Independent polycrystal composite sensor for PIND detection equipment

Abstract

The utility model belongs to the technical field of PIND detection, and particularly relates to an independent polycrystal composite sensor for PIND detection equipment. According to the utility model, the independent polycrystal design is adopted, the sensor main body comprises the working table, the lower surface of the working table is provided with the plurality of sensor grooves, each sensor groove is internally provided with the acoustic emission sensor unit, and the plurality of acoustic emission sensor units are independently connected in parallel, so that mutual interference of signals can be avoided, and the probability of missed detection is reduced; and the detection accuracy and efficiency are improved. In addition, due to the optimized sensor layout, four or eight acoustic emission sensor units can be arranged according to actual needs, and the acoustic emission sensor units are distributed on the working table in an annular array mode with the center groove as the circle center, so that the sensors are distributed more evenly, the detection area can be covered more comprehensively, and the detection effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of PIND detection, and in particular relates to an independent multi-crystal composite sensor for PIND detection equipment. Background Art

[0002] Particle Impact Noise Detection (PIND) is an effective method for detecting unwanted objects. Its working principle is to use a vibration table to generate a series of specific mechanical shocks and vibrations to loosen the bound particles (i.e., unwanted objects) in the package. Vibration at a certain frequency causes these loose particles to move within the system.

[0003] During the movement of particles, they slide and collide with the product shell, forming a random combination process. In this process, stress elastic waves and sound waves are generated. The two waves propagate in the product shell and form a reverberation signal, which is defined as a displacement signal. After the piezoelectric acoustic wave sensor picks up the displacement signal, it is amplified by the preamplifier and collected, processed and displayed by the host of the detection device. The detection personnel can judge the nature of the signal based on the displayed signal waveform and draw a detection conclusion.

[0004] The PIND test is used for the detection of electronic components after packaging to find free particles in the device packaging cavity. It is a non-destructive testing method, and its ultimate goal is to improve the reliability of components. The PIND detection equipment used in this method usually consists of three parts: a vibration table, a sensor, and an automatic detection system. Among them, the sensor includes an accelerometer and an acoustic emission sensor. The accelerometer is used to detect the linear vibration of the vibration table armature along the vertical axis, and the acoustic emission sensor is used to detect the acoustic emission stress wave generated by the collision of excess particles with the wall of the device to be tested. To facilitate the test, the acoustic emission sensor, the acceleration sensor and the device to be tested are generally pasted on the sensor fixture, and then the sensor fixture is fixed to the top surface of the vibration table armature with threads.

[0005] The technology currently used in PIND detection equipment is a multi-crystal non-independent method. The number of sensor units used for sensing is increased from the conventional central one to multiple ones, and they are evenly distributed on the work surface. The multiple sensor units are connected in series. This method will cause signal interference and a high probability of missed detection. Utility Model Content

[0006] In order to solve the defects of the above-mentioned prior art, the utility model proposes an independent multi-crystal composite sensor for PIND detection equipment.

[0007] The technical solution adopted by the utility model is as follows:

[0008] An independent multi-crystal composite sensor for PIND detection equipment, comprising:

[0009] A sensor body, a flexible circuit board and a terminal fixing seat, one end of the flexible circuit board is fastened to the sensor body, and the other end of the flexible circuit board is welded to the terminal fixing seat; the sensor body includes a work surface, and a plurality of sensor slots are arranged on the lower surface of the work surface, the sensor slots include a central slot arranged in the middle of the work surface, and a plurality of peripheral slots arranged in a circular array outside the central slot, acoustic emission sensor units are arranged in the central slot and the peripheral slots, and the plurality of acoustic emission sensor units are independently connected in parallel, and each acoustic emission sensor unit transmits a test signal to a host through a wire.

[0010] In a preferred embodiment, the number of the peripheral grooves is set to four, and the four peripheral grooves are arranged on the work surface in a circular array with the central groove as the center.

