Visible light indoor position sensing data acquisition device based on array sensor

Abstract

The invention relates to the technical field of visible light indoor position sensing, in particular to a visible light indoor position sensing data acquisition device based on an array sensor, which comprises a detection plate assembly, a light source positioning assembly and a data processing module. Five photoelectric detectors are arranged on a substrate of the detection plate assembly in a specific geometric mode, and the spatial resolution and the angle correlation are improved in combination with an optical channel model. The surface of the substrate is coated with a low-reflection coating, a transparent protective cover and a miniature temperature sensor are additionally arranged, interference is reduced, and stability is ensured. The light source positioning assembly adopts a point light source and controls the luminous intensity through an adjusting circuit. And the data processing module operates a light intensity distribution modeling algorithm by using an embedded processor to generate a high-precision light intensity distribution diagram. According to the invention, the problem of data redundancy or insufficiency caused by unreasonable layout of the detector can be effectively solved, and the method is suitable for high-precision measurement requirements in a complex light environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of visible light indoor position sensing, and specifically relates to a visible light indoor position sensing data acquisition device based on an array sensor. Background Art

[0002] With the advancement of optical sensing technology, visible light indoor position sensing data acquisition devices based on array sensors are becoming increasingly important in fields such as environmental monitoring, industrial testing, and scientific research. During the light intensity data acquisition process, the arrangement of the detector array has a significant impact on the accuracy and variability of the data. Common detector layouts often use a regular arrangement, but this layout may not fully reflect the spatial distribution characteristics of light intensity under certain experimental conditions. This is especially true in complex lighting environments, where data variability and angular correlation are difficult to fully capture.

[0003] Currently, when collecting light intensity data in a three-dimensional experimental platform, detectors are typically fixed to a plate of a certain area, and measurements are taken point by point by moving the detector array. However, the existing technology lacks systematic research on the optimal arrangement of multiple detectors within a limited area, resulting in redundant or insufficient collected data. Furthermore, the establishment of optical channel models often relies on simplified assumptions and fails to fully consider the impact of light source position, detector angle, and relative position on light intensity distribution, thus limiting the model's scope of application and accuracy. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a visible light indoor position perception data acquisition device based on array sensors. By optimizing the arrangement of the detector array and constructing an accurate optical channel model in a three-dimensional experimental platform, the spatial resolution and angular correlation of light intensity data acquisition are improved, thereby solving the problem of data redundancy or insufficiency caused by unreasonable detector layout in the existing technology and improving the accuracy of light intensity distribution modeling.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a visible light indoor position sensing data acquisition device based on an array sensor, comprising a detector plate assembly, a light source positioning assembly, and a data processing module. The detector plate assembly comprises a square substrate with a side length of 5 cm, on which five photodetectors are fixedly mounted, distributed in a specific geometric arrangement on the substrate surface. The bottom side of the substrate is fixedly connected to a mobile platform via bolts. The bottom of the mobile platform is mounted with slide rails, which are arranged horizontally and connected to a drive mechanism.

[0006] The light source positioning assembly includes a point light source fixed to the center of the experimental platform. The center of the point light source is 3 meters above the experimental platform floor, and the light-emitting surface of the point light source is set downward. The luminous intensity of the point light source is controlled by a regulation circuit, which is electrically connected to the data processing module.

[0007] The data processing module includes a signal acquisition unit and a calculation unit. The signal acquisition unit is electrically connected to the five photodetectors via wires to receive the light intensity signals output by the photodetectors. The calculation unit is in communication with the signal acquisition unit to analyze the light intensity signals and generate a light intensity distribution map.

[0008] The five photodetectors are arranged on the substrate as follows: four photodetectors are located at the four corners of the substrate, and the fifth photodetector is located at the geometric center of the substrate. The photosensitive surface of each photodetector is facing upward and parallel to the plane of the substrate. The photodetectors at the four corners form a 45-degree angle with the center of the substrate, and the angle between photodetectors at two adjacent corners is 90 degrees. This arrangement results in an irregular distribution of the five photodetectors within a limited area, enhancing the angular correlation and spatial variability of data acquisition.

