CN111982903B - Device and method for online monitoring of lubricating oil moisture based on image distortion - Google Patents
Device and method for online monitoring of lubricating oil moisture based on image distortion Download PDFInfo
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- CN111982903B CN111982903B CN202010834976.4A CN202010834976A CN111982903B CN 111982903 B CN111982903 B CN 111982903B CN 202010834976 A CN202010834976 A CN 202010834976A CN 111982903 B CN111982903 B CN 111982903B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to the technical field of oil on-line monitoring, in particular to an on-line monitoring device and method for lubricating oil moisture based on image distortion, comprising the following steps: the micro-fluidic device comprises a light source mechanism, a micro-channel mechanism, an optical imaging mechanism, a control analysis system and an outer shell, wherein the outer shell comprises a box body and a box cover, and a micro-fluidic channel inlet and a micro-fluidic channel outlet are formed in the box body; the light source mechanism and the micro-channel mechanism are arranged on the box body, the optical imaging mechanism and the control analysis system are arranged on the box cover, a round hole is formed in the box cover, a threaded hole is formed in the wall of the box body, corresponding to the round hole of the box cover, of the box body, and a screw is inserted into the threaded hole of the box body through the round hole of the box cover to fix the box body and the box cover; the light source mechanism, the micro-channel mechanism and the optical imaging mechanism are overlapped with the central shaft of the outer shell. The invention introduces the optical principle, has small volume, compact mechanism and low cost, extracts optical information from lubricating oil, and is easy to realize on-line real-time monitoring of the moisture content of the lubricating oil.
Description
Technical Field
The invention relates to the technical field of oil online monitoring, in particular to an online monitoring device and an online monitoring method for lubricating oil moisture based on image distortion.
Background
The lubricating oil is very important for mechanical equipment, and various changes and parameters of the equipment during operation can be hidden in the information, so that an oil monitoring technology is required to measure and analyze the lubricating oil to obtain various parameter changes of the lubricating oil, such as moisture content and the like, and further the lubrication state of the lubricating oil of the equipment can be judged. The lubricating oil pollution is one of the main reasons of mechanical equipment failure, the water pollution is one of the main reasons of the lubricating oil pollution, and in the normal operation of the machine equipment, the analysis of the water content of the lubricating oil can make early detection and early warning on the machine wear, so that the working condition of the equipment is improved, and the method has important significance for prolonging the working life of the equipment.
The traditional lubricating oil moisture measuring device is based on the principle that the electrical characteristics of the sensor device such as resistivity, capacitance, frequency and the like are directly measured according to the change of the lubricating oil moisture content. Although the measurement accuracy is high, the cost is high, the sensor is large in size, the application range is limited, and accurate information for measuring the degradation and the health condition of the lubricating oil cannot be provided. Patent 201010295276.9 mentions a capacitance method based on dielectric constant water sensor probe and an on-line monitoring method, but is only suitable for the condition of higher water content of lubricating oil, and cannot accurately measure trace water content. Patent 201210084173.7 proposes an online lubricating oil trace moisture sensor based on conductivity measurement, which can measure the minimum water content of 0.1% in lubricating oil and detect whether free water exists in the lubricating oil, but the sensor core probe is directly contacted with the environment, so that the damage is very easy to occur.
Disclosure of Invention
In order to solve the problems, the invention provides the online monitoring device for the lubricating oil moisture based on the image distortion, which has reasonable structural design, low cost and small volume, and the online monitoring method for the lubricating oil moisture based on the image distortion, can monitor the content of the lubricating oil moisture on line in real time and has high measurement precision.
