Metal coating detection device and metal coating detection method

Abstract

The embodiment of the invention discloses a metal coating detection device and a metal coating detection method. A transmitting antenna and a receiving antenna are in communication connection with a signal analysis module. Therefore, on one hand, the transmitting antenna and the receiving antenna are configured as horn antennas, so that the directivity of electromagnetic waves and the gain in a specific direction are improved. And on the other hand, the central axes of the two horn antennas are arranged in the same plane, and the two large-diameter openings are close to each other at the same angle, so that when the to-be-measured area is placed between the two large-diameter openings and the incident electromagnetic waves with the preset frequency are radiated to the to-be-measured area, the reflection condition of the electromagnetic waves can be met. And the signal analysis module analyzes the signal intensity of the reflected electromagnetic wave to conveniently judge whether the metal coating is arranged in the to-be-detected area. The detection accuracy is improved, and the situation that the metal coating is scratched due to direct contact with the metal coating is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of product detection, and in particular to a metal coating detection device and a metal coating detection method. Background Art

[0002] Setting a metal coating on the non-metal shell of the product can make the surface of the product harder and smoother, and by adjusting the color of the metal coating, the product can be more beautiful. At the same time, the non-metal shell can also reduce weight.

[0003] For 3C electronics, antennas are installed inside the device to communicate with external devices. In order to avoid the coupling between the metal coating and the antenna, which would result in a decrease in the radiation performance of the antenna, the metal coating needs to be installed on the non-metallic shell to avoid the antenna. How to easily detect whether a specific area of ​​the non-metallic shell is equipped with a metal coating has become a problem that needs to be solved. Summary of the invention

[0004] In view of this, the embodiments of the present invention provide a metal coating detection device and a metal coating detection method, wherein the transmitting antenna and the receiving antenna are configured as horn antennas and are arranged on the same plane as the area to be tested, and the large-diameter opening is arranged toward the area to be tested. Thus, the signal strength of the reflected electromagnetic wave received by the receiving antenna is used to determine whether the area to be tested is provided with a metal coating.

[0005] According to a first aspect of an embodiment of the present invention, a metal coating detection device is provided, the metal coating detection device comprising:

[0006] The transmitting antenna and the receiving antenna are both horn antennas, the transmitting antenna and the receiving antenna are arranged at an interval, the horn antenna has a large diameter opening and a small diameter opening, the central axes of the two horn antennas are in the same plane, and the two large diameter openings face the same side and are inclined to the opposite side by the same amplitude; and

[0007] A signal analysis module is communicatively connected to the transmitting antenna and the receiving antenna. The signal analysis module is configured to transmit an incident electromagnetic wave of a predetermined frequency to the area to be measured through the transmitting antenna, and to receive a reflected electromagnetic wave from the area to be measured through the receiving antenna to display the signal strength of the reflected electromagnetic wave.

[0008] Further, the horn antenna is a conical horn antenna and comprises a plurality of connecting sections in the axial direction, wherein the connecting sections have a large-mouth end and a small-mouth end facing opposite directions;

[0009] The plurality of connecting segments are detachably connected, and two adjacent connecting segments are butted against each other through the large-mouth end and the small-mouth end.

[0010] Further, the plurality of connecting segments include a first connecting segment, a second connecting segment and a third connecting segment, and the second connecting segment is connected between the first connecting segment and the third connecting segment;

[0011] The large-mouth end of the first connecting segment forms the large-diameter opening and has a diameter of 22 mm, the large-mouth end of the second connecting segment has a diameter of 20 mm, and the large-mouth end of the third connecting segment has a diameter of 14.9 mm.

[0012] Further, the conical horn antenna has a first working state, a second working state and a third working state;

[0013] In the first working state, the first connecting section, the second connecting section and the third connecting section are spliced ​​together, and the working frequency band of the conical horn antenna is configured to be 87 GHz-100 GHz;

[0014] In the second working state, the second connecting section is configured to be spliced ​​with the third connecting section and the large-mouth end forms the large-diameter mouth, and the working frequency band of the conical horn antenna is configured to be 100 GHz-112 GHz;

[0015] In the third working state, the third connecting section is configured so that the large-mouth end forms the large-diameter mouth, and the working frequency band of the conical horn antenna is configured to be 115 GHz-140 GHz.

[0016] Furthermore, the plurality of connecting sections are threadedly connected.

[0017] Furthermore, the included angle between the central axes of the two horn antennas is 90 degrees.

[0018] Furthermore, the two horn antennas are configured such that the center distance between the two large-diameter openings is L3, wherein: 15cm≤D≤22cm.

[0019] In a second aspect, an embodiment of the present invention further provides a metal coating detection method, the metal coating detection method comprising:

[0020] The central axes of the transmitting antenna and the receiving antenna are arranged in the same plane, and the two large-diameter openings are oriented toward the same side and tilted toward the opposite side by the same amplitude, wherein the transmitting antenna and the receiving antenna are both horn antennas;

[0021] Direct the area to be measured toward the large-diameter openings of the transmitting antenna and the receiving antenna, and keep a predetermined distance between the area to be measured and the two large-diameter openings;

[0022] Transmitting an incident electromagnetic wave of a predetermined frequency to the area to be measured through the transmitting antenna, and receiving a reflected electromagnetic wave from the area to be measured through the receiving antenna;

[0023] The signal strength of the reflected electromagnetic wave is displayed.

