Illuminance detection device and method

Abstract

The present application provides an illuminance detection device and method. The illuminance detection device comprises: at least three illuminance sensors; each illuminance sensor is arranged on an optical path of light to be detected, and each illuminance sensor has a photosensitive surface for receiving said light; and the illuminance detection device is configured to determine, on the basis of each first illuminance detected by each illuminance sensor for said light, a second illuminance in a direction perpendicular to said light. According to the device, the illuminance of light is detected by using a plurality of illuminance sensors, thereby reducing an illuminance error caused by detecting by a single illuminance detector.

Description

Light intensity detection device and method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application No. 202411383157.7, filed on September 30, 2024, and entitled "Light intensity detection device and method", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] Embodiments of the present application relate to the field of optical technology, in particular to a light intensity detection device and method. BACKGROUND

[0004] A light intensity sensor is a sensor used to measure the intensity or radiation of light. Light intensity sensors can convert the intensity or radiation of light into an electrical signal or other measurable form for recording, monitoring or control. These sensors have a wide range of applications in various fields, including but not limited to solar power generation systems, lighting control systems, environmental monitoring and optical communication, etc. The types and working principles of light intensity sensors are diverse, including photodiodes, photoresistors, photocells and photodetectors, etc. These sensors can measure the intensity of light in different wavelength ranges, such as visible light, ultraviolet light and infrared light, with different sensitivities and response characteristics. Through light intensity sensors, quantitative data about light intensity can be obtained, enabling monitoring, control and optimization of lighting conditions.

[0005] Currently, when detecting the intensity of light, a light intensity sensor is usually used for detection. For example, when detecting the intensity of sunlight that pours into a head-up display, a light intensity sensor is usually used for measurement. However, when the pouring sunlight is not perpendicular to the light intensity sensor, the measurement value of the light intensity sensor cannot represent the true intensity of sunlight perpendicular to the direction of sunlight, resulting in errors in the output of the light intensity sensor. SUMMARY

[0006] Embodiments of the present application provide a light intensity detection device and method, which can reduce the light intensity error of a single light intensity detector by using multiple light intensity sensors to detect the intensity of light.

[0007] In a first aspect, the present application provides a light intensity detection device, comprising: at least three light intensity sensors; each of the light intensity sensors is arranged on the light path of the light to be detected, and each of the light intensity sensors has a photosensitive surface for receiving the light to be detected; wherein the light intensity detection device is configured to determine a second light intensity perpendicular to the direction of the light to be detected based on the first light intensity detected by each of the light intensity sensors.

[0008] In some embodiments, the planes in which the light-receiving surfaces of the light intensity sensors are located are perpendicular to each other.

[0009] In some embodiments, the planes in which the light-receiving surfaces of the light intensity sensors are located are not perpendicular to each other.

[0010] In some embodiments, the light intensity detection device further comprises a housing, the housing has a plurality of sides, the number of the sides is equal to the number of the light intensity sensors, and each side corresponds to one light intensity sensor, and the light-receiving surface of each light intensity sensor is arranged on the corresponding side.

[0011] In some embodiments, the side is an inner side or an outer side of the housing.

[0012] In some embodiments, the central axis of the housing is parallel to the direction of the light to be detected.

[0013] In some embodiments, the areas of the light-receiving surfaces of the light intensity sensors are equal.

[0014] In some embodiments, the number of the light intensity sensors is three.

[0015] In a second aspect, the embodiments of the present application provide a light intensity detection method, which is applied to the light intensity detection device as described in any one of the first aspect, and the light intensity detection method comprises: obtaining first light intensities detected by the light intensity sensors on the light to be detected; and determining a second light intensity perpendicular to the direction of the light to be detected based on the first light intensities.

[0016] In some embodiments, the light intensity detection device comprises three light intensity sensors, the planes in which the light-receiving surfaces of the light intensity sensors are located are perpendicular to each other, and the determining of the second light intensity perpendicular to the direction of the light to be detected based on the first light intensities comprises: taking the sum of the first light intensities as the second light intensity.

