Multispectral luminosity three-dimensional light source system

Abstract

The multispectral luminosity three-dimensional light source system comprises a light source body and a light source control circuit electrically connected with the light source body, and the light source body is formed by splicing a plurality of detachably connected fan-shaped assemblies. The fan-shaped assembly comprises a shell, a plurality of circuit boards arranged on the inner side face of the shell and multicolor light-emitting bodies arranged on the circuit boards, a dustproof transparent cover is further arranged on the inner side face of the light source body, and a plurality of pressing strips arranged in an annular array mode are arranged on the transparent cover. The light source control circuit comprises a driving circuit, a detection circuit and a light source circuit, the luminous body is arranged on the light source circuit, one end of the detection circuit is connected with the driving circuit, and the other end of the detection circuit is connected with the light source circuit; multi-angle coverage and full-spectrum illumination are achieved through the layout of circuit boards with different included angles and the combination of the four-color LEDs. A feedback system is constructed, LED current is adjusted to a constant current state in real time, light source stability is ensured, and the service life of a device is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of optical detection and imaging, and in particular relates to a multi-spectral photometric stereo light source system. Background Art

[0002] Existing photometric stereo light source systems mostly adopt an integrated structure, in which the light source housing and the internal circuit board are fixed and cannot be separated, resulting in the need to disassemble the entire component when local components are damaged, resulting in low maintenance efficiency and high costs. In addition, traditional light sources have a single illumination angle and limited spectral coverage, which makes it difficult to meet the needs of complex detection scenarios for multi-angle and multi-spectrum lighting. For example, a single-angle light source cannot fully capture subtle defects on the surface of an object, and a single spectrum of light may not be able to excite the fluorescence characteristics of a specific material or enhance the defect contrast. In terms of control, existing systems mostly rely on simple open-loop circuits and lack real-time current detection and feedback mechanisms. The stability of the light source is easily affected by current fluctuations, and even LED overload and damage occurs. These problems limit the application effect and scope of photometric stereo technology in industrial inspection, material analysis and other fields. Summary of the invention

[0003] (1) Technical issues to be solved

[0004] The invention discloses a multi-spectral photometric stereo light source system, aiming to solve the above problems.

[0005] (2) Technical solution

[0006] The present invention discloses a multi-spectral photometric stereo light source system, comprising a light source body and a light source control circuit electrically connected to the light source body, wherein the light source body is provided with a window coaxially arranged with the central axis L thereof, and the light source body is formed by splicing a plurality of detachably connected fan-shaped components, wherein the fan-shaped components comprise a shell, a plurality of circuit boards arranged on the inner side of the shell, and a multi-color luminous body arranged on the circuit board, wherein different circuit boards form different angles with the central axis L, and the inner side of the light source body is further provided with a dustproof transparent cover, wherein the transparent cover is provided with a plurality of pressure strips arranged in a ring array, and when the transparent cover covers the luminous body, the pressure strips are simultaneously pressed and fixed on the opposite edges of the adjacent circuit boards in the same fan-shaped component;

[0007] The light source control circuit includes a driving circuit, a detection circuit and a light source circuit. The light-emitting body is arranged on the light source circuit. One end of the detection circuit is connected to the driving circuit, and the other end is connected to the light source circuit. The detection circuit includes an operational amplifier, a MOS tube and a control resistor. The in-phase input end of the operational amplifier is connected to the driving circuit, and the output end is connected to the gate of the MOS tube. The drain (D) of the MOS tube is connected to the light source circuit, and the source is connected to the control resistor and the inverting input end of the operational amplifier. The other end of the control resistor is grounded.

[0008] Furthermore, the shell is provided with a first end and a second end opposite to each other, the first end is provided with a first connecting portion, and the second end is provided with a second connecting portion.

[0009] Furthermore, the shell includes a shell body one and a shell body two, the shell body one and the shell body two are staggered and spliced, the first connecting part and the second connecting part of the shell body one are both protrusions or concave blocks, and the first connecting part and the second connecting part of the shell body two are both concave blocks or protrusions that match the protrusions or concave blocks.