[0024] Further, transmitting the incident electromagnetic wave of a predetermined frequency to the area to be measured by the transmitting antenna, and receiving the reflected electromagnetic wave of the area to be measured by the receiving antenna, specifically includes:

[0025] The first incident electromagnetic wave is transmitted to the area to be measured through the transmitting antenna, and the first reflected electromagnetic wave of the area to be measured is received through the receiving antenna, wherein the horn antenna includes a first connecting section and a second connecting section that are detachably connected in the axial direction, and the large-diameter opening is formed in the first connecting section;

[0026] In response to the signal strength of the first reflected electromagnetic wave being less than a first predetermined value;

[0027] disassembling the first connecting section;

[0028] A second incident electromagnetic wave is emitted to the area to be measured through the transmitting antenna, and a second reflected electromagnetic wave of the area to be measured is received through the receiving antenna, wherein the large-mouth end of the second connecting section forms the large-diameter mouth, and the frequency of the first incident electromagnetic wave is less than the frequency of the second incident electromagnetic wave.

[0029] Further, the transmitting antenna transmits a second incident electromagnetic wave to the area to be measured, and the receiving antenna receives a second reflected electromagnetic wave from the area to be measured, and then includes:

[0030] In response to the signal strength of the second reflected electromagnetic wave being less than a second predetermined value;

[0031] Disassembling the second connecting section, wherein the horn antenna further comprises a third connecting section detachably connected to the small-diameter opening of the second connecting section in the axial direction, and the large-diameter opening is formed in the third connecting section;

[0032] A third incident electromagnetic wave is transmitted to the area to be measured through the transmitting antenna, and a third reflected electromagnetic wave of the area to be measured is received through the receiving antenna, wherein a frequency of the second incident electromagnetic wave is less than a frequency of the third incident electromagnetic wave.

[0033] Further, the disassembling the first connecting section specifically includes:

[0034] The first connecting section is removed from the second connecting section, and the distance between the large end of the second connecting section and the area to be tested is adjusted to a second distance, wherein the distance between the large end of the first connecting section and the area to be tested is a first distance, and the first distance is greater than the second distance.

[0035] Further, the disassembling the second connecting section specifically includes:

[0036] The second connecting section is removed from the third connecting section, and the distance between the large end of the third connecting section and the area to be tested is adjusted to a third distance, wherein the distance between the large end of the second connecting section and the area to be tested is a second distance, and the second distance is greater than the third distance.

[0037] The metal coating detection device and the metal coating detection method of the embodiment of the present invention connect the transmitting antenna and the receiving antenna to the signal analysis module, and the signal analysis module is configured to radiate electromagnetic waves to the area to be tested through the transmitting antenna, and receive the electromagnetic waves reflected by the area to be tested through the receiving antenna. Thus, on the one hand, the transmitting antenna and the receiving antenna are configured as horn antennas, thereby improving the directivity of the electromagnetic waves and the gain in a specific direction. On the other hand, the central axes of the two horn antennas are set in the same plane, and the two large-diameter openings are close to each other at the same angle. When the area to be tested is placed between the two large-diameter openings and the incident electromagnetic wave of a predetermined frequency is radiated to the area to be tested, the reflection condition of the electromagnetic wave can be met. The signal analysis module analyzes the signal strength of the reflected electromagnetic wave to facilitate the determination of whether the metal coating is laid in the area to be tested. The accuracy of the detection is improved, and direct contact with the metal coating is avoided, resulting in scratches. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0039] Figure 1 is a schematic diagram of the structure of a qualified workpiece according to an embodiment of the present invention;

[0040] Figure 2 is a schematic structural diagram of an unqualified workpiece according to an embodiment of the present invention;

[0041] Figure 3 is a schematic structural diagram of a metal coating detection device according to an embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of the positional relationship between the transmitting antenna and the receiving antenna of the embodiment of the present invention and the area to be measured in some implementation modes;

[0043] Figure 5is a schematic diagram of the positional relationship between the transmitting antenna and the receiving antenna of the embodiment of the present invention and the area to be measured in other implementation modes;

[0044] Figure 6 is a schematic structural diagram of a transmitting antenna according to an embodiment of the present invention;

[0045] Figure 7 is an exploded schematic diagram of a transmitting antenna according to an embodiment of the present invention;

[0046] Figure 8 1 is a schematic diagram of a process of a metal coating detection method according to an embodiment of the present invention;

[0047] Fig. 9 4 is a simulation schematic diagram of the radiation gain of an embodiment of the present invention.

[0048] Description of reference numerals:

[0049] 1- Transmitting antenna;

[0050] 11-large diameter opening; 12-small diameter opening; 13-connecting section; 131-large opening end; 132-small opening end;

[0051] 2- Receiving antenna;

[0052] 21-first connecting section; 22-second connecting section; 23-third connecting section;

[0053] 3-Signal analysis module;

[0054] 4-Mounting frame;

[0055] 5-coaxial line;

[0056] A-workpiece; A1-area to be tested; A2-metal coating. DETAILED DESCRIPTION

[0057] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the detailed description of the present invention below, some specific details are described in detail. It is possible for a person skilled in the art to fully understand the present invention without the description of these details. In order to avoid confusing the essence of the present invention, known methods, processes, flows, components and circuits are not described in detail.