[0017] Compared with the prior art, the beneficial effects of the present application are: different from the prior art, the embodiments of the present application provide a light intensity detection device and method, the light intensity detection device comprises: at least three light intensity sensors; each light intensity sensor is arranged on the light path of the light to be detected, and each light intensity sensor has a light-receiving surface for receiving the light to be detected; wherein the light intensity detection device is configured to determine a second light intensity perpendicular to the direction of the light to be detected based on first light intensities detected by the light intensity sensors on the light to be detected. The device can reduce the light intensity error of a single light intensity detector by using a plurality of light intensity sensors to detect the light intensity. BRIEF DESCRIPTION OF DRAWINGS

[0018] The embodiments will be described in a manner illustrative of the principles of the application without limiting the same to the details shown. The embodiments are intended to cover all alternatives, modifications and equivalents of the principles of the application as described by the scope of the claims. The same reference numbers in different drawings identify the same elements.

[0019] Fig. 1 is a structural schematic diagram of a light intensity detection device according to an embodiment of the present application;

[0020] Fig. 2 is a structural schematic diagram of another light intensity detection device according to an embodiment of the present application;

[0021] Fig. 3 is a schematic diagram of an equivalent geometric model according to an embodiment of the present application;

[0022] Fig. 4 is a flowchart of a light intensity detection method according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] The present application will be described in detail below with specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made. These are within the scope of the present application.

[0024] In order to facilitate understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used in the specification have the same meaning as understood by those skilled in the art of the present application. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application and are not intended to limit the present application. The term "and / or" used in the specification includes any and all combinations of one or more related listed items.

[0025] It should be noted that, if there is no conflict, each feature in the embodiments of the present application can be combined with each other, and all within the scope of the present application. In addition, although the functional modules are divided in the device schematic diagram, in some cases, the module division in the device can be different. In addition, the "first", "second" and the like used herein do not limit the data and execution order, but only distinguish the same items or similar items with basically the same function and effect.

[0026] In a first aspect, the embodiments of the present application provide a light intensity detection device, which comprises at least three light intensity sensors.

[0027] Each light intensity sensor is arranged on the light path of the light to be detected, and each light intensity sensor has a photosensitive surface for receiving the light to be detected. The light intensity detection device is configured to determine the second light intensity perpendicular to the direction of the light to be detected based on the first light intensity detected by each light intensity sensor.

[0028] The light intensity sensor can include a photoresistor, a photodiode, a light power meter, an illuminometer, a solar irradiance meter, etc., so that the photosensitive surface of the light intensity sensor can detect the light intensity after receiving the light.

[0029] For example, in the light intensity detection device 10 shown in FIG. 1, the light intensity detection device 10 includes three light intensity sensors, i.e., light intensity sensor 11, light intensity sensor 12, and light intensity sensor 13. By arranging the three light intensity sensors in the propagation direction of the same light to be detected and making each light intensity sensor form a preset angle with the propagation direction of the light to be detected, each light intensity sensor can receive the light to be detected. In this way, each light intensity sensor can independently measure the first light intensity at its location, and the light intensity detection device 10 can combine the first light intensity of each light intensity sensor and the arrangement position of each light intensity sensor to derive and calculate the second light intensity perpendicular to the direction of the light to be detected. The light intensity detection device 10 can be internally provided with a micro control processor to perform the above-mentioned process of calculating the second light intensity. When the light intensity detection device 10 is applied to a head-up display, the light intensity detection device 10 can be arranged in the propagation direction of the sunlight entering the head-up display, thereby calculating the second light intensity perpendicular to the direction of the sunlight, improving the accuracy of the sunlight intensity output by the light intensity detection device 10, and reducing the light intensity error detected by a single light intensity detector.

[0030] In some embodiments, the planes in which the photosensitive surfaces of the light intensity sensors are arranged are perpendicular to each other, or the planes in which the photosensitive surfaces of the light intensity sensors are arranged are not perpendicular to each other.

[0031] The photosensitive surface is the surface of the light intensity sensor for receiving the light to be detected, which is usually a plane and is composed of a photosensitive element, and can sense incident light and generate a response. In addition, the structures of the light intensity sensors are consistent, and the areas of the photosensitive surfaces of the light intensity sensors are equal.

