CN113031083A - Signal processing device and method for detecting metal particles in working solution - Google Patents
Signal processing device and method for detecting metal particles in working solution Download PDFInfo
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- 239000002923 metal particle Substances 0.000 title claims abstract description 91
- 238000012545 processing Methods 0.000 title claims abstract description 50
- 239000012224 working solution Substances 0.000 title abstract description 11
- 238000000034 method Methods 0.000 title description 11
- 230000003321 amplification Effects 0.000 claims abstract description 50
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 50
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 230000006698 induction Effects 0.000 claims abstract description 31
- 239000012530 fluid Substances 0.000 claims description 34
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 238000001914 filtration Methods 0.000 claims description 18
- 238000003672 processing method Methods 0.000 claims description 5
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 2
- 230000005284 excitation Effects 0.000 description 34
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- 238000010586 diagram Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000012809 cooling fluid Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 210000003437 trachea Anatomy 0.000 description 2
- 239000002966 varnish Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000013528 metallic particle Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
- G01V3/104—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
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Abstract
The invention discloses a signal processing device for detecting metal particles in a working solution, which comprises a first amplifying circuit, a second amplifying circuit and a detection circuit, wherein the first amplifying circuit is used for amplifying a sensing signal by a first amplifying factor, and the magnitude of the first amplifying factor is set to ensure that the sensing signal processing device can determine the existence of the metal particles with a first size by analyzing the sensing signal amplified by the first amplifying factor; a second amplification circuit for amplifying the sensing signal by a second amplification factor, wherein the second amplification factor is sized such that the sensing signal processing means can determine the presence of metal particles having a second size by analyzing the sensing signal amplified by the second amplification factor, wherein the second size is larger than the first size; and the induction signal processing device is used for determining the existence of the metal particles and the size of the metal particles according to the output signals of the first amplifying circuit and the second amplifying circuit respectively.
Description
Technical Field
The invention relates to a metal particle detection technology, in particular to a signal processing device and a signal processing method for detecting metal particles in working fluid.
Background
For products with worn metal parts such as gears, the performance of the products can be effectively ensured by detecting the wear condition of the gears in real time. When the product adopts working fluid such as oil lubrication or cooling fluid, metal particle detection equipment can be arranged in a working fluid path, specifically, a feedback coil and a symmetrical exciting coil are arranged on a working fluid pipeline, and then whether metal particles pass through is judged according to the change of a magnetic field of the feedback coil, so that whether part abrasion is generated is judged.
However, the detection range of the current particle detection device is very limited, and the detection device capable of detecting small particles is often difficult to correctly detect large particles.
Disclosure of Invention
In view of some or all of the problems in the prior art, the present invention provides, in one aspect, a signal processing apparatus for detection of metal particles in a working fluid, including:
a first amplification circuit for amplifying the sensing signal by a first amplification factor, wherein the first amplification factor is sized such that the sensing signal processing means can determine the presence of metal particles having a first size by analyzing the sensing signal amplified by the first amplification factor;
a second amplification circuit for amplifying the sensing signal by a second amplification factor, wherein the second amplification factor is sized such that the sensing signal processing means can determine the presence of metal particles having a second size by analyzing the sensing signal amplified by the second amplification factor, wherein the second size is larger than the first size; and
and the induction signal processing device is used for determining whether metal particles exist and the size of the metal particles according to the output signals of the first amplifying circuit and the second amplifying circuit respectively.
Furthermore, the signal processing device further comprises a primary filtering and amplifying circuit, and the primary filtering and amplifying circuit is used for performing primary filtering and amplification on the induction signal.
Furthermore, the signal processing device further comprises an analog-to-digital conversion circuit for respectively performing analog-to-digital conversion on the output analog signals of the first amplification circuit and the second amplification circuit.
Further, the second amplification factor is set such that the amplitude of the second multiplied sensing signal does not reach saturation.
Further, the second size is the size of the largest possible metal particles in the working fluid.
Further, the induction signal is generated by an intermediate feedback coil of the working liquid metal particle detection device.
The invention also provides a signal processing method for detecting the metal particles in the working solution, which comprises the following steps:
filtering and primarily amplifying the induction signal generated by the middle feedback coil through a primary filtering and amplifying circuit;
amplifying the signals processed by the primary filtering and amplifying circuit by different times through each secondary amplifying circuit, and performing analog-to-digital conversion; and
and the induction signal processing device receives the numerical value after the analog-to-digital conversion, and calculates the amplitude of the induction signal generated by the middle feedback coil according to the numerical value so as to determine the size of the metal particles.