[0011] In a preferred embodiment, the number of the peripheral grooves is set to eight, and the eight peripheral grooves are arranged on the work surface in a circular array with the central groove as the center.

[0012] In a preferred embodiment, the acoustic emission sensor unit is an acoustic emission sensor, and the acoustic emission sensor is connected to a flexible printed circuit board via a wire.

[0013] In a preferred embodiment, the acoustic emission sensor is bonded in the sensor slot by conductive adhesive.

[0014] In a preferred embodiment, a support column is connected to the lower surface of the work surface, a base is connected below the support column, the support column and the work surface are integrally manufactured, and an annular mounting groove is provided on the base, so that the support column is fixedly installed in the mounting groove by conductive glue.

[0015] In a preferred embodiment, the support column is hollow, and the hollow portion of the support column corresponds to the central groove, and an acceleration sensor is installed in the middle of the base.

[0016] In a preferred embodiment, the work surface is made of aluminum structural parts, and the base is made of stainless steel structural parts.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] 1. Independent multi-crystal design: The sensor body in the utility model includes a work surface, and a plurality of sensor slots are arranged on the lower surface of the work surface. An acoustic emission sensor unit is arranged in each sensor slot. Multiple acoustic emission sensor units are connected in parallel and independently, which can avoid mutual interference of signals, reduce the probability of missed detection, and improve the accuracy and efficiency of detection.

[0019] 2. Optimized sensor layout: The acoustic emission sensor units in the utility model can be set to four or eight according to actual needs, and arranged on the work surface in a circular array with the central groove as the center. Such a layout makes the distribution of sensors more uniform, can cover the detection area more comprehensively, and improve the detection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0021] Figure 1 It is a three-dimensional diagram of the independent multi-crystal composite sensor in the utility model;

[0022] Figure 2 It is a schematic diagram of the structure of the independent multi-crystal composite sensor in the utility model;

[0023] Figure 3 This is a schematic diagram of the layout of the sensor slot in one embodiment of the utility model;

[0024] Figure 4 FIG. 1 is a schematic diagram of the layout of the sensor slot in another embodiment of the present invention. DETAILED DESCRIPTION

[0025] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0026] This embodiment provides an independent multi-crystal composite sensor for a PIND detection device, such as Figure 1 , 2 As shown, the structure includes a sensor body 1, a flexible circuit board 2 and a terminal fixing seat 3.

[0027] Sensor body 1: The sensor body 1 is the core part of the whole device, on which a plurality of acoustic emission sensor units 7 are mounted. The specific design is as follows:

[0028] The work surface 4 is located at the center of the sensor body 1 and is the mounting base of the acoustic emission sensor unit 7 .

[0029] Sensor slots: The lower surface of the work surface is provided with a plurality of sensor slots, which are divided into a central slot 5 and a peripheral slot 6. The central slot 5 is located in the middle of the work surface, and the peripheral slots 6 are distributed in a circular array around the central slot 5. An acoustic emission sensor unit 7 is installed in each slot.

[0030] Acoustic emission sensor unit 7: An acoustic emission sensor unit 7 is installed in each sensor slot, and these units are connected in parallel to ensure the independence of each unit.

[0031] The acoustic emission sensor unit 7 in the central groove 5 is installed in the middle of the work surface and is mainly used to detect the vibration signal at the central position.

[0032] The acoustic emission sensor units 7 in the peripheral grooves 6 surround the central groove 5 and are evenly distributed around the work surface to expand the detection range and improve the detection sensitivity.

[0033] Flexible circuit board 2: One end of the flexible circuit board 2 is fixed on the sensor body 1, and the other end is welded on the terminal fixing seat 3. Its main function is to transmit the signal of the acoustic emission sensor unit 7:

[0034] Fastening design: ensures that the circuit board is firmly installed on the sensor body 1 to avoid damage caused by external forces.

[0035] Signal transmission: The detection signal of each acoustic emission sensor unit 7 is transmitted to the terminal fixing seat 3, and finally transmitted to the host.

