Photovoltaic module attitude simulation system and method

Abstract

The invention provides a photovoltaic module attitude simulation system and method. The system comprises a supporting platform; the movable end of the pose adjusting assembly is connected with the supporting platform; when the pose measurement assembly is installed on the supporting platform, first pose data of the supporting platform serving as a datum plane is obtained; when the pose measurement assembly is installed on the side, facing the sun, of the to-be-measured photovoltaic assembly, second pose data of the to-be-measured photovoltaic assembly is obtained; the irradiation meter is mounted on the supporting platform and is used for measuring the light irradiation intensity; wherein the pose adjusting assembly is used for adjusting the pose of the supporting platform based on the deviation of the first pose data relative to the second pose data, so that the plane where the supporting platform is located is parallel to the plane where the photovoltaic module to be measured is located. According to the photovoltaic module attitude simulation system provided by the invention, when the light irradiation intensity of the photovoltaic module is acquired, an operator does not need to carry a test instrument to the vicinity of the photovoltaic module to be measured, so that the test convenience is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a photovoltaic component posture simulation system and method. Background Art

[0002] With the continuous optimization of the global energy structure, photovoltaic power generation, as a representative of clean energy, is increasingly gaining attention from countries around the world. In mountainous and plain areas, photovoltaic power generation has become a new hotspot for green energy development due to its unique geographical advantages and resource endowments.

[0003] Mountain photovoltaic power stations are photovoltaic power stations located in mountainous or hilly areas. The special geographical conditions of mountainous areas usually cause the installation of photovoltaic panels to vary with the slope. Therefore, the orientation and irradiation conditions of each photovoltaic module will be different. Under the influence of the above special geographical conditions, the relevant testing of photovoltaic modules is relatively inconvenient. For example, when performing IV testing on each photovoltaic module, it is usually necessary for the operator to carry the IV test instrument to the vicinity of each photovoltaic module. The test instrument is large in size and heavy in weight, which makes it inconvenient to carry and affects the test efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a photovoltaic module posture simulation system and method, which can solve the technical problem that "under the influence of special geographical conditions, the relevant testing work of photovoltaic modules is relatively inconvenient. For example, when performing IV testing on each photovoltaic module, it is usually necessary for the operator to carry the IV testing instrument to the vicinity of each photovoltaic module. The testing instrument is large in size and heavy in weight, which makes it inconvenient to carry and affects the test efficiency."

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention provides a photovoltaic module posture simulation system, comprising: a support platform;

[0007] A posture adjustment component, a movable end of which is connected to the support platform;

[0008] a posture measurement component, which, when the posture measurement component is installed on the support platform, obtains first posture data of the support platform as a reference surface; and, when the posture measurement component is installed on the side of the photovoltaic component to be measured facing the sun, obtains second posture data of the photovoltaic component to be measured; and

[0009] A radiometer, mounted on the supporting platform, for measuring light radiation intensity;

[0010] The posture adjustment component is used to adjust the posture of the support platform based on the deviation of the first posture data relative to the second posture data, so that the plane where the support platform is located is parallel to the plane where the photovoltaic assembly to be measured is located.

[0011] In one embodiment of the present invention, the posture measurement component includes:

[0012] A sensor, when the posture measurement component is installed on the supporting platform, the sensor is used to obtain the first posture data; when the posture measurement component is installed on the side of the photovoltaic component to be measured facing the sun, the sensor is set close to the side of the photovoltaic component to be measured facing the sun, and is used to obtain the second posture data;

[0013] A first communicator, electrically connected to the posture adjustment component;

[0014] The first controller is electrically connected to the sensor and the first communicator respectively, and the first controller transmits the second posture data to the posture adjustment component through the first communicator.

[0015] In one embodiment of the present invention, the posture measurement assembly further includes a calibration switch, and the calibration switch is electrically connected to the first controller;

[0016] When the posture measurement component is installed on the supporting platform and when the calibration switch is in a triggered state, the first controller controls the sensor to perform calibration to obtain the first posture data.