[0010] Furthermore, the first connection portion of the shell is a convex block, and the second connection portion is a concave block, and the adjacent shells are spliced ​​by snapping the convex block and the concave block.

[0011] Furthermore, a detection resistor is connected in series between the source of the MOS tube and the inverting input terminal of the operational amplifier.

[0012] Furthermore, the light source circuit includes four light source units, and a detection circuit with the same structure is provided between each light source unit and the driving circuit.

[0013] Furthermore, the four light source units correspond to four different colored LED lights on the light emitting body, and the four colors are red, blue, white and green respectively.

[0014] Furthermore, the driving circuit is provided with a converter which is simultaneously connected to four light source units of the light source circuit.

[0015] Furthermore, the light-emitting body in the light source body is arranged in a ring shape along the window toward the edge of the shell.

[0016] Furthermore, the same fan assembly is provided with a plurality of circuit boards, and the angles formed by the extension lines of the different circuit boards spreading along the window toward the edge of the shell and the central axis L are 90°, 75°, 60°, 45°, 30°, and 15° respectively.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The light source body is made up of detachable fan-shaped components, which support the separate replacement of damaged circuit boards or light-emitting bodies, significantly reducing maintenance costs and improving system reliability; through the combination of circuit board layouts at different angles and four-color LEDs, multi-angle coverage and full-spectrum lighting are achieved, which can be adapted to various scenarios such as metal defect detection, fluorescence excitation, and appearance evaluation; the detection circuit constructs a feedback system through operational amplifiers and MOS tubes, and adjusts the LED current to a constant current state in real time to ensure the stability of the light source and extend the life of the device; the dust-proof transparent cover and pressure strip design take into account both protection and easy maintenance, and the hemispherical light source body optimizes space utilization and avoids the assembly complexity and angle offset problems of traditional rectangular structures; the above innovations enable the system to have both efficient maintenance, high-precision detection and high stability, significantly improving the practicality and applicability of photometric stereo technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structure of the present invention is schematically shown Figure 1 .

[0020] Figure 2 The structure of the present invention is schematically shown Figure 2 .

[0021] Figure 3 The principle framework of the present invention Figure 1 .

[0022] Figure 4 The explosion of the present invention Figure 1 .

[0023] Figure 5 The explosion of the present invention Figure 2 .

[0024] Figure 6 The cross-sectional view of the present invention Figure 1 .

[0025] Figure 7 The principle framework of the present invention Figure 2 .

[0026] Figure 8 The principle framework of the present invention Figure 3 .

[0027] Fig. 9 The cross-sectional view of the present invention Figure 2 .

[0028] Fig.10 The explosion of the present invention Figure 3 .

[0029] Fig.11 This is a shell diagram of the present invention.

[0030] Fig.12 The cross-sectional view of the present invention Figure 3 .

[0031] Fig.13 It is a bottom view of the present invention.

[0032] Fig.14 The principle framework of the present invention Figure 4 .

[0033] Figure markings: 1-light source body, 11-window, 2-fan-shaped component, 21-shell, 211-first end, 212-second end, 213-first connecting part, 214-second connecting part, 215-shell body one, 216-shell body two, 22-circuit board, 23-luminous body, 3-transparent cover, 31-pressing strip, 4-light source control circuit, 5-driving circuit, 51-converter, 6-detection circuit, 61-operational amplifier, 611-in-phase input terminal, 612-inverting input terminal, 613-output terminal, 62-MOS tube, 63-control resistor, 64-detection resistor, 65-switch chip, 7-light source circuit, 71-light source unit, 8-plug, 9-fixing ring. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1-6As shown, the present invention discloses a multi-spectral photometric stereo light source system, including a light source body 1 and a light source control circuit 4. The light source body 1 is in the shape of a hemisphere. The light source body 1 is provided with a window 11 coaxially arranged with its central axis L. The light source body 1 is composed of a plurality of detachably connected fan-shaped components 2. The fan-shaped components 2 include a shell 21, a plurality of circuit boards 22 arranged on the inner side of the shell 21, and a multi-color luminous body 23 arranged on the circuit board 22. Different circuit boards 22 form different angles with the central axis L. The inner side of the light source body 1 is also provided with a dustproof transparent cover 3. The luminous body 23 on the circuit board 22 can emit light from The outside shines into the inside through the transparent cover 3. The transparent cover 3 is provided with a plurality of beadings 31 arranged in a circular array. The beadings 31 are formed by the upward protrusions of the transparent cover 3, and each of the protrusions forms an annular groove with each other. When the transparent cover 3 covers the light-emitting body 22, the beadings 31 are simultaneously pressed and fixed on the opposite edges of the adjacent circuit boards 22 in the same fan-shaped component 2, so that the light-emitting body 23 on the circuit board 22 is divided into several layers by the beadings 31, and each layer of the light-emitting body 23 corresponds to different annular grooves. It is worth noting that the material of the transparent cover 3 is acrylic material, and it can also be transparent glass material, which can also achieve similar effects.

