An Omnidirectional Optical Half-Wave Dipole Design Method and System

Abstract

An omnidirectional optical half-wave dipole design method and system, comprising: based on the requirements of spot symmetry and continuity, arranging multiple light-emitting units in a rotationally symmetric geometric layout, determining the minimum number of units by restricting the maximum azimuthal angle interval between adjacent units not to exceed a preset threshold, so that the superimposed spot approaches a circle; introducing a spot uniformity quantization evaluation mechanism, generating a dynamic evaluation index by calculating the ratio of the spot area to the perimeter, and optimizing the number of units and the arrangement method in real time; combining the divergence characteristics of the light-emitting units, simulating the spot distribution curves under different arrangements, and determining the optimal radiation array configuration by iteratively adjusting the parameters until the evaluation index reaches a preset range. The present invention solves the problem of strict alignment in traditional optical communication, supports parallel reception by multiple terminals, and has significant advantages in providing uniform illumination, improving the stability of mobile communication, ensuring electromagnetic compatibility, and realizing energy feeding, etc.

Description

Technical Field

[0001] The present invention relates to the technical fields of lighting and wireless optical communication, and particularly to an omnidirectional optical half-wave dipole design method and system. Background Art

[0002] Wireless optical communication has attracted much attention due to its high data transmission rate and low transmission delay. However, the highly directional nature of optical signals makes the alignment problem a major obstacle in practical applications. To overcome this problem, various auxiliary alignment techniques have been proposed and applied, such as using cameras and optoelectronic components (such as PIN diodes) to achieve automatic alignment. These techniques determine the relative position between a moving target and a fixed base station through communication, and then calculate the actual position of the target. However, these auxiliary alignment schemes have obvious limitations: firstly, when the target moves at a high speed and the response time of the pan-tilt adjustment is limited, both the real-time performance and accuracy of alignment will be affected; secondly, the traditional point-to-point communication method is difficult to meet the needs of simultaneous access by multiple users, and at the same time, it cannot effectively integrate the lighting and communication functions. At present, there has not yet appeared a simple and easy-to-implement scheme that can simultaneously achieve alignment, multi-user support, and lighting communication integration.

[0003] It should be noted that the information disclosed in the above background art section is only for understanding the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] The main object of the present invention is to provide an omnidirectional optical half-wave dipole design method and system, which overcomes the problems in the prior art such as strict alignment requirements for wireless optical communication, uneven lighting, inability to support multiple users, complex device system structure, and high usage cost.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An omnidirectional optical half-wave dipole design method, comprising the following steps:

[0007] S1. Omnidirectional optical radiation array design: Based on the symmetry and continuity requirements of the target light spot, a plurality of light-emitting units are arranged in a rotationally symmetric geometric layout, and by restricting the maximum azimuth angle interval between adjacent light-emitting units not to exceed a preset threshold, the minimum number of light-emitting units is determined, so that the superimposed light spot envelope approaches a circular shape;

[0008] S2. Quantification and evaluation of light spot uniformity: By calculating the ratio of the area to the perimeter of the light spot shape, a quantification evaluation index is generated to dynamically characterize the degree of approximation of the light spot to an ideal circle, and the number and arrangement of light-emitting units are optimized according to the evaluation index;

[0009] S3. Optical radiation parameter verification: Based on the divergence characteristics of the light-emitting units, simulate the spot distribution curves for different numbers of arrangements. By iteratively adjusting the number and layout of the light-emitting units until the quantization evaluation index reaches the preset optimization range, determine the final omnidirectional radiation array configuration.

[0010] Further, in step S1, the rotationally symmetric geometric layout is achieved in the following manner:

[0011] Based on the radiation divergence angle of each light-emitting unit, establish a Lambert radiation model for the attenuation of its luminous intensity with the emission angle, and determine the minimum number of light-emitting units by restricting the azimuth angle interval between adjacent light-emitting units to not exceed half of the radiation divergence angle.

[0012] Further, in step S2, the generation of the quantization evaluation index specifically includes:

[0013] For the superimposed spot envelope, calculate the total irradiance of each light-emitting unit at the target measurement point, where the irradiance of a single light-emitting unit is jointly determined by the emission angle attenuation function in its Lambert radiation model and the inverse square relationship of the distance, and dynamically characterize the optimization direction of the spot shape through the ratio of the area to the perimeter.

[0014] Further, in step S3, the optical radiation parameter verification specifically includes:

[0015] According to the Lambert radiation model, simulate the irradiance distribution curves of spots for different numbers of light-emitting units. By iteratively adjusting the number and azimuth angle interval, make the quantization evaluation index approach the preset threshold, and finally obtain the symmetric layout parameters of the omnidirectional radiation array.