An image distortion-based lubricating oil moisture on-line monitoring device, comprising: the micro-fluidic system comprises a light source mechanism 1, a micro-channel mechanism 2, an optical imaging mechanism 3, a control analysis system 4, an outer shell 5 and screws, wherein the outer shell 5 comprises a box body 5-1 and a box cover 5-2, a micro-fluidic channel inlet and outlet are arranged at the central position on the box body 5-1, a first groove is arranged at the central position on the left side of the box body 5-1, and the first groove is positioned between the micro-fluidic channel inlet and outlet; a boss is arranged on the right side of the case cover 5-2, and a second groove is arranged on the boss; the light source mechanism 1 and the micro-channel mechanism 2 are arranged in the box body 5-1, the optical imaging mechanism 3 and the control analysis system 4 are arranged on the box cover 5-2, a round hole is formed in the box cover 5-2, a threaded hole is formed in the shell wall of the box body 5-1, which corresponds to the round hole of the box cover 5-2, and a screw is inserted into the threaded hole of the box body 5-1 through the round hole of the box cover 5-2 to fix the box body 5-1 and the box cover 5-2; the light source mechanism 1, the micro-channel mechanism 2, the optical imaging mechanism 3 and the central axis of the outer shell 5 are overlapped, the micro-fluid mechanism 2 is fixed on the box 5-1 through screws, a certain gap is reserved between the light source mechanism 1 and the micro-channel mechanism 2, and the light source mechanism 1 and the central axis of the micro-channel mechanism 2 are coaxial.
Further, the light source mechanism 1 comprises a light source 1-1 and an optical lens 1-2, wherein the light source 1-1 is arranged on the right side of the optical lens 1-2, and the light source 1-1 and the center of the optical lens 1-2 are positioned on the same horizontal line.
Further, the specific connection manner of the light source mechanism 1 and the micro flow channel mechanism 2 includes: the light source 1-1 of the light source mechanism 1 is stuck in a first groove of the box body 5-1, the optical lens 1-2 of the light source mechanism 1 is inlaid at the outer end part of the first groove, and a gap is reserved between the light source 1-1 and the optical lens 1-2.
Further, the micro flow channel mechanism 2 includes a detecting object 2-2 with a periodic structure, a micro flow channel 2-1, an inlet channel and an outlet channel, the detecting object 2-2 with a periodic structure is fixedly arranged at the left side of the micro flow channel 2-1, and the inlet channel and the outlet channel are positioned at two sides of the micro flow channel 2-1.
Further, the optical imaging mechanism 3 comprises a lens 3-1, a lens sleeve 3-2, a focusing screw barrel 3-3 and a photoelectric imaging device 3-4, the lens 3-1 in the optical imaging mechanism 3 is inlaid at the front end of the lens sleeve 3-2, external threads are arranged on the outer side of the lens sleeve 3-2 and are in threaded connection with internal threads in the focusing screw barrel 3-3, the object distance of an imaging system can be adjusted by rotating the lens sleeve 3-2, focusing imaging of the lens and magnification change are facilitated, and the focusing screw barrel 3-3 is fixed on a box cover 5-2 of the device by using screws.
Further, the photoelectric imaging device 3-4 in the optical imaging mechanism 3 is adhered to the middle part of the box cover 5-2, the photoelectric imaging device 3-4 is placed in the focusing screw barrel 3-3, and the central axis of the photoelectric imaging device 3-4 is coaxial with the light source 1-1.
Further, the photo imaging devices 3-4 use CCD image sensors.
Further, the control analysis system 4 is embedded in a second groove of the boss on the right side of the box cover 5-2, and the control analysis system 4 is connected with the photoelectric imaging device 3-4.
An online monitoring method of lubricating oil moisture based on image distortion comprises the following steps:
s1, acquiring an original object image: introducing fresh lubricating oil into the micro-channel 2-1, starting a light source 1-1 in the light source mechanism 1, and obtaining an original object image, namely an optical appearance image of a fresh lubricating oil-target object combination, on a photoelectric imaging device 3-4 in the optical imaging mechanism 3 by passing through fresh lubricating oil medium in the micro-channel mechanism 2 and a detection object 2-2 with a periodic structure;
s2, acquiring an image of a deformed object: introducing water-contaminated lubricating oil into the micro-channel 2-1, starting a light source 1-1 in the light source mechanism 1, enabling light to pass through a water-contaminated lubricating oil medium in the micro-channel mechanism 2 and a detection object 2-2 with a periodic structure, obtaining a deformed object image, namely an optical appearance image of a water-contaminated lubricating oil-target object combination, on a photoelectric imaging device 3-4 in the optical imaging mechanism 3, and transmitting optical information about the pollution condition of the lubricating agent;
s3, performing initial optical image processing on the original object image in the control analysis system 4 to obtain a color section of the original object image, and performing deformation optical image processing on the deformed object image in the control analysis system 4 to obtain a color section of the deformed object image;
and S4, defining shape parameters representing the object in the color section, comparing the color section of the original object image with the shape parameters of the deformed object image, carrying out reliable quantitative analysis on moisture in the lubricating oil, and evaluating the lubrication condition of the lubricating oil.