[0036] Most of the existing three-dimensional light sources on the market adopt an integrated structure, whether it is the outer shell of the light source or the circuit board inside the light source, they are all integrated structures. When the circuit board or a light-emitting body on the circuit board is damaged, on the one hand, it will affect the normal operation of the entire light source. On the other hand, when disassembling and repairing, the entire light source needs to be disassembled and the entire circuit board needs to be taken out for repair. The whole operation process is very cumbersome and has a low fault tolerance rate. However, through the multi-spectral photometric three-dimensional light source of the present application, the light source body 21 is divided into a plurality of fan-shaped components 2, and a plurality of circuit boards 22 are arranged in the fan-shaped component 2, and the pressure strip 31 of the dust-proof transparent cover 3 fixes the plurality of circuit boards 22 to the fan-shaped component 2. This structural design enables the three-dimensional light source to have the convenience of a split structure on the one hand, especially when repairing and disassembling, only one of the damaged circuit boards 22 needs to be disassembled and repaired, and it will not affect the normal operation of other components. On the other hand, the pressure strip 31 of the transparent cover 3 has the stability of an integrated structure.

[0037] like Figure 3 , Figure 7-8As shown, the light source control circuit 4 includes a driving circuit 5, a detection circuit 6 and a light source circuit 7 arranged on the circuit board 22, one end of the detection circuit 6 is connected to the driving circuit 5, and the other end is connected to the light source circuit 7, the detection circuit 6 includes an operational amplifier 61, a MOS tube 62 and a control resistor 63, wherein the positive power supply end of the operational amplifier 61 is connected to a +5V power supply, and the negative power supply end is grounded, the MOS tube 62 is an N-type MOS tube, model LM324, the in-phase input end 611 of the operational amplifier 61 is connected to the driving circuit 5, the output end 613 is connected to the gate G of the MOS tube 62, the drain D of the MOS tube 62 is connected to the light source circuit 7, and the source S is connected to the control resistor 6 3 and the inverting input terminal 612 of the operational amplifier 61, one end of the control resistor 63 is connected to the source S of the MOS tube 62, and the other end is grounded, wherein the working principle of the operational amplifier 61 is: when the voltage of the inverting input terminal 612 is less than or equal to the voltage of the non-inverting input terminal 611, the voltage is about 0.5V, and the output terminal 613 works normally, and when the voltage of the inverting input terminal 612 is greater than the voltage of the non-inverting input terminal 611, the output terminal 613 outputs a negative voltage, and the working principle of the MOS tube 62 is: when the gate G voltage is greater than the source S voltage, the conduction degree of the MOS tube 62 increases, and when the gate G voltage is less than the source S voltage, the conduction degree of the MOS tube 62 decreases.

[0038] Specifically, Figure 7-8 As shown, in an example of the present invention, the light source circuit 7 is provided with an LED lamp and connected to a 48V power supply, and the resistance of the control resistor 63 is 100 milliohms. This structural design allows a voltage drop to be generated at both ends when current passes through the control resistor 63, and this voltage drop is proportional to the current. Since one end is grounded and the other end is connected to the LED lamp group, the operational amplifier 61 can accurately calculate the current value flowing through the LED lamp group by detecting the voltage of the non-grounded end of the resistor relative to the ground, thereby providing key data for subsequent current control. A detection resistor 64 is connected in series between the source S of the MOS tube 62 and the inverting input terminal 612 of the operational amplifier 61, and the resistance is 1K ohms. The detection resistor 64 cooperates with the operational amplifier to determine the gain of the entire current detection and control loop. The appropriate resistance value allows the operational amplifier to accurately adjust the control signal output to the field effect tube according to the detected weak voltage change, thereby stably controlling the current in the LED circuit.