[0009] The substrate is coated with a 0.1mm thick black coating with a reflectivity of less than 5% to reduce interference from ambient light on the photodetector. A heat sink made of aluminum alloy is fixed to the bottom of the substrate. Its surface area is twice that of the substrate's bottom side, reducing the temperature rise of the photodetector during operation.

[0010] The mobile platform's slide rails are horizontally arranged, 4.5 meters long, and connected to the two side walls of the experimental platform via fixed brackets. A slider is mounted on the rails, bolted to the bottom of the baseplate. A stepper motor is mounted on the side of the slider, and its output shaft meshes with the slider's internal gears. The stepper motor drives the slider along the rails via an external controller.

[0011] The signal acquisition unit in the data processing module consists of five independent signal amplification circuits, each electrically connected to a photodetector. The gain of each signal amplification circuit ranges from 1 to 100 times, adjustable via an external knob. The output of the signal acquisition unit is connected to the input of the computation unit via a data line with a transmission rate of 10 megabits per second.

[0012] The computing unit consists of an embedded processor (ARM Cortex-M4) and a 16-gigabyte memory. The embedded processor runs a light intensity distribution modeling algorithm that analyzes the light intensity signal collected by the photodetector based on an optical channel model. The specific formula for the optical channel model is:

[0013]

[0014] Where I(x, y, z) represents the light intensity at the spatial coordinate (x, y, z); P0 represents the initial luminous power of the point light source; r represents the distance from the point light source to the photodetector; α represents the attenuation coefficient of light in air; θ represents the angle between the light and the normal of the photosensitive surface of the photodetector; and n represents the angle dependence index, which ranges from 1 to 4.

[0015] As a preferred embodiment of the present invention, a transparent protective cover is fixedly mounted on the top side of the substrate. The cover is made of polycarbonate and is 2 mm thick. It protects the photodetector from dust and moisture. The surface of the transparent protective cover is coated with an anti-reflection coating with a thickness of 0.05 mm to reduce light reflection losses from the protective cover.

[0016] As a preferred technical solution of the present invention, a displacement sensor is mounted on the slide rail of the mobile platform. The displacement sensor has a measurement range of 0 to 4.5 meters and an accuracy of 0.1 mm. The output of the displacement sensor is connected to the input of the data processing module via a signal line to monitor the position of the substrate on the slide rail in real time.

[0017] As a preferred technical solution of the present invention, the data processing module also includes a 7-inch display screen with a resolution of 1024×768 pixels. The display screen is connected to the data processing module housing via a hinge. The display screen displays a light intensity distribution diagram, the location of the point light source, and the real-time signal strength of the photodetector.

[0018] As a preferred technical solution of the present invention, the bottom side of the baseplate is provided with four through-holes, each 3 mm in diameter, evenly distributed at the baseplate's four corners. Stainless steel threaded sleeves with an outer diameter of 4 mm and an inner diameter of 3 mm are installed within these through-holes to enhance the connection between the baseplate and the mobile platform.

[0019] As a preferred technical solution of the present invention, the light source positioning assembly also includes a light shield. The light shield is made of black plastic and its inner wall is coated with a light-absorbing material to reduce the impact of stray light from the point light source on the experimental environment. The light shield has an opening diameter of 10 cm and a depth of 5 cm, and is positioned with the opening facing downward.

[0020] As a preferred technical solution of the present invention, a circular groove is defined in the center of the substrate, with a diameter of 1 cm and a depth of 2 mm. A micro-temperature sensor is mounted within the groove, with a measurement range of -20°C to 100°C and an accuracy of 0.1°C. The output of the micro-temperature sensor is connected to the input of the data processing module via a signal line, enabling real-time monitoring of temperature changes on the substrate surface.