Further, the signal processing method further comprises the step of sending out an alarm by the induction signal processing device once the size of the metal particles exceeds a threshold value.
The present invention is based on the following insight of the inventors: the inventor finds that the reason that the detection equipment capable of detecting the small particulate matters is often difficult to accurately detect the large particulate matters is mainly that the signals induced by the tiny particles are very small, and the signals are generally required to be amplified at high times in order to be detected; however, in the application of the large gear box, when the large gear box is severely worn, large-size metal particles are generated, when the large-size metal particles pass through the coil, the feedback coil induces a large-amplitude signal, and the signal after high-power amplification is saturated, so that the large-size particles cannot be identified. In view of the above, the signal processing device and method for detecting metal particles in a working solution provided by the invention comprise a plurality of paths of amplifying and analog-to-digital converting circuits, wherein the amplifying times of all the paths are different, and a plurality of paths of signals are all transmitted to the sensing signal processing device.
Drawings
To further clarify the above and other advantages and features of embodiments of the present invention, a more particular description of embodiments of the present invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings, the same or corresponding parts will be denoted by the same or similar reference numerals for clarity.
FIG. 1 is a schematic diagram of a device for detecting metal particles in a working fluid according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for manufacturing a coil of an apparatus for detecting metal particles in a working fluid according to an embodiment of the present invention;
FIGS. 3a-3c are schematic diagrams illustrating a process of a coil manufacturing method of a device for detecting metal particles in a working fluid according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a signal processing device of an apparatus for detecting metal particles in a working fluid according to an embodiment of the present invention; and
fig. 5 is a schematic structural diagram illustrating a calibration system of a device for detecting metal particles in a working fluid according to an embodiment of the present invention.
Detailed Description
In the following description, the present invention is described with reference to examples. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details, or with other alternative and/or additional methods, materials, or components. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention. Similarly, for purposes of explanation, specific numbers, materials and configurations are set forth in order to provide a thorough understanding of the embodiments of the invention. However, the invention is not limited to these specific details. Further, it should be understood that the embodiments shown in the figures are illustrative representations and are not necessarily drawn to scale.
Reference in the specification to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.
It should be noted that the embodiment of the present invention describes the process steps in a specific order, however, this is only for the purpose of illustrating the specific embodiment, and does not limit the sequence of the steps. Rather, in various embodiments of the present invention, the order of the steps may be adjusted according to process adjustments.
In order to realize the detection of the abrasion of the gear, aiming at the product lubricated or cooled by oil, the invention provides a detection device for metal particles in working fluid, wherein the working fluid refers to oil, cooling fluid, insulating fluid and the like. The solution of the invention is further described below with reference to the accompanying drawings of embodiments.
Fig. 1 is a schematic structural diagram of a device for detecting metal particles in a working fluid according to an embodiment of the present invention. As shown in FIG. 1, the device for detecting metal particles in working fluid comprises a coil, an excitation module 102 and a signal processing module 103.
The coils are wound on a bobbin outside the working fluid pipe 001, and include a first excitation coil 111, a second excitation coil 112, and an intermediate feedback coil 113, which are fixed by an insulating varnish, wherein the coil windings of the first excitation coil and/or the second excitation coil and/or the intermediate feedback coil are configured such that an amplitude of an induction signal induced by the intermediate feedback coil when no metal particles pass is lower than a threshold value. The first and second excitation coils 111 and 112 are disposed at the working fluid pipeline for generating a first and a second magnetic fields, in an embodiment of the present invention, the first and second excitation coils 111 and 112 are electrically connected to the excitation module 102, and the excitation module 102 sends out an excitation signal, so that the first excitation coil generates a first magnetic field and the second excitation coil generates a second magnetic field, wherein the direction of the magnetic field of the second magnetic field at a neutral point between the first and second excitation coils is opposite to the direction of the magnetic field of the first magnetic field, and in an embodiment of the present invention, the intermediate feedback coil 113 is disposed at the neutral point for inducing a superimposed magnetic field of the first and second magnetic fields to induce an induction signal. In the embodiment of the present invention, a second resonant capacitor 022 is connected between both ends of the first excitation coil 111 and between both ends of the second excitation coil 112, and a first resonant capacitor 021 is connected between both ends of the intermediate feedback coil 113.
