Oil abrasive particle enrichment chip based on acoustic control, LIBS (laser-induced breakdown spectroscopy) detection system and method

Abstract

The invention discloses an oil abrasive particle enrichment chip based on sound control and an LIBS (laser-induced breakdown spectroscopy) detection system and method.The enrichment chip is internally provided with an enrichment flow channel, and enrichment of oil abrasive particles is achieved through sound field driving; the detection system comprises a driving device, an enrichment chip, a detection chip, a pulse pump and an LIBS spectral analysis module, the driving device is used for sending out an electric signal with a preset frequency to excite piezoelectric ceramics to form a preset sound field in an enrichment flow channel, and oil abrasive particles are directionally gathered under the action of the sound field; the pulse pump is used for pumping the oil liquid enriched by the enrichment chip into the detection chip; the detection chip is used for carrying out secondary dispersion on the enriched oil liquid; the LIBS spectrum analysis module is used for carrying out breakdown detection on the oil liquid dispersed by the detection chip so as to obtain oil liquid spectrum data. Through a closed-loop system of sound field dynamic enrichment, pulse pump time sequence conveying and LIBS high-frequency detection, real-time continuous analysis of oil abrasive particle components is achieved, and the limitation of a traditional static sampling mode is broken through.

Description

Technical Field

[0001] The present invention relates to the fields of ultrasonic driving technology and analytical chemistry technology, and in particular to an oil wear particle enrichment chip based on acoustic manipulation, a LIBS detection system and a method. Background Art

[0002] In the operational status monitoring of mechanical equipment, the detection of wear particles in oil is a core method for assessing equipment wear and failure. Traditional oil detection technologies such as spectroscopy, ferrography, and inductance have significant limitations: Spectroscopy is limited by particle size (typically only detecting particles <10 μm), ferrography relies on manual interpretation and is highly subjective, and inductance has difficulty capturing critical submicron wear particles. Laser-induced breakdown spectroscopy (LIBS) has become an emerging method for oil wear particle detection due to its advantages of requiring no sample pretreatment, simultaneous multi-element detection, and rapid analysis. However, it still faces technical bottlenecks, primarily the following: First, wear particles in oil are sparsely distributed and have low concentrations. Traditional LIBS technology, due to insufficient plasma excitation efficiency, limits detection sensitivity; second, the complex oil matrix easily causes spectral signal distortion, affecting the accuracy of quantitative analysis; third, existing LIBS spectral analysis modules mostly use a static sampling mode and lack dynamic enrichment capabilities, making real-time monitoring under continuous operating conditions difficult. Acoustic manipulation technologies (such as ultrasonic standing waves) are based on the principle of acoustic radiation force. By adjusting the frequency, phase, and intensity of the sound waves, they can form stable acoustic pressure nodes in the fluid, driving the directional migration and accumulation of micron / nanoscale particles in specific areas. This non-contact technology can overcome the limitations of Brownian motion and viscous resistance in high-viscosity, complex matrix environments such as oil, enabling efficient dynamic accumulation of wear particles. This provides a solution to the numerous pain points that affect detection accuracy in traditional LIBS technology, such as sparse wear particle distribution, low wear particle concentration, and matrix effects.

[0003] A search of existing relevant literature revealed that Chinese invention patent publication number CN105911028A describes a droplet generation device based on a microfluidic chip and piezoelectric ceramic elements, and a method for performing LIBS detection on liquid samples. This device uses piezoelectric ceramics to drive liquid through microchannels to form microdroplets, enabling focused breakdown detection using LIBS. However, this device is unable to achieve continuous sampling, resulting in low detection efficiency. Chinese invention patent publication number CN117074389A describes an online detection system and method for inorganic harmful trace elements in water. This system uses a commercially available microfluidic chip to generate droplets and then uses a conveyor belt for continuous detection. However, this system is unable to achieve enrichment of the sample to be detected and cannot avoid problems such as reduced detection accuracy due to limited plasma excitation efficiency. Summary of the Invention

[0004] Purpose of the invention: To address the problems of insufficient detection accuracy and inability to perform continuous automatic sampling in the LIBS detection system in the context of oil wear particle detection due to sparse distribution of wear particles and low concentration of wear particles, the present invention provides an oil wear particle enrichment chip based on acoustic manipulation, a LIBS detection system and method.

