A structural coating surface lightning discharge high voltage measurement optical fiber probe

Abstract

This invention discloses a fiber optic probe for measuring high-voltage lightning discharge on a structural coating surface, comprising: a measuring probe, an input insulator, an input copper plate, a middle insulator, a middle copper plate, a Mara tape, a copper ring, a differentiator resistor plate, a nylon column, a high-voltage non-inductive resistor assembly, an integrator capacitor plate, an integrating capacitor supporting copper plate, a photoelectric conversion plate, a fiber laser diode, an output copper plate, and a housing. This invention can measure the voltage during arc discharge on the coating surface and characterize the lightning protection performance of the coating.

Description

Technical Field

[0001] This invention belongs to the field of coating performance measurement technology in new materials and new energy, and particularly relates to a fiber optic probe for measuring high voltage lightning discharge on the surface of structural coatings. Background Technology

[0002] Lightning protection coatings are now being applied to the lightning protection of non-metallic surfaces of aircraft, rockets, automobiles, and other devices. As a conductive composite material composed of resin and conductive fillers, its ability to suppress lightning voltage is one of its most important fundamental parameters, because only when this voltage is suppressed sufficiently low can the protected non-metallic material be prevented from breaking down. However, the process of the coating under arc discharge is extremely complex, especially since the induced plasma conductive channel involves the coupling of multiple physical fields such as fluid, plasma, electricity, and heat. Its surface voltage is currently difficult to quantitatively design theoretically; therefore, this performance indicator needs to be obtained through lightning arc injection experiments.

[0003] However, measuring the voltage on the coating surface is also quite challenging, mainly due to the following aspects: 1) Strong magnetic field interference during high-current discharge can easily overwhelm the measurement signal; 2) High instantaneous voltage during lightning discharge can easily lead to discharge breakdown if the probe is poorly designed; 3) The voltage waveform has a certain transient nature, requiring the measurement probe to have a certain bandwidth. Therefore, it is necessary to design an adaptive approach to the characteristics of lightning discharge in order to achieve accurate measurement of lightning discharge voltage. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a fiber optic probe for measuring high voltage lightning discharge on the surface of a structural coating, which can measure the voltage during arc discharge on the coating surface and characterize the lightning protection performance of the coating.

[0005] The objective of this invention is achieved through the following technical solution: A fiber optic probe for measuring high-voltage lightning discharge on a structured coating surface, comprising: a measuring probe, an input insulator, an input copper plate, a middle insulator, a middle copper plate, a Marlboro tape, a copper ring, a differentiator resistor plate, a nylon column, a high-voltage non-inductive resistor assembly, an integrator capacitor plate, an integrating capacitor supporting copper plate, a photoelectric conversion plate, a fiber laser diode, an output copper plate, and a housing; wherein, one end of the measuring probe passes through the middle of the input insulator and contacts the input copper plate; the input insulator is located inside the housing and is connected to the middle insulator; the input insulator seals one end of the housing; the input copper plate is disposed in a first inner groove of the input insulator; the outer surface of the middle insulator contacts the inner surface of the input insulator and the inner surface of the input copper plate, respectively, and the middle insulator is connected to the copper ring; the middle copper plate is disposed in a second inner groove of the middle insulator, and the middle... The copper plate is connected to the Malakaloid tape; the outer surface of the Malakaloid tape contacts the inner surface of the middle insulator and the inner surface of the middle copper plate, respectively; the Malakaloid tape is connected to the copper ring; the outer peripheral end of the copper ring is connected to the inner wall of the housing; the differentiator resistor plate is connected to the copper ring; one end of the nylon column is connected to the differentiator resistor plate, and the other end of the nylon column is connected to the integrator capacitor plate; the length direction of the nylon column is parallel to the axial direction of the housing; one end of the high-voltage non-inductive resistor assembly is connected to the differentiator resistor plate, and the other end of the high-voltage non-inductive resistor assembly is connected to the integrator capacitor plate; the integrator capacitor plate is connected to the integrating capacitor support copper plate; the outer peripheral end of the integrating capacitor support copper plate is connected to the inner wall of the housing; the photoelectric conversion plate is connected to the integrating capacitor support copper plate; the output copper plate is connected to the other end of the housing; one end of the fiber laser diode passes through the output copper plate and contacts the photoelectric conversion plate.

[0006] The fiber optic probe for measuring high voltage lightning discharge on the surface of the above-mentioned structure coating also includes a photodetector; wherein the photodetector is connected to the other end of the fiber laser diode.