In one embodiment of the present invention, a bobbin is disposed outside the working fluid pipe 001, the bobbin includes a first groove, a second groove and a third groove, and the middle feedback coil, the first excitation coil and the second excitation coil are disposed in the second groove, the first groove and the third groove, respectively.
The signal processing module 103 is electrically connected to the intermediate feedback coil 113, and is configured to sense a voltage of the intermediate feedback coil, amplify the voltage, and generate an output signal indicating whether metal particles exist and sizes of the metal particles according to an amplitude of a sensing signal of the intermediate feedback coil. In an embodiment of the present invention, a printed circuit board is further disposed on one side of the bobbin, the first resonant capacitor 021 and the second resonant capacitor 022 are integrated on the printed circuit board, and the printed circuit board further includes a connection pad for connecting the intermediate feedback coil, the first excitation coil, the second excitation coil, the excitation module and the signal processing module.
The coil is limited by the manufacturing process, and the coil is difficult to be completely symmetrical in physical structure, so that the induction voltage in the middle feedback coil is not 0 even if no metal particles pass through the coil, the difficulty of detecting a tiny induction signal is further increased, and the voltage is called as background voltage or background noise. In order to eliminate the background voltage, the invention optimizes the coil manufacturing method of the working solution metal particle detection equipment. Fig. 2 and 3a-3c respectively show a flow chart and a process diagram of a coil manufacturing method of a working fluid metal particle detection device according to an embodiment of the invention. As shown in the figure, the method for manufacturing the coil in the oil working fluid metal particle detection device comprises the following steps:
first, in step 201, an initial coil is wound. A middle feedback coil 113, a first excitation coil 111 and a second excitation coil 112 are wound on the bobbin 002, wherein the first excitation coil and the second excitation coil are symmetrically arranged at two sides of the middle feedback coil, the state of the coil after the primary winding is shown in fig. 3a, the bobbin 002 is wrapped on the outer surface of the working fluid pipeline 001, the bobbin 002 comprises a first groove 0021, a second groove 0022 and a third groove 0023, the first groove and the third groove are symmetrically arranged at two sides of the second groove, the first excitation coil 111 is wound in the first groove, the middle feedback coil is wound in the second groove, the second excitation coil is wound in the third groove, a first resonance capacitor 021 and a second resonance capacitor 022 are integrated on the printed circuit board 003, and the printed circuit board 003 is electrically connected with the first excitation coil 111 and the second excitation coil 112 through a first bonding pad 031, and electrically connected to the intermediate feedback coil 113 through the second pad 032;
next, at step 202, the coil arrangement is adjusted. Measuring the amplitude of the induction signal of said intermediate feedback coil when no metal particles pass, and if said amplitude exceeds a threshold value, adjusting the coil arrangement of the first excitation coil and/or the second excitation coil and/or said intermediate feedback coil such that said amplitude is below said threshold value, in one embodiment of the invention the adjustment of the coil arrangement comprises: adjusting a coil position of an outermost layer of the first excitation coil and/or the second excitation coil and/or the intermediate feedback coil such that the amplitude is below the threshold. In the embodiment of fig. 3b, this is achieved by adjusting the outermost coil position of the intermediate feedback coil: firstly, according to the difference value between the amplitude value and the threshold value, adjusting 72-74 turns of the outermost winding to be close to one side of the first excitation coil, measuring the amplitude value of the induction signal of the middle feedback coil again, and if the amplitude value is still higher than the threshold value, further adjusting 68-74 turns of the outermost winding to be close to one side of the first excitation coil, as shown in fig. 3c, and at the moment, the amplitude value is lower than the threshold value, and finishing the coil arrangement; and
finally, in step 203, the coil is secured. The fixing is performed by using insulating varnish 004 to prevent the coil winding position from changing.
