Online monitoring type fluorescent penetrant brightness detection device

Abstract

This invention relates to a brightness detection device, specifically to an online monitoring type fluorescent penetrant brightness detection device. It includes a control system and a Y-type transmission fiber optic unit. The Y-type transmission fiber optic unit includes an output branch segment, an input branch segment, and a coupling integrated segment. The output and input branch segments extend to the junction of the coupling integrated segment and interlock from the junction to the insertion end of the coupling integrated segment to form the coupling integrated segment. The control system includes a microprocessor, an ultraviolet LED driving circuit, a display unit, a brightness processing circuit, and a data transmission unit. The display unit, brightness processing circuit, and data transmission unit are electrically connected to the microprocessor. The online monitoring type fluorescent penetrant brightness detection device of this invention is easy to use and can improve the accuracy of brightness measurement for fluorescent penetrants.

Description

Technical Field

[0001] This invention relates to a brightness detection device, specifically, to an online monitoring type fluorescent penetrant brightness detection device. Background Technology

[0002] Penetrant testing is a common non-destructive testing method. It is based on the wetting ability of liquids on solids and capillary action in physics, and is used to detect open defects on the surface of a workpiece. Other common non-destructive testing methods include radiographic testing, ultrasonic testing, magnetic particle testing, and eddy current testing. Among these, penetrant testing is widely used and indispensable in modern industry for achieving product quality management, cost savings, and improved labor productivity.

[0003] Penetrants, removers, and developers are the main materials used in penetrant testing. Among them, penetrants are penetrating solutions with strong penetrating power. They usually contain fluorescent dyes or coloring dyes, which can easily penetrate into the fine defects on the surface of the workpiece and be displayed by the developer, thus revealing the defect traces of the workpiece. Therefore, the quality of the penetrant is one of the key factors affecting the penetrant testing results.

[0004] Penetrants can be divided into colored penetrants and fluorescent penetrants. Penetrants containing fluorescent dyes are called fluorescent penetrants. The effectiveness of fluorescent penetrants is affected by the fluorescence intensity of the fluorescent dye. The higher the fluorescence intensity, the easier it is for the human eye to observe, and the higher the sensitivity of the penetration detection. Therefore, it is necessary to monitor the fluorescence intensity of fluorescent penetrants in experiments in order to study how to improve the fluorescence intensity of fluorescent penetrants.

[0005] In existing technologies, measuring the brightness of fluorescent penetrants usually requires processing the fluorescent penetrant, which is time-consuming. Furthermore, it is inconvenient to prepare samples using filter paper. In addition, during the sample preparation process, inconsistent soaking times and different drying degrees of the filter paper can introduce errors and reduce measurement accuracy.

[0006] In view of this, there is a need to provide an online monitoring device for detecting the brightness of fluorescent penetrants in order to solve or overcome the above-mentioned technical problems. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an online monitoring device for detecting the brightness of fluorescent penetrants. This online monitoring device for detecting the brightness of fluorescent penetrants is easy to use and can improve the accuracy of brightness measurement of fluorescent penetrants.

[0008] To address the aforementioned technical problems, this invention provides an online monitoring device for detecting the brightness of a fluorescent penetrant. This device includes a control system and a Y-type transmission fiber unit. The Y-type transmission fiber unit includes an output branch, an input branch, and a coupling integrated section for insertion into a fluorescent penetrant solution. The output branch includes a central fiber, and the input branch includes multiple peripheral fibers. The output and input branches extend to the junction of the coupling integrated section and are coupled together from the junction to the insertion end of the coupling integrated section to form the coupling integrated section. Within the coupling integrated section, the multiple peripheral fibers are arranged around the periphery of the central fiber. The control system includes a microprocessor, an ultraviolet LED driving circuit for driving an ultraviolet LED and incident the output light from the ultraviolet LED onto the output branch, a display unit for displaying fluorescence brightness measurements, a brightness processing circuit for receiving light signals from the input branch, and a data transmission unit. The display unit, the brightness processing circuit, and the data transmission unit are electrically connected to the microprocessor.