Further, performing optical image processing on the image in the control analysis system 4 includes: and extracting image cross sections, performing color normalization processing on each image cross section, and mapping pixel color proportions and pixel positions to form color cross sections.
The invention has the beneficial effects that:
1. the product of the invention has low manufacturing cost and small occupied space, and is easier to apply the online moisture monitoring of lubricating oil;
2. the product structure of the invention realizes the moisture monitoring of lubricating oil based on the optical principle, and is safer and wider in application range than the existing moisture monitoring equipment;
3. the product of the invention introduces a detection object with a known periodic structure behind the optical medium (lubricating oil), and the obtained image contains a synergistic effect of the combined optical appearance of the lubricating oil-target, wherein the known periodic structure of the target is distorted by the lubricating oil. The introduction of objects of known periodic structure greatly simplifies the monitoring of the condition of the medium by analysis of the lubricating oil-object combination image. Therefore, by measuring the statistical features of the captured image and comparing with the original object image, the differences in these features are representative of the performance of the lubricating oil, and analysis can be performed based on the change in the state of the lubricating oil, thereby accurately discriminating the presence of contaminants.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of an exploded structure of an online monitoring device for lubricating oil moisture based on image distortion in an embodiment of the invention;
FIG. 2 is a schematic diagram of the overall structure of an online monitoring device for lubricating oil moisture based on image distortion in an embodiment of the invention;
FIG. 3 is a three-dimensional view of a microfluidic channel 2-1 according to an embodiment of the present invention;
FIG. 4 is a flowchart of an online monitoring method of lubricating oil moisture based on image distortion in an embodiment of the invention;
reference numerals: 1 is a light source mechanism, 2 is a micro-flow channel mechanism, 3 is an optical imaging mechanism, 4 is a control analysis system, 5 is an outer shell, 1-1 is a light source, 1-2 is an optical lens, 2-1 is a micro-fluid channel, 2-2 is a detection object with a periodic structure, 3-1 is a lens, 3-2 is a lens sleeve, 3-3 is a focusing screw barrel, 3-4 is a photoelectric imaging device, 5-1 is a box body, and 5-2 is a box cover.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-2, an online monitoring device for moisture content of lubricating oil based on image distortion includes: a light source mechanism 1, a micro flow channel mechanism 2, an optical imaging mechanism 3, a control analysis system 4, an outer shell 5 and screws.
The outer shell 5 is a square cavity and comprises a box 5-1 and a box cover 5-2, the box 5-1 is of a square edge-missing cavity structure, a plurality of threaded holes are formed in the left side wall edge of the box 5-1, and the threaded holes are used for inserting screws to fix the box 5-1 and the box cover 5-2; the central position of the box body 5-1 is provided with a microfluidic channel inlet and outlet, the central position of the left side of the box body 5-1 is provided with a first groove, the first groove is positioned between the microfluidic channel inlet and outlet, and the first groove is used for placing the light source mechanism 1. The box cover 5-2 is square, a square boss is arranged on the right side of the box cover 5-2, the boss size of the box cover 5-2 is matched with that of the box body 5-1, and a second groove is formed in the square boss and used for placing the control analysis system 4; the box cover 5-2 is provided with a round hole at a position corresponding to the threaded hole of the box body 5-1. Screw is inserted into the threaded hole of the box body 5-1 through the round hole of the box cover 5-2 to fix the box body 5-1 and the box cover 5-2 in a threaded manner, after the box body 5-1 and the box cover 5-2 are fixed, the micro-channel mechanism 2 and the optical imaging mechanism 3 are opposite, a certain gap is reserved between the light source mechanism 1 and the micro-channel mechanism 2, and the central shaft of the light source mechanism 1 is coaxial with the central shaft of the micro-channel mechanism 2.
