CN117054296A - Oil abrasive particle detection method and device based on microscopic hologram and magnetic field regulation - Google Patents
Oil abrasive particle detection method and device based on microscopic hologram and magnetic field regulation Download PDFInfo
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- 239000002245 particle Substances 0.000 title claims abstract description 222
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 230000033228 biological regulation Effects 0.000 title claims abstract description 17
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 97
- 238000000034 method Methods 0.000 claims abstract description 23
- 230000003287 optical effect Effects 0.000 claims abstract description 22
- 238000001093 holography Methods 0.000 claims abstract description 12
- 238000003384 imaging method Methods 0.000 claims abstract description 11
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 230000002572 peristaltic effect Effects 0.000 claims description 5
- 238000001228 spectrum Methods 0.000 claims description 4
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 40
- 239000010687 lubricating oil Substances 0.000 abstract description 24
- 238000005259 measurement Methods 0.000 abstract description 13
- 239000007788 liquid Substances 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 11
- 230000006698 induction Effects 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 230000005307 ferromagnetism Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 238000004458 analytical method Methods 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
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- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N15/0205—Investigating particle size or size distribution by optical means
- G01N15/0227—Investigating particle size or size distribution by optical means using imaging; using holography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N15/0205—Investigating particle size or size distribution by optical means
- G01N15/0227—Investigating particle size or size distribution by optical means using imaging; using holography
- G01N2015/0233—Investigating particle size or size distribution by optical means using imaging; using holography using holography
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Abstract
The invention discloses an oil abrasive particle detection method based on microscopic holography and magnetic field regulation, which comprises the following steps: the oil to be measured is divided into a ferromagnetic particle flow and a non-ferromagnetic particle flow under the action of a magnetic field and then enters a measuring area; the laser beam is shaped by the optical element and then enters the measuring area, and the laser beam is transmitted through the ferromagnetic particles and the nonferromagnetic particles to form holographic fringes and recorded as a particle hologram; carrying out three-dimensional reconstruction, identification and positioning on the particle hologram to obtain three-dimensional position, particle size, morphology and concentration information of particles; ferromagnetic particles and non-ferromagnetic particles are classified according to z-axis position information in the three-dimensional position. The invention also discloses an oil abrasive particle detection device: the device comprises an oil liquid sampling unit, a microfluidic component, a laser unit, an imaging unit and a signal processing unit. The method and the device have simple structure and low cost, can realize the simultaneous online measurement of multiple parameters of the lubricating oil wear particles, and effectively distinguish and identify the ferromagnetic particles and the non-ferromagnetic particles.
Description
Technical Field
The invention relates to the field of liquid-solid two-phase flow particle measurement, in particular to an oil abrasive particle detection method and device based on microscopic holography and magnetic field regulation.
Background
In the neighborhood of power production, petrochemical industry, engineering machinery, ship transportation, aerospace, military equipment and the like, the safe and reliable operation of mechanical equipment is important. The lubricating oil is used as a liquid lubricant of mechanical equipment, can reduce friction and wear among mechanical parts, and has the functions of cooling, sealing, cleaning, buffering, rust prevention and the like. The used lubricating oil can carry wear particles of mechanical parts, and on-line monitoring of the wear particles has important significance for knowing the running state of mechanical equipment in time and realizing early warning of faults.