[0016] Further, in step S1, the rotationally symmetric geometric layout is achieved in the following manner:

[0017] Arrange the light-emitting units in a regular polygon geometric structure, and by adjusting the number of light-emitting units, make the radii of the inscribed circle and the circumscribed circle of the spot envelope approach each other, thereby improving the circularity of the spot;

[0018] Among them, the minimum number of light-emitting units is determined by the following constraint conditions:

[0019] (a) The light-emitting unit array needs to satisfy the rotationally symmetric distribution to eliminate the non-uniformity of the spot shape;

[0020] (b) The azimuth angle interval between adjacent light-emitting units needs to be less than the characteristic threshold corresponding to the radiation divergence angle of the light-emitting unit to avoid the discretization effect of the spot envelope.

[0021] In step S3, the optical radiation parameter verification further includes:

[0022] Dynamically optimize the number of light-emitting units according to the relationship between the regular polygon geometric structure and the radius of the light spot envelope, so that the irradiance distribution curve of the light spot gradually approaches an ideal circle.

[0023] Further, in step S2, the calculation of the quantitative evaluation index specifically includes:

[0024] Generate a normalized roundness value based on the ratio of the area of the light spot envelope to the square of the perimeter, and judge the optimization direction of the light spot shape by dynamically comparing the roundness value with a preset ideal threshold;

[0025] Among them, the closer the roundness value is to 1, the closer the light spot envelope is to an ideal circle, and the roundness value shows a non-linear growth trend with the increase in the number of light-emitting units.

[0026] Further, in step S1, the determination of the minimum number of light-emitting units further includes:

[0027] According to the radiation divergence angle characteristics of the light-emitting units, simulate the change curve of the light spot roundness at different arrangement numbers through simulation, and select the number of light-emitting units corresponding to the significant decrease in the growth rate of the roundness value as the optimal configuration;

[0028] Among them, the critical point of the significant decrease in the growth rate of the roundness value is dynamically calibrated by analyzing the correlation between the light spot symmetry and the arrangement number.

[0029] Further, in step S3, the simulation verification specifically includes:

[0030] Establish a mapping relationship model between the light spot roundness and the number of light-emitting units for different radiation divergence angle characteristics, and make the roundness value reach a preset optimization interval by iteratively adjusting the number of light-emitting units and the azimuth angle interval between adjacent light-emitting units;

[0031] Among them, in the mapping relationship model, the light spot roundness shows a change law of first rising rapidly and then tending to saturation with the increase in the number of light-emitting units, and the optimization interval is determined according to the starting point of the saturation region.

[0032] Further, when the preset half-power divergence angle of the light-emitting unit is 60 degrees, the light-emitting unit array is composed of at least twelve light-emitting units, arranged in a regular polygon geometric structure with the number of sides equal to the number of light-emitting units, and the azimuth angle interval between adjacent light-emitting units is less than or equal to 30 degrees. When the preset half-power divergence angle of the light-emitting unit is 180 degrees, the light-emitting unit array is composed of at least six light-emitting units, arranged in a regular polygon geometric structure with the number of sides equal to the number of light-emitting units, and the azimuth angle interval between adjacent light-emitting units is less than or equal to 60 degrees.

[0033] Further, the light-emitting unit is an LED.

[0034] An omnidirectional optical half-wave dipole system includes a light-emitting unit array module, which is formed by uniformly arranging multiple light-emitting units in a circular array. Its geometric layout is dynamically configured into one of the following two modes according to a preset half-power divergence angle:

[0035] When the preset half-power divergence angle of the light-emitting unit is 60 degrees, the light-emitting unit array is composed of at least twelve light-emitting units, arranged in a regular polygon geometric structure with the number of sides equal to the number of light-emitting units, and the azimuth interval between adjacent light-emitting units is less than or equal to 30 degrees;

[0036] When the preset half-power divergence angle of the light-emitting unit is 180 degrees, the light-emitting unit array is composed of at least six light-emitting units, arranged in a regular polygon geometric structure with the number of sides equal to the number of light-emitting units, and the azimuth interval between adjacent light-emitting units is less than or equal to 60 degrees.

[0037] Furthermore, the light-emitting unit is an LED.