[0058] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0059] Unless the context clearly requires otherwise, the words "include", "comprising" and similar words throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, the meaning is "including but not limited to".

[0060] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0061] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] For ease of explanation, spatially relative terms such as "inside", "outside", "below", "below", "lower", "above", "upper", etc. are used herein to describe the relationship of one element or feature illustrated in the figures to another element or feature. It will be understood that spatially relative terms may be intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figure is turned over, an element described as being "below" or "below" other elements or features will then be positioned as being "above" the other elements or features. Thus, the example term "below" can include both the orientations of above and below. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0063] Figure 1 It is a schematic diagram of the structure of the qualified workpiece A of this embodiment. The workpiece A in the figure is a shell, which can be applied to electronic devices such as watches, mobile phones or headphones to protect the electronic devices. The area shown by the section line in the figure is the metal coating A2 arranged on the workpiece A. When the shell is assembled on the electronic device, the shell cover is arranged on the outside of the antenna, and the area where the metal coating A2 is not arranged (that is, the area to be tested A1) will be arranged corresponding to the antenna of the electronic device (such as a Bluetooth antenna or a WIFI antenna, etc.). The workpiece A in this embodiment has two areas A1 to be tested.

[0064] Specifically, the workpiece A in this embodiment includes a substrate and a metal coating A2 disposed on the surface of the substrate. The substrate is configured to be made of non-metal (such as plastic, rubber or plastic, etc.), thereby reducing the overall weight of the electronic device. At the same time, the disposed metal coating A2 can increase the structural strength of the shell and make the electronic device more beautiful. The metal coating A2 can be made on the substrate using a PVD process (physical vapor deposition).

[0065] Figure 2 Schematic diagram of the structure of the unqualified workpiece A in this embodiment.

[0066] It is easy to understand that when the metal coating A2 is set corresponding to the antenna, it may couple with the antenna, making it difficult for the antenna's electromagnetic waves to effectively radiate to the outside of the electronic device, directly affecting the antenna's radiation efficiency. For this reason, a avoidance area is set on the metal coating A2 so that the metal coating A2 can avoid the antenna and prevent the metal coating A2 from affecting the antenna performance. However, during the manufacturing of workpiece A, if there is a problem in the process, resulting in the metal coating A2 being arranged in the avoidance area (such as Figure 2 Continuing to assemble workpiece A will result in defective electronic equipment.

[0067] To this end, workpiece A needs to be inspected in advance before workpiece A is assembled, but the thickness of metal coating A2 is relatively thin, and when the color of metal coating A2 is close to that of the substrate, it is difficult to identify by appearance. In addition, when using a multimeter to test the voltage of the avoidance area, the probe will directly contact the metal coating A2, causing the metal coating A2 to be scratched, affecting the aesthetics of the electronic device. At the same time, the detection efficiency of the above detection method is low.

[0068] Figure 3 Schematic diagram of the structure of the metal coating detection device of this embodiment.

[0069] In some embodiments, Figure 1 As shown, the metal coating detection device in this embodiment includes a transmitting antenna 1, a receiving antenna 2, a signal analysis module 3 and two coaxial lines 5. The transmitting antenna 1 and the receiving antenna 2 are communicatively connected to the signal analysis module 3 through the two coaxial lines 5 respectively.

[0070] Optionally, the metal coating detection device further includes a mounting frame 4, and the transmitting antenna 1 and the receiving antenna 2 are spaced apart on the mounting frame 4. The mounting frame 4 is used to fix the transmitting antenna 1 and the receiving antenna 2 so that the operator can move the workpiece A. At the same time, the transmitting antenna 1 and the receiving antenna 2 are both configured as horn antennas.

[0071] Figure 4 and Figure 5 It is a schematic diagram of the positional relationship between the transmitting antenna 1 and the receiving antenna 2 and the area to be measured A1 of this embodiment. Figure 4 The dotted line III in is the normal line of the surface where the area A1 to be tested is located.

[0072] In some embodiments, Figure 4-Figure 5 As shown, the horn antenna in this embodiment has a large diameter opening 11 and a small diameter opening 12, and the central axes of the two horn antennas are in the same plane (such as Figure 4At the same time, the two large-diameter openings 11 face the same side and are inclined to the opposite side by the same amount, that is, the angle a1 between the dotted line I and the normal line is equal to the angle a2 between the dotted line II and the normal line.

[0073] The signal analysis module 3 is configured to transmit an incident electromagnetic wave of a predetermined frequency to the area to be measured A1 through the transmitting antenna 1, that is, the large-diameter opening 11 of the transmitting antenna 1 faces the area to be measured A1, and radiates electromagnetic waves to the area to be measured A1. At the same time, the signal analysis module 3 receives the reflected electromagnetic wave of the area to be measured A1 through the receiving antenna 2 to display the signal strength of the reflected electromagnetic wave.

[0074] Specifically, the signal analysis module 3 includes an electromagnetic signal generating unit, an electromagnetic signal receiving unit, a parsing unit and a display unit. The electromagnetic signal generating unit is used to generate an electromagnetic signal of a predetermined frequency corresponding to the current horn antenna, the electromagnetic signal receiving unit is used to receive the electromagnetic signal reflected by the test area A1, the parsing unit is used to parse the reflected electromagnetic signal, and display the intensity of the currently received electromagnetic signal through the display unit. This allows the operator to determine whether the metal plating A2 exists in the test area A1.