[0007] In the fiber optic probe for measuring high voltage lightning discharge on the surface of the above-mentioned structure coating, the input end insulator includes a rotating body and a boss; wherein, the boss is connected to the outer surface of the rotating body; and a first inner groove is formed on the inner surface of the rotating body.

[0008] One end of the measuring probe passes through the rotating body and contacts the input copper plate.

[0009] In the fiber optic probe for measuring high voltage lightning discharge on the surface of the above-mentioned structure coating, the differentiator resistor plate is a double-sided PCB board, and the differentiator resistor plate is equipped with multiple packaged resistors, which are connected in parallel.

[0010] In the fiber optic probe for measuring high voltage lightning discharge on the surface of the above-mentioned structure coating, the resistance value of each encapsulated resistor is 20K-50K ohms.

[0011] In the fiber optic probe for measuring high voltage lightning discharge on the surface of the above-mentioned structure coating, the high-voltage non-inductive resistor combination includes 2-3 high-voltage non-inductive resistors; wherein, the 2-3 high-voltage non-inductive resistors are connected in series.

[0012] In the fiber optic probe for measuring high voltage lightning discharge on the surface of the above-mentioned structure coating, the resistance of the high voltage non-inductive resistor combination is 10K-50K ohms.

[0013] In the fiber optic probe for measuring high voltage lightning discharge on the surface of the above-mentioned structure coating, the integrator capacitor plate is a double-sided PCB board, and multiple capacitors are installed on the integrator capacitor plate in parallel.

[0014] In the fiber optic probe for high-voltage lightning discharge measurement on the surface of the above-mentioned structure coating, resistors R1, R2, and R3, capacitor C1, and operational amplifier U2 are mounted on the photoelectric conversion board. One end of capacitor C1 is connected to the housing, and the other end of capacitor C1 is connected to the positive input terminal of operational amplifier U2. Resistors R1 and R3 are connected, and both resistors R1 and R3 are connected to the positive input terminal of operational amplifier U2. The inverting input terminal of operational amplifier U2 is connected to the output terminal of operational amplifier U2. One end of resistor R2 is connected to the output terminal of operational amplifier U2, and the other end of resistor R2 is connected to the positive terminal of the fiber laser diode.

[0015] In the fiber optic probe for measuring high voltage lightning discharge on the surface of the above-mentioned structure coating, the photodetector includes a resistor R4, a capacitor C2, a capacitor C3, a diode D2, and an amplifier U1; wherein, the resistor R4 is connected to the negative terminal of the diode D2, one end of the capacitor C2 is connected between the resistor R4 and the diode D2, the other end of the capacitor C2 is connected to the input terminal of the amplifier U1, and the output terminal of the amplifier U1 is connected to the capacitor C3.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] (1) The present invention can be used to measure the voltage during arc discharge on the coating surface and is applicable to lightning discharge current environments up to 200KA, and is used to characterize the lightning protection performance of the coating.

[0018] (2) The entire structure of the present invention is very compact, without any flying wires or other links that generate large distributed inductance, and the waveform distortion is small, which can complete the measurement of microsecond-level transient pulses caused by lightning.

[0019] (3) The entire structure of the present invention is well shielded by the shell, has good electromagnetic compatibility, and can measure the discharge voltage of the coating under extremely strong magnetic field interference.

[0020] (4) The entire structure of the present invention has good mechanical strength. The shell is fixed on the substrate of the test piece, and the coating will not be subjected to additional stress under the action of lightning strike, which can avoid the coating being torn due to the force of the probe.

[0021] (5) The entire structure of the present invention has high insulation strength, and the insulation at the input end can reach tens of kilovolts, which can meet the measurement of coating voltage under 200KA arc discharge as specified in the standard. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the fiber optic probe for measuring high voltage lightning discharge on the surface of the structural coating provided in this embodiment of the invention;

[0024] Figure 2 This is a schematic diagram of the structure of the input terminal insulator provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the input copper plate provided in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the insulator provided in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the copper plate provided in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the copper ring provided in an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the connection of the resistors set on the differentiator resistor plate provided in the embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the capacitor connections on the integrator capacitor board provided in an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the copper plate supporting the integrating capacitor provided in an embodiment of the present invention;

[0032] Figure 10 This is a schematic diagram showing the connection of the components on the photoelectric conversion board provided in the embodiment of the present invention;