[0038] The present invention has the following beneficial effects:

[0039] The present invention proposes an omnidirectional optical half-wave dipole design method and system, which is applied to wireless optical communication. Through the rotationally symmetric LED array layout and optimized spot uniformity control technology, it effectively solves the alignment problem caused by the high directivity of traditional optical signals, and significantly improves the communication stability and transmission efficiency in mobile scenarios. The system uses pulse modulation signals in the visible light band for information transmission, realizes high-speed communication while ensuring lighting quality, and converts the energy in the received signal into power supply for terminal devices through an energy recovery function, significantly improving energy efficiency and reducing dependence on traditional power supply methods. The omnidirectional radiation design not only supports parallel reception of multiple terminals, enhances the concurrent communication ability of the system, but also has excellent anti-interference performance, and can resist local occlusion and angular deviation in complex environments to ensure stable communication quality. In addition, this solution avoids the risk of electromagnetic radiation, maintains the electromagnetic compatibility of the system, has both dynamic lighting performance and multifunctional integration characteristics, is applicable to various scenarios such as indoors, cities, and underwater, and provides an efficient, reliable and environmentally friendly communication and power supply integrated solution for intelligent terminals.

[0040] Specifically, the technical advantages of the present invention are mainly reflected in the following aspects:

[0041] (1) Omnidirectional radiation can evenly distribute optical signals in a large range, eliminating the need for strict alignment between the transmitting end and the receiving end, so that even when the position of the user or device changes, the effective reception of the signal can be ensured;

[0042] (2)Omnidirectional light simulates uniform solar radiation. Since its flicker frequency is much higher than the human eye's perception range (above 1 kHz for example), the lighting and communication functions do not affect the lighting quality, and it has superior dynamic lighting performance compared with traditional energy-saving lamps.

[0043] (3)Since omnidirectional light can cover a wide area, the same light source can emit signals in multiple directions simultaneously, thus supporting parallel reception by multiple terminal devices, greatly enhancing the system's concurrent communication ability and application flexibility.

[0044] (4)Using pulse modulation signals in the visible light frequency band does not generate electromagnetic interference, which is conducive to maintaining good electromagnetic compatibility. While achieving communication and lighting, it effectively feeds power to various terminal devices by extracting the energy in the received signals, thus replacing the inconvenience brought by traditional wired or battery power supply, reducing the volume and cost of terminal devices, and greatly extending their standby time.

[0045] (5)The omnidirectional radiation design can effectively resist local occlusion, angular deviation, and environmental interference, thereby enhancing the overall stability and reliability of the system, and is especially suitable for use in dynamic or complex environments.

[0046] (6)In indoor, urban, underwater, or other environments, since the receivers may be at various angles, omnidirectional transmission can ensure that no matter how the receivers are placed, they can receive signals with sufficient intensity, ensuring that the communication quality does not fluctuate significantly due to environmental changes.

[0047] Other beneficial effects in the embodiments of the present invention will be further described below. Description of the Drawings

[0048] Figures 1A to 1C It is a schematic diagram of the light intensity cross-section distribution curve for different numbers n of LED arrangements.

[0049] Figure 2 It is a schematic diagram of the geometric relationship between LEDs and measurement points in the present invention;

[0050] Figure 3 It is a schematic diagram of the positional relationship between the multi-LED arrangement and the measurement points in the present invention;

[0051] Figure 4 For Figure 3 The light intensity distribution diagram generated by the LED arrangement shown on the hemispherical surface;

[0052] Figure 5 It is a cross-section light intensity roundness curve diagram for different numbers of LED arrangements.

[0053] Figure 6 It is a flowchart of the method in the embodiments of the present invention. Detailed Embodiments

[0054] The following provides a detailed description of the embodiments of the present invention. It should be emphasized that the following description is merely exemplary and not intended to limit the scope of the present invention and its applications.

[0055] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0056] Referring to Figure 6 , an omnidirectional optical half-wave dipole design method is provided in an embodiment of the present invention, including the following steps:

[0057] Step S1. Omnidirectional optical radiation array design: Based on the symmetry and continuity requirements of the target light spot, a plurality of light-emitting units (such as light-emitting diodes (LEDs)) are arranged in a rotationally symmetric geometric layout, and by restricting the maximum azimuth angle interval between adjacent light-emitting units not to exceed a preset threshold, the minimum number of light-emitting units is determined so that the superimposed light spot envelope approaches a circular shape;

[0058] Step S2. Quantification and evaluation of light spot uniformity: By calculating the ratio of the area to the perimeter of the light spot shape, a quantitative evaluation index is generated to dynamically characterize the degree of approximation of the light spot to an ideal circle, and the number and arrangement of light-emitting units are optimized according to the evaluation index;

[0059] Step S3. Verification of optical radiation parameters: Based on the divergence characteristics of the light-emitting units, the light spot distribution curves under different arrangement numbers are simulated, and by iteratively adjusting the number and layout of the light-emitting units until the quantitative evaluation index reaches a preset optimization range, the final omnidirectional radiation array configuration is determined.