[0009] Preferably, the ultraviolet LED is positioned close to the first fiber optic base so that the output light of the ultraviolet LED can be incident on the first fiber optic base, and the first fiber optic base is connected to the light output branch segment.

[0010] Preferably, a focusing lens for focusing ultraviolet light is provided between the ultraviolet LED and the first optical fiber holder.

[0011] Preferably, the control system further includes a zero-point adjustment unit and a brightness calibration unit. The zero-point adjustment unit includes a zero-point adjustment circuit and a first adjustment switch connected to the zero-point adjustment circuit. The brightness calibration unit includes a brightness calibration circuit and a second adjustment switch connected to the brightness calibration circuit. The zero-point adjustment circuit and the brightness calibration circuit are respectively electrically connected to the microprocessor.

[0012] Preferably, the microprocessor is a single-chip microcomputer.

[0013] Preferably, the zero-point adjustment unit includes a zero-point adjustment circuit, which includes a zero-point potentiometer and a zero-point capacitor. The two ends of the zero-point potentiometer are electrically connected to the power supply, and the center tap of the zero-point potentiometer is electrically connected to the microcontroller. One end of the zero-point capacitor is electrically connected to the center tap, and the other end is grounded.

[0014] Preferably, the brightness calibration unit includes a brightness calibration circuit, which includes a CAL potentiometer and a calibration capacitor. The two ends of the CAL potentiometer are electrically connected to the power supply, and the center tap of the CAL potentiometer is electrically connected to the microcontroller. One end of the calibration capacitor is electrically connected to the center tap, and the other end is grounded.

[0015] Preferably, the brightness processing unit includes a brightness processing circuit, which includes a photodetector, a current-to-voltage conversion unit electrically connected to the photodetector, and a voltage amplification unit electrically connected to the current-to-voltage conversion unit. The output terminal of the voltage amplification unit is electrically connected to the microcontroller.

[0016] Preferably, the photodetector is positioned near the rear end face of the second fiber optic base to receive optical signals from the second fiber optic base, which is connected to the optical input branch segment.

[0017] Preferably, the data transmission unit is connected to an external server via wired or wireless means, so that the measurement data can be displayed and stored in real time through the external server, thereby enabling online monitoring of the fluorescence penetrant brightness.

[0018] Through the above technical solution, the online monitoring fluorescent penetrant brightness detection device of the present invention has at least the following beneficial effects:

[0019] In a basic embodiment of the online monitoring fluorescent penetrant brightness detection device of the present invention, it includes a control system and a Y-type transmission fiber unit. The Y-type transmission fiber unit includes an output branch segment, an input branch segment, and a coupling integrated segment for insertion into the fluorescent penetrant solution. The output branch segment includes a central fiber, and the input branch segment includes multiple peripheral fibers. The output branch segment and the input branch segment extend to the junction end of the coupling integrated segment and are coupled together from the junction end to the insertion end of the coupling integrated segment to form the coupling integrated segment. Within the coupling integrated segment, multiple peripheral fibers are arranged around the outer periphery of the central fiber. The coupling integrated segment of the present invention can be inserted into the fluorescent penetrant to directly measure its fluorescence signal without the need for processing the fluorescent penetrant or preparing a sample, which can save a lot of time and avoid errors introduced by inconsistent filter paper soaking time and different drying degrees during sample preparation, thereby improving measurement accuracy.