[0005] Technical solution: To solve the above problems, the present invention adopts an oil-abrasive enrichment chip based on acoustic manipulation, comprising a shell, an enrichment layer installed in the shell, and a piezoelectric ceramic installed on the enrichment layer, wherein the piezoelectric ceramic is driven by an electrical signal; an enrichment flow channel is provided on the enrichment layer, and the enrichment flow channel comprises an enrichment section and several diversion sections, wherein the several diversion sections all start at the end point of the enrichment section, and one of the diversion sections is located on the same straight line as the enrichment section; a liquid inlet is provided at the starting point of the enrichment section, and a liquid outlet is provided at the end point of the diversion section.

[0006] Furthermore, the shell includes a lower pressure plate, a lower support plate, a lower sealing layer, an upper sealing layer, an upper support plate, and an upper pressure plate stacked in sequence from bottom to top, and the enrichment layer is located between the lower sealing layer and the upper sealing layer; the lower pressure plate, the lower support plate, and the lower sealing layer are all provided with openings corresponding to the positions of the liquid inlet and the liquid outlet.

[0007] Furthermore, the lower sealing layer and the upper sealing layer are made of PDMS material.

[0008] The present invention also provides a detection system including the above-mentioned oil abrasive enrichment chip based on sound manipulation, and also includes a driving device, a detection chip, a pulse pump, and a LIBS spectral analysis module. The driving device is used to emit an electrical signal of a preset frequency to stimulate the piezoelectric ceramic to form a preset sound field in the enrichment channel, and the oil abrasive particles are directionally aggregated under the action of the sound field and flow out through the corresponding liquid outlet; the pulse pump is used to pump the oil enriched by the enrichment chip into the detection chip; the detection chip is used to disperse the enriched oil for a second time, and the LIBS spectral analysis module is used to perform breakdown detection on the oil dispersed by the detection chip to obtain oil spectral data.

[0009] Furthermore, a detection layer is provided in the detection chip, and a detection flow channel is provided on the detection layer. The detection flow channel includes an S-shaped dispersion section and a linear breakdown section. The starting point of the breakdown section is the end point of the dispersion section. The starting point of the dispersion section is provided with a liquid inlet hole, and the end point of the breakdown section is provided with a liquid outlet hole.

[0010] Furthermore, it also includes a liquid storage tank, the enrichment chip and the detection chip are connected to the liquid storage tank through pipelines, a pulse pump is set on the pipeline connecting the detection chip and the liquid storage tank, and the liquid storage tank has a heating device and a stirring device.

[0011] Furthermore, it also includes a chip fixture for clamping the enrichment chip and the detection chip, the chip fixture includes a chip support, a chip slot arranged on the chip support, and a Luer connector arranged in the chip slot, the chip slot is used to place the chip, and the Luer connector corresponds to the position of the liquid inlet and the liquid outlet to achieve communication.

[0012] The present invention also provides a detection method using the above detection system, comprising the following steps:

[0013] Step 1: Turn on the driving device to send out an electrical signal of a preset frequency, input the oil to be tested into the enrichment chip, and complete the enrichment of oil abrasive particles through the acoustic field generated by the piezoelectric ceramic in the enrichment flow channel;

[0014] Step 2: The enriched oil is pumped into the detection chip through a pulse pump at a frequency of f1;

[0015] Step 3: The enriched oil to be tested is dispersed again in the detection chip and breakdown detected by the LIBS spectrum analysis module. The breakdown detection frequency is f2, f1=f2, and the working process of the pulse pump and the LIBS spectrum analysis module differ by half a cycle.

[0016] Furthermore, the driving device emits an electrical signal of 1.44 MHz, and the enriched oil flows out from a diversion section located on the same straight line as the enrichment section, and the end point of the diversion section is connected to the detection chip.