[0060] In some embodiments, in step S1, the rotationally symmetric geometric layout is achieved in the following manner: Based on the radiation divergence angle of each light-emitting unit, a Lambert radiation model of the attenuation of its luminous intensity with the emission angle is established, and by restricting the azimuth angle interval between adjacent light-emitting units not to exceed half of the radiation divergence angle, the minimum number of light-emitting units is determined.

[0061] In some embodiments, in step S2, the generation of the quantitative evaluation index specifically includes: For the superimposed light spot envelope, calculate the sum of the irradiances of each light-emitting unit at the target measurement point, where the irradiance of a single light-emitting unit is jointly determined by the emission angle attenuation function in its Lambert radiation model and the inverse square relationship of the distance, and the optimization direction of the light spot shape is dynamically characterized by the ratio of the area to the perimeter.

[0062] In some embodiments, in step S3, the verification of the optical radiation parameters specifically includes: according to the Lambert radiation model, simulating the irradiance distribution curve of the light spot under different numbers of light-emitting units, and by iteratively adjusting the number and the azimuth angle interval, making the quantization evaluation index approach a preset threshold, and finally obtaining the symmetric layout parameters of the omnidirectional radiation array.

[0063] In some embodiments, in step S1, the rotationally symmetric geometric layout is achieved in the following manner: arranging the light-emitting units in a regular polygon geometric structure, and by adjusting the number of light-emitting units, making the radii of the inscribed circle and the circumscribed circle of the light spot envelope approach each other, so as to improve the circularity of the light spot; wherein, the minimum number of light-emitting units is determined by the following constraint conditions: (a) the light-emitting unit array needs to satisfy the rotationally symmetric distribution to eliminate the non-uniformity of the light spot shape; (b) the azimuth angle interval between adjacent light-emitting units needs to be less than the characteristic threshold corresponding to the radiation divergence angle of the light-emitting unit to avoid the discretization effect of the light spot envelope.

[0064] In some embodiments, in step S3, the verification of the optical radiation parameters further includes: according to the radius relationship between the regular polygon geometric structure and the light spot envelope, dynamically optimizing the number of light-emitting units to make the irradiance distribution curve of the light spot gradually approach an ideal circle.

[0065] In some embodiments, in step S2, the calculation of the quantization evaluation index specifically includes: generating a normalized circularity value based on the ratio of the area of the light spot envelope to the square of the perimeter, and by dynamically comparing the circularity value with a preset ideal threshold, judging the optimization direction of the light spot shape; wherein, the closer the circularity value is to 1, the closer the light spot envelope is to an ideal circle, and the circularity value shows a non-linear growth trend with the increase in the number of light-emitting units.

[0066] In some embodiments, in step S1, the determination of the minimum number of light-emitting units further includes: according to the radiation divergence angle characteristics of the light-emitting unit, simulating the light spot circularity change curve under different arrangement numbers through simulation, and selecting the number of light-emitting units corresponding to the significant decrease in the growth rate of the circularity value as the optimal configuration; wherein, the critical point of the significant decrease in the growth rate of the circularity value is dynamically calibrated by analyzing the correlation between the light spot symmetry and the arrangement number.

[0067] In some embodiments, in step S3, the simulation verification specifically includes: establishing a mapping relationship model between the spot roundness and the number of light-emitting units for different radiation divergence angle characteristics, and iteratively adjusting the number of light-emitting units and the azimuth angle interval between them to make the roundness value reach a preset optimization interval; wherein, in the mapping relationship model, the spot roundness first rapidly increases and then tends to saturate with the increase in the number of light-emitting units, and the optimization interval is determined according to the starting point of the saturation region.

[0068] In some embodiments, when the preset half-power divergence angle of the light-emitting unit is 60 degrees, the light-emitting unit array is composed of at least twelve light-emitting units, arranged in a regular polygon geometric structure with the number of sides equal to the number of light-emitting units, and the azimuth angle interval between adjacent light-emitting units is less than or equal to 30 degrees. In other embodiments, when the preset half-power divergence angle of the light-emitting unit is 180 degrees, the light-emitting unit array is composed of at least six light-emitting units, arranged in a regular polygon geometric structure with the number of sides equal to the number of light-emitting units, and the azimuth angle interval between adjacent light-emitting units is less than or equal to 60 degrees.

[0069] An embodiment of the present invention further provides an omnidirectional optical half-wave dipole system, including a light-emitting unit array module, which is formed by uniformly arranging a plurality of light-emitting units (such as LEDs) in a circular array, and its geometric layout is dynamically configured into one of the following two modes according to the preset half-power divergence angle:

[0070] When the preset half-power divergence angle of the light-emitting unit is 60 degrees, the light-emitting unit array is composed of at least twelve light-emitting units, arranged in a regular polygon geometric structure with the number of sides equal to the number of light-emitting units, and the azimuth angle interval between adjacent light-emitting units is less than or equal to 30 degrees;

[0071] When the preset half-power divergence angle of the light-emitting unit is 180 degrees, the light-emitting unit array is composed of at least six light-emitting units, arranged in a regular polygon geometric structure with the number of sides equal to the number of light-emitting units, and the azimuth angle interval between adjacent light-emitting units is less than or equal to 60 degrees.