[0020] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0021] The following figures are provided to further illustrate the invention and form part of the specification. They, together with the detailed embodiments described below, serve to explain the invention, but the scope of protection of the invention is not limited to the following figures and detailed embodiments. In the figures:

[0022] Figure 1 This is a schematic diagram of a specific embodiment of the online monitoring fluorescent penetrant brightness detection device of the present invention;

[0023] Figure 2 This is a brightness processing circuit diagram of a specific embodiment of the online monitoring fluorescent penetrant brightness detection device of the present invention;

[0024] Figure 3 This is a diagram of an ultraviolet LED driving circuit for a specific embodiment of the online monitoring fluorescent penetrant brightness detection device of the present invention;

[0025] Figure 4 This is a zero-point adjustment circuit diagram and a brightness calibration circuit diagram of a specific embodiment of the online monitoring fluorescent penetrant brightness detection device of the present invention;

[0026] Figure 5 yes Figure 1 Cross-sectional view of the optical output branch segment;

[0027] Figure 6 yes Figure 1 Cross-sectional view of the optical input branch segment;

[0028] Figure 7 yes Figure 1 Cross-sectional view of the intermediate coupled integrated section.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1 control system; 11 microprocessors;

[0031] 12 Display unit; 13 Ultraviolet LED driving circuit;

[0032] 14. Brightness processing unit; 15. Data transmission unit;

[0033] 16 Zero-point adjustment unit; 17 Brightness calibration unit;

[0034] 2Y type transmission fiber unit; 21 optical output branch segments;

[0035] 22 Optical input branch segment; 23 Coupled integration segment;

[0036] 23a. Connecting end; 23b. Insertion end;

[0037] 24. Center fiber optic cable; 25. Peripheral fiber optic cable;

[0038] 3. First fiber optic connector; 4. Second fiber optic connector; Detailed Implementation

[0039] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention, and the scope of protection of the present invention is not limited to the specific embodiments described below.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "electrical connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In the description of this invention, it should be understood that some directional terms used in the following description for the purpose of clearly illustrating the technical solutions of this invention, such as "rear end face," refer to the orientation based on the normal use of the second fiber optic connector. These directional terms are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] See Figure 1 This invention provides an online monitoring device for detecting the brightness of a fluorescent penetrant. The device includes a control system 1 and a Y-type transmission fiber unit 2. The Y-type transmission fiber unit 2 includes an output branch segment 21, an input branch segment 22, and a coupling integrated segment 23 for insertion into a fluorescent penetrant solution. The output branch segment 21 includes a central fiber 24, and the input branch segment 22 includes multiple peripheral fibers 25. The output branch segment 21 and the input branch segment 22 extend to a junction end 23a of the coupling integrated segment 23, and from this junction end 23a to the insertion point of the coupling integrated segment 23... The input ends 23b are combined to form a coupled integrated section 23, in which multiple peripheral optical fibers 25 are arranged around the outer periphery of the central optical fiber 24; and the control system 1 includes a microprocessor 11, an ultraviolet LED driving circuit 13 for driving the ultraviolet LED and incident the ultraviolet LED output light into the light output branch section 21, a display unit 12 for displaying fluorescence brightness measurement values, a brightness processing unit 14 for receiving light signals from the light input branch section 22, and a data transmission unit 15, wherein the display unit 12, the brightness processing unit 14, and the data transmission unit 15 are electrically connected to the microprocessor 11.

[0043] The online monitoring fluorescent penetrant brightness detection device of the present invention can measure and monitor the photofluorescence intensity of the fluorescent penetrant used in penetrant detection. Unlike traditional measurement methods, the online monitoring fluorescent penetrant brightness detection device of the present invention can directly measure the photofluorescence signal intensity of the fluorescent penetrant by directly inserting the insertion end 23b of its coupled integrated section 23 into the fluorescent penetrant. The operation is simple, avoiding the complicated operation process of traditional measurement methods, and does not introduce large errors due to many operation steps, thereby improving measurement accuracy and saving time.

[0044] As can be seen from the above basic implementation method, the online monitoring fluorescent penetrant brightness detection device of the present invention mainly includes two parts: a control system 1 part and a Y-type transmission optical fiber unit 2 part. The control system 1 part is one of the core components of the online monitoring fluorescent penetrant brightness detection device of the present invention. It can excite the fluorescent penetrant to emit photofluorescence signals through the Y-type transmission optical fiber unit 2, and receive the photofluorescence signals through the Y-type transmission optical fiber unit 2, thereby converting and processing the received photofluorescence signals.