[0039] Furthermore, if Figure 7-8As shown in the figure, when the light source circuit 7 is just connected to the 48V power supply, the current of the entire path is small, the voltage flowing through the control resistor 63 is also small, and the voltage of the inverting input terminal 612 of the operational amplifier 61 connected to the path where the control resistor 2 is located is also small. At this time, the voltage of the inverting input terminal 612 is less than the voltage of the non-inverting input terminal 611, and the output terminal 613 of the operational amplifier 61 outputs a high level to the gate G of the MOS tube 62. At this time, the gate G of the MOS tube 62 is greater than the voltage of the source S and continues to increase the conduction degree of the MOS tube 62, and the current flowing through the MOS tube 62 of the light source circuit 7 is also continuously increased. As the voltage of the inverting input terminal 612 of the operational amplifier 61 increases, the voltage of the inverting input terminal 612 of the operational amplifier 61 also increases. When the voltage of the inverting input terminal 612 is greater than the non-inverting input terminal 611, the output terminal 613 of the operational amplifier 61 outputs a low level. At this time, the MOS tube reduces the degree of conduction, causing the current of the light source circuit 7 to decrease. Through this closed-loop control, the voltage of the non-inverting input terminal 611 of the operational amplifier 61 is eventually made equal to the voltage of the inverting input terminal 612, thereby finally realizing the constant current of the light source circuit 7. In addition, when an abnormal situation occurs in the light source circuit 7, causing the current to increase, the control circuit 2 can also serve as a protection circuit.

[0040] Furthermore, the function of the detection resistor 64 in this process is: on the one hand, it can protect the operational amplifier 61 and the MOS tube 62. The gate of the MOS tube 62 has parasitic capacitance, and charging and discharging current is required during the switching process. The 1K detection resistor 64 limits the output current of the operational amplifier 61 to avoid instantaneous large current impacting the gate oxide of the operational amplifier 61 or the MOS tube 62, thereby preventing device damage.

[0041] Specifically, Fig. 9 As shown, in one example of the present invention, there are six circuit boards 22 in the same fan assembly, and the angles formed by the extension lines of the different circuit boards 22 that spread along the window 11 to the edge of the shell 21 and the central axis L are 90°, 75°, 60°, 45°, 30°, and 15° respectively, and the circuit boards at each angle can be controlled individually. This structural design maximizes the number of multiple angles within a limited space, which is more comprehensive than most other similar products with only a few angles. When the multi-angle light source is used to detect surface defects and quality control of the product, these 6 angles can more clearly detect scratches, dents and other defects on the surface, thereby improving the accuracy and efficiency of detection.

[0042] Specifically, Figure 10-12As shown, in an example of the present invention, the shell 21 is provided with a first end 211 and a second end 212 relative to each other, the first end 211 is provided with a first connecting portion 213, the second end 212 is provided with a second connecting portion 214, the shell 21 includes a shell body 1 215 and a shell body 216, the shell body 1 215 and the shell body 2 216 are staggered and spliced, the first connecting portion 213 and the second connecting portion 214 of the shell body 1 215 are both convex blocks, and the first connecting portion 213 and the second connecting portion 214 of the shell body 2 216 are both concave blocks matching the convex blocks; correspondingly, a concave block can also be provided at the connecting portion of the shell body 1 215, and a convex block can be provided at the connecting portion of the shell body 2 216, which can also achieve the above-mentioned effect. This structural design makes it possible to produce the light source body 1 by only producing two structures of the shell 21, namely the shell 1 41 and the shell 2 42, so as to complete the fixed assembly of the four shells 21, thereby reducing the production cost. During assembly, it is only necessary to fix the two protruding shell bodies 1 215 and the two concave shell bodies 216 to each other up and down, and the two shells 1 41 are symmetrically placed with the window 11 as the symmetry point, and the two shells 2 42 are placed in the same way, and then further fixed with bolts to complete the operation. The operation is very simple and convenient.