[0036] Binding post holder 3: Binding post holder 3 is a transfer station for signal transmission, and its design is as follows:

[0037] Welding connection: The flexible circuit board 2 is connected to the terminal fixing seat 3 by welding to ensure stable signal transmission.

[0038] Signal transfer: Receives signals from the flexible circuit board 2 and transmits the signals to the host through the wire 8 for analysis and processing.

[0039] How to use: When using, install the independent multi-crystal composite sensor on the PIND detection equipment. The specific steps are as follows:

[0040] Install the sensor: Install the sensor body 1 firmly on the PIND detection device.

[0041] Connecting wires: Connect the terminal fixing seat 3 to the host through the wire 8 to ensure that the signal can be transmitted to the host.

[0042] Signal detection: Start the detection device, each acoustic emission sensor unit 7 works independently, and any unit detects a vibration signal that is transmitted to the host through the wire 8.

[0043] Signal processing: The host receives and processes the signals of each acoustic emission sensor unit 7, performs comprehensive analysis, and determines whether there are internal particles or debris.

[0044] The utility model has the following advantages by changing the traditional single central sensor design into an independent parallel structure of multiple acoustic emission sensor units 7:

[0045] Multi-point detection: Multiple acoustic emission sensor units 7 are evenly distributed on the work surface 4 to achieve multi-point detection and improve the detection coverage.

[0046] Independent operation: Each acoustic emission sensor unit 7 is independently connected in parallel to avoid mutual interference between signals. Any unit can detect a signal and transmit it to the host.

[0047] High sensitivity: Through the parallel design of multiple acoustic emission sensor units 7, the overall detection sensitivity is improved and the probability of missed detection is reduced.

[0048] Applicable to multi-chip detection: Especially suitable for detecting multiple chips at the same time to improve detection efficiency and accuracy.

[0049] In summary, the application of the independent multi-crystal composite sensor provided in this embodiment in the PIND detection equipment effectively improves the accuracy and efficiency of detection and provides a strong guarantee for the quality control of high-reliability products.

[0050] In a preferred embodiment, see Figure 3 The number of the peripheral grooves 6 is set to four, and the four peripheral grooves 6 are arranged on the work surface in a circular array with the central groove 5 as the center.

[0051] In a preferred embodiment, see Figure 4 The number of the peripheral grooves 6 is set to eight, and the eight peripheral grooves 6 are arranged on the work surface in a circular array with the central groove 5 as the center.

[0052] Optionally, the acoustic emission sensor unit 7 is an acoustic emission sensor, the model of which is R15a. The R15a acoustic emission sensor has high sensitivity and can accurately detect tiny particle impact sounds inside the closed component. This improves the reliability and accuracy of the detection; the acoustic emission sensor is bonded to the sensor slot by conductive glue. The use of conductive glue not only ensures the stable installation of the sensor, but also effectively conducts electrical signals, ensuring the stable transmission of the acoustic emission sensor signal and reducing signal attenuation or loss caused by poor connection; it is connected to the flexible circuit board 2 by a wire 8, and the reliable connection of the wire ensures the complete transmission of the signal.

[0053] In this embodiment, the precise size design of the central groove 5 and the peripheral groove 6 (the central groove 5 has a diameter of 10 mm and a depth of 5 mm; the peripheral groove (6) has a diameter of 5 mm and a depth of 3 mm) ensures the stable installation and optimal working state of the acoustic emission sensor, thereby improving the detection sensitivity and accuracy. Through the above-mentioned optimized layout, the design of the central groove 5 and the peripheral groove 6 of different sizes enables the acoustic emission sensor unit 7 to be reasonably arranged on the work surface, which can not only concentrate on the detection center position, but also expand the detection range.

[0054] In this embodiment, the length of the flexible circuit board 2 is 100 mm and the width is 50 mm, ensuring that the signals of all acoustic emission sensor units 7 can be stably transmitted to the terminal fixing seat 3, and then transmitted to the host through the wire 8, avoiding interference and loss during signal transmission.

