Four-channel optical fiber color sensor

Abstract

The four-channel optical fiber color sensor comprises an outer shell, a display screen assembly and keys are arranged at the top of the outer shell, an optical path support, a first PCBA board, a second PCBA board and a third PCBA board are arranged in the outer shell, and the first PCBA board, the second PCBA board and the third PCBA board are electrically connected through flexible circuit boards respectively; in conclusion, the intensity of the internal LED light source can be monitored and adjusted in real time, light source drifting caused by temperature change, LED aging or power supply fluctuation is effectively eliminated, and it is ensured that the intensity of emitted white light is always stable; meanwhile, in combination with accurate sensing and algorithm correction of the internal temperature of the system, the design maximally counteracts the influence of the temperature on the performance of other elements on a photoelectric conversion and signal processing link, and solves the problems that a traditional sensor is easily interfered in a complex industrial environment and is poor in measurement stability. And the performance and the reliability of the product in the application of automation, quality control and the like are greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of color sensor technology, specifically relating to a four-channel fiber optic color sensor. Background Technology

[0002] In the fields of automation and industrial quality control, the need for accurate and stable color recognition of objects is increasingly urgent. However, existing color sensors face numerous challenges: First, the luminous intensity of LEDs, the core light source, is highly susceptible to factors such as ambient temperature, aging, and power supply fluctuations, leading to emission intensity drift and directly compromising measurement accuracy. Second, drastic changes in ambient temperature not only affect the light source but also cause drift in the response characteristics of photodiodes and the parameters of electronic components, and may even lead to minor deformations in the optical structure, making it impossible for the sensor to provide consistent and reliable measurement results at different temperatures. Furthermore, many simple color sensors lack adaptive and compensation mechanisms, failing to monitor their own operating status in real time and dynamically adjust, making it difficult to maintain high accuracy and stability in complex and changing application environments. Therefore, developing a sensor that can effectively overcome the effects of unstable light sources and temperature drift, ensuring long-term stable and accurate color detection, has become a pressing technical challenge. Utility Model Content

[0003] The present invention aims to provide a four-channel fiber optic color sensor to solve the technical problems of existing color sensors having luminous intensity affected by the environment and unstable detection.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] The four-channel fiber optic color sensor includes a housing. The top of the housing has a display screen assembly and buttons. Inside the housing are an optical path support, a first PCBA board, a second PCBA board, and a third PCBA board. The first, second, and third PCBA boards are electrically connected to each other via flexible circuit boards. The optical path support is located between the second and third PCBA boards, and the first PCBA board is located above the optical path support. The display screen assembly and buttons are connected to the first PCBA board. The second PCBA board is connected to a wire harness plug, a red LED, a blue LED, and a green LED. The wire harness plug is mounted at the end of the housing, and the red, blue, and green LEDs are mounted on the optical path support.

[0006] The optical path support is sequentially provided with a high-transmittance filter, a focusing lens, a second semi-reflective lens and a first semi-reflective lens, and the second semi-reflective lens and the first semi-reflective lens are both inclined.

[0007] The light path of the red LED is directed toward the first reflective surface of the first semi-reflective mirror, the light path of the blue LED is located between the second semi-reflective mirror and the first semi-reflective mirror and is directed toward the second reflective surface of the first semi-reflective mirror, and the light path of the green LED is directed toward the second semi-reflective mirror.

[0008] A receiving optical fiber and a transmitting optical fiber are introduced into one side of the outer casing. The end of the transmitting optical fiber corresponds to the high-transmittance filter lens. A first photodiode is also provided on the optical path support. The first photodiode corresponds to the end of the receiving optical fiber. The first photodiode is connected to the third PCBA board and is used to receive and convert the reflected light signal of the test object.

[0009] A power cord is fixed to the outer casing by a wire clip, and the power cord is connected to the first PCBA board, the second PCBA board, and the third PCBA board.

[0010] Furthermore, the outer casing is formed by fastening together an upper cover and a bottom cover, with the display assembly and buttons located on the upper cover.

[0011] Furthermore, a flip cover is installed on the upper cover via a hinge.

[0012] Furthermore, the upper cover is provided with a display window corresponding to the display assembly, and a window piece is pasted on the display window.

[0013] Furthermore, a light-shielding plate is also provided below the optical path support.