[0032] The planes in which the photosensitive surfaces of the light intensity sensors are arranged are perpendicular to each other means that the plane in which the photosensitive surface of each light intensity sensor is arranged is perpendicular to the plane in which the photosensitive surface of any other light intensity sensor is arranged. The planes in which the photosensitive surfaces of the light intensity sensors are arranged are not perpendicular to each other means that the plane in which the photosensitive surface of each light intensity sensor is arranged is not perpendicular to the plane in which the photosensitive surface of any other light intensity sensor is arranged, that is, the included angle between them is not 90 degrees.

[0033] It can be understood that when detecting the illumination intensity of the light, the illumination intensity (or the illumination, the irradiance) of the light to be detected in the direction perpendicular to the direction of the light to be detected is generally considered, instead of the illumination intensity of the light to be detected in the direction of the sea level or in other directions. In order to accurately measure the illumination intensity of the light to be detected in the direction perpendicular to the direction of the light to be detected, if the measurement is performed by using a single light intensity sensor, the illumination intensity directly measured by the light intensity sensor cannot represent the real illumination intensity in the direction perpendicular to the direction of the light to be detected when the direction of the light to be detected is not perpendicular to the light sensing surface of the light intensity sensor. In the embodiment, by allowing the light sensing surfaces of the light intensity sensors to be perpendicular or not perpendicular to each other, the error caused by the single light intensity sensor can be eliminated, and by acquiring the illumination intensity detected by each light intensity sensor and the angle between the light sensing surface of each light intensity sensor and the direction of the light to be detected, the illumination intensity of the light to be detected in the direction perpendicular to the direction of the light to be detected can be calculated, so that the measurement accuracy can be improved.

[0034] In some embodiments, the light intensity detection device 10 further comprises a shell. The shell has a plurality of sides, the number of the sides is equal to the number of the light intensity sensors, and the sides correspond to the light intensity sensors one by one, and the light sensing surface of each light intensity sensor is arranged on the corresponding side.

[0035] The shell is used for fixing the light intensity sensors, and the specific shape of the shell can be set according to actual needs, which is not limited herein.

[0036] Specifically, as shown in FIG. 1, the light intensity detection module comprises a shell, a light intensity sensor 11, a light intensity sensor 12 and a light intensity sensor 13. The shell can have a shape of a right triangular pyramid, the outer side surfaces A1B1D1, A1C1D1 and A1B1C1 of the right triangular pyramid are perpendicular to each other, the light sensing surface of the light intensity sensor 11, the light sensing surface of the light intensity sensor 12 and the light sensing surface of the light intensity sensor 13 are arranged on the three outer side surfaces of the shell respectively, wherein the centers of the light sensing surfaces of the light intensity sensors are equidistant from the bottom surface B1C1D1 of the shell, and the centers of the light sensing surfaces of the light intensity sensors are in the same plane and perpendicular to the bottom surface B1C1D1.

[0037] Alternatively, as shown in FIG. 2, the shell can have a shape of a right triangular pyramid without a bottom surface, the inner side surfaces A2B2D2, A2C2D2 and A2B2C2 of the right triangular pyramid are perpendicular to each other, and the light sensing surface of the light intensity sensor 11, the light sensing surface of the light intensity sensor 12 and the light sensing surface of the light intensity sensor 13 are arranged on the three inner side surfaces of the shell respectively.

[0038] In the embodiment, by arranging the light intensity sensors on the shell, the position of the light intensity detection module can be conveniently set subsequently.

[0039] In some embodiments, the side is an inner side or an outer side of the shell.

[0040] As shown in FIG. 1, each light intensity sensor is arranged on the outer side of the shell, or as shown in FIG. 2, each light intensity sensor is arranged on the inner side of the shell. By arranging the light intensity sensor on the inner side or the outer side of the shell, the designer can flexibly choose according to the specific needs and use scenarios of the product. For example, in some applications that require protection of the sensor from the direct influence of the external environment (such as the requirement of hiding the sensor to improve the aesthetics due to the requirement of preventing other light from affecting or special visual requirements), the sensor can be placed on the inner side, while in applications that require more direct perception of the change of external environmental light, the outer side is a more suitable choice. Different devices and scenarios have different requirements for the position and orientation of the light intensity sensor, and the flexibility provided by this embodiment enables the product to be more widely adapted to different market needs and application scenarios.