Since the signal induced by the fine particles is small, high magnification is usually required to detect the signal. When the large-size metal particles pass through the coil, the feedback coil induces a large-amplitude induction signal, and the signal after high-power amplification is saturated, so that the large-size particles cannot be identified. To solve this problem, in an embodiment of the present invention, the signal processing module 103 includes a signal processing device for detecting metal particles in the working fluid, wherein multiple amplification and analog-to-digital conversion circuits are provided, and the amplification factor of each of the multiple amplification circuits is different, and all the signals are transmitted to an inductive signal processing device, such as a micro central processing unit (MCU), so as to perform comprehensive judgment. Fig. 4 is a schematic circuit diagram of a signal processing device of an operating fluid metal particle detection apparatus according to an embodiment of the present invention. As shown in fig. 4, the signal processing module 103 includes a primary filtering and amplifying circuit 301, a plurality of secondary amplifying circuits 3021, 3022 … … 302n, analog-to- digital conversion circuits 3031, 3032 … … 303n, and a sensing signal processing device 304. The input end of the primary filtering and amplifying circuit 301 is connected to two ends of the middle feedback coil, and is configured to perform primary filtering and amplifying on the induction signal, the output end of the primary filtering and amplifying circuit 301 is connected to the input ends of the two- stage amplifying circuits 3021 and 3022 … … 302n, and the primary filtering and amplifying circuit 301 includes a filtering circuit and a primary amplifying circuit; the input ends of the analog-to- digital conversion circuits 3031 and 3032 … … 303n are respectively connected to the output ends of the second- stage amplification circuits 3021 and 3022 … … 302n for performing analog-to-digital conversion on the analog signals output by the second-stage amplification circuits, and the sensing signal processing device 304 is connected to the output ends of the analog-to- digital conversion circuits 3031 and 3032 … … 303n for judging whether metal particles exist or not according to the output values of the analog-to-digital conversion circuits and determining the sizes of the metal particles. In the embodiment of the invention, the amplification factor of each secondary amplification circuit is set according to the size of the metal particles which can be generated, and the larger the metal particles which can be generated, the smaller the amplification factor setting of the secondary amplification circuit. In one embodiment of the invention, two-stage amplification circuits are provided, including a first amplification circuit and a second amplification circuit, wherein the first amplification circuit is used for amplifying the induction signal by a first amplification factor, wherein the first amplification factor is set to a size that enables the induction signal processing device to determine the existence of the metal particles with a first size by analyzing the induction signal amplified by the first amplification factor; and a second amplifying circuit for amplifying the sensing signal by a second amplification factor, wherein the second amplification factor is set such that the amplitude of the sensing signal amplified by the second amplification factor does not reach saturation, i.e. the sensing signal processing apparatus can determine the presence of metal particles having a second size by analyzing the sensing signal amplified by the second amplification factor, wherein the second size is larger than the first size, and the second size is the size of the metal particles that are most likely to occur in the working fluid.
Based on the signal processing device, the detection and size judgment of the metal particles comprises the following steps:
when metal particles pass through the coils, the intermediate feedback coils generate induction signals, the induction signals are filtered and primarily amplified by the primary filtering and amplifying circuit, then are output to each amplifier to be amplified by different times, finally, the amplified signals are subjected to analog-to-digital conversion and then are transmitted to the induction signal processing device, and the induction signal processing device calculates the amplitude of the induction signals generated by the intermediate feedback coils according to the output values of each analog-to-digital conversion circuit, so that whether the metal particles exist or not and the size of the metal particles are determined. In one embodiment of the present invention, the sensing signal processing device may also send an alarm to remind a component replacement or repair should a particle exceed a threshold size occur.
In this application, the term "signal does not reach saturation" means that the signal does not reach the maximum range or the upper limit of the detection range of the detection or analysis instrument or the sensing signal processing device, i.e. the signal does not reach the sensing signal corresponding to the maximum particle size that may occur. That is, after signal amplification, the detection or analysis instrument or the inductive signal processing device can still determine the correct result, here the metal particle size, from the amplified signal without causing signal saturation or overflow.
In yet another embodiment of the present invention, a conversion relation table between the signal amplitude and the particle size is stored in the processor, and after the processor acquires the output value of each analog-to-digital conversion circuit, the particle size can be accurately determined according to the conversion relation table. And obtaining the conversion relation table through factory calibration. Fig. 5 is a schematic structural diagram illustrating a calibration system of a device for detecting metal particles in a working fluid according to an embodiment of the present invention. As shown in fig. 5, the calibration system includes a control center 402, a particle emitting device 404, and a plurality of air pipes 403. Wherein the plurality of air pipes 403 are arranged inside the working solution pipeline 001 and penetrate through the detection area of the working solution metal particle detection device, one end of each air pipe is connected with the particle emission device 404, for containing metallic particles to be emitted by particle emitting devices, said particle emitting devices 404 being under the control of said control center 402, the metal particles with different sizes are emitted in the air pipe, the state that the metal particles flow through a working fluid pipeline is simulated in practical application, and the control center 402 is communicatively connected to the signal processing module 103 via a power and communication connection 401, for controlling the particle emitting device and sending particle size data to a signal detection module, and calibrating the working solution metal particle detection equipment according to the size of the emitted metal particles and the induction signal corresponding to the metal particles and received from the working solution metal particle detection equipment. The process of calibrating the working fluid metal particle detection equipment comprises the following steps:
firstly, a control center controls a particle emitting device to continuously and repeatedly send metal particles with the same size, meanwhile, size information of the metal particles is transmitted to a signal detection module, and after the emitted metal particles reach a trachea stopping position, the metal particles can freely fall to the trachea starting position;
next, the signal detection module stores the detected induction signal amplitude and the corresponding particle size;
then, the control center controls the particle emitting device to switch an emitting air pipe, emits metal particles with the size value increased by one, and repeats the steps until the emitting of the metal particles with the maximum size is finished; and
and finally, the signal detection module fits a 'signal amplitude and particle size conversion relation table' according to all the induction signal amplitudes and the corresponding particle sizes, and stores the conversion relation table in an internal memory.