[0017] In one embodiment of the present invention, the posture measurement component further includes a measurement switch, and the measurement switch is electrically connected to the first controller;

[0018] When the posture measurement component is installed on the side of the photovoltaic component to be measured facing the sun, and when the measurement switch is in a triggered state, the first controller transmits the second posture data to the posture adjustment component through the first communicator.

[0019] In one embodiment of the present invention, the posture adjustment component includes:

[0020] A first driving member, used for controlling the support platform to rotate around a first axis;

[0021] A second driving member, used for controlling the support platform to rotate around a second axis, wherein the second axis is perpendicular to the first axis;

[0022] a second communicator, electrically connected to the first communicator;

[0023] The second controller is electrically connected to the first driving member, the second driving member and the second communicator respectively. The second controller is used to control the first driving member and / or the second driving member to start up when receiving the second posture data so as to adjust the posture of the support platform.

[0024] In one embodiment of the present invention, the system further comprises an IV tester body, wherein the IV tester body is electrically connected to the irradiance meter, and the IV tester body is electrically connected to the photovoltaic assembly to be measured.

[0025] The present invention also provides a photovoltaic module posture simulation method, comprising:

[0026] Installing the posture measurement component on the support platform, and obtaining the first posture data of the support platform as a reference surface;

[0027] Installing the posture measurement component on the side of the photovoltaic component to be measured that faces the sun, and acquiring second posture data of the photovoltaic component to be measured;

[0028] Based on the deviation of the first posture data relative to the second posture data, the posture of the support platform is adjusted by a posture adjustment component so that the plane where the support platform is located is parallel to the plane where the photovoltaic assembly to be measured is located.

[0029] In one embodiment of the present invention, the step of installing the posture measurement component on the support platform and obtaining the first posture data of the support platform as a reference surface includes:

[0030] When the posture measurement component is installed on the support platform and the calibration switch is in a triggered state, the sensor is controlled by the first controller to perform calibration to obtain the first posture data.

[0031] In one embodiment of the present invention, the step of installing the posture measurement component on the side of the photovoltaic component to be measured facing the sun and obtaining the second posture data of the photovoltaic component to be measured includes:

[0032] When the posture measurement component is installed on the side of the photovoltaic component to be measured facing the sun, and when the measurement switch is in a triggered state, the second posture data is transmitted to the posture adjustment component through the first controller via the first communicator.

[0033] In one embodiment of the present invention, after the step of adjusting the posture of the support platform by a posture adjustment component based on the deviation of the first posture data relative to the second posture data so that the plane where the support platform is located is parallel to the plane where the photovoltaic assembly to be measured is located, the step further includes:

[0034] The light irradiance intensity is measured by a irradiometer and transmitted to the IV tester body, wherein the irradiometer is mounted on the supporting platform.

[0035] As described above, the present invention provides a photovoltaic module posture simulation system, which simulates the actual working posture of the photovoltaic module by adjusting the plane where the support platform is located to be parallel to the plane where the photovoltaic module to be measured is located. When collecting the light irradiation intensity of the photovoltaic module, there is no need for the operator to carry the test instrument to the vicinity of the photovoltaic module to be measured, which enhances the convenience of the test and is suitable for photovoltaic module testing and monitoring of mountain photovoltaic systems.

[0036] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0038] Figure 1 Schematic diagram of the principle of a photovoltaic module posture simulation system in one embodiment of the present invention.

[0039] Figure 2 This is a schematic diagram of the installation of a posture measurement component of a photovoltaic component posture simulation system in one embodiment of the present invention when it is installed on a support platform.

[0040] Figure 3 This is a schematic diagram of the installation of a posture measurement component of a photovoltaic component posture simulation system in one embodiment of the present invention when it is installed on a photovoltaic component to be measured.

[0041] Figure 4 Schematic diagram of the flow of a photovoltaic module posture simulation method in one embodiment of the present invention.