[0014] Furthermore, a U-shaped shielding copper foil is also provided inside the bottom shell, and the optical path support, the second PCBA board and the third PCBA board are all located inside the shielding copper foil.

[0015] Furthermore, an optical fiber support is also provided inside the bottom shell. The optical fiber support is equipped with a locking rod and an optical fiber clamping block. The receiving optical fiber and the transmitting optical fiber pass through the optical fiber support respectively. The locking rod acts on the optical fiber clamping block, and the optical fiber clamping block locks and fixes the receiving optical fiber and the transmitting optical fiber.

[0016] Furthermore, the bottom of the base shell is provided with a mounting bracket and an S-shaped sliding buckle.

[0017] Furthermore, a second photodiode is also provided on the optical path support. The second photodiode is located above the high-transmittance filter lens and the focusing lens. The second photodiode is connected to the third PCBA board and is used to receive part of the internal light source light signal for light intensity monitoring and temperature compensation.

[0018] Compared with existing technologies, the beneficial effects of this invention are as follows: By introducing an advanced internal dynamic compensation mechanism for light intensity and temperature, this invention significantly improves the system's beneficial effects; the sensor can monitor and adjust the intensity of the internal LED light source in real time, effectively eliminating light source drift caused by temperature changes, LED aging, or power fluctuations, ensuring that the emitted white light intensity remains stable; simultaneously, combined with precise sensing of the system's internal temperature and algorithm correction, this design maximizes the offsetting of the impact of temperature on the performance of other components in the photoelectric conversion and signal processing chain. Therefore, regardless of fluctuations in ambient temperature, the sensor can always provide highly accurate, consistent, and reliable color detection results, solving the pain points of traditional sensors being susceptible to interference and having poor measurement stability in complex industrial environments, and greatly improving the performance and reliability of the product in applications such as automation and quality control. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is an isometric view of the four-channel fiber optic color sensor of this utility model;

[0021] Figure 2 This is an isometric view of the four-channel fiber optic color sensor of this utility model from another perspective;

[0022] Figure 3 A schematic diagram of the structure of the four-channel fiber optic color sensor after removing the flip cover;

[0023] Figure 4 This is a diagram of the internal structure of a four-channel fiber optic color sensor after removing the outer casing.

[0024] Figure 5 for Figure 4 Exploded view;

[0025] Figure 6 Here is a schematic diagram showing the positions of the components on the optical path support:

[0026] Figure 7 This is an exploded view of the four-channel fiber optic color sensor of this utility model. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] The present invention will be further described in detail below with reference to the embodiments.

[0029] like Figure 1-7 As shown, the core of the four-channel fiber optic color sensor of this invention lies in achieving stable color analysis through a precision optical structure and a dual photoelectric detection system. The following detailed description, in conjunction with the preferred embodiment, illustrates this point:

[0030] The four-channel fiber optic color sensor includes a housing 1, which is formed by a top cover 2 and a bottom cover 3 fastened together. The top cover 2 is equipped with a display assembly 4 and buttons 5. A flip cover 6 is installed on the top cover 2 by a hinge. The top cover 2 has a display window 7 corresponding to the display assembly 4, and a window piece 8 is attached to the display window 7. The bottom cover 3 houses the core functional modules, mainly including an optical path support 9, a first PCBA board 10, a second PCBA board 11, and a third PCBA board 12. The three PCBA boards (10, 11, and 12) are electrically interconnected between layers through a flexible circuit board 13. The first PCBA board 10 is adjacent to the top cover 2 and directly drives the display assembly 4 and buttons 5. The second PCBA board 11 carries the light source and external interface. The third PCBA board 12 is responsible for signal processing and analysis. The optical path support 9 is fixed in the central area of ​​the bottom cover 3, located between the second PCBA board 11 and the third PCBA board 12.

[0031] The second PCBA board 11 is connected to a wire harness plug 14, a red LED light 15, a blue LED light 16 and a green LED light 17, wherein the wire harness plug 14 is assembled at the end of the housing 1, and the red LED light 15, the blue LED light 16 and the green LED light 17 are assembled on the optical path bracket 9.

[0032] The optical path support 9 serves as an optical hub, and the following components are installed in the optical path sequence: high-transmittance filter 18, focusing lens 19, second semi-reflective lens 20 and first semi-reflective lens 21. The second semi-reflective lens 20 and the first semi-reflective lens 21 are both tilted to form a light combining core.