[0072] The following further describes specific embodiments of the present invention, its algorithm examples, and experimental verification.

[0073] An omnidirectional optical half-wave dipole method and system specifically include the following steps:

[0074] (1) Emission model of a single LED

[0075] The emission intensity of a single LED generally follows the Lambert model, and its emission intensity distribution can be expressed as:

[0076]

[0077] Where is the angle between the outgoing light ray and the normal of the LED, is the luminous intensity in the normal direction. The constant m is the order of the Lambert source, which is determined by the divergence angle of the LED:

[0078]

[0079] where is the full-width at half-maximum divergence angle of the LED, then formula (1) can be expressed as:

[0080]

[0081] (2) Irradiance of the LED at the measurement point

[0082] Since the LED is a Lambert source, its luminous intensity is only related to the polar angle and has nothing to do with the azimuth angle . The light intensity is inversely proportional to the square of the distance, that is . Therefore, the light intensity measured at point can be expressed as:

[0083]

[0084] (3) Calculation of irradiance of multiple LEDs at the measurement point

[0085] When n identical LEDs act together on the space point , the total light intensity is the linear superposition of the individual contributions of each LED. At this time, the total light intensity at point can be expressed as:

[0086]

[0087] where is the light intensity formed by the LED chip numbered i at this point.

[0088] (4) Omnidirectional optical half-wave dipole design

[0089] Under the Lambert source model, if all LEDs are arranged at the same position and in the same direction, then regardless of n taking any value, the shape of the superimposed light spot is exactly the same as that of a single LED, only the intensity is enhanced. At this time, the circularity of the light spot is determined by the divergence angle of a single LED and has nothing to do with n .

[0090] However, when the LEDs are arranged in a circular array or other symmetric ways, increasing nThe symmetry of the light spot can be improved. At this time, the light spot approaches a circular shape, and a more ideal light spot shape can be obtained by optimizing the LED arrangement.

[0091] Conditions for the optimal symmetry of the light spot

[0092] To obtain a light spot closest to an ideal circle, the LED arrangement should meet the following two conditions:

[0093] 1. Symmetry requirement: The geometric distribution of the LED array needs to satisfy rotational symmetry to reduce the non-uniformity of the light spot shape.

[0094] 2. Minimum spacing constraint: The spacing between LEDs should be less than the characteristic size of the light spot to avoid the discretization effect and thus improve the continuity of the light spot envelope.

[0095] Under the condition of meeting the above conditions, the optimal number of LED arrangements can be expressed as:

[0096]

[0097] where is the minimum azimuthal angle interval between LEDs and needs to satisfy . n The value of should consider the LED divergence angle

[0098] to optimize the optical uniformity.

[0099] There is n When there are n LEDs and these LEDs are arranged in the shape of a regular r -sided polygon, the envelope of its light spot is closest to a circle, and the radius R of its inscribed circle and the radius

[0100]

[0101] When n gradually increases and approaches infinity, the regular polygon gradually approaches a circle. At this time, the radius r of the inscribed circle and the radius R of the circumscribed circle are equal, that is, the envelope of the optical radiation is an ideal circle.

[0102] (5)Omnidirectional light spot shape evaluation criteria

[0103] In practical applications, due to the number of LED arrangements nIt is impossible to approach infinity, and the generated optical radiation still has deviations, so it is necessary to quantify the shape of the light spot. Usually, roundness is used to measure the degree of closeness of the light spot to the ideal circle, which is defined as follows:

[0104]

[0105] in is the spot shape area, P is the spot envelope circumference, the closer the roundness is to 1, the closer the spot is to the ideal circle. n As it increases, the roundness of the light spot gradually increases, approaching the ideal circle.

[0106] (6) Calculation

[0107] Assume LED half-power divergence angle ,but

[0108]

[0109] That is, when the LEDs are arranged in a regular dodecagon, the light spot is closest to a circle.

[0110] Example

[0111] The geometric relationship diagram of the LED chip and the measurement point is as follows Figure 2 As shown, LED is an incoherent light source, and the intensity of the light emitted by multiple LED chips can be directly added after being superimposed on each other. The light emission of a single LED chip conforms to the model of Lambertian light source, and its luminous intensity distribution can be expressed as:

[0112]

[0113] in is the angle between the outgoing light and the normal of the LED chip, is the luminous intensity in the normal direction. The constant m is the order of the Lambertian light source, which is determined by the divergence angle of the LED chip:

[0114]

[0115] in It is the half-power full-width divergence angle of the LED chip.