[0043] In another embodiment, the first connecting portion 213 of the shell is a protrusion, and the second connecting portion 214 is a recessed block. The adjacent shells 21 are spliced ​​by snapping the protrusions and the recessed blocks. During production, only one structure of the shells 21 needs to be produced to complete the assembly of four shells 21. During assembly, only the protrusions and recessed blocks of the shells 21 need to be spliced ​​up and down in sequence, and then further fixed with bolts. The operation is simple.

[0044] Specifically, Fig.13As shown, in an example of the present invention, the circuit board 22 is provided with the luminous body 23, and the luminous body 23 is fixedly connected to the circuit board 22 by soldering. The main function of the luminous body 23 is to emit light from different angles to the object to be measured, and after reaching the object to be measured, it is refracted and transmitted to the receiver to complete the information transmission of the object to be measured. The colors that can be emitted by the luminous body 23 include red, blue, green and white. Among them, red light is often used to enhance the contrast of specific materials or defects. When detecting scratches or cracks on the metal surface, red light can make these defects more obvious. Blue light is often used to excite fluorescent materials. Many substances will emit fluorescence under the excitation of blue light, which can be used to detect the coating quality and the presence of markers on the surface of the material. The human eye is most sensitive to green light. In situations where manual visual inspection is required, green light can reduce visual fatigue and improve inspection efficiency and accuracy. White light is a mixture of multiple colors of light, providing full-spectrum lighting. When inspecting product appearance, packaging inspection and surface treatment quality assessment, white light can simulate natural lighting conditions to ensure that the inspection results are consistent with the actual use environment.

[0045] Furthermore, if Fig.14 As shown, the light source circuit 7 includes four light source units 71, each of which is composed of a plurality of LED lamps of the same color. The four light source units 71 correspond to four LED lamps of different colors on the illuminant 23, respectively. The four colors are red, blue, white and green. The drive circuit 5 is provided with a converter 51. The converter 1 is a model of TLC5620 and has four pins, namely DAC R, DAC G, DAC B, DAC W, four light source units 71 are connected to the light source circuit 7 at the same time, and correspond to the red, green, blue and white colors of the light source units 71, and the same detection circuit 6 is arranged between each light source unit 71 and the driving circuit 5, and the converter 51 is the brain of the system, responsible for converting the digital control logic into an analog driving signal, while managing multi-channel collaborative work, power supply stability and external interaction. In the light source application scenario, the light source body 1 includes 4 fan-shaped components 2, the circuit board 22 at 6 angles, and the four colors of the light source 23 on the circuit board 22 can be arranged at will, and there are hundreds of millions of combinations. The light source circuit 7 in the circuit board 22 at each angle in each fan-shaped component 2 is connected to a converter 51, so that the light source system can quickly switch different signals (colors, angles) at will, and finally realize high-precision and multi-functional RGB LED control.

[0046] Specifically, Fig.13As shown, in an example of the present invention, in the light source body, the illuminant 23 arranged on the circuit board 22 is arranged in a ring shape along the window 11 toward the edge of the shell 21, and each circular ring presents a different irradiation angle through the circuit board 22. The thickness of each circular ring is equal. The smaller the angle, the larger the area of ​​the circular ring. Correspondingly, there are more illuminants 23 on the circular ring. The 90-degree circular ring is closest to the window 11 and parallel to the window 11. This structural design distributes the illuminants 23 of different angles in sequence on the arc surface of the light source body 1, and uses the surfaces of different angles on the arc surface to place the illuminants 23 of different irradiation angles. The production and assembly costs are low, and the illuminants 23 are attached to the arc surface, which is not easy to fall off or be damaged. If the light source body 1 is replaced with a rectangle, additional design is required to make the illuminant 23 present a structure with different angles, which increases the production and assembly costs, and is prone to damage or angle deviation, affecting the accuracy and reliability of the photometric stereo light source detection.