[0075] When the area to be tested A1 is not provided with the metal coating A2, most of the incident electromagnetic waves will pass through the area to be tested A1, so that the intensity of the electromagnetic signal received by the receiving antenna 2 is relatively low. When the area to be tested A1 is provided with the metal coating A2, the incident electromagnetic wave passes through the metal coating A2 of the area to be tested A1, and the generated reflected electromagnetic wave is relatively strong. By comparison, the operator can determine whether the area to be tested A1 is provided with the metal coating A2.

[0076] In summary, the metal coating detection device of this embodiment connects the transmitting antenna 1 and the receiving antenna 2 to the signal analysis module 3, and the signal analysis module 3 is configured to radiate electromagnetic waves to the area to be tested A1 through the transmitting antenna 1, and receive the electromagnetic waves reflected by the area to be tested A1 through the receiving antenna 2. Therefore, on the one hand, the transmitting antenna 1 and the receiving antenna 2 are configured as horn antennas, thereby improving the directivity of the electromagnetic waves and the gain in a specific direction. On the other hand, the central axes of the two horn antennas are set in the same plane, and the two large-diameter openings 11 are close to each other at the same angle. When the area to be tested A1 is placed between the two large-diameter openings 11 and the incident electromagnetic wave of a predetermined frequency is radiated to the area to be tested A1, the reflection condition of the electromagnetic wave can be met. The signal analysis module 3 analyzes the signal strength of the reflected electromagnetic wave to facilitate the determination of whether the metal coating A2 is laid in the area to be tested A1. The accuracy of the detection is improved, and direct contact with the metal coating A2 is avoided, resulting in scratches.

[0077] Furthermore, the angle between the central axes of the two horn antennas is 90 degrees (angle a1 and angle a2 are both 45 degrees). That is, the transmitting antenna 1 rotates 45 degrees counterclockwise relative to the normal line of the area to be measured A1, and the receiving antenna 2 rotates 45 degrees clockwise relative to the normal line of the area to be measured A1. As a result, the metal coating detection device has better reflection conditions.

[0078] Optionally, the horn antenna may be a prismatic horn antenna (i.e., a rectangular axial section) or a conical horn antenna (a circular axial section). Those skilled in the art may select the horn antenna according to the shape of the area to be measured A1, so that the waveform of the horn antenna can match the shape of the area to be measured A1.

[0079] Figure 6 Schematic diagram of the structure of the transmitting antenna 1 of this embodiment. Figure 7 Schematic diagram of an explosion of the transmitting antenna 1 of this embodiment.

[0080] In some embodiments, Figure 4 As shown, the horn antenna is a conical horn antenna, that is, both the transmitting antenna 1 and the receiving antenna 2 are conical horn antennas. At the same time, the conical horn antenna includes a plurality of connecting sections 13 in the axial direction.

[0081] Further reference Figure 6-Figure 7 As shown, the connecting section 13 has a large end 131 and a small end 132 facing oppositely. A plurality of connecting sections 13 are detachably connected, and two adjacent connecting sections 13 are butted together through the large end 131 and the small end 132.

[0082] This embodiment uses a conical horn antenna, which can facilitate the disassembly of the connecting section 13. By changing the diameter of the large-diameter opening 11, the signal analysis module 3 is used to radiate incident electromagnetic waves of different frequencies to the test area A1. Therefore, on the one hand, the metal plating detection device can adapt to the test area A1 of different sizes, while improving the detection accuracy of the test area A1. On the other hand, the cross-section of the lobe of the conical horn antenna in the radiation direction is circular (such as Figure 2 As shown by the dotted lines IV and V in the figure, when the operator moves the workpiece A (as shown in Figure 2 As shown by the arrow in the figure, the corresponding position of the transmitting antenna 1 and the area to be measured A1 can be easily evaluated to prevent the electromagnetic wave from covering the metal coating A2 outside the area to be measured A1, thereby affecting the detection accuracy.

[0083] Preferably, the plurality of connection segments 13 are threadedly connected. For example, a female thread is provided at the large end 131 and a male thread is provided at the corresponding small end 132, thereby simplifying the disassembly operation of the connection segment 13.

[0084] In some embodiments, Figure 4-Figure 5As shown, the plurality of connecting segments 13 include a first connecting segment 21, a second connecting segment 22 and a third connecting segment 23, and the second connecting segment 22 is connected between the first connecting segment 21 and the third connecting segment 23. The large-mouth end 131 of the first connecting segment 21 forms a large-diameter opening 11 and is configured with a diameter of 22 mm, the large-mouth end 131 of the second connecting segment 22 is configured with a diameter of 20 mm, and the large-mouth end 131 of the third connecting segment 23 is configured with a diameter of 14.9 mm.

[0085] Table 1

[0086] Working status Diameter of large diameter port (mm) Operating frequency band (GHz) Distance from the area to be measured (cm) The third working state 14.9 115-140 15 Second working state 19.7 100-112 20 First working state 22 87-100 22

[0087] As shown in Table 1, the conical horn antenna in this embodiment has a first working state, a second working state and a third working state. Those skilled in the art can adjust the shape of the conical horn antenna according to the size of the area to be measured A1 or the requirements of the detection accuracy.