[0116] The relationship between the multiple LED arrangement and the measurement point is as follows: Figure 3 As shown, this figure is only used as an example. When calculating the light intensity distribution of different LED chip arrangements, different geometric relationships should be used for calculation. Figure 3 In, at point Measured light intensity The superposition of light emitted by 9 LED chips:

[0117]

[0118] where is the light intensity formed by the LED chip numbered n at this point. Since the radiation distribution characteristic of a Lambertian source is rotationally symmetric, the light intensity is independent of the angle , that is:

[0119]

[0120] can be obtained according to geometric relationships

[0121]

[0122] where i and j are the serial numbers of the LED chips in the high-power LED package, indicating that the LED chip is located in the i th row and the j th column. and respectively represent the positions of the LED chip relative to the central LED chip, , , in millimeters.

[0123] Substituting formulas (4) and (5) into (3), the light intensity at point can be obtained as:

[0124]

[0125] According to formula (6), the normalized light intensity distribution of the LED chip group on the unit sphere can be calculated, as shown in Figure 4 . The light intensity distribution of this LED package is still generally similar to the Lambertian source law. However, due to the rectangular arrangement of the LED chips, the light intensity distribution at some positions shows rectangular characteristics, with a certain difference from the ideal circle.

[0126] When there are n LEDs, in order to obtain the light spot shape closest to the ideal circle, the LED arrangement should meet the following two conditions:

[0127] 1. Symmetry requirement: The geometric distribution of the LED array needs to satisfy rotational symmetry to ensure the uniformity of the radiation distribution.

[0128] 2. Minimum spacing constraint: The spacing between LEDs should be less than the characteristic size of the light spot to avoid the discretization effect and thus improve the continuity of the light spot envelope.

[0129] Under the condition of meeting the above conditions, the optimal number of LED arrangements can be expressed as:

[0130]

[0131] wherein is the minimum azimuthal angle interval between LEDs, and it is necessary to satisfy . n The value of should consider the LED divergence angle

[0132] When the LEDs are arranged in a circular array or other symmetric ways, increasing n can improve the symmetry of the light spot. In practical applications, since the number of LED arrangements n cannot tend to infinity, there are still deviations in the optical radiation generated, so it is necessary to quantitatively evaluate the light spot shape. Usually, roundness is used to measure the degree of approximation of the light spot to an ideal circle, and its definition is as follows:

[0133]

[0134] wherein is the area of the light spot shape, P is the perimeter of the light spot envelope, and the closer the roundness is to 1, the closer the light spot is to an ideal circle. When n increases, the roundness of the light spot gradually increases and approaches an ideal circle.

[0135] According to the above calculation method, LEDs with a half-power divergence angle are used to simulate the light intensity cross-section distribution curve and the roundness of the curve under different numbers n of LED arrangements respectively. The LED positions are located at the midpoints of each side of a regular polygon. As Figures 1A to 1C shown, the distribution of the cross-section light intensity in the cases of n = 1 to 6 is obtained respectively, and it can be found that when n gradually increases, the roundness of the cross-section light intensity distribution gradually increases.

[0136] As Figure 5 shown, analyzing the cross-section light intensity roundness curves of different numbers n of LED arrangements, when n increases from 3 to 6, the roundness of the cross-section light intensity rises very rapidly. When n = 6, its roundness is 0.9851, which is very close to an ideal circle. When n increases from 7 to 12, the curve flattens out, and at this time, increasing the number of LED arrangements has little effect on the increase of roundness. Therefore, it can be concluded that in the case of a half-power divergence angle , considering the symmetry of the light spot and the light spot shape comprehensively, n = 6 is approximately the optimal number of LED arrangements.

[0137] In summary, the present invention proposes an omnidirectional optical half-wave dipole design method and system, effectively overcoming the problems in the prior art such as strict alignment requirements in wireless optical communication, uneven illumination, inability to support multiple users, complex device system structure, and high usage cost. Embodiments of the present invention can achieve optical radiation characteristics similar to those of a half-wave dipole through different numbers of light-emitting diode (LED) modules and different-shaped base units. The present invention can not only simulate the uniform illumination effect like the sun, but also effectively solve the problem of traditional alignment difficulties in wireless optical communication, thus significantly improving the communication stability and transmission efficiency in mobile scenarios.