[0033] The outgoing light path of the red LED 15 is directed toward the first reflecting surface of the first semi-reflective mirror 21, the outgoing light path of the blue LED 16 is located between the second semi-reflective mirror 20 and the first semi-reflective mirror 21 and is directed toward the second reflecting surface of the first semi-reflective mirror 21, and the outgoing light path of the green LED 17 is directed toward the second semi-reflective mirror 20. The three colors of light are combined into white light by the semi-reflective mirrors (20, 21), and after passing through the focusing lens 19 and the high-transmittance filter lens 18, they are coupled to the transmitting fiber 22 for output.

[0034] A receiving optical fiber 23 and a transmitting optical fiber 22 are introduced into one side of the outer casing 1. The end of the transmitting optical fiber 22 corresponds to the high-transmittance filter lens 18. A first photodiode 24 and a second photodiode 25 are also provided on the optical path support 9. Both the first photodiode 24 and the second photodiode 25 are connected to the third PCBA board 12. The first photodiode 24 corresponds to the end of the receiving optical fiber 23 and is used to receive and convert the reflected light signal of the object under test. The second photodiode 25 is located above the high-transmittance filter lens 18 and the focusing lens 19 and is used to receive part of the internal light source light signal for light intensity monitoring and temperature compensation.

[0035] A power cord is fixed to the outer casing 1 by a wire clip 26, and the power cord is connected to the first PCBA board 10, the second PCBA board 11 and the third PCBA board 12.

[0036] Further optimization is possible, for example, by setting a light-shielding plate 28 below the optical path support 9. The light-shielding plate 28 can prevent non-target light from entering the optical path or affecting the photodetector, thus ensuring measurement accuracy.

[0037] The bottom shell 3 is also provided with a U-shaped shielding copper foil 29. The optical path support 9, the second PCBA board 11 and the third PCBA board 12 are all located inside the shielding copper foil 29. The shielding copper foil 29 prevents external electromagnetic interference (EMI) from affecting the normal operation of the internal circuit, or prevents the electromagnetic radiation generated by the internal circuit from interfering with external equipment.

[0038] The bottom shell 3 is also provided with an optical fiber support 30, which can be fixed to the optical path support 9. The optical fiber support 30 is provided with a locking rod 31 and an optical fiber clamping block 32. The receiving optical fiber 23 and the transmitting optical fiber 22 pass through the optical fiber support 30 respectively. The locking rod 31 acts on the optical fiber clamping block 32, and the optical fiber clamping block 32 locks and fixes the receiving optical fiber 23 and the transmitting optical fiber 22.

[0039] The bottom of the base shell 3 is provided with a mounting bracket 33 and an S-sliding buckle 34. The mounting bracket 33 is used to fix the sensor on the equipment, bracket or any position where color detection is required, to ensure that the sensor remains stable during operation. The S-sliding buckle 34 is used in conjunction with the mounting bracket 33.

[0040] The color sensor body in this embodiment is formed by fastening an upper cover 2 and a bottom shell 3. The bottom shell 3 has the following layers: a top first PCBA board 10 drives a display screen assembly 4 and buttons 5; a middle optical path support 9 integrates a high-transmittance filter 18, a focusing lens 19, and tilted first and second semi-reflective lenses 21 and 20; a second PCBA board 11 mounts tri-color LEDs (15, 16, 17), whose light is precisely combined by the semi-reflective lenses (20, 21) (red light is directed towards the front surface of the first semi-reflective lens 21, green light directly towards the second semi-reflective lens 20, and blue light towards the rear surface of the first semi-reflective lens 21), synthesizing white light, which is then coupled to the high-transmittance filter 18 through the focusing lens 19 and output to the transmitting fiber 22; a third PCBA board 12 connects a first photodiode 24 (corresponding to the receiving fiber 23 end) for reflected light analysis and a second photodiode 25 (located next to the filter 18 and focusing lens 19) for internal light monitoring; and three PCBA boards (10, 11, 20 ... 12) The optical path and key circuits are interconnected by flexible circuit boards 13, and U-shaped shielding copper foil 29 is used to wrap the optical path and key circuits. The optical fiber bracket 30 drives the optical fiber clamping block 32 through the locking rod 31 to fix the transmitting optical fiber 22 / receiving optical fiber 23.

