Light intensity detection device and method

Abstract

The invention provides 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 a light path of to-be-detected light, and each light intensity sensor is provided with a light sensing surface for receiving the to-be-detected light; wherein the light intensity detection device is configured to determine second illumination intensity perpendicular to the direction of the to-be-detected light based on first illumination intensity obtained by detecting the to-be-detected light through the light intensity sensors. According to the device, the illumination intensity of light is detected by using the plurality of light intensity sensors, so that the light intensity error detected by a single light intensity detector can be reduced.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of optical technology, and in particular to a light intensity detection device and method. Background Art

[0002] A light intensity sensor is a sensor used to measure the intensity of light or the amount of radiation. Light intensity sensors are able to convert the intensity or amount of light into electrical signals or other measurable forms for recording, monitoring or control. These sensors are widely used in various fields, including but not limited to solar power generation systems, lighting control systems, environmental monitoring and optical communications. There are many types and working principles of light intensity sensors, including photodiodes, photoresistors, photocells and photodetectors. These sensors can measure the intensity of light in different wavelength ranges such as visible light, ultraviolet light, infrared light, etc., with different sensitivities and response characteristics. Through light intensity sensors, quantitative data about light intensity can be obtained, so as to monitor, control and optimize lighting conditions.

[0003] At present, when detecting the light intensity of light, a light intensity sensor is usually used for detection. For example, when detecting the light intensity of backflowing sunlight on a head-up display, a light intensity sensor is usually used for measurement. However, when the direction of the backflowing sunlight is not perpendicular to the light intensity sensor, the measurement value of the light intensity sensor cannot represent the actual sunlight intensity perpendicular to the direction of sunlight, resulting in errors in the sunlight intensity output by the light intensity sensor. Summary of the invention

[0004] The embodiment of the present invention provides a light intensity detection device and method, which can reduce the light intensity error detected by a single light intensity detector by using multiple light intensity sensors to detect the light intensity of light.

[0005] In a first aspect, an embodiment of the present invention provides a light intensity detection device, which includes: at least three light intensity sensors; each of the light intensity sensors is arranged on the optical 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 a first light intensity detected by each of the light intensity sensors for the light to be detected.

[0006] In some embodiments, the planes where the photosensitive surfaces of the light intensity sensors are located are perpendicular to each other.

[0007] In some embodiments, the planes where the photosensitive surfaces of the light intensity sensors are located are not perpendicular to each other.

[0008] In some embodiments, the light intensity detection device also includes a shell; the shell has multiple 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 photosensitive surface of each light intensity sensor is arranged on the corresponding side.

[0009] In some embodiments, the side surface is an inner side surface or an outer side surface of the shell.

[0010] In some embodiments, the central axis of the housing is parallel to the direction of the light to be detected.

[0011] In some embodiments, the photosensitive surfaces of the light intensity sensors are equal in area.

[0012] In some embodiments, the number of the light intensity sensors is three.

[0013] In a second aspect, an embodiment of the present invention provides a light intensity detection method, which is applied to a light intensity detection device as described in any one of the first aspects, and the light intensity detection method includes: obtaining a first light intensity detected by each of the light intensity sensors for the light to be detected; based on each of the first light intensities, determining a second light intensity perpendicular to the direction of the light to be detected.

[0014] In some embodiments, the light intensity detection device includes three light intensity sensors, and the planes where the photosensitive surfaces of the light intensity sensors are located are perpendicular to each other. Based on the first light intensities, a second light intensity perpendicular to the direction of the light to be detected is determined, including: taking the sum of the first light intensities as the second light intensity.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: Different from the prior art, the embodiments of the present invention provide a light intensity detection device and method, the light intensity detection device comprising: at least three light intensity sensors; each light intensity sensor is arranged on the optical path of the light to be detected, and each light intensity sensor 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 light intensity sensor for the light to be detected. By using multiple light intensity sensors to detect the light intensity of the light, the device can reduce the light intensity error detected by a single light intensity detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements / modules and steps with the same reference numerals in the drawings are represented as similar elements / modules and steps. Unless otherwise specified, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1 is a structural schematic diagram of a light intensity detection device provided by an embodiment of the present invention;

[0018] Figure 2 is a structural schematic diagram of another light intensity detection device provided by an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of an equivalent geometric model provided by an embodiment of the present invention;

[0020] Figure 4 It is a flow chart of a light intensity detection method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0022] For ease of understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those generally 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 specific embodiments and are not used to limit the present application. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0023] It should be noted that, if there is no conflict, the various features in the embodiments of the present invention can be combined with each other, and all are within the scope of protection of this application. In addition, although the functional module division is performed in the device schematic, in some cases, the module division can be different from that in the device. In addition, the words "first", "second", etc. used in this article do not limit the data and execution order, but only distinguish the same items or similar items with basically the same functions and effects.