[0021] As a preferred technical solution of the present invention, a limit switch is installed on the slide rail of the mobile platform. The trigger distance of the limit switch is 5 mm. The output end of the limit switch is electrically connected to the control circuit of the stepper motor to prevent the slider from exceeding the predetermined stroke on the slide rail.

[0022] As a preferred technical solution of the present invention, the data processing module also includes a wireless communication module. The wireless communication module is an ESP32 model, operates at a 2.4 GHz frequency band, and has a transmission rate of 10 megabits per second. The wireless communication module communicates with an external device via an antenna and is used to transmit the light intensity distribution map and the location information of the point light source to a remote terminal.

[0023] As a preferred technical solution of the present invention, the substrate surface is engraved with nine positioning marks, evenly distributed across the substrate surface in three rows and three columns. Each positioning mark has a diameter of 1 mm and a depth of 0.5 mm and is used to assist in the installation and calibration of the photodetector.

[0024] As a preferred technical solution of the present invention, the point light source of the light source positioning assembly uses an LED lamp bead with an emission wavelength of 550 nanometers and an emitting power of 5 watts. The LED lamp bead is supplied with a voltage of 12 volts and a current of 500 milliamperes, and has a service life of 50,000 hours.

[0025] Through the above technical solution, the optimized arrangement of the five photodetectors on the substrate significantly improves the angular correlation and spatial variability of light intensity data acquisition. The introduction of the optical channel model also enhances the accuracy of light intensity distribution modeling. The black coating and transparent protective cover on the substrate surface effectively reduce interference from ambient light and reflected light, while the installation of a micro-temperature sensor ensures the stability of the photodetectors during long-term operation. These technical approaches together form an efficient and reliable light intensity data acquisition device suitable for high-precision measurement in complex lighting environments. It can be well applied to the field of visible light indoor position sensing and has broad prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 Schematic diagram of the structure of the detection board assembly.

[0028] Figure 3 Schematic diagram of the structure of the transparent protective cover.

[0029] Figure 4 This is a schematic diagram of the assembly of the mobile platform and the slide rail.

[0030] Figure 5 Schematic diagram of the structure of the light source positioning component.

[0031] Figure 6 This is the system block diagram of the data processing module.

[0032] The accompanying drawings are numbered as follows:

[0033] 1. Substrate; 2. Photodetector; 3. Transparent protective cover; 4. Micro temperature sensor; 5. Slide rail; 6. Slider; 7. Stepper motor; 8. Displacement sensor; 9. Limit switch; 10. Point light source; 11. Light shield; 12. Signal acquisition unit; 13. Computing unit; 14. Wireless communication module; 15. Display; 16. Heat sink; 17. Threaded sleeve; 18. Positioning mark. DETAILED DESCRIPTION

[0034] The present invention provides a visible light indoor position sensing data acquisition device based on an array sensor. By optimizing the arrangement of the detector array and constructing a precise optical channel model, the device improves the spatial resolution and angular correlation of light intensity data acquisition. The following describes specific embodiments of the present invention in detail with reference to the accompanying drawings.

[0035] like Figure 1As shown in Figure 1, the device includes a detection plate assembly, a light source positioning assembly, and a data processing module. The detection plate assembly consists of a base plate 1, a photodetector 2, a transparent protective cover 3, a micro temperature sensor 4, a heat sink 16, and a threaded sleeve 17. The light source positioning assembly includes a point light source 10, a light shield 11, and a fixed bracket on the top of the experimental platform. The data processing module consists of a signal acquisition unit 12, a calculation unit 13, a wireless communication module 14, and a display screen 15.