[0033] Figure 11 This is a schematic diagram of the connection of the output copper plate provided in an embodiment of the present invention;

[0034] Figure 12 This is a schematic diagram of the connection of the housing provided in an embodiment of the present invention;

[0035] Figure 13 This is a circuit diagram of the photoelectric receiver provided in an embodiment of the present invention;

[0036] Figure 14 This is a schematic diagram of the equivalent circuit of the voltage divider section provided in an embodiment of the present invention;

[0037] Figure 15 This is a schematic diagram illustrating the method of using the probe provided in an embodiment of the present invention. Detailed Implementation

[0038] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] Figure 1 This is a schematic diagram of the structure of the fiber optic probe for measuring high-voltage lightning discharge on the surface of the structural coating provided in an embodiment of the present invention. Figure 1 As shown, the fiber optic probe for measuring high voltage lightning discharge on the coated surface is characterized by comprising: a measuring probe 1, an input insulator 2, an input copper plate 3, a middle insulator 4, a middle copper plate 5, a Mauser tape 6, a copper ring 7, a differentiator resistor plate 8, a nylon column 9, a high-voltage non-inductive resistor assembly 10, an integrator capacitor plate 11, an integrating capacitor support copper plate 12, a photoelectric conversion plate 13, a fiber laser diode 14, an output copper plate 15, and a housing 16.

[0040] One end of the measuring probe 1 passes through the middle of the input insulator 2 and contacts the input copper plate 3; the input insulator 2 is located inside the housing 16 and is connected to the middle insulator 4; the input insulator 2 seals one end of the housing 16; the input copper plate 3 is disposed in the first inner groove of the input insulator 2; the outer surface of the middle insulator 4 contacts the inner surface of the input insulator 2 and the inner surface of the input copper plate 3 respectively, and the middle insulator 4 is connected to the copper ring 7; the middle copper plate 5 is disposed in the second inner groove of the middle insulator 4 and is connected to the rubber band 6; the outer surface of the rubber band 6 contacts the inner surface of the middle insulator 4 and the inner surface of the middle copper plate 5 respectively, and the rubber band 6 is connected to the copper ring 7; the outer peripheral end of the copper ring 7 is connected to the housing 16. The inner wall of the housing 16 is connected to the differentiator resistor plate 8 and the copper ring 7; one end of the nylon column 9 is connected to the differentiator resistor plate 8 and the other end of the nylon column 9 is connected to the integrator capacitor plate 11, and the length direction of the nylon column 9 is parallel to the axis of the housing 16; one end of the high-voltage non-inductive resistor assembly 10 is connected to the differentiator resistor plate 8 and the other end of the high-voltage non-inductive resistor assembly 10 is connected to the integrator capacitor plate 11; the integrator capacitor plate 11 is connected to the integrating capacitor support copper plate 12; the outer peripheral end of the integrating capacitor support copper plate 12 is connected to the inner wall of the housing 16; the photoelectric conversion plate 13 is connected to the integrating capacitor support copper plate 12; the output copper plate 15 is connected to the other end of the housing 16; one end of the fiber laser diode 14 passes through the output copper plate 15 and contacts the photoelectric conversion plate 13.

[0041] The fiber optic probe for measuring high voltage lightning discharge on the surface of the structure coating also includes a photodetector; wherein the photodetector is connected to the other end of the fiber laser diode 14.

[0042] like Figure 1 As shown, the measuring probe 1 is a copper needle with a diameter of 1 mm, made of H59 or H62 brass, used to pass through the object being measured to reach its coated upper surface and measure its voltage.

[0043] like Figure 2 As shown, the input insulator 2 includes a rotating body and a boss; the boss is connected to the outer surface of the rotating body; a first inner groove is formed on the inner surface of the rotating body; one end of the measuring probe 1 passes through the rotating body and contacts the input copper plate 3. Specifically, the input insulator 2 is made of PA66 nylon and is a rotating body with a recess and a boss, which is used to keep the measured object isolated from the measuring probe 1 and other circuits inside the probe.

[0044] like Figure 3 As shown, the input copper plate 3 is a circular plate with a center hole made of H59 or H62 brass, used to form a differentiator capacitor together with the middle insulator 4 and the middle copper plate 5.

[0045] like Figure 4As shown, the middle insulator 4 is made of polytetrafluoroethylene and is a rotating body with a recess. It is used to form a differentiator capacitor with the input copper plate 3 and the middle copper plate 5. The minimum thickness is about 2mm and the diameter is about 20mm. The contact surface between it and the input copper plate 3 and the input insulator 2 is coated with 705 silicone rubber for insulation.