[0017] Furthermore, the driving device emits an electrical signal of 2.88 MHz, and the enriched oil flows out from a diversion section that is not on the same straight line as the enrichment section, and the end point of the diversion section is connected to the detection chip.

[0018] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: (1) the abrasive particles in the oil are enriched by the enrichment chip, thereby increasing the abrasive particle concentration in the oil to be tested, laying the foundation for improving the accuracy of subsequent LIBS detection; (2) through the closed-loop system of dynamic enrichment in the acoustic field-pulse pump timing delivery-LIBS high-frequency detection, real-time and continuous analysis of the abrasive particle composition of the oil is realized, breaking through the limitations of the traditional static sampling mode. The modular design of the enrichment chip and the detection chip supports different flow and scene requirements, and is adapted to complex working conditions such as aircraft engines and spacecraft lubrication systems; (3) the pulse pump and the LIBS spectral analysis module are used for timing staggered coordinated control to complete laser breakdown detection during the oil flow interval, realize continuous sampling detection, avoid the influence of flow turbulence on spectral stability, and improve the overall anti-interference ability of the detection system; (4) the heating and stirring functions of the stirring liquid storage tank further eliminate the oil viscosity fluctuation and abrasive agglomeration phenomenon, and cooperate with the serpentine flow channel inertial dispersion design of the microfluidic chip to greatly reduce the interference of factors such as abrasive stacking on spectral analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the overall structure of the enrichment chip of the present invention;

[0020] Figure 2 This is an exploded diagram of the enrichment chip structure of the present invention;

[0021] Figure 3 This is the main view of the enrichment layer of the present invention;

[0022] Figure 4 Schematic diagram of the overall structure of the detection chip of the present invention;

[0023] Figure 5 This is the main view of the detection layer of the present invention;

[0024] Figure 6 This is an exploded view of the chip fixture structure of the present invention;

[0025] Figure 7 Schematic diagram of the detection principle of the present invention;

[0026] Figure 8 Schematic diagram of the detection process of the present invention;

[0027] Figure 9 This is a schematic diagram of the enrichment process of Example 1;

[0028] Figure 10 This is a schematic diagram of the detection process of Example 1;

[0029] Figure 11 This is a schematic diagram of the enrichment process of Example 2;

[0030] Figure 12 Schematic diagram of the overall structure of the three-size enrichment chip;

[0031] Figure 13 Exploded diagram of the structure of the three-dimensional enrichment chip. DETAILED DESCRIPTION

[0032] Example 1

[0033] like Figure 1 and Figure 2 As shown, in this embodiment, an oil abrasive enrichment chip based on acoustic manipulation includes a shell and an enrichment layer 104 installed in the shell. The shell includes a lower pressure plate 101, a lower support plate 102, a lower sealing layer 103, an upper sealing layer 105, an upper support plate 106, and an upper pressure plate 107 stacked in sequence from bottom to top. The enrichment layer 104 is located between the lower sealing layer 103 and the upper sealing layer 105. Screw holes 1011 are provided on each layer of the enrichment chip, and each layer is fixedly connected by tightening screws 108.

[0034] like Figure 3As shown, enrichment channel 1041 is provided on enrichment layer 104. Enrichment channel 1041 includes an enrichment section AB and three branching sections. The three branching sections are formed by bifurcating from the enrichment section terminal B. The middle branching section is located on the same straight line as the enrichment section, and the other two branching sections are symmetrically arranged on either side. A liquid inlet hole 2' is provided at the starting point A of the enrichment section, and liquid outlet holes 4', 5', and 6' are provided at the end of the branching section. The layers of the chip housing located below the enrichment layer 104 also have corresponding openings to connect the liquid inlet and outlet channels. A protruding side edge extends from the lower portion of the enrichment layer 104, and the piezoelectric ceramic 109 is adhered to this protruding side edge using conductive silver paste.