[0036] The substrate 1 is a square metal plate with a side length of 5 cm and a thickness of 2 mm. The material is aluminum alloy to ensure mechanical strength and lightweight design. The top side of the substrate 1 is coated with a black coating with a reflectivity of less than 5% and a thickness of 0.1 mm to reduce interference from external ambient light. Eight positioning marks 18 are engraved on the surface of the substrate 1. These marks are evenly distributed in three rows and three columns. Each mark has a diameter of 1 mm and a depth of 0.5 mm. They are used to assist in the installation and calibration of the photodetector 2. A circular groove with a diameter of 1 cm and a depth of 1 mm is opened at the center line of the substrate 1 for installing the micro temperature sensor 4. The measurement range of the micro temperature sensor 4 is -20°C to 100°C, with a measurement accuracy of 0.1°C. Its output end is connected to the data processing module via a signal line for real-time monitoring of temperature changes on the surface of the substrate 1.

[0037] There are five photodetectors 2, which are fixed on the top side of the substrate 1. Four photodetectors 2 are located at the four corner positions of the substrate 1, and the fifth photodetector 2 is located at the geometric center position of the substrate 1. The photosensitive surface of each photodetector 2 is set upward, and the photosensitive surface is parallel to the plane of the substrate 1. The photodetectors 2 at the four corner positions form a 45-degree angle with the center position of the substrate 1, and the angle between the photodetectors 2 at two adjacent corner positions is 90 degrees. This irregular distribution design enhances the angular correlation and spatial difference of data acquisition. The bottom side of the photodetector 2 is fixed to the top side of the substrate 1 by bolts. The bolts pass through the mounting holes reserved in the substrate 1 and are tightened to ensure that the photodetector 2 is stable and not loose.

[0038] The transparent protective cover 3 is a square, 2 mm thick polycarbonate cover that covers the top side of the substrate 1 and completely encloses the five photodetectors 2. The inner surface of the transparent protective cover 3 is coated with an anti-reflective coating 0.05 mm thick to reduce light reflection losses from the protective cover's surface. The edges of the transparent protective cover 3 are fixed to the edges of the substrate 1 via snap-fit mechanisms, ensuring a tight fit and preventing dust and moisture from entering.

[0039] A heat sink 16 is fixedly mounted on the bottom side of base plate 1. Made of aluminum alloy, it has a surface area twice the size of the base plate's bottom side. Heat sink 16 is secured to the center of base plate 1's bottom side with bolts threaded through pre-defined mounting holes and tightened. Base plate 1 also features four through-holes with a diameter of 4 mm, evenly distributed at the four corners. Each through-hole houses a threaded sleeve 17 made of stainless steel, with an outer diameter of 4 mm and an inner diameter of 3 mm. These sleeves are used to strengthen the connection between base plate 1 and the mobile platform.

[0040] like Figure 4 As shown, the bottom side of the substrate 1 is fixedly connected to a slider 6 via bolts, which is mounted on a slide rail 5. The slide rail 5 is horizontally arranged and 4.5 meters long, with its ends connected to the two side walls of the experimental platform via fixed brackets. A stepper motor 7 is mounted on the side of the slide rail 6. The output shaft of the stepper motor 7 is connected to a gear inside the slide rail 6, which meshes with a rack distributed on the slide rail 5. The stepper motor 7 controls the rotation of the gear, thereby achieving horizontal movement of the gear on the rack, further driving the slide rail 6 along the slide rail 5. Also mounted on the slide rail 5 are a displacement sensor 8 and a limit switch 9. The displacement sensor 8 has a measurement range of 0 to 4.5 meters and an accuracy of 0.1 mm. Its output is connected to a data processing module via a signal line for real-time monitoring of the position of the substrate 1 on the slide rail 5. The limit switch 9 has a trigger distance of 5 mm and its output is electrically connected to the control circuit of the stepper motor 7 to prevent the slide rail 6 from exceeding the predetermined travel range on the slide rail 5.