[0088] In the first working state, the first connecting section 21, the second connecting section 22 and the third connecting section 23 are connected to each other, and the diameter of the large-mouth end 131 of the first connecting section 21 is configured to be 22 mm to form a large-diameter mouth 11. At the same time, the working frequency band of the conical horn antenna is configured to be 87 GHz-100 GHz, and the corresponding contour of the lobe of the incident electromagnetic wave in the test area A1 is as follows: Figure 2 In this form, the area A1 to be measured can be measured quickly, and the operator can also move the workpiece A horizontally so that the incident electromagnetic wave can quickly scan most of the area A1 to be measured.

[0089] Figure 2 A specific form of unqualified workpiece A is shown in the figure. The metal coating A2 of the upper test area A1 in the figure is relatively large. At this time, the incident electromagnetic wave generated by the conical horn antenna in the first working state will radiate to the metal coating A2 of the test area A1, generate reflected electromagnetic waves, and be received by the receiving antenna 2. The metal coating A2 of the lower test area A1 has a smaller area, and the incident electromagnetic wave emitted by the transmitting antenna 1 in the first working state cannot cover it. In addition, in order to prevent the incident electromagnetic wave from covering the outside of the test area A1, even if the workpiece A is moved horizontally, it is difficult to cover the metal coating A2 inside the test area A1.

[0090] In the second working state, the second connecting section 22 is configured to be assembled with the third connecting section 23, and the large-mouth end 131 of the second connecting section 22 forms a large-diameter opening 11. At the same time, the working frequency band of the conical horn antenna is configured to be 100GHz-112GHz. That is, the first connecting section 21 of the transmitting antenna 1 and the receiving antenna 2 are disassembled at the same time, and the large-mouth end 131 of the second connecting section 22 is used to transmit and receive electromagnetic waves.

[0091] In this form, the projection area of ​​the lobe in the test area A1 can be reduced (the corresponding contour of the lobe of the incident electromagnetic wave in the test area A1, such as Figure 2 ), by cooperating with the operator to move the workpiece A (as shown by arrow A), the incident electromagnetic wave can cover the metal coating A2 with a smaller area.

[0092] In the third working state, the third connecting section 23 is configured as a large-mouth end 131 to form a large-diameter mouth 11, and the working frequency band of the conical horn antenna is configured to be 115GHz-140GHz. That is, the second connecting sections 22 of the transmitting antenna 1 and the receiving antenna 2 are disassembled at the same time, and the large-mouth end 131 of the second connecting section 22 is used to transmit and receive electromagnetic waves. In this form, the width of the beam of the transmitting antenna 1 can be narrower, which is helpful for detecting a smaller area of ​​the metal plating A2.

[0093] In some embodiments, Figure 4-Figure 5 As shown, the two horn antennas are configured such that the center distance between the two large-diameter openings 11 is L3. Among them, 15cm≤D≤22cm. That is, the distance L3 is configured to be 15cm to 22cm times the square root of 2. When the angle a1 and the angle a2 are both 45 degrees, the line connecting the centers of the two large-diameter openings 11 and the area to be measured A1 forms an isosceles right triangle.

[0094] Further reference is made to Table 1 and Figure 4 As shown, when the conical horn antenna is in the first working state, The area A1 to be measured is configured to be 22 cm away from the transmitting antenna 1. At this time, the large-diameter aperture 11 of the receiving antenna 2 can just correspond to the area A1 to be measured, that is, the distance L1 and the distance L2 are both 22 cm.

[0095] Further reference is made to Table 1 and Figure 5 As shown, when the conical horn antenna is in the second working state, The area A1 to be measured is configured to be 20 cm away from the transmitting antenna 1. At this time, the large-diameter aperture 11 of the receiving antenna 2 can just correspond to the area A1 to be measured, that is, the distance L1′ and the distance L2′ are both 20 cm.

[0096] When the conical horn antenna is in the third working state, The distance between the large-diameter opening 11 of the transmitting antenna 1 and the receiving antenna 2 and the test area A1 can be configured to be 15 cm. Thus, the test area A1 is always located in the far field of the conical horn antenna, thereby satisfying the far-field radiation condition and making the beam shape more regular.

[0097] Figure 8 Schematic diagram of the metal coating detection method of this embodiment.

[0098] In some embodiments, Figure 8 As shown, the metal plating detection method in this embodiment includes the following steps.

[0099] Step S100: The central axes of the transmitting antenna 1 and the receiving antenna 2 are arranged in the same plane, and the two large-diameter openings 11 are oriented toward the same side and tilted toward the opposite side by the same amplitude.

[0100] In this step, the transmitting antenna 1 and the receiving antenna 2 are both horn antennas. The use of horn antennas ensures that both the incident electromagnetic wave and the reflected electromagnetic wave have good directivity.

[0101] Step S200: The area A1 to be tested is directed toward the large-diameter openings 11 of the transmitting antenna 1 and the receiving antenna 2, and a predetermined distance is maintained between the area A1 to be tested and the two large-diameter openings 11. At this distance, the transmitting antenna 1 and the receiving antenna 2 are both in long-range radiation conditions.