[0047] Specifically, Figure 4 As shown, in one example of the present invention, a plug 8 and a mounting groove corresponding to the plug 8 are provided on the outer surface of the shell 21, and a wire hole is provided in the mounting groove. On the one hand, the mounting groove 47 enables the plug 8 to be better fixedly connected to the outer side of the shell 21 in the vertical and horizontal directions. If it is simply bonded, it is easy to cause the plug 8 to fall off, further damaging the circuit board 22 electrically connected to the plug 8. On the other hand, because the outer side of the shell 21 is an arc surface, the mounting groove 47 enables the bottoms of the four plugs 8 to be placed on the same horizontal plane, which is more beautiful and practical. In addition, the edge of the light source body 1 is provided with an annular fixing ring 9 and screws, and the edge of the transparent cover is arranged between the fixing ring 9 and the edge of the light source body, and the screws penetrate and fix the fixing ring 9, the transparent cover 3 and the light source body 1 in sequence.

[0048] Specifically, Figure 8 As shown, in one example of the present invention, a switch chip 65 is connected in series between the driving circuit 5 and the operational amplifier 61. The model of the switch chip 65 is TS5A3159, and the switch chip 65 can switch between different circuit branches, allowing the circuit to switch between different working modes or states. For example, in a radio frequency circuit, different filter circuits or amplifier circuits can be switched to adapt to different frequency bands or signal strengths; it can also be used to switch different power supply paths or distribute power to different circuit modules. For example, in some portable devices, it can switch between battery power and external power supply, or distribute power to different functional modules to achieve effective management and distribution of power.

[0049] The working principle of the present invention is described in detail below:

[0050] The multi-spectral photometric stereo light source system of the present invention realizes multi-angle and multi-spectral light output through modular design and intelligent control. The light source body 1 is composed of a plurality of detachable fan-shaped components 2, each of which is embedded with a circuit board 22 of different angles, and the red, blue, green and white four-color LED 23 illuminants are integrated on the board. Each circuit board 22 forms a different angle (such as 90° to 15°) with the central axis L, and the multi-angle illumination requirements are covered by a circular arrangement. The light source control circuit 4 is composed of the drive circuit 5, the detection circuit 6 and the light source circuit 7: the drive circuit 5 is connected to the converter 5 by the detection circuit 6. 1 outputs multi-channel signals to control LED units of different colors respectively; the detection circuit 6 constructs a closed-loop feedback system based on the operational amplifier 61 and the MOS tube 62 to monitor and adjust the LED current in real time to ensure constant current output and avoid overcurrent damage. The dustproof transparent cover 3 fixes the edge of the circuit board 22 through the pressure strip 31, which not only maintains a stable structure but also facilitates separate disassembly and maintenance. When working, the user can flexibly switch the color combination and irradiation angle of the light source, and the multi-spectral light is projected from different angles to the surface of the object to be measured. After reflection or refraction, the receiver collects information, thereby realizing high-precision detection of surface defects, material characteristics, etc. of the object.

[0051] The innovation of the present invention lies in: modular split design: the light source body is spliced ​​by detachable fan-shaped components, which supports the separate replacement of damaged circuit boards or light-emitting bodies, significantly reducing maintenance costs and improving system reliability; multi-angle and multi-spectrum integration: through the combination of circuit board layouts with different angles and four-color LEDs, multi-angle coverage and full-spectrum lighting are achieved, which can be adapted to various scenarios such as metal defect detection, fluorescence excitation, and appearance evaluation; intelligent closed-loop control: the detection circuit constructs a feedback system through operational amplifiers and MOS tubes, and adjusts the LED current to a constant current state in real time to ensure the stability of the light source and extend the life of the device; structural optimization and compatibility: the dust-proof transparent cover and pressure strip design take into account both protection and easy maintenance, and the hemispherical light source body optimizes space utilization and avoids the assembly complexity and angle offset problems of traditional rectangular structures; the above innovations enable the system to have both efficient maintenance, high-precision detection and high stability, significantly improving the practicality and applicability of photometric stereo technology.