[0035] In this embodiment, the lower pressure plate 101 and the upper pressure plate 107 are made of 6061 aluminum alloy using CNC machining technology; the lower support plate 102 and the upper support plate 106 are made of PC plates using CNC laser cutting technology; the lower sealing layer 103 and the upper sealing layer 105 are made of PDMS material; the upper sealing layer 105 and the upper support plate 106 are both made of transparent materials; the enrichment layer 104 is made of 201 stainless steel plates using CNC laser cutting technology; the piezoelectric ceramic 109 is a commercially available strip PZT-8 lead zirconate titanate piezoelectric ceramic.

[0036] The enrichment principle of the enrichment chip of the present invention is as follows: an electric signal of a specific frequency is used to excite the piezoelectric ceramic 109, so that a specific acoustic field is formed in the enrichment channel 1041. The oil is input into the enrichment channel 1041 from the liquid inlet. The specific acoustic field will drive the directional movement of the abrasive particles in the oil. Depending on the frequency of the applied electric signal, the abrasive particles can move to the middle or both sides. Finally, the oil containing different concentrations of abrasive particles flows out through different bifurcated sections, and the enriched oil and waste liquid are collected and stored separately. The enrichment chip 1 of the present invention actively enriches sparsely distributed abrasive particles in the oil through acoustic manipulation technology (ultrasonic standing wave field) to overcome the problems of insufficient plasma excitation efficiency and reduced detection accuracy caused by low abrasive concentration in traditional LIBS.

[0037] This embodiment also provides a detection system including the enrichment chip 1 described above, and further comprising a drive device, a detection chip 2, a chip fixture, a liquid reservoir 3, a pulse pump 4, and a LIBS spectral analysis module 5. The drive device is configured to emit an electrical signal of a preset frequency to excite the piezoelectric ceramic 109 to form a preset acoustic field in the enrichment channel 1041. In this embodiment, the drive device is a signal generator.

[0038] like Figure 4 As shown, the detection chip 2 is used to disperse the enriched oil for the second time. Specifically, the detection chip 2 includes a shell and a detection layer 210 disposed in the shell. The shell has the same structure as the enrichment chip shell. Figure 5As shown, a detection channel 2101 is provided on the detection layer 210, and the detection channel 2101 includes an S-shaped dispersion section CD and a linear breakdown section DE. The starting point of the breakdown section is the end point of the dispersion section, and a liquid inlet hole 2" is provided at the starting point C of the dispersion section, and a liquid outlet hole 5" is provided at the end point E of the breakdown section. After the oil flows in from the liquid inlet hole 2", it passes through the S-shaped channel and uses the inertial force to evenly disperse the abrasive particles in the enriched oil again, thereby minimizing the detection error caused by the spatial overlap of the abrasive particles. After that, it flows into the breakdown section to wait for breakdown detection, and finally flows out from the liquid outlet hole 5". By performing a secondary dispersion of the oil abrasive particles through the detection chip 2 and then performing breakdown detection, the confidence of the detection results of the LIBS spectral analysis module is improved, and the problems of unstable and inaccurate detection results caused by weak spectral signals and high background noise in the oil environment are effectively solved.

[0039] The enrichment chip 1 and the detection chip 2 are each held by a chip fixture. Figure 6 As shown, the chip fixture includes a chip fixture XY plane slide 610, a Z-axis slide 609 mounted on the XY plane slide 610, a Z-axis slide slider 607 mounted on the Z-axis slide 609, a chip fixture lower support 605 mounted on the Z-axis slide slider 607, and a chip fixture upper cover 601 mounted on the top of the Z-axis slide 609. A backlight 604 is provided on the chip fixture lower support 605, and a wire harness plate 608 is provided on the Z-axis slide 609. The chip fixture lower support 605 also has a chip slot 603. The chip slot 603 has multiple through holes corresponding to the positions of the chip liquid inlet and outlet, and a Luer connector 602 is installed in the through holes. When clamping the chip, first slide the Z-axis slide block 607 downward to keep it away from the chip clamp cover 601, then place the chip in the chip slot 603, and then slide the Z-axis slide block 607 upward to press it against the chip clamp cover 601. At this time, the Luer connector 602 is pressed and sealed against the lower side of the chip and connected to the liquid inlet and outlet.