[0102] Step S300 : transmitting an incident electromagnetic wave of a predetermined frequency to the area A1 to be measured through the transmitting antenna 1 , and receiving a reflected electromagnetic wave from the area A1 to be measured through the receiving antenna 2 .

[0103] In this step, when the incident electromagnetic wave radiates to the metal coating A2, it will excite the free electrons of the metal coating A2 to vibrate at the same frequency, thereby generating a reflected electromagnetic wave of the same frequency. When the incident electromagnetic wave does not radiate to the metal coating A2, but directly radiates to the substrate. At this time, the reflected electromagnetic wave generated from the substrate will be relatively small. Most of the electromagnetic waves will pass through the substrate in the form of transmitted waves.

[0104] Step S400: displaying the signal strength of the reflected electromagnetic wave.

[0105] In this step, the operator can judge by the displayed signal strength, and further judge whether the metal plating layer A2 is disposed in the test area A1.

[0106] In summary, the metal coating detection method of this embodiment configures the transmitting antenna 1 and the receiving antenna 2 as horn antennas, thereby improving the directivity of the electromagnetic wave and the gain in a specific direction. On the other hand, the central axes of the two horn antennas are set in the same plane, and the two large-diameter openings 11 are close to each other at the same angle. When the area A1 to be tested is placed between the two large-diameter openings 11 and the incident electromagnetic wave of a predetermined frequency is radiated to the area A1 to be tested, the reflection condition of the electromagnetic wave can be met. It is convenient to judge whether the metal coating A2 is laid in the area A1 to be tested by the displayed signal strength. The accuracy of the detection is improved, and direct contact with the metal coating A2 is avoided, which may cause scratches on it.

[0107] Furthermore, step S300 specifically includes:

[0108] Step S310: The first incident electromagnetic wave is transmitted to the test area A1 through the transmitting antenna 1, and the first reflected electromagnetic wave of the test area A1 is received through the receiving antenna 2. The horn antenna includes a first connecting section 21 and a second connecting section 22 that are detachably connected in the axial direction, and the large-diameter opening 11 is formed in the first connecting section 21.

[0109] Step S320: In response to the signal strength of the first reflected electromagnetic wave being less than a first predetermined value.

[0110] Fig. 9 It is a simulation diagram of the radiation gain of this embodiment. The ordinate is the forward transmission coefficient (S21), that is, the transmission efficiency of electromagnetic waves from the transmitting antenna 1 to the receiving antenna 2. The frequency range of the abscissa is 60GHz-110GHz. Curve IIa and curve IIb are the radiation gain curves of the metal coating A2 and the substrate as the reflective medium at different frequencies.

[0111] Specifically, Fig. 9 As shown, the first predetermined value in this embodiment can be configured as -8dB. When the signal strength of the first reflected electromagnetic wave is greater than or equal to -8dB, workpiece A can be directly determined to be a substandard product. When the signal strength of the first reflected electromagnetic wave is less than -8dB, further inspection is required in step S330.

[0112] Optionally, when there are multiple areas A1 to be tested, the multiple areas A1 to be tested may be tested in sequence. When any area A1 to be tested is unqualified, the workpiece A is identified as an unqualified product.

[0113] Step S330: disassembling the first connecting section 21. Thus, the conical horn antenna is switched from the first working state to the second working state.

[0114] Step S340: transmitting a second incident electromagnetic wave to the test area A1 through the transmitting antenna 1, and receiving a second reflected electromagnetic wave from the test area A1 through the receiving antenna 2. The large-mouth end 131 of the second connecting section 22 forms a large-diameter mouth 11, and the frequency of the first incident electromagnetic wave is lower than the frequency of the second incident electromagnetic wave.

[0115] Specifically, the transmitting antenna 1 in this step is in the second working state, and the frequency band of the second incident electromagnetic wave fed to the transmitting antenna 1 by the signal analysis module 3 is 100GHz-112GHz. Thus, a metal plating layer A2 of a smaller size can be detected, thereby increasing the detection accuracy of the metal plating detection device.

[0116] Alternatively, if Figure 2As shown, in this step, the workpiece A is moved horizontally so that the large-diameter opening 11 corresponds to different areas of the test area A1, so that the beam scans different positions as much as possible, thereby detecting whether the metal coating A2 is arranged at the edge of the test area A1.

[0117] Optionally, when there are multiple areas A1 to be tested, the multiple areas A1 to be tested may be tested in sequence. When any area A1 to be tested is unqualified, the workpiece A is identified as an unqualified product.

[0118] Step S350: In response to the signal strength of the second reflected electromagnetic wave being less than a second predetermined value.

[0119] Specifically, the second predetermined value in this step is configured as -15dB. When the signal strength of the second reflected electromagnetic wave is greater than or equal to -15dB, the workpiece A can be directly determined to be unqualified. When the signal strength of the second reflected electromagnetic wave is less than -15dB, further detection is performed through step S360.

[0120] Step S360: dismantle the second connecting section 22. The horn antenna further includes a third connecting section 23 detachably connected to the small-diameter opening 12 of the second connecting section 22 in the axial direction, and the large-diameter opening 11 is formed in the third connecting section 23. Thus, the conical horn antenna is switched from the second working state to the third working state.