[0052] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

[0053] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A multi-spectral photometric stereo light source system, characterized in that: The invention comprises a light source body (1) and a light source control circuit (4) electrically connected to the light source body (1); the light source body (1) is provided with a window (11) coaxially arranged with its central axis L; the light source body (1) is formed by splicing a plurality of detachably connected fan-shaped components (2); the fan-shaped components (2) comprise a shell (21), a plurality of circuit boards (22) arranged on the inner side of the shell (21) and a multi-color light-emitting body (23) arranged on the circuit board (22); different circuit boards (22) form different angles with the central axis L; the inner side of the light source body (1) is also provided with a dustproof transparent cover (3); the transparent cover (3) is provided with a plurality of pressure strips (31) arranged in a ring array; when the transparent cover (3) covers the light-emitting body (23), the pressure strips (31) are simultaneously pressed and fixed on the opposite edges of adjacent circuit boards (22) in the same fan-shaped component (2); The light source control circuit (4) comprises a driving circuit (5), a detection circuit (6) and a light source circuit (7); the light-emitting body (23) is arranged on the light source circuit (7); one end of the detection circuit (6) is connected to the driving circuit (5), and the other end is connected to the light source circuit (7); the detection circuit (6) comprises an operational amplifier (61), a MOS tube (62) and a control resistor (63); the in-phase input end (611) of the operational amplifier (61) is connected to the driving circuit (5); the output end (613) is connected to the gate (G) of the MOS tube (62); the drain (D) of the MOS tube (62) is connected to the light source circuit (7); the source (S) is connected to the control resistor (63) and the inverting input end (612) of the operational amplifier (61); the other end of the control resistor (63) is grounded.

2. The multi-spectral photometric stereo light source system according to claim 1, characterized in that: The housing (21) is provided with a first end (211) and a second end (212) which are opposite to each other; the first end (211) is provided with a first connecting portion (213), and the second end (212) is provided with a second connecting portion (214).

3. The multi-spectral photometric stereo light source system according to claim 2, characterized in that: The shell (21) includes a shell body one (215) and a shell body two (216), wherein the shell body one (215) and the shell body two (216) are spliced ​​in an alternating manner, and the first connecting portion (213) and the second connecting portion (214) of the shell body one (215) are both convex blocks or concave blocks, and the first connecting portion (213) and the second connecting portion (214) of the shell body two (216) are both concave blocks or convex blocks that match the convex blocks or concave blocks.

4. The multi-spectral photometric stereo light source according to claim 3, characterized in that: The first connection portion (45) of the shell is a convex block, and the second connection portion (46) is a concave block. Adjacent shells (4) are spliced ​​by snapping the convex block and the concave block.

5. The multi-spectral photometric stereo light source system according to claim 1, characterized in that: A detection resistor (64) is connected in series between the source (S) of the MOS tube (62) and the inverting input terminal (612) of the operational amplifier (61).

6. The multi-spectral photometric stereo light source system according to claim 5, characterized in that: The light source circuit (7) comprises four light source units (71), and a detection circuit (6) having the same structure is provided between each light source unit (71) and the driving circuit (5).

7. The multi-spectral photometric stereo light source system according to claim 6, characterized in that: The four light source units (71) correspond to four LED lights of different colors on the light emitting body (23), respectively, and the four colors are red, blue, white and green.

8. The multi-spectral photometric stereo light source system according to claim 7, characterized in that: The driving circuit (5) is provided with a converter (51) which is simultaneously connected to four light source units (71) of the light source circuit (7).

9. The multi-spectral photometric stereo light source system according to claim 1, characterized in that: The light emitting body (23) in the light source body (1) is arranged in a ring shape along the window (11) toward the edge of the housing (21).

10. The multi-spectral photometric stereo light source system according to claim 1, characterized in that: A plurality of circuit boards (22) are provided in the same fan assembly (2), and angles formed by extension lines of different circuit boards (22) spreading along the window (11) toward the edge of the housing (21) and the central axis L are 90°, 75°, 60°, 45°, 30°, and 15°, respectively.

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