[0040] Reservoir 3 stores the oil enriched by enrichment chip 1. Both enrichment chip 1 and detection chip 2 are connected to reservoir 3 via pipes. A pulse pump 4 is located on the pipe connecting detection chip 2 and reservoir 3. Reservoir 3 includes a heating and stirring mechanism to ensure uniform dispersion of the abrasive particles in the oil. Pulse pump 4 pumps the oil enriched by enrichment chip 1 into detection chip 2. LIBS spectral analysis module 5 performs breakdown testing on the oil dispersed by detection chip 2 to obtain oil spectral data.

[0041] like Figure 7 and Figure 8 As shown, this embodiment also provides a detection method of the above detection system, including the following steps:

[0042] Step 1: Figure 9As shown, the drive device is turned on to emit a 1.44MHz electrical signal, which feeds the oil to be tested into the enrichment chip from the liquid inlet 2'. The oil abrasive particles are then enriched through the piezoelectric ceramic 109 and the enrichment channel 1041. The 1.44MHz electrical signal drives the piezoelectric ceramic 109 to generate a preset acoustic field, which drives the oil abrasive particles to move in a directional manner toward the center of the enrichment channel 1041. After passing through the enrichment section AB, the enriched oil with a high abrasive particle concentration flows into the middle diversion section and out of the liquid outlet 5', where it is collected through a pipeline into the liquid reservoir 3. The waste liquid with a low abrasive particle concentration flows into the diversion sections on both sides and out of the liquid outlets 4' and 6' for separate collection.

[0043] Step 2: Collect the enriched oil in the liquid reservoir 3 and pump it into the detection chip 2 through the pulse pump 4 at a frequency f1.

[0044] Step 3: Figure 10 As shown, the enriched oil to be tested is secondary dispersed in the detection chip 2 and breakdown detection is performed by the LIBS spectral analysis module 5. The LIBS device laser should be focused on the center of the microchannel, and the laser spot size should be smaller than the microchannel diameter. The breakdown detection frequency is f2, f1 = f2, and the working processes of the pulse pump 4 and the LIBS spectral analysis module 5 differ by half a cycle. This frequency setting enables the LIBS spectral analysis module 5 to stop detecting when the pulse pump 4 pumps the liquid, and to start detecting when the pulse pump 4 stops. Based on this alternating operation, while reducing detection errors, continuous sampling detection can be achieved, obtaining a large amount of detection data over a period of time. After processing, an average detection result based on multiple detection results can be obtained, increasing detection accuracy. In addition, completing laser breakdown detection during the intermittent period of oil flow can also avoid the influence of flow turbulence on spectral stability.

[0045] The detection system and detection method of the present invention realize real-time continuous analysis of oil wear particle components through a closed-loop system of dynamic enrichment in the acoustic field - pulse pump timed delivery - LIBS high-frequency detection, breaking through the limitations of the traditional static sampling mode. The modular design of the enrichment chip and the detection chip supports different flow and scenario requirements, and is adapted to complex working environments such as aircraft engines and spacecraft lubrication systems.

[0046] Example 2

[0047] This embodiment provides another detection method. The detection system used is different from that of the first embodiment in that the liquid reservoir 3 is connected to the liquid outlets 4' and 6' of the enrichment chip 1. The rest of the structure is the same. The following steps are included:

[0048] Step 1: Figure 11As shown, the driving device is turned on to emit a 2.88MHz electrical signal, which feeds the oil to be tested into the enrichment chip from the liquid inlet 2'. The oil abrasive particles are then enriched through the piezoelectric ceramic 109 and the enrichment channel 1041. The 2.88MHz electrical signal drives the piezoelectric ceramic 109 to generate a preset acoustic field, which drives the oil abrasive particles to move in a directional manner toward the two sides of the enrichment channel 1041. After passing through the enrichment section AB, the enriched oil with a high abrasive particle concentration flows into the diversion sections on both sides and out of the liquid outlets 4' and 6', where it is collected through a pipeline into the liquid reservoir 3. The waste liquid with a low abrasive particle concentration flows into the middle diversion section and out of the liquid outlet 5' for separate collection.