[0041] like Figure 5 As shown, the light source positioning assembly includes a point light source 10, which is fixed at the center of the top of the experimental platform, with its center at a height of 3 meters from the ground. The light-emitting surface of the point light source 10 is set downward, with a light-emitting wavelength of 550 nanometers, a light-emitting power of 5 watts, a power supply voltage of 12 volts, a power supply current of 500 milliamperes, and a service life of 50,000 hours. The luminous intensity of the point light source 10 is controlled by an adjustment circuit, and the adjustment circuit is electrically connected to the data processing module. A light shield 11 is installed on the periphery of the point light source 10. The material of the light shield 11 is black plastic, and the inner wall is coated with a layer of light-absorbing material. The opening diameter of the light shield 11 is 10 cm, the depth is 5 cm, and the opening is set downward to reduce the impact of stray light from the point light source 10 on the experimental environment.

[0042] like Figure 6As shown, the data processing module includes a signal acquisition unit 12, a calculation unit 13, a wireless communication module 14 and a display screen 15. The signal acquisition unit 12 is electrically connected to five photodetectors 2 through wires, and is used to receive the light intensity signal output by the photodetector 2. The signal acquisition unit 12 contains five independent signal amplification circuits, each of which is electrically connected to a photodetector 2, with a gain range of 1 to 100 times, and the gain value is adjusted by an external knob. The output end of the signal acquisition unit 12 is connected to the input end of the calculation unit 13 through a data line, and the transmission rate of the data line is 10 megabits per second. The calculation unit 13 includes an embedded processor and a memory. The model of the embedded processor is ARMCortex-M4, and the capacity of the memory is 16 gigabytes. The embedded processor runs a light intensity distribution modeling algorithm, which analyzes the light intensity signal collected by the photodetector 2 based on the optical channel model. The specific formula of the optical channel model is Wherein, I(x, y, z) represents the light intensity value at the spatial coordinate (x, y, z); P0 represents the initial luminous power of the point light source; r represents the distance from the point light source 10 to the photodetector 2; α represents the attenuation coefficient of light in air; θ represents the angle between the light and the normal of the photosensitive surface of the photodetector 2; n represents the angle dependence index, which ranges from 1 to 4.

[0043] The wireless communication module 14 is an ESP32 model, operating at a 2.4 GHz frequency band and a transmission rate of 10 megabits per second. It communicates with external devices via an antenna and is used to transmit the light intensity distribution map and the location information of the point light source 10 to a remote terminal. The display screen 15 is 7 inches in size and has a resolution of 1024×768 pixels. It is connected to the housing of the data processing module via a hinge and displays the light intensity distribution map, the location information of the point light source 10, and the real-time signal strength of the photodetector 2.

[0044] In practical application, the device operates as follows: First, an external controller activates the stepper motor 7, driving the slider 6 along the slide rail 5 to move the substrate 1 to the desired position. A displacement sensor 8 monitors the position of the substrate 1 in real time and transmits the data to the data processing module. When the substrate 1 reaches the target position, the point light source 10 begins to emit light, with its intensity controlled by a regulation circuit. The photodetector 2 receives the light emitted by the point light source 10 and converts the light intensity signal into an electrical signal. The signal acquisition unit 12 receives the electrical signal output by the photodetector 2, processes it through a signal amplification circuit, and transmits it to the calculation unit 13. The calculation unit 13 analyzes the light intensity signal based on the optical channel model, generates a light intensity distribution map, and stores it in memory. Simultaneously, the wireless communication module 14 transmits the light intensity distribution map and the position of the point light source 10 to a remote terminal, and the display screen 15 displays the light intensity distribution map and related data in real time. A micro temperature sensor 4 monitors temperature changes on the surface of the substrate 1 in real time and transmits the data to the data processing module, ensuring the stability of the photodetector 2 during long-term operation.

[0045] In order to better enable relevant personnel in this technical field to fully understand and implement the present invention, the specific implementation principle of the present invention is supplemented below with reference to a specific application scenario.