At present, the online oil monitoring technology can be divided into photoelectric type, conductive type, electromagnetic type, ultrasonic type and the like according to the principle different from a sensor. The photoelectric sensor utilizes the light shielding property and the light scattering principle of abrasive particles, and monitors the change of light when the abrasive particles pass through the sensor, so that the distribution of the abrasive particles in the oil liquid is analyzed. The conductive sensor mainly utilizes the amplitude change of resistance or dielectric constant caused by abrasive particles when oil passes through the sensor to analyze the size and distribution of the abrasive particles. Electromagnetic sensors utilize changes in magnetic fields caused by abrasive particles passing through the sensor based on electromagnetic induction. Ultrasonic type sensors utilize the echo principle or scattering properties of ultrasonic waves to determine the size and distribution of abrasive particles in oil. The chinese patent publication No. CN113418968A discloses a cross capacitance sensor, a method for manufacturing the sensor, and an oil detection system, wherein the cross capacitance sensor comprises: the micro-channel structure comprises a substrate, wherein a micro-channel is concavely carved on the substrate, and oil injection ports and oil outlets are respectively arranged at two ends of the micro-channel; the cross capacitor structure comprises 4 identical cambered copper electrodes and an electrode supporting structure, wherein the cambered copper electrodes are uniformly cut from the same cylindrical copper electrode and are adhered to the inner surface of the electrode supporting structure to be spliced into a cylindrical structure with a tiny gap between the electrodes; the cross capacitance structure is partially embedded in the substrate, so that the micro-channel axially passes through the interior of the cross capacitance structure; the invention can detect whether particles pass through according to the change of the dielectric constant between the electrodes, and can distinguish and detect solid, liquid and gas pollutants through the capacitance change value, thereby having high detection sensitivity. As disclosed in chinese patent publication No. CN105181534a, an oil abrasive particle monitoring sensor for outputting vibration signals and an oil on-line monitoring system are disclosed, wherein induction coils of the monitoring sensor are positioned between 2 overlapped plane coils parallel to each other, and the plane coils are connected with a constant current source; the central axis of the induction coil is parallel to the plane coil, and a gap is reserved between the induction coil and the plane coil; the length of the induction coil is smaller than the outer diameter of the planar coil; the sensor of the oil on-line monitoring system is arranged in a lubricating oil way of mechanical equipment, the output of an induction coil of the sensor is connected with a Maxwell-Wien bridge, and the output of the induction coil is respectively connected with oil abrasive particles and a vibration signal acquisition circuit and then connected with a microcontroller through an analog-to-digital conversion circuit. The microcontroller is internally provided with a comprehensive fault analysis module, is connected with a display screen, displays metal abrasive particle signals and vibration signals on line, and displays the current fault information of the mechanical equipment.
The above methods each have advantages and also each have a short plate. Photoelectric abrasive particle monitoring techniques have the highest sensitivity (> 2 microns), but it is difficult to distinguish between ferromagnetic and non-ferromagnetic particles, and the measurement effect is susceptible to impurity particles in the oil, such as bubbles. The sensitivity of the conductive abrasive particle monitoring technology is relatively high (> 8 microns), but the abrasive particle material types cannot be distinguished, and the abrasive particle monitoring technology is easily influenced by the chemical characteristics of oil. Ultrasonic abrasive particle monitoring techniques are suitable for high flow monitoring, but have low sensitivity (> 45 microns) and cannot distinguish between metallic and non-metallic particles. Electromagnetic abrasive particle monitoring techniques are most widely used and distinguish between ferromagnetic particles and non-ferromagnetic particles, but generally only abrasive particles above 100 microns can be measured. These in-line techniques can only be used to obtain topographical features of the abrasive particles by direct imaging.
The digital hologram technology is a three-dimensional measurement technology, and can conveniently record and store holograms by adopting digital recording and digital reconstruction. The measurement of the particle field by the digital holographic technology is to measure each particle in the particle field, and the motion information, the geometric information and the position information of each particle can be obtained.
Therefore, how to solve the problems that the detection means of the lubricating oil wear particles cannot achieve both detection sensitivity (small particle size particles) and particle morphology and type (ferromagnetism and non-ferromagnetism) is a research hotspot in the prior art.
Disclosure of Invention
The invention aims to provide an oil abrasive particle detection method and device based on microscopic holography and magnetic field regulation, which can realize simultaneous online measurement of multiple parameters of lubricating oil abrasion particles and effectively distinguish and identify ferromagnetic particles from non-ferromagnetic particles.