[0049] Steps 2 and 3 are the same as those in Example 1.

[0050] Example 3

[0051] like Figure 12 and Figure 13 As shown, this embodiment provides a large-scale enrichment chip structure that achieves higher processing throughput by modifying the size of the flow channel. The large-scale enrichment chip 7 includes a large-scale chip lower pressure plate 701, a large-scale chip lower support plate 702, a lower silicone rubber sealing layer 703, a large-scale enrichment layer 704, an upper silicone sealing layer 707, a large-scale chip upper support plate 708, and a large-scale chip upper pressure plate 709, which are stacked in sequence from bottom to top. Each layer is provided with a screw hole, and the layers are fixedly connected by tightening bolts 710. A large-scale enrichment flow channel 7041 is provided on the large-scale enrichment layer 704. The shape of the flow channel is the same as that of the first embodiment, including an enrichment section and three diversion sections. The enrichment section is provided with a liquid inlet at the starting point and a liquid outlet at the end of the diversion section. The large-scale enrichment layer 704 has an opening on the side that is connected to the liquid inlet and liquid outlet respectively. The opening is installed with a liquid quick-release connector 706, which is used to connect to the liquid pipeline. Two large-sized piezoelectric ceramics 705 are symmetrically arranged on the large-sized enriched layer 704 .

[0052] When assembling the large-size enrichment chip 7, the chip structures are arranged as follows: Figure 13 After stacking in the order shown, tighten the fixing bolts to complete the assembly. After the overall installation is completed, use epoxy resin glue to stick the two large-sized piezoelectric ceramics 705 to the left and right outer sides of the large-sized enriched flow channel 7041 respectively. Here, the paired large-sized piezoelectric ceramics 705 can better generate standing waves in the chip to overcome the effects of the weakening of the sound field caused by the increase in the flow channel size.

[0053] In this embodiment, the large-size chip lower pressure plate 701 and the large-size chip upper pressure plate 709 are made of 6061 aluminum alloy using CNC machining technology; the large-size chip lower support plate 702 and the large-size chip upper support plate 708 are made of PC using CNC laser cutting technology; the lower silicone rubber sealing layer 703 and the upper silicone sealing layer 707 are made by cutting silicone rubber; the large-size enrichment layer 704 is made of 6061 aluminum alloy using CNC machining technology, and a threaded hole is opened on its side, which can be screwed into the liquid quick-release connector 706 for supplying liquid to the flow channel; the large-size piezoelectric ceramic 705 is a commercially available strip PZT-8 lead zirconate titanate piezoelectric ceramic.

[0054] The enrichment principle of the large-size enrichment chip 7 of this embodiment is the same as that of the enrichment chip 1 of the first embodiment, and the detection methods of the first and second embodiments can be used for detection.

[0055] In summary, the LIBS detection system based on the acoustically manipulated oil abrasive particle enrichment chip of the present invention combines acoustically manipulated microfluidics technology with LIBS technology, and can achieve efficient enrichment of abrasive particles in oil while performing continuous sampling and detection. Compared with traditional detection methods, it improves detection accuracy and reduces operation difficulty, making it possible to conveniently and quickly monitor the health status of mechanical equipment and predict its lifespan.

Claims

1. An oil wear particle enrichment chip based on acoustic manipulation, characterized in that: The invention comprises a shell, an enrichment layer (104) installed in the shell, and a piezoelectric ceramic (109) installed on the enrichment layer (104), wherein the piezoelectric ceramic (109) is driven by an electrical signal; an enrichment flow channel (1041) is provided on the enrichment layer (104), and the enrichment flow channel (1041) comprises an enrichment section and a plurality of diversion sections, wherein the plurality of diversion sections all take the end point of the enrichment section as a starting point, and one of the diversion sections is located on the same straight line as the enrichment section; a liquid inlet is provided at the starting point of the enrichment section, and a liquid outlet is provided at the end point of the diversion section.