[0045] The Y-type transmission fiber unit 2 mainly includes an optical output branch segment 21, an optical input branch segment 22, and a coupling integrated segment 23. The optical output branch segment 21, optical input branch segment 22, and coupling integrated segment 23 are mainly composed of optical fibers. One end of the optical output branch segment 21 and one end of the optical input branch segment 22 are joined at a junction end 23a, and from this junction end 23a, they are interconnected to form the coupling integrated segment 23 to its insertion end 23b. The optical output branch segment 21 can receive and transmit the output light of the ultraviolet LED and couple the output light of the ultraviolet LED to the insertion end 23b of the coupling integrated segment 23. The insertion end 23b of the coupling integrated segment 23 can also receive the photofluorescence signal of the fluorescent penetrant and transmit this photofluorescence signal to the optical input branch segment 22. To receive the photofluorescence signal of the fluorescent penetrant through the insertion end 23b of the coupling integrated segment 23 and transmit it to the optical input branch segment 22, such as... Figures 5 to 7 As shown, the optical output branch segment 21 includes a central optical fiber 24, the optical input branch segment 22 includes multiple peripheral optical fibers 25, and the coupling integration segment 23 includes a central optical fiber 24 and multiple peripheral optical fibers 25. The multiple peripheral optical fibers 25 are arranged around the periphery of the central optical fiber 24. It can be imagined that the central optical fiber 24 can transmit the optical signal of the output light of the ultraviolet LED, and the peripheral optical fibers 25 can transmit the photofluorescent signal of the fluorescent penetrant.

[0046] The control system 1 includes a microprocessor 11, an ultraviolet LED driving circuit 13, a display unit 12, a brightness processing unit 14, and a data transmission unit 15. The ultraviolet LED driving circuit 13 drives the ultraviolet LED to emit light, and the output light from the ultraviolet LED can be incident on the light output branch segment 21. It should be noted that the microprocessor 11 can be an integrated circuit chip, either a single chip or a combination of multiple chips. The ultraviolet LED driving circuit 13 is part of the control system 1, but it is not directly connected to the microprocessor 11. To drive the ultraviolet LED driving circuit, it can be connected to a constant current power supply through an electrical control circuit. Alternatively, the ultraviolet LED driving circuit 13 can be connected to the microprocessor 11 through an electrical control circuit, allowing the microprocessor 11 to drive the ultraviolet LED driving circuit 13. The brightness processing circuit is electrically connected to the microprocessor 11. It receives photofluorescent signals from the fluorescent penetrant and converts these signals into electrical signals, thus converting them into a form that the microprocessor 11 can receive and process. The photofluorescence signal of the fluorescent penetrant is processed by the brightness processing circuit 14 and the microprocessor 11 to obtain the fluorescence brightness measurement value of the fluorescent penetrant. The data transmission unit 15 and the display unit 12 are electrically connected to the microprocessor 11, respectively. The display unit 12 is mainly used to display the fluorescence brightness measurement value. The data transmission unit 15 can perform data transmission. For example, the data transmission unit 15 can be connected to the control computer so that the fluorescence brightness measurement data can be transmitted to the control computer. The control software on the control computer can display and store the measurement data in real time, thereby realizing the function of online monitoring.

[0047] Preferably, from Figure 3The ultraviolet LED driving circuit diagram of a specific embodiment of the online monitoring fluorescent penetrant brightness detection device of the present invention shows that an ultraviolet LED is electrically connected to the circuit. U2, VR1, and R1 form an adjustable reference voltage source, while U3, Q1, and their peripheral components form a constant current source. The basic working process of the ultraviolet LED driving circuit is as follows: VR1 is adjusted to a certain voltage value, and this reference voltage is connected to the non-inverting input terminal 3 of U3A via R2. The operating current of the ultraviolet LED is sampled by R5 and converted into a voltage signal. After being amplified by U3B, R6, and R7, it is connected to the inverting input terminal 2 of U3A. An error comparison is made with the reference voltage at pin 3 of U3A. After amplification by U3A, this error voltage controls the on-resistance of the field-effect transistor Q1, thereby keeping the operating current of the ultraviolet LED constant. The output irradiance of the ultraviolet LED needs to be set according to "8.6.2.1 Fluorescent Penetration" in GB / T18851.1-2012 Nondestructive Testing Penetration Testing Part 1: General Rules. The operation can be performed as follows: First, make perpendicular contact between the end face of the insertion end 23b of the Y-type transmission fiber unit 2 and the probe surface of the standard radiometer (such as the UV-A ultraviolet radiometer from Beijing Normal University Optoelectronic Instrument Factory). Then, adjust VR1 so that the reading of the standard radiometer is ≥1000 μW / cm². 2 This completes the setting of the output irradiance of the ultraviolet LED.