[0121] Step S360: The third incident electromagnetic wave is transmitted to the test area A1 through the transmitting antenna 1, and the third reflected electromagnetic wave of the test area A1 is received through the receiving antenna 2. The frequency of the second incident electromagnetic wave is less than the frequency of the third incident electromagnetic wave. Thus, the detection accuracy is further improved. The frequency of the third incident electromagnetic wave matches the third working state of the conical horn antenna.

[0122] Alternatively, if Figure 2 As shown, in this step, the workpiece A is moved horizontally so that the large-diameter opening 11 corresponds to different areas of the test area A1, so that the beam scans different positions as much as possible, thereby detecting whether the metal coating A2 is arranged at the edge of the test area A1.

[0123] Optionally, when there are multiple areas A1 to be tested, the multiple areas A1 to be tested may be tested in sequence. When any area A1 to be tested is unqualified, the workpiece A is identified as an unqualified product.

[0124] Further, step S330 specifically includes: removing the first connecting section 21 from the second connecting section 22, and adjusting the distance between the large end 131 of the second connecting section 22 and the area to be tested A1 to a second distance. The distance between the large end 131 of the first connecting section 21 and the area to be tested A1 is the first distance, and the first distance is greater than the second distance.

[0125] Specifically, the first distance and the second distance are 22 cm and 20 cm respectively. Figure 6 As shown, the axial length L4 of the first connecting section 21 in this step is 7.6 cm. Therefore, in order to ensure that after the connecting section 13 is removed, the conical horn antenna is in the second working state, considering that the radiation energy decays with the distance of transmission, and the workpiece A can still be in the far-field condition, the second connecting section 22 and the third connecting section 23 are moved 9.6 cm toward the workpiece A.

[0126] Preferably, the mounting frame 4 includes two rail assemblies and two positioning parts respectively corresponding to the transmitting antenna 1 and the receiving antenna 2, and the tails of the transmitting antenna 1 and the receiving antenna 2 are mounted on the sliders of the corresponding rail assemblies, and the length direction of the rails of the rail assemblies is parallel to the central axis. Thus, the positions of the transmitting antenna 1 and the receiving antenna 2 are adjusted by the rail assemblies, and the positioning parts are used to perform positioning operations after the adjustments are made.

[0127] Further, step S360 specifically includes: removing the second connecting section 22 from the third connecting section 23, and adjusting the distance between the large end 131 of the third connecting section 23 and the area to be tested A1 to a third distance. The distance between the large end 131 of the second connecting section 22 and the area to be tested A1 is the second distance, and the second distance is greater than the third distance.

[0128] Specifically, the third distance is 15 cm, and the axial length L5 of the second connecting section 22 is 6.3 cm. Therefore, in this step, the guide rail assembly is also required to move the transmitting antenna 1 and the receiving antenna 2 to the test area A1 by another 11.3 cm, and the positioning unit is used to perform positioning operations after adjustment, so that the workpiece A can still be in the far field area.

[0129] Optionally, the operator can first detect the gains of the reflected electromagnetic waves of the metal coating A2 and the substrate at different frequencies, and form simulation curves IIa and IIb. Therefore, in the detection of the test area A1, the above two curves can be compared to improve the judgment accuracy.

[0130] Optionally, the signal analysis module 3 in this embodiment can be a network analyzer. The network analyzer has a first port and a second port, and two coaxial lines 5 are connected to the first port and the second port respectively. The metal plating detection device also includes an attenuator or a filter, and the receiving antenna 2 is connected to the second port through the attenuator or the filter. Taking the attenuator as an example, the intensity of the incident electromagnetic wave entering the second port is adjusted by the attenuator. At the same time, the network analyzer calculates the insertion loss of the attenuator through the attenuation of the attenuator, and then indirectly determines the intensity of the reflected electromagnetic wave.

[0131] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A metal coating detection device, characterized in that: The metal coating detection device comprises: The transmitting antenna (1) and the receiving antenna (2) are both horn antennas, the transmitting antenna (1) and the receiving antenna (2) are arranged at an interval, the horn antennas have a large-diameter opening (11) and a small-diameter opening (12), the central axes of the two horn antennas are in the same plane, and the two large-diameter openings (11) face the same side and are inclined to opposite sides by the same amplitude; and A signal analysis module (3) is communicatively connected to the transmitting antenna (1) and the receiving antenna (2), and the signal analysis module (3) is configured to transmit incident electromagnetic waves of a predetermined frequency to the area to be measured (A1) through the transmitting antenna (1), and to receive reflected electromagnetic waves from the area to be measured (A1) through the receiving antenna (2), so as to display the signal strength of the reflected electromagnetic waves.

2. The metal coating detection device according to claim 1, characterized in that: The horn antenna is a conical horn antenna and comprises a plurality of connecting sections (13) in the axial direction, wherein the connecting sections (13) have a large-mouth end (131) and a small-mouth end (132) facing opposite directions; The plurality of connecting segments (13) are detachably connected, and two adjacent connecting segments (13) are butt-jointed via the large-mouth end (131) and the small-mouth end (132).

3. The metal coating detection device according to claim 2, characterized in that: The plurality of connecting segments (13) include a first connecting segment (21), a second connecting segment (22) and a third connecting segment (23), wherein the second connecting segment (22) is connected between the first connecting segment (21) and the third connecting segment (23); The large-mouth end (131) of the first connecting section (21) forms the large-diameter opening (11) and has a diameter configured to be 22 mm, the large-mouth end (131) of the second connecting section (22) has a diameter configured to be 20 mm, and the large-mouth end (131) of the third connecting section (23) has a diameter configured to be 14.9 mm.