2. The oil wear particle enrichment chip based on acoustic manipulation according to claim 1, characterized in that: The shell comprises a lower pressing plate (101), a lower supporting plate (102), a lower sealing layer (103), an upper sealing layer (105), an upper supporting plate (106), and an upper pressing plate (107) stacked in sequence from bottom to top, and the enrichment layer (104) is located between the lower sealing layer (103) and the upper sealing layer (105); the lower pressing plate (101), the lower supporting plate (102), and the lower sealing layer (103) are all provided with openings corresponding to the positions of the liquid inlet and the liquid outlet.

3. The oil wear particle enrichment chip based on acoustic manipulation according to claim 1, characterized in that: The lower sealing layer (103) and the upper sealing layer (105) are made of PDMS material.

4. A detection system comprising the oil wear particle enrichment chip based on acoustic manipulation according to any one of claims 1 to 3, characterized in that: The invention also includes a driving device, a detection chip (2), a pulse pump (4), and a LIBS spectrum analysis module (5). The driving device is used to emit an electrical signal of a preset frequency to excite the piezoelectric ceramic (109) to form a preset sound field in the enrichment channel (1041), and the oil abrasive particles are directed to aggregate under the action of the sound field and flow out through the corresponding liquid outlet; the pulse pump (4) is used to pump the oil enriched by the enrichment chip into the detection chip (2); the detection chip (2) is used to secondary disperse the enriched oil; and the LIBS spectrum analysis module (5) is used to perform breakdown detection on the oil dispersed by the detection chip (2) to obtain oil spectrum data.

5. The detection system according to claim 4, wherein: The detection chip (2) is provided with a detection layer (210), and the detection layer (210) is provided with a detection flow channel (2101), the detection flow channel (2101) comprising an S-shaped dispersion section and a linear breakdown section, the starting point of the breakdown section being the end point of the dispersion section, the starting point of the dispersion section being provided with a liquid inlet hole, and the end point of the breakdown section being provided with a liquid outlet hole.

6. The detection system according to claim 4, wherein: The invention also includes a liquid reservoir (3), wherein the enrichment chip and the detection chip (2) are connected to the liquid reservoir (3) through a pipeline, and a pulse pump (4) is arranged on the pipeline connecting the detection chip (2) and the liquid reservoir (3), and the liquid reservoir (3) has a heating device and a stirring device.

7. The detection system according to claim 4, wherein: The invention also includes a chip fixture for clamping the enrichment chip and the detection chip (2), wherein the chip fixture includes a chip support, a chip slot (603) arranged on the chip support, and a Luer connector (602) arranged in the chip slot (603). The chip slot (603) is used to place the chip, and the Luer connector (602) corresponds to the position of the liquid inlet and the liquid outlet to achieve communication.

8. A detection method according to any one of claims 4 to 7, characterized in that: The following steps are involved: Step 1: Turn on the driving device to send out an electrical signal of a preset frequency, input the oil to be tested into the enrichment chip, and complete the enrichment of oil abrasive particles through the preset sound field generated by the piezoelectric ceramic (109) in the enrichment channel (1041); Step 2: The enriched oil is pumped into the detection chip (2) through a pulse pump (4) at a frequency f1; Step 3: The enriched oil to be tested is dispersed secondary in the detection chip (2) and subjected to breakdown detection by the LIBS spectrum analysis module (5). The breakdown detection frequency is f2, f1=f2, and the working processes of the pulse pump (4) and the LIBS spectrum analysis module (5) differ by half a cycle.

9. The detection method according to claim 8, wherein The driving device emits an electrical signal of 1.44 MHz, and the enriched oil flows out from a diversion section located on the same straight line as the enrichment section, and the end point of the diversion section is connected to the detection chip (2).

10. The detection method according to claim 8, wherein The driving device emits an electrical signal of 2.88 MHz, and the enriched oil flows out from a diversion section that is not located on the same straight line as the enrichment section, and the end point of the diversion section is connected to the detection chip (2).

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