[0046] like Figure 5 As shown, the middle copper plate 5 is a circular plate with a center hole made of H59 or H62 brass, used to form a differentiator capacitor together with the input copper plate 3 and the middle insulator 4. The middle copper plate 5 is connected to the differentiator resistor plate 8 by screws. The middle copper plate 5 and the copper ring 7 are insulated by a thin film of Mylar tape.

[0047] Mara tape 6 is cut into circular pieces from sufficiently wide tape and adhered to the surface of copper ring 7. A hole is punched in the center of the tape for the screw connecting the intermediate copper plate 5 and the differentiator resistor plate 8 to pass through. Mara tape 6 serves two purposes: firstly, it provides insulation between the intermediate copper plate 5 and the copper ring 7; secondly, it forms a capacitance between the intermediate copper plate 5 and the housing, which can suppress potential spikes in the high-frequency response caused by the distributed parameters of components such as resistors and capacitors.

[0048] like Figure 6 As shown, the copper ring 7 is made of H59 or H62 brass and is connected to the housing 16 by screws to support the differentiator resistor plate 8.

[0049] like Figure 7 As shown, the differentiator resistor board 8 is a double-sided PCB board. Multiple packaged resistors are mounted on the differentiator resistor board 8, and these resistors are connected in parallel. Specifically, the differentiator resistor board 8 is a 0.8mm thick double-sided PCB board on which eight 2512 packaged resistors (approximately 20K-50K) are mounted. Their centers are connected to the middle copper plate 5 via screws, and it functions as a resistor in the differentiator.

[0050] The nylon pillar 9 consists of four standard M3 nylon pillars used to provide the spacing between the differentiator resistor plate 8 and the integrator capacitor plate 10.

[0051] The high-voltage non-inductive resistor assembly 10 includes 2-3 high-voltage non-inductive resistors, which are connected in series. The total resistance of the high-voltage non-inductive resistor assembly 10 is between 10K and 50K, and it functions as the resistor in the integrator.

[0052] like Figure 8 As shown, the integrator capacitor board 11 is a double-sided PCB board, on which multiple capacitors are mounted and connected in parallel. The integrator capacitor board 11 is a 0.8mm thick double-sided PCB board, on which 8-16 approximately 100V NPO or C0G material 100pF capacitors are mounted. The capacitors are connected between the output terminal of resistor 10 and the case ground, acting as capacitors for the integrator.

[0053] like Figure 9 As shown, the integrating capacitor support copper plate 12 is a circular plate made of H59 or H62 brass, which is connected to the housing 16 by screws. It has an axial circular hole for supporting the integrator capacitor plate 12 and the photoelectric conversion plate 13, and for providing grounding for them.

[0054] like Figure 10 As shown, the photoelectric conversion board 13 is equipped with resistors R1, R2, and R3, capacitor C1, and operational amplifier U2. One end of capacitor C1 is connected to the housing 16 (providing it with ground), and the other end of capacitor C1 is connected to the positive input terminal of operational amplifier U2. Resistors R1 and R3 are connected, both to the positive input terminal of operational amplifier U2. The inverting input terminal of operational amplifier U2 is connected to its output terminal. One end of resistor R2 is connected to the output terminal of operational amplifier U2, and the other end of resistor R2 is connected to the positive terminal of fiber laser diode 14. The photoelectric conversion board 13 is used to convert the integrated electrical pulses into optical signals by driving the fiber laser diode.

[0055] The fiber laser diode 14 is a fiber laser diode with a wavelength of 1310nm, a speed of 155MHz or higher, and an output connector of FC-APC.

[0056] like Figure 11 As shown, the output copper plate is made of H59 or H62 brass and is used to support the fiber laser diode 14.

[0057] like Figure 12 As shown, housing 16 is made of H59 or H62 brass and is used to provide shielding and grounding for the entire probe and to connect to the substrate of the test piece.

[0058] like Figure 13 As shown, the photodetector includes a resistor R4, a capacitor C2, a capacitor C3, a diode D2, and an amplifier U1; wherein, the resistor R4 is connected to the negative terminal of the diode D2, one end of the capacitor C2 is connected between the resistor R4 and the diode D2, the other end of the capacitor C2 is connected to the input terminal of the amplifier U1, and the output terminal of the amplifier U1 is connected to the capacitor C3.