The invention provides the following technical scheme:
an oil abrasive particle detection method based on microscopic holography and magnetic field regulation, which comprises the following steps:
(1) The oil to be measured is divided into a ferromagnetic particle flow and a non-ferromagnetic particle flow under the action of a magnetic field and then enters a measuring area;
(2) After being shaped by an optical element, laser beams emitted by a laser source are incident into a measuring area and respectively transmitted through a ferromagnetic particle flow and a non-ferromagnetic particle flow, scattered light of the ferromagnetic particles and the non-ferromagnetic particles is used as object light waves to interfere with unscattered laser to form holographic fringes, and the holographic fringes are recorded as particle holograms;
(3) Carrying out three-dimensional reconstruction, identification and positioning on the particle hologram to obtain three-dimensional position, particle size, morphology and concentration information of particles;
(4) And (3) judging a runner where the abrasive particles in the oil to be detected are positioned according to the z-axis position information in the three-dimensional position of the particles obtained in the step (3), and classifying ferromagnetic particles and non-ferromagnetic particles.
The invention makes ferromagnetic particles in the lubricating oil generate certain displacement through magnetic field adjustment, so that the spatial position of the ferromagnetic particles in the lubricating oil is different from the spatial position of the non-ferromagnetic particles. Meanwhile, as the digital holographic technology is a three-dimensional measurement technology, the geometric information and the position information of each particle in the particle field can be recorded. Finally, the ferromagnetic particles and the non-ferromagnetic particles can be distinguished according to the position information of the particles, and the number, the particle size and other important parameters of the ferromagnetic particles and the non-ferromagnetic particles are counted respectively. By combining the microfluidic technology, the online monitoring of multiple parameters such as particle size, concentration, morphology, type and the like of the lubricating oil wear particles can be realized, and the method has the unique advantage.
Further, in the step (2), the laser beam is shaped by an optical element to be a plane wave or a spherical wave; the holographic fringes contain the three-dimensional position and geometric information of the particles.
Further, in step (3), the reconstruction method may be a wavelet reconstruction, an angular spectrum reconstruction, or a fresnel reconstruction. The particle identification method is an adaptive thresholding method.
The invention also provides an oil abrasive particle detection device based on microscopic hologram and magnetic field regulation, which comprises:
the oil sampling unit is used for collecting oil to be detected and sending the oil to be detected into the microfluidic component;
the microfluidic component comprises a microfluidic device and a magnet, wherein oil to be detected is divided into a ferromagnetic particle flow and a non-ferromagnetic particle flow under the action of the magnet and then enters a ferromagnetic particle flow channel and a non-ferromagnetic particle flow channel in the microfluidic device respectively and flows through a measuring area;
the laser unit comprises a laser light source and an optical element, wherein a laser beam emitted by the laser light source is shaped by the optical element and then is incident into the measuring area, the laser beam is respectively transmitted through a ferromagnetic particle flow and a non-ferromagnetic particle flow, and scattered light of the ferromagnetic particles and the non-ferromagnetic particles is used as object light waves to interfere with unscattered laser to form holographic fringes;
an imaging unit for recording the holographic fringes as a particle hologram;
the signal processing unit is used for carrying out three-dimensional reconstruction, identification and positioning on the particle hologram to obtain three-dimensional position, particle size, morphology and concentration information of particles; and judging the flow channel where the abrasive particles in the oil to be detected are positioned according to the z-axis position information in the three-dimensional position, and classifying the ferromagnetic particles and the non-ferromagnetic particles.
Further, the oil liquid sampling unit comprises a peristaltic pump, a valve and a pipeline.
Further, the magnet is arranged at the inlet of the microfluidic device, the ferromagnetic particle flow channel and the non-ferromagnetic particle flow channel in the microfluidic device are adjacently arranged, the joint of the two flow channels shares an optical window, and the other side of the two flow channels is respectively provided with an optical window which is respectively used as an incident port and an emergent port of the laser beam.
The magnetic field generated by the magnet enables the movement direction of ferromagnetic particles in oil to change and then enter the ferromagnetic particle flow channel, and non-ferromagnetic particles move along the original path and enter the non-ferromagnetic particle flow channel. Wherein the strength of the magnetic field is adjustable.
Further, the laser light source is a visible light source with the wavelength ranging from 400nm to 700nm, and is a laser or a laser diode.