[0042] In the figure:

[0043] 100-support platform;

[0044] 200-posture measurement component, 210-first controller, 220-sensor, 230-first communicator, 240-calibration switch, 250-measurement switch;

[0045] 300-position adjustment component, 310-second controller, 320-second communicator, 330-first drive member, 340-second drive member;

[0046] 400-Radiometer. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Refer to the attached Figure 1-4 A photovoltaic component posture simulation system according to the first embodiment of the present application is exemplarily described. The photovoltaic component posture simulation system includes a support platform 100, a posture measurement component 200, a posture adjustment component 300 and a irradiance meter 400. The movable end of the posture adjustment component 300 is connected to the support platform 100; when the posture measurement component 200 is installed on the support platform 100, the posture measurement component 200 can obtain the first posture data of the support platform 100 as a reference surface; when the posture measurement component 200 is installed on the side of the photovoltaic component to be measured facing the sun, the posture measurement component 200 can obtain the second posture data of the photovoltaic component to be measured; the irradiance meter 400 is installed on the support platform 100 for measuring the light irradiation intensity; wherein, the posture adjustment component 300 is used to adjust the posture of the support platform 100 based on the deviation of the first posture data relative to the second posture data, so that the plane where the support platform 100 is located is parallel to the plane where the photovoltaic component to be measured is located.

[0049] In the embodiment of the present application, the support platform 100 provides a mounting platform for the posture measurement component 200 and the irradiometer 400, see Figure 2 The supporting platform 100 may be a plate-like structure with a flat surface.

[0050] In the embodiment of the present application, the movable end of the posture adjustment component 300 is connected to the support platform 100. The posture adjustment component 300 and the support platform 100 form a dual-axis platform, that is, the support platform 100 can be adjusted on two mutually perpendicular axes.

[0051] Specifically, the posture adjustment component 300 includes a first driving member 330, a second driving member 340, a second communicator 320 and a second controller 310. The first driving member 330 is used to control the support platform 100 to rotate around a first axis, and the second driving member 340 is used to control the support platform 100 to rotate around a second axis, and the second axis is perpendicular to the first axis. The second communicator 320 is electrically connected to the first communicator 230, and the second controller 310 is electrically connected to the first driving member 330, the second driving member 340 and the second communicator 320. The second controller 310 is used to control the first driving member 330 and / or the second driving member 340 to start when receiving the second posture data to adjust the posture of the support platform 100.

[0052] See also Figure 2 The first axis is the central axis of the supporting platform 100, and the second axis is perpendicular to the central axis.

[0053] For example, the first driving member 330 and the second driving member 340 can be motors, and the motors can be stepper motors of series models such as 42BYGHM or 86BYG250. The above motor models are examples, and those skilled in the art can also select other types of driving members or other types of motors according to actual conditions, without specific limitation.

[0054] By way of further example, the specific connection structure of the dual-axis platform can be as follows: the output shaft of the second motor is connected to a support frame, the first motor is installed on the support frame, the output shaft of the first motor is connected to the support platform 100, the first motor drives the support platform 100 to rotate around the first axis, and the second motor drives the support frame, the first motor and the support platform 100 to rotate around the second axis, thereby realizing the rotation of the support platform 100 around the second axis by the second motor.

[0055] For example, the first communicator 230 and the second communicator 320 are connected by wireless connection. Those skilled in the art may select a suitable wireless transmission technology according to actual conditions, without making any specific limitation.

[0056] In an embodiment of the present application, when the posture measurement component 200 is installed on the supporting platform 100, the posture measurement component 200 can obtain the first posture data of the supporting platform 100 as a reference surface; when the posture measurement component 200 is installed on the side of the photovoltaic component to be measured facing the sun, the posture measurement component 200 can obtain the second posture data of the photovoltaic component to be measured.

[0057] The posture measurement component 200 is mainly used to determine the posture data of the object, which is important information describing the position and posture of the object in three-dimensional space. Specifically, when the posture measurement component 200 is installed on the support platform 100, the posture measurement component 200 can be used to obtain the position and posture information of the support platform 100 (that is, the first posture data), and the first posture data is used as a reference for subsequent adjustments; when the posture measurement component 200 is installed on the side of the photovoltaic component to be measured facing the sun, the posture measurement component 200 can be used to obtain the position and posture information of the photovoltaic component to be measured (that is, the second posture data).

