is arranged below the light source component 101. In use, the linear light is irradiated on the to-be-adjusted mirror 301 by the half-reflecting half-transmitting prism after being emitted by the light source component 101. In this way, the detection light spot with clear boundaries can be formed on the image plane, thereby facilitating subsequent adjustment operations.

[0044] In an embodiment, the light source component 101 is a laser. The linear light emitted by the laser has high brightness, and thus the clear detection light spot can be formed on the image plane, thereby facilitating subsequent adjustment operations.

[0045] In an embodiment, the image acquisition component 104 is a CMOS camera. The CMOS camera has clear imaging and can easily realize image export, thereby facilitating subsequent adjustment operations.

[0046] In an embodiment, the heliostat adjusting mechanism comprises a support module 20, in use, the optical detection module 10 is fixed on the support module 20.

[0047] More specifically, in the illustrated embodiment, the support module 20 comprises four supports 201 and two gantry frames 202, two supports 201 are fixed on each of the two gantry frames 202. In the figure, four heliostats 30 are shown, and the four heliostats 30 are all rectangular heliostats. Each of the four heliostats 30 comprises four sub-mirrors 301, and the four sub-mirrors 301 correspond to four optical detection modules 10 respectively. The four optical detection modules 10 corresponding to the four sub-mirrors 301 of the same heliostat 30 are fixed on the same support 201.

[0048] Of course, the structure of the supporting module 20 is not limited to the illustrated form, and can be flexibly arranged according to actual needs, as long as it can stably support the optical detection module 10 at a suitable position.

[0049] In addition, the heliostat adjusting mechanism and the heliostat adjusting method provided by the present application are not limited to adjusting the illustrated rectangular heliostat, but can be used to adjust any shape of heliostat, for example, Figure 4 the illustrated circular heliostat, or Figure 5 the illustrated polygonal heliostat.

[0050] In one embodiment, the position of the optical detection module 10 is adjusted by first adjusting the positions of the fθ lens 102, the image acquisition component 104 and the reflecting component 103, so that the optical axis of the fθ lens 102 is horizontal, the center point of the image plane of the image acquisition component 104 and the focal point of the fθ lens 102 are located on a horizontal line, and the angle between the reflecting surface of the reflecting component 103 and the horizontal plane is 45 degrees, and then adjusting the position of the light source component 101, so that the linear light emitted by the light source component 101 is vertically downwardly irradiated onto the sub-heliostat 301. In this way, the position of the light source component 101 can be adjusted according to the position of the light spot on the image plane and the center point of the image plane, and the position accuracy of the light source component 101 can be easily ensured.

[0051] More specifically, the position of the light source component 101 can be adjusted by the following method: a horizontal reflecting surface 40 is arranged below the light source component 101, the linear light emitted by the light source component 101 is reflected by the horizontal reflecting surface 40 and the reflecting surface of the reflecting component 103 in turn, and then forms a light spot on the image plane of the image acquisition component 104 through the fθ lens 102, the angle of the light source component 101 is adjusted according to the position of the light spot, until the position of the light spot is located at the center point of the image plane of the image acquisition component 104. When the position of the light spot is located at the center point of the image plane of the image acquisition component 104, the linear light emitted by the light source component 101 is vertically downwardly irradiated.

[0052] As can be seen from the above description, the heliostat adjusting mechanism provided by the present application has a simple structure, and the heliostat adjusting method implemented based on the heliostat adjusting mechanism is easy to implement, and the surface shape of the heliostat 30 can be conveniently and efficiently detected and adjusted.