Further, the optical element is a filtering beam expanding and collimating system, and the filtering beam expanding and collimating system comprises a microscope objective, an optical pinhole and a collimating lens.
Further, the imaging unit comprises a camera and a lens, wherein the camera is an area-array camera, and the lens is a micro-lens with a certain imaging magnification.
Further, in the signal processing unit, the reconstruction method is wavelet reconstruction, angular spectrum reconstruction or fresnel reconstruction, and the particle identification method is a self-adaptive threshold method.
Compared with the prior art, the oil abrasive particle detection method and device based on microscopic hologram and magnetic field regulation solve the problem that the detection sensitivity (small particle size particles) and particle morphology and types (ferromagnetism and non-ferromagnetism) cannot be considered in the existing main lubricating oil abrasive particle detection means, namely the method and device can realize simultaneous online measurement of multiple parameters such as the particle size, concentration and morphology of lubricating oil abrasive particles, and the particle size measurement range is large (several micrometers to hundreds of micrometers), and can distinguish and identify ferromagnetic particles and non-ferromagnetic particles; the invention uses continuous laser, micro-fluidic device and common industrial camera, with low cost, simple structure and easy realization.
Drawings
FIG. 1 is a schematic diagram of a device for detecting oil wear particles according to the present invention;
the device comprises a continuous light source 1, a filtering beam-expanding collimation system 2, parallel light 3, parallel light 4, a measurement area 5, a camera 6, a microfluidic device 7, a magnet 8, a peristaltic pump 9, a lubricating oil tank 10, a ferromagnetic particle flow 11 and a non-ferromagnetic particle flow.
FIG. 2 is a hologram of lubricant abrasive particles;
FIG. 3 is a reconstructed image of lubricant abrasive particles;
fig. 4 is a three-dimensional distribution of lubricant abrasive particles.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Examples
As shown in fig. 1, the oil abrasive particle detection device adopting the combination of the microfluidic technology and the digital holographic technology comprises: holographic light path subassembly, micro-fluidic component, lubricating oil sample and return oil subassembly.
The oil sampling unit (or called as lubricating oil sampling and oil returning assembly) collects lubricating oil to be detected and sends the lubricating oil to the microfluidic assembly, and the microfluidic assembly comprises a lubricating oil tank 9 (or a lubricating oil sampling port), a peristaltic pump 8 and an oil pipeline. Wherein the wear particles/abrasive particles in the lubricating oil comprise ferromagnetic particles 10 and non-ferromagnetic particles 11.
The microfluidic component comprises a microfluidic device 6 and a magnet 7, and lubricating oil to be detected is divided into a ferromagnetic particle flow and a non-ferromagnetic particle flow under the action of the magnet 7 and then respectively enters a ferromagnetic particle flow channel and a non-ferromagnetic particle flow channel in the microfluidic device and flows through the measuring area 4.
Specifically, the magnet 7 is disposed at the inlet of the microfluidic device 6, the ferromagnetic particle flow channel and the non-ferromagnetic particle flow channel in the microfluidic device 6 are disposed adjacently, the connection parts thereof share one optical window, and the other side is respectively provided with one optical window which is respectively used as an incident port and an emergent port of the laser beam.
The laser unit comprises a laser light source and an optical element, wherein a laser beam emitted by the laser light source is shaped by the optical element and then is incident into the measuring area 4, the laser beam is respectively transmitted through the ferromagnetic particle flow and the non-ferromagnetic particle flow, and scattered light of the ferromagnetic particles and the non-ferromagnetic particles is used as object light waves to interfere with unscattered laser to form holographic fringes.
And an imaging unit for recording the holographic fringes as a particle hologram.
The laser unit and the imaging unit form a holographic light path component, and the holographic light path component comprises a continuous laser 1, a filtering beam-expanding and collimating system 2, a lens and a camera 5, wherein the filtering beam-expanding and collimating system comprises a microscope objective lens, an optical pinhole and a collimating lens.