[0058] It should be noted that when the posture measurement component 200 is installed on the support platform 100, the posture measurement component 200 can be used to obtain the first posture data of the support platform 100. At this time, the support platform 100 serves as a reference surface, and the support platform 100 is usually in a leveling state, that is, the support platform 100 does not rotate on any axis.

[0059] Specifically, the posture measurement component 200 includes a sensor 220, a first communicator 230 and a first controller 210. When the posture measurement component 200 is installed on the support platform 100, the sensor 220 is used to obtain the first posture data; when the posture measurement component 200 is installed on the side of the photovoltaic component to be measured facing the sun, the sensor 220 is set close to the side of the photovoltaic component to be measured facing the sun, and is used to obtain the second posture data. The first communicator 230 is electrically connected to the posture adjustment component 300; the first controller 210 is electrically connected to the sensor 220 and the first communicator 230 respectively, and the first controller 210 transmits the second posture data to the posture adjustment component 300 through the first communicator 230.

[0060] When the posture measurement assembly 200 is installed on the side of the photovoltaic assembly to be measured facing the sun, the sensor 220 is set close to the side of the photovoltaic assembly to be measured facing the sun, so as to ensure the accuracy and reliability of the posture data of the photovoltaic assembly to be measured. At the same time, when the posture measurement assembly 200 is installed on the support platform 100, the sensor 220 should also be set close to the side of the support platform 100 facing the sun.

[0061] For example, the sensor 220 is an IMU (inertial measurement unit) sensor 220. The inertial measurement unit is a detection unit that integrates multiple sensors 220, which can measure the posture data of the support platform 100 in real time. In some other embodiments, those skilled in the art can use other types of sensors as long as the sensor can realize the function of obtaining posture data.

[0062] In an embodiment of the present application, the posture measurement component 200 also includes a calibration switch 240, which is electrically connected to the first controller 210; when the posture measurement component 200 is installed on the support platform 100 and when the calibration switch 240 is in a triggered state, the first controller 210 controls the sensor 220 to calibrate to obtain the first posture data.

[0063] In an embodiment of the present application, the posture measurement component 200 also includes a measuring switch 250, which is electrically connected to the first controller 210; when the posture measurement component 200 is installed on the side of the photovoltaic component to be measured facing the sun, and when the measuring switch 250 is in a triggered state, the first controller 210 transmits the second posture data to the posture adjustment component 300 through the first communicator 230.

[0064] In the present application, the calibration switch 240 and the measurement switch 250 are used to control the calibration process and the measurement process respectively. The settings of the calibration switch 240 and the measurement switch 250 enable the user to manually trigger the calibration process and the measurement process, thereby improving the controllability and reliability of the system. In addition, the user can trigger the calibration and measurement at any time as needed, thereby enhancing the user experience.

[0065] In the embodiment of the present application, the radiometer 400 is installed on the support platform 100 and is used to measure the light irradiation intensity. The system also includes an IV tester body, which is electrically connected to the radiometer 400, and the IV tester body is electrically connected to the photovoltaic module to be measured. The IV tester body and the radiometer 400 constitute an IV test instrument, and the IV test instrument is usually equipped with a high-precision radiometer. The IV test instrument can measure the current-voltage characteristic curve of the photovoltaic module, which is used to measure the power generation capacity of the photovoltaic module. At the same time, the performance of the photovoltaic module will be affected by the light irradiation intensity, and changes in the light irradiation intensity will affect the IV characteristic curve of the photovoltaic module.

[0066] For example, the support platform 100 and the posture adjustment assembly 300 can be located near the inverter and the junction box, the irradiance meter 400 is installed on the side of the support platform 100 facing the sun, and the IV tester body is electrically connected to the irradiance meter 400 and is located near the support platform 100. When the IV tester is used to perform IV test on the photovoltaic assembly to be tested, the IV tester body is electrically connected to the photovoltaic assembly to be measured, that is, the IV tester body can be connected to the output line of the corresponding photovoltaic assembly, and at the same time, the IV tester body receives the light irradiation intensity of the corresponding photovoltaic assembly to be measured transmitted from the irradiance meter 400, thereby realizing the IV test of the corresponding photovoltaic assembly to be measured.