[0138] Specifically, the system uses a visible light band pulse modulation signal for information transmission. Since its frequency is much higher than the human eye perception range (for example, above 1 kHz), while realizing the communication function, it will not cause any interference to the lighting quality. In addition, since this modulation signal does not generate electromagnetic radiation problems, it helps to maintain the excellent electromagnetic compatibility of the system and avoids the risk of electromagnetic pollution that may be caused by traditional radio frequency communication.

[0139] Furthermore, the present invention also has an energy recovery function, that is, during the process of realizing illumination and communication, by effectively extracting the energy in the received signal, it can provide power support to various terminal devices. This characteristic not only improves the overall energy efficiency of the system, but also expands the application prospect of wireless optical communication in the power supply of intelligent terminals.

[0140] The omnidirectional optical half-wave dipole method and system of the present invention have significant advantages in providing uniform illumination, improving mobile communication stability, ensuring electromagnetic compatibility, and realizing energy feeding. Compared with traditional lighting products such as energy-saving lamps, its dynamic lighting performance and multi-functional integration are more excellent.

[0141] The technical advantages of the present invention are mainly reflected in:

[0142] (1) Omnidirectional radiation can evenly distribute optical signals in a large range, eliminating the need for strict alignment between the transmitter and the receiver, so that even when the position of the user or device changes, the effective reception of the signal can be ensured;

[0143] (2) Omnidirectional light simulates the uniform radiation of the sun, and since its flicker frequency is much higher than the human eye perception range (such as above 1 kHz), the illumination and communication functions do not affect the lighting quality, and it has more excellent dynamic lighting performance compared with traditional energy-saving lamps;

[0144] (3) Since omnidirectional light can cover a wide area, the same light source can simultaneously transmit signals in multiple directions, thus supporting the parallel reception of multiple terminal devices, greatly improving the concurrent communication ability and application flexibility of the system;

[0145] (4)Adopt visible light band pulse modulation signals, which do not generate electromagnetic interference and are conducive to maintaining good electromagnetic compatibility. While realizing communication and lighting, effectively feed power to various terminal devices by extracting the energy in the received signals, thus replacing the inconvenience brought by traditional wired or battery power supply, reducing the volume and cost of terminal devices, and greatly extending their standby time.

[0146] (5)The omnidirectional radiation design can effectively resist local occlusion, angular deviation and environmental interference, thus enhancing the overall stability and reliability of the system, and is especially suitable for use in dynamic or complex environments.

[0147] (6)In indoor, urban, underwater or other environments, since the receiver may be at various angles, omnidirectional transmission can ensure that no matter how the receiver is placed, a signal with sufficient intensity can be received, ensuring that the communication quality does not fluctuate significantly due to environmental changes.

[0148] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several alternatives or modifications can be made to these described embodiments, and these alternative or modified forms should be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "preferred embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the protection scope of the patent application.

Claims

1. A method for designing an omnidirectional optical half-wave oscillator, characterized in that: The following steps are involved: S1. Omnidirectional optical radiation array design: Based on the symmetry and continuity requirements of the target light spot, multiple light-emitting units are arranged in a rotationally symmetrical geometric layout, and the minimum number of light-emitting units is determined by constraining the maximum azimuth angle interval between adjacent light-emitting units not to exceed a preset threshold, so that the envelope of the superimposed light spot approaches a circle; S2. Quantitative evaluation of light spot uniformity: by calculating the ratio of the area to the perimeter of the light spot shape, a quantitative evaluation index is generated to dynamically characterize the degree of proximity of the light spot to the ideal circle, and the number and arrangement of light-emitting units are optimized according to the quantitative evaluation index; S3. Optical radiation parameter verification: Based on the divergence characteristics of the light-emitting unit, simulate the spot distribution curve under different arrangement numbers, and iteratively adjust the number and layout of the light-emitting units until the quantitative evaluation index reaches the preset optimization range to determine the final omnidirectional radiation array configuration; In step S1, the rotationally symmetric geometric layout is achieved by: Based on the radiation divergence angle of each light-emitting unit, a Lambertian radiation model in which the luminous intensity decays with the emission angle is established, and the minimum number of the light-emitting units is determined by constraining the azimuth angle interval between adjacent light-emitting units to not exceed half of the radiation divergence angle; In step S2, the generation of the quantitative evaluation index specifically includes: For the superimposed light spot envelope, the sum of the irradiances of each light-emitting unit at the target measurement point is calculated, wherein the irradiance of a single light-emitting unit is determined by the emission angle attenuation function and the inverse square relationship of the distance in its Lambertian radiation model, and the optimization direction of the light spot shape is dynamically characterized by the ratio of the area to the perimeter; In step S3, the optical radiation parameter verification specifically includes: According to the Lambertian radiation model, the irradiance distribution curve of the light spot under different numbers of light-emitting units is simulated, and the quantitative evaluation index is made close to the preset threshold by iteratively adjusting the number of light-emitting units and the azimuth angle interval, and finally the symmetrical layout parameters of the omnidirectional radiation array are obtained.