[0046] In the light intensity data collection experiment under complex lighting environment, it is first necessary to fix the detection plate assembly 1 to the slider 6 through the threaded sleeve 17. The slider 6 is installed on the slide rail 5 and is driven by the stepper motor 7 to move along the slide rail 5. The two ends of the slide rail 5 are connected to the two side walls of the experimental platform through fixed brackets to ensure that the movement range of the slider 6 is 0 to 4.5 meters. The displacement sensor 8 monitors the position of the slider 6 in real time and transmits the data to the data processing module. Its measurement accuracy is 0.1 mm, thereby ensuring that the position of the substrate 1 on the slide rail 5 can be precisely controlled. The limit switch 9 is set at both ends of the slide rail 5. When the slider 6 approaches the limit position of the slide rail 5, the limit switch 9 triggers and stops the operation of the stepper motor 7 to prevent the slider 6 from exceeding the predetermined stroke.

[0047] The point light source 10 is fixed at the center of the top of the experimental platform, with its center at a height of 3 meters from the ground, and the luminous surface is set downward. A light shield 11 is installed on the periphery of the point light source 10, and the inner wall of the light shield 11 is coated with a light-absorbing material to reduce the impact of stray light on the experimental environment. The luminous intensity of the point light source 10 is controlled by a regulating circuit, which is electrically connected to the data processing module and can dynamically adjust the luminous power according to the experimental requirements. The wavelength of the light emitted by the point light source 10 is 550 nanometers and the power is 5 watts, which can simulate the experimental scene under specific lighting conditions.

[0048] Five photodetectors 2 are fixed to the top side of the substrate 1, of which four photodetectors 2 are located at the four corner positions of the substrate 1, and the fifth photodetector 2 is located at the geometric center position of the substrate 1. This irregular distribution design makes the angle between the photodetectors 2 at two adjacent corner positions 90 degrees, while the photodetector 2 at each corner position forms a 45-degree angle with the center position. This arrangement can significantly enhance the angular correlation and spatial differentiation of data acquisition within a limited area. The photosensitive surfaces of the photodetectors 2 are all facing upward and parallel to the plane of the substrate 1 to ensure the consistency of the incident angle of light. The black coating coated on the surface of the substrate 1 has a reflectivity of less than 5% and a thickness of 0.1 mm, which effectively reduces the interference of external ambient light.

[0049] When the point light source 10 emits light, the light propagates through the air and reaches the photosensitive surface of the photodetector 2. The photodetector 2 converts the received light signal into an electrical signal and transmits it to the signal acquisition unit 12 through a wire. The signal acquisition unit 12 includes five independent signal amplification circuits, each of which is electrically connected to a photodetector 2. The gain range is 1 to 100 times, and the gain value can be adjusted by an external knob. The amplified electrical signal is transmitted to the calculation unit 13 through the data line at a rate of 10 megabits per second. The embedded processor in the calculation unit 13 runs the light intensity distribution modeling algorithm and analyzes the light intensity signal collected by the photodetector 2 based on the optical channel model. The specific formula of the optical channel model is Where I(x, y, z) represents the light intensity at the spatial coordinate (x, y, z); P0 represents the initial luminous power of the point light source; r represents the distance from the point light source 10 to the photodetector 2; α represents the attenuation coefficient of light in air; θ represents the angle between the light and the normal to the photosensitive surface of the photodetector 2; and n represents the angle dependence index, which ranges from 1 to 4. Using this model, the calculation unit 13 can generate a high-precision light intensity distribution map and store it in memory.

[0050] A micro-temperature sensor 4 is mounted within a circular groove in the center of substrate 1. It monitors surface temperature changes in real time and transmits this data to the data processing module. The micro-temperature sensor 4 has a measurement range of -20°C to 100°C with an accuracy of 0.1°C, ensuring the stability of the photodetector 2 during extended operation. A heat sink 16 is secured to the underside of substrate 1. Made of aluminum alloy, this heat sink has a surface area twice that of the substrate's bottom side and effectively reduces the temperature rise of the photodetector 2 during operation.