In a preferred embodiment, 4 threaded holes are provided, and the 4 threaded holes are respectively provided at four right-angle wall edges of the square cavity.
In a preferred embodiment, the threaded holes are equally spaced along the square cavity wall of the housing 5-1.
The inlet and outlet of the micro-fluid channel arranged in the center of the box body 5-1 are two circular through holes, the two circular through holes are respectively communicated with the inlet channel opening and the outlet channel opening of the micro-fluid channel mechanism 2, and lubricating oil flows in from the inlet of the micro-fluid channel and flows out from the outlet of the micro-fluid channel.
In an alternative embodiment, the outer housing 5 is a cylindrical cavity, the box 5-1 is in the shape of a hollow cylinder with a top being cut, and a plurality of threaded holes are formed in the circular wall edge of the box 5-1. The case cover 5-2 is in a circular shape, a circular boss is arranged on the right side of the case cover 5-2, the boss of the case cover 5-2 is matched with the case body 5-1, and a circular hole is formed in the position, corresponding to a threaded hole of the case body 5-1, of the case cover 5-2.
In an alternative embodiment, the outer housing 5 is a rectangular cavity, the box 5-1 is a rectangular shape, and the rectangular wall edge of the box 5-1 is provided with a plurality of threaded holes. The box cover 5-2 is rectangular, a square boss is arranged on the right side of the box cover 5-2, the boss of the box cover 5-2 is matched with the box body 5-1, and round holes are formed in the corresponding positions of the box cover 5-2 and the threaded holes of the box body 5-1.
The light source mechanism 1 and the micro-channel mechanism 2 are arranged on the left side of the box body 5-1, the optical imaging mechanism 3 and the control analysis system 4 are arranged on the right side of the box cover 5-2, and the light source mechanism 1, the micro-channel mechanism 2 and the optical imaging mechanism 3 are overlapped with the central shaft of the outer shell body 5.
The light source mechanism 1 comprises a light source 1-1 and an optical lens 1-2, wherein the light source 1-1 is arranged on the right side of the optical lens 1-2, and the light source 1-1 and the center of the optical lens 1-2 are positioned on the same horizontal line. In a preferred embodiment, the light source 1-1 is a visible light source, preferably an LED light source, and the visible light band is selected.
The micro-channel mechanism 2 comprises a detection object 2-2 with a periodic structure, a micro-fluid channel 2-1, an inlet channel port and an outlet channel port, wherein the detection object 2-2 with the periodic structure is fixedly arranged on the left side of the micro-fluid channel 2-1, and the inlet channel port and the outlet channel port are positioned on two sides of the micro-fluid channel 2-1. The detection object 2-2 having a known periodic structure is disposed opposite the optical imaging mechanism 3, specifically, the detection object 2-2 having a periodic structure is embedded in the left side of the microfluidic channel 2-1 of the microfluidic channel mechanism 2, and the detection object 2-2 having a known periodic structure is used in order to introduce a periodic texture when acquiring an optical image. When light irradiates an object with a periodic texture structure through the lubricating oil film, the optical patterns refracted by oil with different water pollution concentrations are distinguished due to the optical image distortion principle. The periodic structure of the object is detected, so that an optical spectrum can be better acquired, and the spectrum difference of oil with different water pollution concentrations can be better detected. In one period, the optical image distortion principle is utilized to obtain the shape information of the periodic detection object 2-2 arranged behind the lubricating oil film, and the content of water pollution and the lubrication condition are estimated by comparing the shape parameter changes of the periodic detection objects of fresh lubricating oil and water pollution lubricating oil.
In a preferred embodiment, the periodic structure of the detecting object 2-2 has a periodic texture, which may be a grid texture or a stripe texture, and preferably, the periodic structure of the detecting object 2-2 is formed by weaving a metal grid wire cloth with stainless steel, and the grid is any one of square, rectangle or circle.