[0059] The photodetector is connected to the fiber laser diode 14 via a single-mode optical fiber, and the output of the photodetector is connected to a conventional oscilloscope.

[0060] This embodiment includes a pair of cascaded differentiators (capacitor + resistor) and integrators (resistor + capacitor) that function as voltage dividers. Its equivalent circuit is as follows: Figure 14As shown in the diagram. The input copper plate 3, the middle insulator 4, and the middle copper plate 5 form the differentiator capacitor C1; the differentiator resistor plate 8 is the differentiator resistor R1; the high-voltage non-inductive resistor 10 is the integrator resistor R2; and the integrator capacitor plate 11 is the integrator capacitor C2.

[0061] It should be understood that the grounding shown in the attached diagram is connected to the housing 16.

[0062] Calibration is performed using a pulse generator conforming to waveform 1 in SAE ARP 5416 "Aircraft Lightning Test Methods". The output terminal of the pulse generator and ground are connected to probe 1 and housing 16, respectively. When the pulse generator emits a voltage pulse with a peak value of V1, the peak value V2 is obtained by measuring the output voltage waveform of the photodetector. The coefficient K of the probe can then be obtained as K = V1 / V2.

[0063] The working principle of the fiber optic probe device for high-voltage lightning discharge measurement on the surface of the coating structure is as follows:

[0064] (1) The sample of the coating under test consists of a metal substrate (a), a non-metallic layer (b), and the coating under test (c). For example... Figure 15 .

[0065] (2) A circular hole is opened on the metal substrate a for inserting the boss of the input end insulator 2 of the probe.

[0066] (3) The non-metallic layer b can be any insulating material with a certain insulation strength and compatible with the coating being tested, such as silicone rubber, etc. It can be flush with the boss or cover the boss.

[0067] (4) The coating to be tested, c, is applied to the surface of the non-metallic layer. The probe extending beyond the coating can be cut off.

[0068] (5) After connecting the probe to the optical fiber, photoelectric receiver and oscilloscope, it can be placed in the lightning test facility that conforms to the SAE ARP5416 "Aircraft Lightning Test Method".

[0069] (6) In accordance with the standard requirements, both the metal substrate and the coating to be tested are grounded, the discharge electrode e is placed above the probe (1), and the thin metal wire for arc initiation hangs over the surface of the coating to be tested and is aligned with the probe.

[0070] (7) When the lightning test facility discharges, the output of the photodetector is collected by an oscilloscope and multiplied by the probe coefficient to obtain the voltage waveform of the discharge process. The peak value of the waveform is the lightning discharge voltage on the coating surface.

[0071] This invention can be used to measure the voltage of an arc discharge on a coating surface, and is applicable to lightning discharge current environments up to 200kA, for characterizing the lightning protection performance of the coating. The entire structure of this invention is very compact, without any flying wires or other components that generate large distributed inductance, resulting in low waveform distortion and the ability to measure microsecond-level transient pulses induced by lightning. The entire structure of this invention is well shielded by the housing, exhibiting excellent electromagnetic compatibility, and can achieve the measurement of coating discharge voltage even under extremely strong magnetic field interference. The entire structure of this invention has good mechanical strength; the housing is fixed to the substrate of the test piece, preventing additional stress on the coating under lightning impact and avoiding tearing of the coating due to probe stress. The entire structure of this invention has high insulation strength, with input insulation reaching tens of kilovolts, meeting the standard requirements for measuring coating voltage under 200kA arc discharge.