[0048] The ultraviolet LED is positioned close to the first fiber optic base 3, which is connected to the light output branch section 21. This allows the output light from the ultraviolet LED to be incident on the first fiber optic base 3 and then transmitted to the light output branch section 21 via the first fiber optic base 3.

[0049] In order to focus the output light of the ultraviolet LED, a focusing lens is set between the ultraviolet LED and the first fiber optic mount 3 to focus the ultraviolet light. For example, a quartz focusing lens can be used for focusing.

[0050] Preferably, the control system 1 further includes a zero-point adjustment unit 16 for zero-point adjustment and a brightness calibration unit 17 for brightness calibration. The zero-point adjustment unit 16 includes a zero-point adjustment circuit and a first adjustment switch connected to the zero-point adjustment circuit. The brightness calibration unit 17 includes a brightness calibration circuit and a second adjustment switch connected to the brightness calibration circuit. The zero-point adjustment circuit and the brightness calibration circuit are electrically connected to the microprocessor 11, respectively. It should be noted that the first adjustment switch can be a knob or a button. In order to reduce the error caused by stray visible light from the outside, the zero-point adjustment circuit can reset the fluorescence brightness measurement value of the fluorescent penetrant signal to zero by rotating or pressing the first adjustment switch in the absence of ultraviolet light. Before the online monitoring fluorescent penetrant brightness detection device of the present invention is used normally, the first adjustment switch needs to be used for zero-point adjustment. Furthermore, before the online monitoring fluorescent penetrant brightness detection device of the present invention can be used normally, brightness calibration is required. The brightness calibration circuit can adjust the brightness measurement value of the photofluorescence signal of the fluorescent penetrant through the second adjustment switch, which can be a knob or a button. During brightness calibration, the online monitoring fluorescent penetrant brightness detection device of the present invention must first be powered on, and then the insertion end 23b of its coupling integrated section 23 is inserted into the fluorescent penetrant. In this state, the brightness calibration circuit can set the fluorescence brightness measurement value of the fluorescent penetrant to "80" by rotating or pressing the second adjustment switch, thereby completing the brightness calibration process. The zero-point adjustment and brightness calibration process meet the test requirements in "7 Test Method" of the standard GB / T 33877-2017 Nondestructive Testing Method for Determination of Brightness of Fluorescent Penetrant. Under normal circumstances, before the online monitoring fluorescent penetrant brightness detection device of the present invention can be used normally, brightness calibration is completed first, and then zero-point adjustment is completed.

[0051] Preferably, the microprocessor 11 can be a single-chip microcomputer.

[0052] Preferably, the zero-point adjustment unit 16 includes a zero-point adjustment circuit, such as... Figure 4 As shown, the zero-point adjustment circuit includes a zero-point potentiometer and a zero-point capacitor. One fixed terminal of the zero-point potentiometer is connected to the power supply voltage Vcc, and its other fixed terminal is grounded. The center tap is connected to the microcontroller. Figure 4 As can be seen, the center tap can be connected to the input terminal of ADC1 of the microcontroller U6.