[0024] In a first aspect, an embodiment of the present invention provides a light intensity detection device, which includes: at least three light intensity sensors.

[0025] Each light intensity sensor is arranged on the optical 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 a 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.

[0026] The light intensity sensor may include devices such as photoresistors, photodiodes, optical power meters, illuminance meters, and solar irradiance meters, so that the photosensitive surface of the light intensity sensor can detect the light intensity after receiving the light.

[0027] For example, in Figure 1 In the light intensity detection device 10, the light intensity detection device 10 includes three light intensity sensors, namely, light intensity sensor 11, light intensity sensor 12 and light intensity sensor 13. By setting the three light intensity sensors in the propagation direction of the same beam of 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 setting position of each light intensity sensor to deduce and calculate the second light intensity perpendicular to the direction of the light to be detected. Among them, the light intensity detection device 10 can be equipped with a microcontroller to perform the above-mentioned process of calculating the second light intensity. Subsequently, the light intensity detection device 10 is applied to a head-up display, and the light intensity detection device 10 can be used to be set in the propagation direction of the sunlight entering the head-up display, so as to calculate the second light intensity perpendicular to the direction of the sunlight, thereby 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.

[0028] In some of the embodiments, the planes where the photosensitive surfaces of the light intensity sensors are located are perpendicular to each other, or the planes where the photosensitive surfaces of the light intensity sensors are located are not perpendicular to each other.

[0029] The photosensitive surface is the surface of the light intensity sensor for receiving the light to be detected. It is usually a plane, composed of photosensitive elements, and can sense the incident light and generate a response. In addition, the structure of each light intensity sensor is consistent, and the area of ​​the photosensitive surface of each light intensity sensor is equal.

[0030] The planes where the photosensitive surfaces of the light intensity sensors are located are perpendicular to each other, which means that the plane where the photosensitive surface of each light intensity sensor is located is perpendicular to the plane where the photosensitive surface of any other light intensity sensor is located. The planes where the photosensitive surfaces of the light intensity sensors are located are not perpendicular to each other, which means that the plane where the photosensitive surface of each light intensity sensor is located is not perpendicular to the plane where the photosensitive surface of any other light intensity sensor is located, that is, the angle between them is not 90 degrees.

[0031] It is understandable that when detecting the light intensity of light, it is usually necessary to consider the light intensity (or illumination, irradiance) of the light to be detected in the direction perpendicular to the light to be detected, rather than the light intensity of the light to be detected in the direction of the sea level or the light intensity of the light to be detected in other directions. In order to accurately measure the light intensity of the light to be detected in the direction perpendicular to the light to be detected, if a single light intensity sensor is used for measurement, when the direction of the light to be detected is not perpendicular to the photosensitive surface of the light intensity sensor, the light intensity directly measured by the light intensity sensor cannot represent the actual light intensity in the direction perpendicular to the light to be detected. In this embodiment, by making the photosensitive surfaces of each light intensity sensor perpendicular or non-perpendicular to each other, the error caused by a single light intensity sensor can be eliminated, and by obtaining the light intensity detected by each light intensity sensor and the angle between the photosensitive surface of each light intensity sensor and the direction of the light to be detected, the light intensity of the light to be detected in the direction perpendicular to the light to be detected can be calculated, which can improve the accuracy of the measurement.

[0032] In some embodiments, the light intensity detection device 10 further includes a housing having a plurality of side surfaces, the number of the side surfaces being equal to the number of the light intensity sensors, and the side surfaces corresponding to the light intensity sensors one by one, and the light-sensitive surface of each light intensity sensor being arranged on the corresponding side surface.

[0033] The housing is used to fix each light intensity sensor, and its specific shape can be set according to actual needs and is not limited here.