[0051] A transparent protective cover 3 covers the top side of substrate 1, completely encasing the five photodetectors 2. Made of 2 mm thick polycarbonate, the transparent cover 3 features a 0.05 mm thick anti-reflective coating on its inner surface to reduce light reflection losses. The transparent cover 3 is securely attached to the edge of substrate 1 via a snap-fit mechanism, ensuring a tight fit and preventing dust and moisture from entering.

[0052] The wireless communication module 14 communicates with an external device via an antenna, transmitting the light intensity distribution map and the location information of the point light source 10 to a remote terminal. The wireless communication module 14 operates at a frequency of 2.4 GHz and a transmission rate of 10 megabits per second. The display screen 15 is hinged to the housing of the data processing module and displays the light intensity distribution map, the location information of the point light source 10, and the real-time signal strength of the photodetector 2. The display screen 15 is 7 inches in size and has a resolution of 1024 × 768 pixels, making it easy for experimenters to view data in real time.

[0053] In actual operation, when the substrate 1 reaches the target position on the slide rail 5, the point light source 10 starts to emit light, and its luminous intensity is controlled by the regulating circuit. The photodetector 2 receives the light emitted by the point light source 10 and converts the light intensity signal into an electrical signal. The signal acquisition unit 12 receives the electrical signal output by the photodetector 2, and transmits it to the calculation unit 13 after being processed by the signal amplification circuit. The calculation unit 13 analyzes the light intensity signal according to the optical channel model, generates a light intensity distribution map and stores it in the memory. At the same time, the wireless communication module 14 transmits the light intensity distribution map and the position information of the point light source 10 to the remote terminal, and the display screen 15 displays the light intensity distribution map and related data in real time. The micro temperature sensor 4 monitors the temperature changes on the surface of the substrate 1 in real time, and transmits the data to the data processing module to ensure the stability of the photodetector 2 during long-term operation.

[0054] Through the above steps, the present device can achieve high-precision light intensity data acquisition in complex lighting environments. The irregular distribution design of the photodetector 2 enhances the angular correlation and spatial variability of data acquisition, while the introduction of the optical channel model significantly improves the accuracy of light intensity distribution modeling. The black coating on the surface of the substrate 1 and the transparent protective cover 3 effectively reduce interference from external ambient light and reflected light, and the installation of the micro-temperature sensor 4 ensures the stability of the photodetector 2 during long-term operation. These technical means together constitute an efficient and reliable light intensity data acquisition device suitable for high-precision measurement requirements in complex lighting environments. It can be well applied to the field of visible light indoor position sensing and has broad prospects.

[0055] Any content not described in detail in the specification belongs to the prior art known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited, and conventional equipment can be used. In this technical solution, electrical control components not mentioned are not shown in the figures because they belong to the prior art and will not be described here.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A visible light indoor position sensing data acquisition device based on an array sensor, characterized by: It includes a detection board assembly, a light source positioning assembly and a data processing module; The detection plate assembly comprises a square substrate (1), the side length of the substrate (1) is 5 cm, five photoelectric detectors (2) are fixedly mounted on the top side of the substrate (1), and the five photoelectric detectors (2) are distributed on the surface of the substrate (1) in a specific geometric arrangement; the bottom side of the substrate (1) is fixedly connected to a mobile platform via bolts, a slide rail (5) is mounted on the bottom of the mobile platform, and the slide rail (5) is arranged in a horizontal direction and connected to a driving mechanism; The light source positioning assembly includes a point light source (10), which is fixed at the center of the top of the experimental platform, with the center of the point light source (10) at a height of 3 meters from the ground of the experimental platform, and the light-emitting surface of the point light source (10) is arranged downward, and the light intensity of the point light source (10) is controlled by an adjustment circuit, and the adjustment circuit is electrically connected to the data processing module; The data processing module comprises a signal acquisition unit (12) and a calculation unit (13). The signal acquisition unit (12) is electrically connected to the five photodetectors (2) via wires and is used to receive light intensity signals output by the photodetectors (2). The calculation unit (13) is communicatively connected to the signal acquisition unit (12) and is used to analyze the light intensity signals and generate a light intensity distribution diagram.