In one embodiment of the present invention, the calibrating and detecting the size of the metal particles comprises calibrating only the smallest and largest possible sizes of the metal particles, and recording the smallest possible size as the first size and the largest possible size as the second size:
storing a first size of metal particles and a first sensing signal corresponding to the metal particles received from a working fluid metal particle detection device;
storing a second size of the metal particles and a second sensing signal corresponding to the metal particles received from the working fluid metal particle detection device, wherein the second size is larger than the first size; and
when the working fluid metal particle detection apparatus detects a third induced signal corresponding to metal particles of a third size between the first and second sizes, the third size is determined by signal fitting the first and second sizes and the first and second induced signals.
According to the working solution metal particle detection equipment provided by the invention, firstly, the coil symmetry is improved by adjusting the coil, and the production cost is reduced; secondly, a multi-path amplifying and analog-to-digital conversion circuit is used in the signal processing module, so that the detection range of the particles is enlarged; and finally, when the monitoring device leaves the factory, the detection signal is calibrated, so that the detection device can directly output the particle size information and clearly indicate the working state of the monitored device.
While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to persons skilled in the relevant art that various combinations, modifications, and changes can be made thereto without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention disclosed herein should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.
Claims (8)
1. A signal processing apparatus for detection of metal particles in a working fluid, comprising:
a first amplification circuit configured to amplify the sensing signal by a first amplification factor, wherein the first amplification factor is sized such that the sensing signal processing apparatus is capable of determining the presence of metal particles having a first size by analyzing the sensing signal amplified by the first amplification factor;
a second amplification circuit configured to amplify the sensing signal by a second amplification factor, wherein the second amplification factor is sized such that the sensing signal processing apparatus can determine the presence of metal particles having a second size by analyzing the amplified second multiple of the sensing signal, wherein the second size is larger than the first size; and
and the induction signal processing device is configured to determine the existence of the metal particles and the sizes of the metal particles according to the output signals of the first amplifying circuit and the second amplifying circuit respectively.
2. The signal processing apparatus of claim 1, further comprising a primary filtering and amplifying circuit configured to enable primary filtering and amplification of the induced signal.
3. The signal processing apparatus of claim 1, further comprising analog-to-digital conversion circuits configured to be capable of analog-to-digital converting output analog signals of the first amplification circuit and the second amplification circuit, respectively.
4. The signal processing apparatus of claim 1, wherein the second amplification factor is set such that the amplitude of the amplified second multiple of the sensing signal does not reach saturation.
5. The signal processing apparatus of claim 1, wherein the second size is a size of a largest possible metal particle in the working fluid.
6. The signal processing apparatus of any one of claims 1 to 5, wherein the induced signal is generated by an intermediate feedback coil of a liquid metal particle detection device.
7. A signal processing method for detecting metal particles in working fluid is characterized by comprising the following steps:
filtering and primarily amplifying the induction signal generated by the middle feedback coil through a primary filtering and amplifying circuit;
amplifying the signals processed by the primary filtering and amplifying circuit by different times through each secondary amplifying circuit, and performing analog-to-digital conversion; and
and the induction signal processing device receives the numerical value after the analog-to-digital conversion, and calculates the amplitude of the induction signal generated by the middle feedback coil according to the numerical value so as to determine the size of the metal particles.
8. The signal processing method of claim 7, further comprising the sensing signal processing device issuing an alarm upon the size of the metal particles exceeding a threshold.
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| CN109579894A (en) * | 2018-09-20 | 2019-04-05 | 西人马联合测控（泉州）科技有限公司 | A kind of scaling method and system of lubricating oil metal filings sensor |
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