[0034] Specifically, Figure 1 As shown, the light intensity detection module includes a shell, a light intensity sensor 11, a light intensity sensor 12 and a light intensity sensor 13, wherein the shape of the shell can be a regular triangular pyramid, the outer side surface A1B1D1, the outer side surface A1C1D1 and the outer side surface A1B1C1 of the regular triangular pyramid are perpendicular to each other, the photosensitive surface of the light intensity sensor 11, the photosensitive surface of the light intensity sensor 12 and the photosensitive surface of the light intensity sensor 13 are respectively arranged on the three outer sides of the shell, wherein the center of the photosensitive surface of each light intensity sensor is equidistant from the bottom surface B1C1D1 of the shell, and the center of the photosensitive surface of each light intensity sensor is in the same plane and perpendicular to the bottom surface B1C1D1.

[0035] Or, if Figure 2 As shown, the outer shape of the shell can be a regular triangular pyramid without a bottom surface, and the inner side surface A2B2D2, the inner side surface A2C2D2 and the inner side surface A2B2C2 of the regular triangular pyramid are perpendicular to each other, and the photosensitive surface of the light intensity sensor 11, the photosensitive surface of the light intensity sensor 12 and the photosensitive surface of the light intensity sensor 13 are respectively arranged on the three inner side surfaces of the shell.

[0036] In this embodiment, by arranging the light intensity sensor on the housing, the position of the light intensity detection module can be conveniently set later.

[0037] In some of the embodiments, the side surface is an inner side surface or an outer side surface of the housing.

[0038] like Figure 1 As shown, each light intensity sensor is arranged on the outer side of the housing, or as Figure 2 As shown, 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 usage scenarios of the product. For example, in some applications where the sensor needs to be protected from direct influence of the external environment (such as preventing the influence of other light, or special visual requirements require hiding the sensor to improve aesthetics, etc.), the sensor can be placed on the inner side, while in applications that need to perceive the changes in the external environment lighting more directly, the outer side is a more appropriate choice. Different devices and scenarios have different requirements for the position and orientation of the light intensity sensor. The flexibility provided by this embodiment enables the product to more widely adapt to different market needs and application scenarios.

[0039] In some of the embodiments, the photosensitive surfaces of the light intensity sensors are equal in area.

[0040] The photosensitive surface is the part of the light intensity sensor that receives light signals and converts them into electrical signals (or other measurable signals). When the photosensitive surface areas of the light intensity sensors are equal, it means that they have the same physical basis when receiving light signals, that is, their sensitivity to light signals (under the same lighting conditions) should be similar in theory.

[0041] In the light intensity detection device 10 composed of multiple light intensity sensors, if the photosensitive surface areas of each light intensity sensor are not equal, then the process of calculating the second light intensity is more complicated. When the photosensitive surface areas of each sensor are equal, the calculation process can be greatly simplified and the complexity of the calculation process can be reduced.

[0042] In some embodiments, the central axis of the housing is parallel to the direction of the light to be detected.

[0043] Specifically, in Figure 1 In the shown embodiment, the central axis of the shell is a straight line between the vertex of the shell and the center of the bottom surface B1C1D1. By setting the central axis of the shell parallel to the light to be detected, and since the photosensitive surfaces of each light intensity sensor 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 that is perpendicular to the direction of the light to be detected.

[0044] For example, if the photosensitive surfaces of the light intensity sensor 11, the light intensity sensor 12 and the light intensity sensor 13 are equal in area, the photosensitive surfaces of the sensors are simplified into equilateral right triangles for the convenience of calculation, as shown in FIG. Figure 3As shown, light intensity sensor 11 is equivalent to right angle △ABC, light intensity sensor 12 is equivalent to right angle △ACD, and light intensity sensor 13 is equivalent to right angle △ABD. The three side edges 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. Connect BO and DO.

[0045] ∵BA⊥CA, BA⊥DA, CA∩DA=A,

[0046] ∴BA⊥plane ACD, and CD∈plane ACD,

[0047] ∴CD⊥BA,

[0048] Again, ∵AO⊥plane BDC, CD∈plane BDC,

[0049] ∴CD⊥AO,

[0050] ∵AO∩BA=A,

[0051] ∴CD⊥plane ABO, that is, BO⊥CD,

[0052] ∴BO is the height on the DC side.