4. The metal coating detection device according to claim 3, characterized in that: The conical horn antenna has a first working state, a second working state and a third working state; In the first working state, the first connecting section (21), the second connecting section (22) and the third connecting section (23) are spliced ​​together, and the working frequency band of the conical horn antenna is configured to be 87 GHz-100 GHz; In the second working state, the second connecting section (22) is configured to be joined with the third connecting section (23) and the large-mouth end (131) forms the large-diameter mouth (11), and the working frequency band of the conical horn antenna is configured to be 100 GHz-112 GHz; In the third working state, the third connecting section (23) is configured so that the large-mouth end (131) forms the large-diameter mouth (11), and the working frequency band of the conical horn antenna is configured to be 115 GHz-140 GHz.

5. The metal coating detection device according to claim 2, characterized in that: A plurality of connecting sections (13) are threadedly connected.

6. The metal coating detection device according to any one of claims 1 to 5, characterized in that: The included angle between the central axes of the two horn antennas is 90 degrees.

7. The metal coating detection device according to any one of claims 1 to 5, characterized in that: The two horn antennas are configured such that the center distance between the two large-diameter openings (11) is L3, wherein L3=D×√2, 15cm≤D≤22cm.

8. A metal coating detection method, characterized in that: The metal coating detection method comprises: The central axes of the transmitting antenna (1) and the receiving antenna (2) are arranged in the same plane, and the two large-diameter openings (11) are oriented toward the same side and tilted toward opposite sides by the same amplitude, wherein the transmitting antenna (1) and the receiving antenna (2) are both horn antennas; The area to be measured (A1) is directed toward the large-diameter openings (11) of the transmitting antenna (1) and the receiving antenna (2), and a predetermined distance is maintained between the area to be measured (A1) and the two large-diameter openings (11); Transmitting incident electromagnetic waves of a predetermined frequency to the area to be measured (A1) through the transmitting antenna (1), and receiving reflected electromagnetic waves from the area to be measured (A1) through the receiving antenna (2); The signal strength of the reflected electromagnetic wave is displayed.

9. The metal coating detection method according to claim 8, characterized in that: The method of transmitting an incident electromagnetic wave of a predetermined frequency to the area to be measured (A1) through the transmitting antenna (1) and receiving a reflected electromagnetic wave from the area to be measured (A1) through the receiving antenna (2) specifically comprises: A first incident electromagnetic wave is emitted to the area to be measured (A1) through the transmitting antenna (1), and a first reflected electromagnetic wave of the area to be measured (A1) is received through the receiving antenna (2), wherein the horn antenna comprises a first connecting section (21) and a second connecting section (22) which are detachably connected in the axial direction, and the large-diameter opening (11) is formed in the first connecting section (21); In response to the signal strength of the first reflected electromagnetic wave being less than a first predetermined value; Disassembling the first connecting section (21); A second incident electromagnetic wave is emitted to the area to be measured (A1) via the transmitting antenna (1), and a second reflected electromagnetic wave of the area to be measured (A1) is received via the receiving antenna (2), wherein the large-mouth end (131) of the second connecting section (22) forms the large-diameter mouth (11), and the frequency of the first incident electromagnetic wave is less than the frequency of the second incident electromagnetic wave.

10. The metal coating detection method according to claim 9, characterized in that: The method comprises transmitting a second incident electromagnetic wave to the area to be measured (A1) through the transmitting antenna (1), and receiving a second reflected electromagnetic wave from the area to be measured (A1) through the receiving antenna (2), and then comprising: In response to the signal strength of the second reflected electromagnetic wave being less than a second predetermined value; The second connecting section (22) is disassembled, wherein the horn antenna further comprises a third connecting section (23) detachably connected to the small-diameter opening (12) of the second connecting section (22) in the axial direction, and the large-diameter opening (11) is formed in the third connecting section (23); A third incident electromagnetic wave is emitted to the area to be measured (A1) through the transmitting antenna (1), and a third reflected electromagnetic wave of the area to be measured (A1) is received through the receiving antenna (2), wherein the frequency of the second incident electromagnetic wave is less than the frequency of the third incident electromagnetic wave.

11. The metal coating detection method according to claim 9, characterized in that: The disassembling of the first connecting section (21) specifically comprises: The first connecting section (21) is disassembled from the second connecting section (22), and the distance between the large-mouthed end (131) of the second connecting section (22) and the area to be tested (A1) is adjusted to a second distance, wherein the distance between the large-mouthed end (131) of the first connecting section (21) and the area to be tested (A1) is a first distance, and the first distance is greater than the second distance.

12. The metal coating detection method according to claim 10, characterized in that: The disassembling of the second connecting section (22) specifically comprises: The second connecting section (22) is disassembled from the third connecting section (23), and the distance between the large-mouthed end (131) of the third connecting section (23) and the area to be tested (A1) is adjusted to a third distance, wherein the distance between the large-mouthed end (131) of the second connecting section (22) and the area to be tested (A1) is a second distance, and the second distance is greater than the third distance.

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