2. The omnidirectional optical half-wave oscillator design method according to claim 1, characterized in that: In step S1, the rotationally symmetric geometric layout is achieved by: The light-emitting units are arranged in a regular polygonal geometric structure, and the radii of the inscribed circle and the circumscribed circle of the light spot envelope are made close by adjusting the number of light-emitting units, thereby improving the circularity of the light spot; The minimum number of light-emitting units is determined by the following constraints: (a) The light-emitting unit array must satisfy rotational symmetry to eliminate the unevenness of the light spot shape; (b) The azimuth angle interval between adjacent light-emitting units must be smaller than the characteristic threshold corresponding to the radiation divergence angle of the light-emitting unit to avoid the discretization effect of the light spot envelope; In step S3, the optical radiation parameter verification specifically includes: According to the relationship between the regular polygonal geometric structure and the radius of the light spot envelope, the number of light-emitting units is dynamically optimized so that the irradiance distribution curve of the light spot gradually approaches the ideal circle.

3. The omnidirectional optical half-wave oscillator design method according to claim 1, characterized in that: In step S2, the calculation of the quantitative evaluation index specifically includes: Generate a normalized roundness value based on the ratio of the area of ​​the light spot envelope to the square of the perimeter, and determine the optimization direction of the light spot shape by dynamically comparing the roundness value with a preset ideal threshold; The closer the roundness value is to 1, the closer the light spot envelope is to an ideal circle, and the roundness value shows a nonlinear growth trend with the increase in the number of light-emitting units.

4. The omnidirectional optical half-wave oscillator design method according to claim 1, characterized in that: In step S1, determining the minimum number of light-emitting units specifically includes: According to the radiation divergence angle characteristics of the light-emitting unit, the light spot roundness change curve under different arrangement numbers is simulated, and the number of light-emitting units corresponding to the significant decrease in the roundness value growth rate is selected as the optimal configuration; The critical point at which the roundness value growth rate significantly decreases is dynamically calibrated by analyzing the correlation between the spot symmetry and the arrangement quantity.

5. The omnidirectional optical half-wave oscillator design method according to claim 4, characterized in that: In step S3, the following simulation verification process is specifically included: According to the characteristics of different radiation divergence angles, a mapping relationship model between the spot roundness and the number of light-emitting units is established, and the roundness value is made to reach a preset optimization range by iteratively adjusting the number of light-emitting units and the azimuth interval; Among them, in the mapping relationship model, the circularity of the light spot shows a change rule that it first rises rapidly and then tends to saturation as the number of light-emitting units increases, and the preset optimization interval is determined according to the starting point of the saturation area.

6. The omnidirectional optical half-wave oscillator design method according to claim 1, characterized in that: When the preset half-power divergence angle of the light-emitting unit is 60 degrees, the light-emitting unit array is composed of at least twelve light-emitting units, arranged in a regular polygonal geometric structure with a number of sides equal to the number of light-emitting units, and the azimuth interval between adjacent light-emitting units is less than or equal to 30 degrees; When the preset half-power divergence angle of the light-emitting unit is 180 degrees, the light-emitting unit array is composed of at least six light-emitting units, arranged in a regular polygonal geometric structure with a number of sides equal to the number of light-emitting units, and the azimuth angle interval between adjacent light-emitting units is less than or equal to 60 degrees.

7. The method for designing an omnidirectional optical half-wave oscillator according to any one of claims 1 to 6, characterized in that: The light emitting unit is an LED.

8. An omnidirectional optical half-wave oscillator system, designed by the method of claim 1, characterized in that: The light emitting unit array module includes a plurality of light emitting units evenly arranged in a circular array, and the geometric layout thereof is dynamically configured into one of the following two modes according to a preset half-power divergence angle: When the preset half-power divergence angle of the light-emitting unit is 60 degrees, the light-emitting unit array is composed of at least twelve light-emitting units, arranged in a regular polygonal geometric structure with a number of sides equal to the number of light-emitting units, and the azimuth interval between adjacent light-emitting units is less than or equal to 30 degrees; When the preset half-power divergence angle of the light-emitting unit is 180 degrees, the light-emitting unit array is composed of at least six light-emitting units, arranged in a regular polygonal geometric structure with a number of sides equal to the number of light-emitting units, and the azimuth angle interval between adjacent light-emitting units is less than or equal to 60 degrees.

9. The omnidirectional optical half-wave oscillator system according to claim 8, characterized in that: The light emitting unit is an LED.

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