[0041] In some embodiments, the areas of the light-receiving surfaces of the light intensity sensors are equal.

[0042] The light-receiving surface is the part of the light intensity sensor that receives the light signal and converts it into an electrical signal (or other measurable signal). When the areas of the light-receiving surfaces of the light intensity sensors are equal, it means that they have the same physical basis in receiving the light signal, i.e. their sensitivity to the light signal (under the same light conditions) should be similar in theory.

[0043] In the light intensity detection device 10 composed of multiple light intensity sensors, if the areas of the light-receiving surfaces of the light intensity sensors are not equal, the process of calculating the second light intensity is more complex, while when the areas of the light-receiving surfaces of the sensors are equal, the calculation process can be greatly simplified, reducing the complexity of the calculation process.

[0044] In some embodiments, the central axis of the shell is parallel to the direction of the light to be detected.

[0045] Specifically, in the embodiment shown in FIG. 1, the central axis of the shell is a straight line connecting the apex of the shell and the center of the bottom surface B1C1D1. By arranging the central axis of the shell parallel to the light to be detected, and since the light-receiving surfaces of the light intensity sensors are of the same size, the first light intensity received by the three light intensity sensors can be the same, which facilitates the subsequent calculation of the second light intensity of the light to be detected perpendicular to the direction of the light to be detected.

[0046] For example, if the light-sensitive surface areas of the light intensity sensors 11, 12 and 13 are equal, for the convenience of calculation, each light-sensitive surface is simplified as an equilateral right triangle, as shown in FIG. 3, the light intensity sensor 11 is equivalent to a right triangle ABC, the light intensity sensor 12 is equivalent to a right triangle ACD, and the light intensity sensor 13 is equivalent to a right triangle ABD, the three sides AB, AC and AD of the triangular pyramid A-BCD are perpendicular to each other, O is the projection of point A on the bottom surface BCD, BO and DO are connected,

[0047] BA is perpendicular to CA and DA, and CA intersects DA at A,

[0048] BA is perpendicular to the plane ACD, and CD is in the plane ACD,

[0049] CD is perpendicular to BA,

[0050] AO is perpendicular to the plane BDC, and CD is in the plane BDC,

[0051] CD is perpendicular to AO,

[0052] AO intersects BA at A,

[0053] CD is perpendicular to the plane ABO, that is, BO is perpendicular to CD,

[0054] BO is the height of the side DC.

[0055] Similarly, DO is the height of the side BC, so O is the orthocenter of the triangle BDC. That is, in the right spatial tetrahedron ABCD, O is the orthocenter of the triangle BCD, BO and CD are extended to intersect at point E, E is the center of CD, and it is known that AE is perpendicular to CD. Since AB, AC and AD are perpendicular to each other, it can be obtained that the projection O of A on the bottom surface is the orthocenter of the bottom surface triangle BCD, BE is perpendicular to CD, and it is obtained that:

[0056] Then,

[0057] Assuming that the sensing coefficient of the light intensity sensor is α, the second light intensity of the straight light in the direction AO is

[0058] That is, in the embodiment shown in FIG. 3, if the first light intensities detected by the light intensity sensors 11, 12 and 13 are x, y and z respectively, when the central axis of the shell is parallel to the direction of the light to be detected, the second light intensity of the light to be detected perpendicular to the direction of the light to be detected is I=x+y+z.

[0059] In this embodiment, the method of using multiple sensors for measurement can reduce the error caused by a single light intensity sensor, and the setting positions of the light intensity sensors can be adjusted to simplify the process of calculating the second light intensity.

[0060] In a second aspect, the embodiments of the present application provide a light intensity detection method. Referring to FIG. 4, the light intensity detection method is applied to the light intensity detection device 10 of any one of the first aspect, and the light intensity detection method comprises the following steps:

[0061] Step S10: obtaining the first light intensity detected by each light intensity sensor.

[0062] The execution subject of the light intensity detection method can be a control device arranged in the light intensity detection device 10 or an externally connected control device. The control device comprises at least one processor, and a memory in communication connection with the at least one processor. The memory stores instructions executable by the at least one processor. The instructions are executed by the at least one processor to enable the at least one processor to execute the method as described in the embodiments. The specific model can be set according to actual needs, which is not limited herein.