[0055] In this embodiment, the terminal fixing seat 3 is compactly designed (10 mm in diameter and 10 mm in height), which not only saves space but also ensures a stable connection with the flexible circuit board 2 and improves the structural stability of the overall device.

[0056] In a preferred embodiment, the lower surface of the work surface 4 is also connected to a support column 9, and the lower part of the support column 9 is connected to a base 10. The support column 9 is manufactured integrally with the work surface 4, which enhances the stability of the structure. The support column 9 is hollow, and the hollow part corresponds to the central groove, so that the signal transmission of the central sensor is smoother; the base 10 is provided with an annular mounting groove 11 with a diameter of 110mm and a depth of 10mm, so that the support column 9 is fixedly installed in the mounting groove 11 by conductive glue, ensuring structural stability and good conduction of electrical signals.

[0057] In this embodiment, the support column 9 is hollow, and the hollow portion of the support column 9 corresponds to the central groove. An acceleration sensor of model ADXL345 is installed in the middle of the base 10 for accurately detecting and analyzing vibration signals to improve detection sensitivity and accuracy.

[0058] In this embodiment, the work surface 4 is made of aluminum structural parts to ensure light weight and good thermal conductivity, thereby improving the overall performance of the equipment; the base 10 is made of stainless steel structural parts to provide strong and corrosion-resistant support.

[0059] As described above, the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An independent multi-crystal composite sensor for a PIND detection device, comprising: A sensor body (1), a flexible circuit board (2) and a terminal fixing seat (3), wherein one end of the flexible circuit board (2) is fastened to the sensor body (1), and the other end of the flexible circuit board (2) is welded to the terminal fixing seat (3); The sensor body (1) comprises a work surface (4), a plurality of sensor slots are arranged on the lower surface of the work surface (4), the sensor slots comprising a central slot (5) arranged in the middle of the work surface (4), and a plurality of peripheral slots (6) arranged in a circular array around the central slot (5), an acoustic emission sensor unit (7) is arranged in each of the central slot (5) and the peripheral slots (6), the plurality of acoustic emission sensor units (7) are independently connected in parallel, and each acoustic emission sensor unit (7) transmits a test signal to a host through a wire (8).

2. The independent multi-crystal composite sensor for PIND detection equipment according to claim 1, characterized in that: The number of the peripheral grooves (6) is set to four, and the four peripheral grooves (6) are arranged on the work surface in a circular array with the central groove (5) as the center.

3. The independent multi-crystal composite sensor for PIND detection equipment according to claim 1, characterized in that: The number of the peripheral grooves (6) is set to eight, and the eight peripheral grooves (6) are arranged on the work surface in a circular array with the central groove (5) as the center.

4. The independent multi-crystal composite sensor for PIND detection equipment according to claim 1, characterized in that: The acoustic emission sensor unit (7) is an acoustic emission sensor, and the acoustic emission sensor is connected to the flexible circuit board (2) via a wire (8).

5. The independent multi-crystal composite sensor for PIND detection equipment according to claim 4, characterized in that: The acoustic emission sensor is bonded in the sensor slot by conductive adhesive.

6. The independent multi-crystal composite sensor for PIND detection equipment according to claim 4, characterized in that: The lower surface of the work surface (4) is also connected to a support column (9), and the lower part of the support column (9) is connected to a base (10). The support column (9) and the work surface (4) are manufactured as one piece, and an annular mounting groove (11) is provided on the base (10), so that the support column (9) is fixedly mounted in the mounting groove (11) by means of conductive adhesive.

7. The independent multi-crystal composite sensor for PIND detection equipment according to claim 6, characterized in that: The support column (9) is hollow, and the hollow portion of the support column (9) corresponds to the central groove (5); an acceleration sensor is installed in the middle of the base (10).

8. The independent multi-crystal composite sensor for PIND detection equipment according to claim 7, characterized in that: The work surface (4) is made of an aluminum structural component, and the base (10) is made of a stainless steel structural component.

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