[0053] Preferably, the brightness calibration unit 17 includes a brightness calibration circuit, such as... Figure 4 As shown, the brightness calibration circuit includes a CAL (calibration) potentiometer and a calibration capacitor. One fixed terminal of the CAL potentiometer is connected to the power supply voltage Vcc, and its other fixed terminal is grounded. The center tap is connected to the microcontroller. Figure 4As can be seen, the center tap can be connected to the input terminal of ADC2 of the microcontroller U6.

[0054] Preferably, the brightness processing unit 14 includes a brightness processing circuit, from Figure 2 and Figure 4 As can be seen, the brightness processing circuit includes a photodetector, a current-to-voltage conversion unit electrically connected to the photodetector, and a voltage amplification unit electrically connected to the current-to-voltage conversion unit. The output of the voltage amplification unit is electrically connected to the microcontroller.

[0055] Preferably, the photodetector is positioned close to the rear end face of the second fiber optic connector 4, and the second fiber optic connector 4 is connected to the optical input branch segment 22 to receive the photofluorescence signal from the second fiber optic connector 4. The specific operation of the brightness processing circuit is as follows:

[0056] Under irradiation with 365nm ultraviolet light from an ultraviolet (UV) LED, the fluorescent penetrant being tested emits a photofluorescent signal. This signal is received by the coupling integration segment 23 and transmitted to the second fiber optic connector 4 via the light input branch segment 22. Then, the brightness processing circuit converts the photofluorescent signal into an electrical signal. For example, Figure 2 As shown, photodetector D2 can be connected to the rear end face of the second fiber optic connector 4. Under fluorescence irradiation, photodetector D2 will generate a photocurrent proportional to the fluorescence illuminance. This photocurrent is converted into a photovoltage signal by a current-to-voltage converter composed of operational amplifier U4A, R8, and C11. Operational amplifier U4B and R9 to R11 amplify this photovoltage signal, generating a voltage signal proportional to the fluorescence illuminance at the output terminal 7 of U4B. This voltage signal is then sent to the ADC0 of the microcontroller U6 for processing.

[0057] Preferably, in order to monitor the fluorescence brightness measurement data of the fluorescent penetrant in real time, the data transmission unit 15 can be connected to an external server via wired or wireless connection. The external server can display and store the measurement data in real time, thereby achieving the purpose of monitoring the fluorescence brightness of the fluorescent penetrant online.

[0058] As can be seen from the above description, the advantages of this invention are:

[0059] (1) The Y-type transmission fiber unit 2 of the online monitoring fluorescent penetrant brightness detection device of the present invention can be directly inserted into the fluorescent penetrant, which can completely eliminate the influence of reflection, refraction, transmission and other factors on the fluorescent signal at the fluorescent penetrant / air interface or the fluorescent penetrant container / air interface, and improve the measurement accuracy.

[0060] (2) The present invention can directly measure the photofluorescence signal of the fluorescent penetrant without the need to process the fluorescent penetrant, which can save a lot of time and reduce the errors introduced by inconsistent filter paper soaking time and different drying degrees in the sample preparation process of the prior art, thus improving the measurement accuracy;

[0061] (3) Since the present invention uses optical fiber to transmit optical signals, it does not require a dedicated sample chamber. The capacity of the control system 1 can be miniaturized and micronized, thus becoming a portable device that is convenient to use.

[0062] (4) This invention can measure and read data in real time and online, and can even be integrated with the fluorescent penetrant detection cell to reduce user costs; at the same time, it can be combined with software control to easily realize alarm functions for information such as unqualified fluorescent penetrant brightness and need to be replaced, which is convenient to use.