The signal processing unit is used for carrying out three-dimensional reconstruction, identification and positioning on the particle hologram to obtain three-dimensional position, particle size, morphology and concentration information of particles; and judging the flow channel where the abrasive particles in the oil to be detected are positioned according to the z-axis position information in the three-dimensional position, and classifying the ferromagnetic particles and the non-ferromagnetic particles.
The work flow of the oil abrasive particle detection device provided by the embodiment is as follows: the lubricating oil carries the wear particles which slowly enter the microfluidic device 6 under the action of the peristaltic pump 8. The magnet 7 at the front inlet of the microfluidic device 6 applies a magnetic field with adjustable intensity and direction to enable the ferromagnetic particles 10 to generate displacement deviation, and the non-ferromagnetic particles 11 are separated in the z-axis direction and respectively enter the ferromagnetic particle flow channel and the non-ferromagnetic particle flow channel in the microfluidic device and flow downwards together and flow through the measuring area. Wherein the left side of the flow channel of ferromagnetic particles in the lubricating oil flowing through the measuring area 4 concentrates the ferromagnetic particles 10, while the right side of the flow channel of non-ferromagnetic particles concentrates the non-ferromagnetic particles 11 which are not horizontally displaced.
At the same time, the light beam emitted by the continuous laser 1 passes through the filter beam expansion collimation system 2 to form parallel light 3, and the parallel light 3 irradiates particles in the measurement area 4. The parallel light beams blocked by the lubricating oil wear particles interact with the particles to form object light waves in holographic imaging; light that does not interact with the particles passes directly through the measurement area as reference light waves in holographic imaging. The object light wave and the reference light wave interfere with each other on the target surface of the camera 5 and form a hologram, as shown in fig. 2. The holographic image is transmitted to an external computer for processing through a data transmission cable, the three-dimensional reconstruction is carried out on the holographic image by utilizing a wavelet method, the reconstructed image shown in the figure 3 is obtained after the depth of field is expanded, the particles in the reconstructed image are identified by adopting a self-adaptive threshold value, the particles are positioned, the three-dimensional position is obtained, and the three-dimensional spatial distribution of the abrasive particles is shown in the figure 4. The particle size is obtained according to the pixel area occupied by the particle image, and the concentration is obtained by the number of particles in unit volume. Finally, the information of the positions, the particle sizes, the concentrations, the morphologies and the like of the abrasion particles are obtained, and the measurement process is completed.
In this embodiment, during the reconstruction of the hologram, the three-dimensional position (x n ,y n ,z n ). The micro-fluidic device 6 is adopted in the front to enable the ferromagnetic particles 10 and the non-ferromagnetic particles 11 to generate a certain displacement difference in the horizontal position in a magnetic field regulation mode, namely, after the hologram is reconstructed, the ferromagnetic particles 10 and the non-ferromagnetic particles 11 also generate a certain difference in the numerical value of the z-axis coordinate. Accordingly, the flow channel where each particle is located is judged, the distinguishing and identification of the ferromagnetic particles 10 and the non-ferromagnetic particles 11 can be realized, and finally, the information such as the particle size, the morphology, the concentration and the like of the ferromagnetic particles are respectively and statistically analyzed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The oil abrasive particle detection method based on microscopic holography and magnetic field regulation is characterized by comprising the following steps of:
(1) The oil to be measured is divided into a ferromagnetic particle flow and a non-ferromagnetic particle flow under the action of a magnetic field and then enters a measuring area;
(2) After being shaped by an optical element, laser beams emitted by a laser source are incident into a measuring area and respectively transmitted through a ferromagnetic particle flow and a non-ferromagnetic particle flow, scattered light of the ferromagnetic particles and the non-ferromagnetic particles is used as object light waves to interfere with unscattered laser to form holographic fringes, and the holographic fringes are recorded as particle holograms;
(3) Carrying out three-dimensional reconstruction, identification and positioning on the particle hologram to obtain three-dimensional position, particle size, morphology and concentration information of particles;
(4) And (3) judging a runner where the abrasive particles in the oil to be detected are positioned according to the z-axis position information in the three-dimensional position of the particles obtained in the step (3), and classifying ferromagnetic particles and non-ferromagnetic particles.