[0067] In an embodiment of the present application, the posture adjustment component 300 is used to adjust the posture of the support platform 100 based on the deviation of the first posture data relative to the second posture data, so that the plane where the support platform 100 is located is parallel to the plane where the photovoltaic component to be measured is located. The special geographical conditions in mountainous areas make the installation of photovoltaic panels usually vary with the slope. Therefore, the orientation and irradiation conditions of each photovoltaic component will be different. This application simulates the actual working posture of the photovoltaic component by adjusting the plane where the support platform 100 is located to be parallel to the plane where the photovoltaic component to be measured is located. When it is necessary to collect the light irradiation intensity of any photovoltaic component, there is no need for the operator to carry the test instrument to the vicinity of the photovoltaic component, which enhances the convenience of the test and is suitable for IV testing and monitoring of mountain photovoltaic systems.

[0068] The actual workflow of this application is as follows:

[0069] During the calibration process: first level the support platform 100, place the posture measurement component 200 on the leveled support platform 100, press the calibration switch 240, synchronize the first posture data of the posture measurement component 200 and the support platform 100, and use it as a reference for subsequent adjustments.

[0070] During the measurement process: bring the posture measurement component 200 to the photovoltaic component to be measured, place the posture measurement component 200 on the plane of the photovoltaic component to be measured facing the sun, press the measurement switch 250, and transmit the second posture data of the photovoltaic component to be measured to the posture adjustment component 300 by wireless means. The posture adjustment component 300 is used to adjust the posture of the support platform 100 based on the deviation of the first posture data relative to the second posture data, so that the plane where the support platform 100 is located is parallel to the plane where the photovoltaic component to be measured is located, thereby simulating the posture of the photovoltaic component to be measured.

[0071] During the IV test: the main body of the IV tester is connected completely, the light irradiation intensity in this position is measured by the irradiometer 400 on the support platform 100, and then the light irradiation intensity is transmitted to the main body of the IV tester, and then the IV test is performed.

[0072] The present application also provides a photovoltaic module posture simulation method, comprising:

[0073] S1: Install the posture measurement component 200 on the support platform 100 to obtain the first posture data of the support platform 100 as a reference surface;

[0074] Step S1 specifically includes: when the posture measurement component 200 is installed on the support platform 100 and when the calibration switch 240 is in a triggered state, the sensor 220 is controlled by the first controller 210 to perform calibration to obtain the first posture data.

[0075] S2: Install the posture measurement component 200 on the side of the photovoltaic component to be measured that faces the sun, and obtain second posture data of the photovoltaic component to be measured;

[0076] Step S2 specifically includes: when the posture measurement component 200 is installed on the side of the photovoltaic component to be measured facing the sun, and when the measurement switch 250 is in a triggered state, the second posture data is transmitted to the posture adjustment group through the first controller 210 via the first communicator 230.

[0077] S3: Based on the deviation of the first posture data relative to the second posture data, the posture of the support platform 100 is adjusted by the posture adjustment component 300 so that the plane where the support platform 100 is located is parallel to the plane where the photovoltaic assembly to be measured is located.

[0078] After step S3 , the method further includes: measuring the light irradiation intensity by using a irradiance meter 400 , and transmitting the light irradiation intensity to the IV tester body, wherein the irradiance meter 400 is installed on the supporting platform 100 .

[0079] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A photovoltaic module posture simulation system, characterized in that: include: Support platform; A posture adjustment component, a movable end of which is connected to the support platform; A posture measurement component, when the posture measurement component is installed on the support platform, obtains the first posture data of the support platform as a reference surface; when the posture measurement component is installed on the side of the photovoltaic component to be measured facing the sun, obtains the second posture data of the photovoltaic component to be measured; as well as A radiometer, mounted on the supporting platform, for measuring light radiation intensity; The posture adjustment component is used to adjust the posture of the support platform based on the deviation of the first posture data relative to the second posture data, so that the plane where the support platform is located is parallel to the plane where the photovoltaic assembly to be measured is located.