2. The visible light indoor position sensing data acquisition device based on array sensors according to claim 1, characterized in that: The five photodetectors (2) are arranged on the substrate (1) in such a manner that four photodetectors (2) are respectively located at four corner positions of the substrate (1), and the fifth photodetector (2) is located at the geometric center position of the substrate (1); the photosensitive surface of each photodetector (2) is arranged upward and parallel to the plane of the substrate (1); the photodetectors (2) at the four corner positions respectively form an angle of 45 degrees with the center position of the substrate (1), and the angle between the photodetectors (2) at two adjacent corner positions is 90 degrees.

3. The visible light indoor position sensing data acquisition device based on array sensors according to claim 1, characterized in that: The surface of the substrate (1) is coated with a black coating with a reflectivity of less than 5% and a thickness of 0.1 mm; a heat sink (16) is fixedly installed on the bottom side of the substrate (1), the heat sink (16) is made of aluminum alloy, and the surface area of the heat sink (16) is twice the area of the bottom side of the substrate (1).

4. The visible light indoor position sensing data acquisition device based on array sensors according to claim 1, characterized in that: The slide rail (5) is 4.5 meters long, and both ends of the slide rail (5) are connected to the two side walls of the experimental platform through fixed brackets; a slider (6) is installed on the slide rail (5), and the slider (6) is fixedly connected to the bottom side of the base plate (1) through bolts; a stepper motor (7) is installed on the side of the slider (6), and the output shaft of the stepper motor (7) is engaged with the internal gear of the slider (6), and the stepper motor (7) drives the slider (6) to move along the slide rail (5) through an external controller.

5. The visible light indoor position sensing data acquisition device based on array sensors according to claim 1, characterized in that: The signal acquisition unit (12) includes five independent signal amplification circuits, each of which is electrically connected to a photodetector (2), and the gain range of the signal amplification circuit is 1 to 100 times; the output end of the signal acquisition unit (12) is connected to the input end of the calculation unit (13) via a data line, and the data line transmission rate is 10 megabits per second.

6. The visible light indoor position sensing data acquisition device based on array sensors according to claim 1, characterized in that: The computing unit (13) includes an embedded processor and a memory. The embedded processor model is ARM Cortex-M4 and the memory capacity is 16 gigabytes. The embedded processor runs a light intensity distribution modeling algorithm. The algorithm analyzes the light intensity signal collected by the photodetector (2) based on the optical channel model.

7. The visible light indoor position sensing data acquisition device based on array sensors according to claim 1, characterized in that: A transparent protective cover (3) is fixedly mounted on the top side of the substrate (1). The transparent protective cover (3) is made of polycarbonate and has a thickness of 2 mm. The surface of the transparent protective cover (3) is coated with an anti-reflection coating, and the thickness of the anti-reflection coating is 0.05 mm.

8. The visible light indoor position sensing data acquisition device based on array sensors according to claim 1, characterized in that: A displacement sensor (8) is installed on the slide rail (5). The displacement sensor (8) has a measurement range of 0 to 4.5 meters and a measurement accuracy of 0.1 mm. The output end of the displacement sensor (8) is connected to the input end of the data processing module through a signal line.

9. The visible light indoor position sensing data acquisition device based on array sensors according to claim 1, characterized in that: The data processing module further comprises a display screen (15) having a size of 7 inches and a resolution of 1024×768 pixels; the display screen (15) is connected to the data processing module housing via a hinge. The visible light indoor position sensing data acquisition device based on an array sensor according to claim 1 is characterized in that: A circular groove is provided at the center of the substrate (1), with a diameter of 1 cm and a depth of 2 mm. A micro temperature sensor (4) is installed in the circular groove, and the micro temperature sensor (4) has a measurement range of -20°C to 100°C and a measurement accuracy of 0.1°C. The output end of the micro temperature sensor (4) is connected to the input end of the data processing module via a signal line.

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