[0053] The above describes the principles and implementation modes of the present application by using specific examples, and the above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A heliostat adjustment mechanism, characterized by, The heliostat adjusting mechanism comprises an optical detection module, the optical detection module comprises a light source component capable of emitting linear light, an f theta lens and an image acquisition component, in use, the linear light emitted by the light source component is irradiated onto the sub-mirror of the heliostat to be adjusted along a predetermined direction, the linear light is reflected by the sub-mirror to be adjusted and further projected onto the image plane of the image acquisition component through the f theta lens, and a detection light spot is formed on the image plane of the image acquisition component, and the position of the ideal light spot of the linear light on the image plane of the image acquisition component is determined according to the incident angle of the linear light relative to the f theta lens and the focal length f of the f theta lens; The optical detection module further comprises a reflection component, in use, the linear light is reflected by the reflection surface of the reflection component after being reflected by the sub-mirror to be adjusted and then is reflected onto the f theta lens; In use, the positions of the f theta lens, the image acquisition component and the reflection component are first adjusted, so that the optical axis of the f theta lens is horizontal, the center point of the image plane of the image acquisition component and the focal point of the f theta lens are located on a horizontal line, and the included angle between the reflection surface of the reflection component and the horizontal plane is 45 degrees, and then the position of the light source component is adjusted, so that the linear light emitted by the light source component is vertically downward irradiated onto the sub-mirror to be adjusted; The position of the light source component is adjusted by the following manner: a horizontal reflection surface is arranged below the light source component, the linear light emitted by the light source component is reflected by the horizontal reflection surface and the reflection surface of the reflection component in sequence and then is reflected onto the image plane of the image acquisition component through the f theta lens, the angle of the light source component is adjusted according to the position of the light spot, and the position of the light spot is located at the center point of the image plane of the image acquisition component.

2. The heliostat adjustment mechanism of claim 1, wherein, The reflection component is a half-reflection half-transmission prism, the half-reflection half-transmission prism is arranged below the light source component, and in use, the linear light is irradiated onto the sub-mirror to be adjusted through the half-reflection half-transmission prism after being emitted from the light source component.

3. The heliostat adjustment mechanism of any of claims 1-2, wherein, The light source component is a laser.

4. The heliostat adjustment mechanism of any of claims 1-2, wherein, The image acquisition component is a CMOS camera.

5. The heliostat adjustment mechanism of any of claims 1-2, wherein, The heliostat adjusting mechanism comprises a support module, in use, the optical detection module is fixed on the support module.

6. A method of aligning a heliostat, the method comprising: The heliostat adjusting method based on any one of claims 1-5 comprises the following steps: S1. installing the optical detection module above the sub-mirror of the heliostat to be adjusted, and then adjusting the position of the optical detection module, so that the linear light emitted by the light source component is irradiated onto the sub-mirror to be adjusted along a predetermined direction, the linear light is reflected by the sub-mirror to be adjusted and further projected onto the image plane of the image acquisition component through the f theta lens, and a detection light spot is formed on the image plane of the image acquisition component; The optical detection module further comprises a reflecting component, when adjusting the position of the optical detection module, first adjust the positions of the fθ lens, the image acquisition component and the reflecting component, make the optical axis of the fθ lens horizontal, make the image plane center point of the image acquisition component and the focal point of the fθ lens on a horizontal line, make the angle between the reflecting surface of the reflecting component and the horizontal plane 45 degrees, then adjust the position of the light source component, make the linear light emitted by the light source component vertically downward irradiate on the to-be-adjusted mirror; The position of the light source component is adjusted by the following way: a horizontal reflecting surface is arranged below the light source component, the linear light emitted by the light source component is reflected by the horizontal reflecting surface and the reflecting surface of the reflecting component in turn, then forms a light spot on the image plane of the image acquisition component through the fθ lens, the angle of the light source component is adjusted according to the position of the light spot, until the position of the light spot is located at the image plane center point of the image acquisition component; S2. According to the ideal normal line position of the to-be-adjusted mirror and the adjusted position of the optical detection module, the position of the ideal light spot of the linear light on the image plane of the image acquisition component is determined when the normal line position of the to-be-adjusted mirror is located at the ideal normal line position; the position of the ideal light spot of the linear light on the image plane of the image acquisition component is determined according to the incident angle of the linear light relative to the fθ lens and the focal length f of the fθ lens; S3. Adjust the to-be-adjusted mirror until the position of the detection light spot and the position of the ideal light spot coincide.

7. The method of claim 6, wherein, An optical detection module is installed above the center point of the to-be-adjusted mirror, so that the linear light emitted by the light source component irradiates on the center point of the to-be-adjusted mirror, and / or several optical detection modules are installed above the edge region of the to-be-adjusted mirror, so that the linear light emitted by the light source component irradiates on the edge region of the to-be-adjusted mirror.

Images