[0072] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A fiber optic probe for measuring high voltage lightning discharge on a structurally coated surface, characterized in that... include: The components include: a measuring probe (1), an input insulator (2), an input copper plate (3), a middle insulator (4), a middle copper plate (5), a Mara tape (6), a copper ring (7), a differentiator resistor plate (8), a nylon column (9), a high-voltage non-inductive resistor assembly (10), an integrator capacitor plate (11), an integrating capacitor support copper plate (12), a photoelectric conversion board (13), a fiber laser diode (14), an output copper plate (15), and a housing (16); among which, One end of the measuring probe (1) passes through the input insulator (2) and contacts the input copper plate (3); The input insulator (2) is located inside the housing (16), and the input insulator (2) is connected to the middle insulator (4); the input insulator (2) seals one end of the housing (16); The input end copper plate (3) is disposed in the first inner groove of the input end insulator (2); The outer surface of the middle insulator (4) is in contact with the inner surface of the input end insulator (2) and the inner surface of the input end copper plate (3), respectively, and the middle insulator (4) is connected to the copper ring (7); The middle copper plate (5) is disposed in the second inner groove of the middle insulator (4), and the middle copper plate (5) is connected to the Mara tape (6); The outer surface of the Malak tape (6) is in contact with the inner surface of the middle insulator (4) and the inner surface of the middle copper plate (5), respectively, and the Malak tape (6) is connected to the copper ring (7); The outer peripheral end of the copper ring (7) is connected to the inner wall of the shell (16); The differentiator resistor plate (8) is connected to the copper ring (7); One end of the nylon column (9) is connected to the differentiator resistor plate (8), and the other end of the nylon column (9) is connected to the integrator capacitor plate (11). One end of the high-voltage non-inductive resistor assembly (10) is connected to the differentiator resistor plate (8), and the other end of the high-voltage non-inductive resistor assembly (10) is connected to the integrator capacitor plate (11). The integrator capacitor plate (11) is connected to the integrator capacitor support copper plate (12); The outer periphery of the integral capacitor supporting copper plate (12) is connected to the inner wall of the housing (16); The photoelectric conversion board (13) is connected to the integrating capacitor support copper plate (12); The output copper plate (15) is connected to the other end of the housing (16); One end of the fiber laser diode (14) passes through the output copper plate (15) and contacts the photoelectric conversion plate (13).

2. The fiber optic probe for measuring high voltage lightning discharge on the surface of the structural coating as described in claim 1, characterized in that... Also includes: A photodetector; wherein the photodetector is connected to the other end of the fiber laser diode (14).

3. The fiber optic probe for measuring high voltage lightning discharge on the surface of the structural coating according to claim 1, characterized in that: The input insulator (2) includes a rotating body and a boss; wherein, The boss is connected to the outer surface of the rotating body; The inner surface of the rotating body is provided with a first inner groove; One end of the measuring probe (1) passes through the rotating body and contacts the input copper plate (3).

4. The fiber optic probe for measuring high voltage lightning discharge on the surface of the structural coating according to claim 1, characterized in that: The differentiator resistor board (8) is a double-sided PCB board, and multiple packaged resistors are installed on the differentiator resistor board (8), with the multiple packaged resistors connected in parallel.

5. The fiber optic probe for measuring high voltage lightning discharge on the surface of the structural coating according to claim 4, characterized in that: Each packaged resistor has a resistance value of 20K-50K ohms.

6. The fiber optic probe for measuring high voltage lightning discharge on the surface of the structural coating according to claim 1, characterized in that: The high-voltage non-inductive resistor combination (10) includes 2-3 high-voltage non-inductive resistors; wherein, the 2-3 high-voltage non-inductive resistors are connected in series.

7. The fiber optic probe for measuring high voltage lightning discharge on the surface of the structural coating according to claim 6, characterized in that: The resistance of the high-voltage non-inductive resistor combination is 10K-50K ohms.

8. The fiber optic probe for measuring high voltage lightning discharge on the surface of the structural coating according to claim 1, characterized in that: The integrator capacitor board (11) is a double-sided PCB board, and multiple capacitors are installed on the integrator capacitor board (11) in parallel.

9. The fiber optic probe for measuring high voltage lightning discharge on the surface of the structural coating according to claim 1, characterized in that: The photoelectric conversion board (13) is equipped with resistors R1, R2, R3, capacitor C1, and operational amplifier U2; among which, One end of the capacitor C1 is connected to the housing (16), and the other end of the capacitor C1 is connected to the positive input terminal of the operational amplifier U2. Resistors R1 and R3 are connected, and both resistors R1 and R3 are connected to the positive input terminal of the operational amplifier U2. The inverting input terminal of the operational amplifier U2 is connected to the output terminal of the operational amplifier U2. One end of the resistor R2 is connected to the output terminal of the operational amplifier U2, and the other end of the resistor R2 is connected to the positive terminal of the fiber laser diode (14).

10. The fiber optic probe for measuring high voltage lightning discharge on the surface of the structural coating according to claim 2, characterized in that: The photodetector includes a resistor R4, a capacitor C2, a capacitor C3, a diode D2, and an amplifier U1; wherein, The resistor R4 is connected to the negative terminal of the diode D2. One end of the capacitor C2 is connected between the resistor R4 and the diode D2. The other end of the capacitor C2 is connected to the input terminal of the amplifier U1. The output terminal of the amplifier U1 is connected to the capacitor C3.

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