[0053] Similarly, DO is the height on the BC side, so O is the orthocenter of △BDC. That is, in the right-angled tetrahedron ABCD, O is the orthocenter of △BCD. Extend BO and CD to intersect at point E, E is the center of CD, and we know that AE⊥CD; since AB, AC, and AD are perpendicular to each other, we can get the projection O of A on the bottom surface as the orthocenter of the bottom surface △BCD, then BE⊥CD, so:

[0054]

[0055] Then, assuming that the sensing coefficient of the light intensity sensor is α, the second light intensity in the direct direction AO of the light to be detected is

[0056]

[0057] That is, in Figure 3 In the illustrated embodiment, if the first light intensities detected by the light intensity sensor 11, the light intensity sensor 12 and the light intensity sensor 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 which is perpendicular to the direction of the light to be detected is I=x+y+z.

[0058] In this embodiment, the measurement is performed using a method of multiple sensors, which can reduce the error caused by a single light intensity sensor, and the process of calculating the second light intensity can be simplified by adjusting the location of each light intensity sensor.

[0059] In a second aspect, an embodiment of the present invention provides a light intensity detection method, see Figure 4 The light intensity detection method is applied to the light intensity detection device 10 as in any one of the first aspect, and the light intensity detection method comprises the following steps:

[0060] Step S10: obtaining a first light intensity detected by each light intensity sensor on the light to be detected.

[0061] The executor of the light intensity detection method can be a control device set inside the light intensity detection device 10 or an external control device, and the control device includes at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor so that at least one processor can execute the method described in this embodiment. The specific model can be set according to actual needs and is not limited here.

[0062] Specifically, each light intensity sensor may be electrically connected to each other through the control device, so that each light intensity sensor can obtain the first light intensity detected by each light intensity sensor.

[0063] Step S20: Based on each first light intensity, determine a second light intensity perpendicular to the direction of the light to be detected.

[0064] After obtaining each first light intensity, the second light intensity may be calculated based on the area of ​​the photosensitive surface of each light intensity sensor and the angle between each light intensity sensor and the direction of the light to be detected.

[0065] Specifically, in Figure 1 In the illustrated embodiment, the light intensity detection device 10 includes three light intensity sensors, and the planes where the photosensitive surfaces of the light intensity sensors are located are perpendicular to each other. Step S20 includes: taking the sum of the first light intensities as the second light intensity, that is, adding the first light intensities to obtain the second light intensity.

[0066] In this embodiment, the second light intensity perpendicular to the direction of the light to be detected can be determined in the above manner. Compared with the method of using one light intensity sensor for detection, this embodiment can improve the accuracy of light intensity detection.

[0067] It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0068] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology 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 ROM / RAM, a disk, an optical disk, etc., including a number of instructions to use at least one computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light intensity detection device, characterized in that: include: At least three light intensity sensors; Each of the light intensity sensors is arranged on the optical 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 a first light intensity detected by each of the light intensity sensors on the light to be detected.

2. The light intensity detection device according to claim 1, characterized in that: The planes where the photosensitive surfaces of the light intensity sensors are located are perpendicular to each other.

3. The light intensity detection device according to claim 1, characterized in that: The planes where the photosensitive surfaces of the light intensity sensors are located are not perpendicular to each other.

4. The light intensity detection device according to any one of claims 1 to 3, characterized in that: The light intensity detection device also includes a housing; The shell has a plurality of side surfaces, the number of the side surfaces is equal to the number of the light intensity sensors, and the side surfaces correspond to the light intensity sensors one by one, and the photosensitive surface of each light intensity sensor is arranged on the corresponding side surface.

5. The light intensity detection device according to claim 4, characterized in that: The side surface is an inner side surface or an outer side surface of the shell.

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

7. The light intensity detection device according to any one of claims 1 to 3, characterized in that: The photosensitive surfaces of the light intensity sensors are equal in area.

8. The light intensity detection device according to any one of claims 1 to 3, characterized in that: The number of the light intensity sensors is three.

9. A light intensity detection method, characterized in that: Applied to the light intensity detection device according to any one of claims 1 to 6, the light intensity detection method comprises: Acquire a first light intensity detected by each of the light intensity sensors upon detecting the light to be detected; Based on each of the first light intensities, a second light intensity perpendicular to the direction of the light to be detected is determined.

10. The detection method according to claim 9, characterized in that: The light intensity detection device comprises three light intensity sensors, the planes where the photosensitive surfaces of the light intensity sensors are located are perpendicular to each other, and the second light intensity perpendicular to the direction of the light to be detected is determined based on the first light intensity, including: The sum of the first light intensities is taken as the second light intensity.

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