[0041] During operation, the light emitted by the red LED 15, blue LED 16, and green LED 17 is combined into white light by the first semi-reflective lens 21 and the second semi-reflective lens 20, and then transmitted to the surface of the object under test by the transmitting optical fiber 22. The reflected light from the object, carrying color information, returns via the receiving optical fiber 23 and is converted into an electrical signal by the first photodiode 24, which is then transmitted to the third PCBA board 12 for spectral analysis. Simultaneously, the second photodiode 25 captures a portion of the combined white light in real time, monitoring the light source intensity and temperature. Based on this, the third PCBA board 12 dynamically adjusts the LED driving current (via the second PCBA board 11) and corrects the reflected light signal algorithm to offset the influence of environmental fluctuations. Finally, the corrected color data is compared with the calibration value, and the similarity result is output through the display component 4 or uploaded via the wiring harness connector 14.

[0042] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A four-channel fiber optic color sensor, characterized in that: The device includes an outer casing. The top of the outer casing is equipped with a display screen assembly and buttons. Inside the outer casing, there are an optical path support, a first PCBA board, a second PCBA board, and a third PCBA board. The first PCBA board, the second PCBA board, and the third PCBA board are electrically connected to each other via flexible circuit boards. The optical path support is located between the second PCBA board and the third PCBA board, and the first PCBA board is located above the optical path support. The display screen assembly and buttons are connected to the first PCBA board. The second PCBA board is connected to a wire harness plug, a red LED, a blue LED, and a green LED. The wire harness plug is assembled at the end of the outer casing, and the red LED, blue LED, and green LED are assembled on the optical path support. The optical path support is sequentially provided with a high-transmittance filter, a focusing lens, a second semi-reflective lens and a first semi-reflective lens, and the second semi-reflective lens and the first semi-reflective lens are both inclined. The light path of the red LED is directed toward the first reflective surface of the first semi-reflective mirror, the light path of the blue LED is located between the second semi-reflective mirror and the first semi-reflective mirror and is directed toward the second reflective surface of the first semi-reflective mirror, and the light path of the green LED is directed toward the second semi-reflective mirror. A receiving optical fiber and a transmitting optical fiber are introduced into one side of the outer casing. The end of the transmitting optical fiber corresponds to the high-transmittance filter lens. A first photodiode is also provided on the optical path support. The first photodiode corresponds to the end of the receiving optical fiber. The first photodiode is connected to the third PCBA board and is used to receive and convert the reflected light signal of the test object. A power cord is fixed to the outer casing by a wire clip, and the power cord is connected to the first PCBA board, the second PCBA board, and the third PCBA board.

2. The four-channel fiber optic color sensor according to claim 1, characterized in that: The outer casing is formed by fastening together an upper cover and a bottom cover, with the display screen assembly and buttons located on the upper cover.

3. The four-channel fiber optic color sensor according to claim 2, characterized in that: The top cover is fitted with a hinged flap.

4. The four-channel fiber optic color sensor according to claim 3, characterized in that: The upper cover is provided with a display window corresponding to the display screen assembly, and a window piece is pasted on the display window.

5. The four-channel fiber optic color sensor according to claim 4, characterized in that: A light-shielding plate is also provided below the optical path bracket.

6. The four-channel fiber optic color sensor according to claim 5, characterized in that: The bottom shell is also equipped with a U-shaped shielding copper foil, and the optical path support, the second PCBA board and the third PCBA board are all located inside the shielding copper foil.

7. The four-channel fiber optic color sensor according to claim 6, characterized in that: The bottom shell is also equipped with an optical fiber support, on which a locking rod and an optical fiber clamping block are provided. The receiving optical fiber and the transmitting optical fiber pass through the optical fiber support respectively. The locking rod acts on the optical fiber clamping block, and the optical fiber clamping block locks and fixes the receiving optical fiber and the transmitting optical fiber.

8. The four-channel fiber optic color sensor according to claim 7, characterized in that: The bottom of the base shell is provided with a mounting bracket and an S-shaped sliding buckle.

9. The four-channel fiber optic color sensor according to any one of claims 1-8, characterized in that: The optical path support is also equipped with a second photodiode, which is located above the high-transmittance filter lens and the focusing lens. The second photodiode is connected to the third PCBA board and is used to receive some of the internal light source light signals for light intensity monitoring and temperature compensation.

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