[0063] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0064] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0065] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. An online monitoring device for detecting the brightness of a fluorescent penetrant, characterized in that, The online monitoring fluorescent penetrant brightness detection device includes a control system (1) and a Y-type transmission fiber unit (2), wherein... The Y-type transmission fiber unit (2) includes an optical output branch segment (21), an optical input branch segment (22), and a coupling integrated segment (23) for directly measuring the photofluorescence signal intensity of the fluorescent penetrant in a solution of the fluorescent penetrant. The optical output branch segment (21) includes a central fiber (24), and the optical input branch segment (22) includes multiple peripheral fibers (25). The optical output branch segment (21) and the optical input branch segment (22) extend to the junction end (23a) of the coupling integrated segment (23) and are joined together from the junction end (23a) to the insertion end (23b) of the coupling integrated segment (23) to form the coupling integrated segment (23). Multiple peripheral fibers (25) are arranged around the outer periphery of the central fiber (24) within the coupling integrated segment (23). The control system (1) includes a microprocessor (11), an ultraviolet LED driving circuit (13) for driving an ultraviolet LED and incident the output light of the ultraviolet LED onto the light output branch segment (21), a display unit (12) for displaying fluorescence brightness measurement values, a brightness processing unit (14) for receiving light signals from the light input branch segment (22) and converting them into electrical signals, and a data transmission unit (15) for data transmission. The ultraviolet LED driving circuit is electrically connected to the ultraviolet LED and includes an adjustable reference voltage source and a constant current source. The display unit (12), the brightness processing unit (14), and the data transmission unit (15) are electrically connected to the microprocessor (11). The control system (1) further includes a zero-point adjustment unit (16) and a brightness calibration unit (17). The zero-point adjustment unit (16) includes a zero-point adjustment circuit and a first adjustment switch connected to the zero-point adjustment circuit. The brightness calibration unit (17) includes a brightness calibration circuit and a second adjustment switch connected to the brightness calibration circuit. The zero-point adjustment circuit and the brightness calibration circuit are electrically connected to the microprocessor (11) respectively, and are used to perform zero-point adjustment and brightness calibration respectively before measurement to meet the test requirements of fluorescence penetrant brightness measurement. The brightness calibration unit (17) includes a brightness calibration circuit, which includes a CAL potentiometer and a calibration capacitor. The two ends of the CAL potentiometer are electrically connected to the power supply, and the center tap of the CAL potentiometer is electrically connected to the microcontroller. One end of the calibration capacitor is electrically connected to the center tap, and the other end is grounded.

2. The online monitoring fluorescent penetrant brightness detection device according to claim 1, characterized in that, The ultraviolet LED is positioned close to the first optical fiber holder (3) so that the output light of the ultraviolet LED can be incident on the first optical fiber holder (3), and the first optical fiber holder (3) is connected to the light output branch segment (21).

3. The online monitoring fluorescent penetrant brightness detection device according to claim 2, characterized in that, A focusing lens for focusing ultraviolet light is provided between the ultraviolet LED and the first optical fiber holder (3).

4. The online monitoring fluorescent penetrant brightness detection device according to claim 1, characterized in that, The microprocessor (11) is a single-chip microcomputer.

5. The online monitoring fluorescent penetrant brightness detection device according to claim 4, characterized in that, The zero-point adjustment unit (16) includes a zero-point adjustment circuit, which includes a zero-point potentiometer and a zero-point capacitor. The two ends of the zero-point potentiometer are electrically connected to the power supply, and the center tap of the zero-point potentiometer is electrically connected to the microcontroller. One end of the zero-point capacitor is electrically connected to the center tap, and the other end is grounded.

6. The online monitoring fluorescent penetrant brightness detection device according to claim 4, characterized in that, The brightness processing unit (14) includes a brightness processing circuit, which includes a photodetector, a current-to-voltage conversion unit electrically connected to the photodetector, and a voltage amplification unit electrically connected to the current-to-voltage conversion unit. The output terminal of the voltage amplification unit is electrically connected to the microcontroller.

7. The online monitoring fluorescent penetrant brightness detection device according to claim 6, characterized in that, The photodetector is positioned close to the rear end face of the second fiber optic base (4) to receive optical signals from the second fiber optic base (4), which is connected to the optical input branch segment (22).

8. The online monitoring fluorescent penetrant brightness detection device according to claim 1, characterized in that, The data transmission unit (15) is connected to an external server via wired or wireless means, so that the measurement data can be displayed and stored in real time through the external server, thereby enabling online monitoring of the brightness of the fluorescent penetrant.

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