2. The method for detecting oil abrasive particles based on microscopic holography and magnetic field control according to claim 1, wherein in the step (2), the laser beam is shaped into plane waves or spherical waves by an optical element; the holographic fringes contain the three-dimensional position and geometric information of the particles.
3. The method for detecting oil abrasive particles based on microscopic holography and magnetic field control according to claim 1, wherein in the step (3), the reconstruction method is wavelet reconstruction, angular spectrum reconstruction or fresnel reconstruction.
4. Oil abrasive particle detection device based on microscopic hologram and magnetic field regulation and control, a serial communication port, oil abrasive particle detection device include:
the oil sampling unit is used for collecting oil to be detected and sending the oil to be detected into the microfluidic component;
the microfluidic component comprises a microfluidic device and a magnet, wherein oil to be detected is divided into a ferromagnetic particle flow and a non-ferromagnetic particle flow under the action of the magnet and then enters a ferromagnetic particle flow channel and a non-ferromagnetic particle flow channel in the microfluidic device respectively and flows through a measuring area;
the laser unit comprises a laser light source and an optical element, wherein a laser beam emitted by the laser light source is shaped by the optical element and then is incident into the measuring area, the laser beam is respectively transmitted through a ferromagnetic particle flow and a non-ferromagnetic particle flow, and scattered light of the ferromagnetic particles and the non-ferromagnetic particles is used as object light waves to interfere with unscattered laser to form holographic fringes;
an imaging unit for recording the holographic fringes as a particle hologram;
the signal processing unit is used for carrying out three-dimensional reconstruction, identification and positioning on the particle hologram to obtain three-dimensional position, particle size, morphology and concentration information of particles; and judging the flow channel where the abrasive particles in the oil to be detected are positioned according to the z-axis position information in the three-dimensional position, and classifying the ferromagnetic particles and the non-ferromagnetic particles.
5. The oil abrasive particle detection device based on microscopic holography and magnetic field regulation according to claim 4, wherein the oil sampling unit comprises a peristaltic pump, a valve and a pipeline.
6. The oil abrasive particle detection device based on microscopic holography and magnetic field regulation and control according to claim 4, wherein the magnet is arranged at an inlet of the microfluidic device, a ferromagnetic particle runner and a non-ferromagnetic particle runner in the microfluidic device are adjacently arranged, an optical window is shared at a joint of the two runners, and an optical window is respectively arranged at the other side of the two runners and is respectively used as an incident port and an emergent port of a laser beam.
7. The oil abrasive particle detection device based on microscopic hologram and magnetic field regulation as claimed in claim 4, wherein the laser light source is a visible light source with a wavelength in a range of 400nm to 700nm, and is a laser or a laser diode.
8. The oil abrasive particle detection device based on microscopic holography and magnetic field regulation and control according to claim 4, wherein the optical element is a filtering beam expansion and collimation system, and the filtering beam expansion and collimation system comprises a microscope objective lens, an optical pinhole and a collimation lens.
9. The oil abrasive particle detection device based on microscopic holography and magnetic field regulation and control according to claim 4, wherein the imaging unit comprises a camera and a lens, the camera is an area array camera, and the lens is a microscopic lens.
10. The oil abrasive particle detection device based on microscopic holography and magnetic field regulation and control according to claim 4, wherein in the signal processing unit, the reconstruction method is wavelet reconstruction, angular spectrum reconstruction or Fresnel reconstruction, and the particle identification method is an adaptive threshold method.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311032687.2A CN117054296A (en) | 2023-08-16 | 2023-08-16 | Oil abrasive particle detection method and device based on microscopic hologram and magnetic field regulation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311032687.2A CN117054296A (en) | 2023-08-16 | 2023-08-16 | Oil abrasive particle detection method and device based on microscopic hologram and magnetic field regulation |
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| CN202311032687.2A Pending CN117054296A (en) | 2023-08-16 | 2023-08-16 | Oil abrasive particle detection method and device based on microscopic hologram and magnetic field regulation |
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