[0063] Specifically, the control device can be electrically connected with each light intensity sensor, so that each light intensity sensor obtains the first light intensity detected by each light intensity sensor.

[0064] Step S20: determining the second light intensity perpendicular to the direction of the light to be detected based on the first light intensity.

[0065] After obtaining the first light intensity, the second light intensity can be calculated based on the area of the light sensing surface of each light intensity sensor and the included angle between each light intensity sensor and the direction of the light to be detected.

[0066] Specifically, in the embodiment shown in FIG. 1, the light intensity detection device 10 comprises three light intensity sensors, and the planes where the light sensing surfaces of the light intensity sensors are located are perpendicular to each other. Step S20 comprises: taking the sum of the first light intensity as the second light intensity, that is, adding the first light intensity to obtain the second light intensity.

[0067] In the embodiment, the second light intensity perpendicular to the direction of the light to be detected can be determined by the above method. Compared with the method of using one light intensity sensor for detection, the embodiment can improve the accuracy of light intensity detection.

[0068] It should be noted that the device embodiments described above are only schematic, and the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or distributed on multiple network units. According to actual needs, part or all of the modules can be selected to achieve the purpose of the embodiments of the present application.

[0069] Those skilled in the art can clearly understand the technical solutions of the embodiments from the above description of the embodiments, and the embodiments can be implemented by means of software plus a general hardware platform, or by hardware. Based on such an understanding, the above technical solutions, essentially or in terms of related art, can be embodied in the form of a software product, and the computer software product can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for executing the methods of the various embodiments or some parts of the methods by at least one computer device (which can be a personal computer, a server, or a network device, etc.).

[0070] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; under the idea of the present application, the technical features of the above examples or different examples can also be combined, the steps can be implemented in any order, and there are many other changes of the different aspects of the present application as described above. In order to be brief, they are not provided in detail; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical intensity detection device, characterized by The light intensity detection device comprises: at least three light intensity sensors; each of the light intensity sensors is arranged on a light path of a light to be detected, and each of the light intensity sensors has a light-receiving surface for receiving the light to be detected; wherein the light intensity detection device is configured to determine a second light intensity perpendicular to a direction of the light to be detected based on first light intensities detected by the light intensity sensors.

2. The optical intensity detection apparatus according to claim 1, wherein The light-receiving surfaces of the light intensity sensors are arranged on mutually perpendicular planes.

3. The optical intensity detection apparatus of claim 1, wherein The light-receiving surfaces of the light intensity sensors are arranged on mutually non-perpendicular planes.

4. The light intensity detection device according to any one of claims 1 to 3, characterized in that The light intensity detection device further comprises a housing; the housing has a plurality of side surfaces, the number of the side surfaces is equal to the number of the light intensity sensors, and each of the side surfaces corresponds to one of the light intensity sensors, and the light-receiving surface of each of the light intensity sensors is arranged on the corresponding side surface.

5. The optical intensity detection apparatus of claim 4, wherein The side surface is an inner side surface or an outer side surface of the housing.

6. The light intensity detection device according to claim 5, wherein: a central axis of the housing is parallel to a direction of the light to be detected.

7. The optical power detection device according to any one of claims 1 to 3, wherein The light-receiving surfaces of the light intensity sensors have equal areas.

8. The optical power detection device according to any one of claims 1 to 3, wherein The number of the light intensity sensors is three.

9. A method of light intensity detection, characterized by, The light intensity detection method is applied to the light intensity detection device according to any one of claims 1-6, and the light intensity detection method comprises: obtaining first light intensities detected by the light intensity sensors on the light to be detected; determining a second light intensity perpendicular to a direction of the light to be detected based on the first light intensities.

10. The method of claim 9, wherein, The light intensity detection device comprises three light intensity sensors, the light-receiving surfaces of the light intensity sensors are arranged on mutually perpendicular planes, and the determination of the second light intensity perpendicular to the direction of the light to be detected based on the first light intensities comprises: taking a sum of the first light intensities as the second light intensity.

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