2. The photovoltaic module posture simulation system according to claim 1, characterized in that: The posture measurement component comprises: A sensor, when the posture measurement component is installed on the supporting platform, the sensor is used to obtain the first posture data; when the posture measurement component is installed on the side of the photovoltaic component to be measured facing the sun, the sensor is set close to the side of the photovoltaic component to be measured facing the sun, and is used to obtain the second posture data; A first communicator, electrically connected to the posture adjustment component; The first controller is electrically connected to the sensor and the first communicator respectively, and the first controller transmits the second posture data to the posture adjustment component through the first communicator.

3. The photovoltaic module posture simulation system according to claim 2, characterized in that: The posture measurement assembly further includes a calibration switch, wherein the calibration switch is electrically connected to the first controller; When the posture measurement component is installed on the supporting platform and when the calibration switch is in a triggered state, the first controller controls the sensor to perform calibration to obtain the first posture data.

4. The photovoltaic module posture simulation system according to claim 3, characterized in that: The posture measurement component also includes a measurement switch, and the measurement switch is electrically connected to the first controller; When the posture measurement component is installed on the side of the photovoltaic component to be measured facing the sun, and when the measurement switch is in a triggered state, the first controller transmits the second posture data to the posture adjustment component through the first communicator.

5. The photovoltaic module posture simulation system according to claim 2, characterized in that: The posture adjustment component comprises: A first driving member, used for controlling the support platform to rotate around a first axis; A second driving member, used for controlling the support platform to rotate around a second axis, wherein the second axis is perpendicular to the first axis; a second communicator, electrically connected to the first communicator; The second controller is electrically connected to the first driving member, the second driving member and the second communicator respectively. The second controller is used to control the first driving member and / or the second driving member to start up when receiving the second posture data so as to adjust the posture of the support platform.

6. The photovoltaic module posture simulation system according to any one of claims 1 to 5, characterized in that: The system further comprises an IV tester body, wherein the IV tester body is electrically connected to the irradiance meter and the IV tester body is electrically connected to the photovoltaic assembly to be measured.

7. A photovoltaic module posture simulation method, characterized in that: include: Installing the posture measurement component on the support platform, and obtaining the first posture data of the support platform as a reference surface; Installing the posture measurement component on the side of the photovoltaic component to be measured that faces the sun, and acquiring second posture data of the photovoltaic component to be measured; Based on the deviation of the first posture data relative to the second posture data, the posture of the support platform is adjusted by a posture adjustment component so that the plane where the support platform is located is parallel to the plane where the photovoltaic assembly to be measured is located.

8. The photovoltaic assembly posture simulation method according to claim 7, characterized in that: The step of installing the posture measurement component on the support platform and obtaining the first posture data of the support platform as a reference surface includes: When the posture measurement component is installed on the support platform and the calibration switch is in a triggered state, the sensor is controlled by the first controller to perform calibration to obtain the first posture data.

9. The photovoltaic assembly posture simulation method according to claim 8, characterized in that: The step of installing the posture measurement component on the side of the photovoltaic component to be measured facing the sun to obtain the second posture data of the photovoltaic component to be measured includes: When the posture measurement component is installed on the side of the photovoltaic component to be measured facing the sun, and when the measurement switch is in a triggered state, the second posture data is transmitted to the posture adjustment component through the first controller via the first communicator.

10. The photovoltaic module posture simulation method according to claim 7, characterized in that: After the step of adjusting the posture of the support platform by a posture adjustment component based on the deviation of the first posture data relative to the second posture data so that the plane where the support platform is located is parallel to the plane where the photovoltaic assembly to be measured is located, the method further includes: The light irradiance intensity is measured by a irradiometer and transmitted to the IV tester body, wherein the irradiometer is mounted on the supporting platform.

Images