As shown in fig. 3, the microfluidic channel 2-1 in the micro flow path mechanism 2 is a square micro cavity pipe for circulating a small amount of hydraulic oil, so as to form a non-uniform liquid medium (lubricating oil) film, and the microfluidic channel 2-1 is disposed between the light source 1-1 and the optical imaging mechanism 3. The inlet channel opening and the outlet channel opening are respectively arranged at two sides of the cavity pipeline and are communicated with the cavity pipeline, and lubricating oil flows in from the inlet channel opening and flows out from the outlet channel opening.
The specific connection mode of the light source mechanism 1 and the micro-channel mechanism 2 comprises: the light source 1-1 of the light source mechanism 1 is stuck in a first groove reserved in the box body 5-1, the joint surface of the light source 1-1 is uniformly coated with heat conduction silica gel for heat dissipation, the optical lens 1-2 of the light source mechanism 1 is inlaid at the outer end part of the first groove, a gap is reserved between the light source 1-1 and the optical lens 1-2, the micro-fluid mechanism 2 is fixed on a connecting seat of the box body 5-1 through a screw, the light source mechanism 1 and the micro-channel mechanism 2 are reserved with a gap, and the light source mechanism 1 and the central shaft of the micro-channel mechanism 2 are coaxial.
The optical imaging mechanism 3 comprises a lens 3-1, a lens sleeve 3-2, a focusing screw barrel 3-3 and a photoelectric imaging device 3-4, wherein the lens 3-1 in the optical imaging mechanism 3 is inlaid at the front end of the lens sleeve 3-2, external threads are arranged on the outer side of the lens sleeve 3-2 and are in threaded connection with internal threads in the focusing screw barrel 3-3, the object distance of an imaging system can be adjusted by rotating the lens sleeve 3-2, focusing imaging of the lens and magnification change are facilitated, and the focusing screw barrel 3-3 is fixed on a box cover 5-2 of the device by using screws.
The photoelectric imaging device 3-4 in the optical imaging mechanism 3 is adhered to the center of the box cover 5-2, and the photoelectric imaging device 3-4 is placed in the focusing screw barrel 3-3, and the center axis of the photoelectric imaging device 3-4 is coaxial with the center of the light source 1-1.
In a preferred embodiment, the optoelectronic imaging device 3-4 uses a CCD image sensor, which occupies a small space and is easier to apply on-line moisture monitoring of lubricating oil.
In a preferred embodiment, a partition plate is arranged between the light source mechanism 1 and the micro flow channel mechanism 2, through holes corresponding to the size and the number of people of the micro flow channel 2-1 are arranged on the partition plate, and the micro flow channel 2-1 passes through the through holes of the partition plate and enters a micro flow channel inlet and outlet arranged in the center of the box body 5-1.
The control analysis system 4 is adhered to the case cover 5-2, and the control analysis system 4 is electrically connected to the optoelectronic imaging device 3-4 for analyzing the optical appearance image of the lubricating oil-target object combination obtained by the optical imaging mechanism 3.
As shown in fig. 4, an online monitoring method for moisture content of lubricating oil based on image distortion includes, but is not limited to, the following steps:
s1, acquiring an original object image: introducing fresh lubricating oil into the micro-channel 2-1, starting a light source 1-1 in the light source mechanism 1, and obtaining an original object image, namely an optical appearance image of a fresh lubricating oil-target object combination, on a photoelectric imaging device 3-4 in the optical imaging mechanism 3 by passing through fresh lubricating oil medium in the micro-channel mechanism 2 and a detection object 2-2 with a periodic structure;
s2, acquiring an image of a deformed object: introducing water-contaminated lubricating oil into the micro-channel 2-1, starting a light source 1-1 in the light source mechanism 1, enabling light to pass through a water-contaminated lubricating oil medium in the micro-channel mechanism 2 and a detection object 2-2 with a periodic structure, obtaining a deformed object image, namely an optical appearance image of a water-contaminated lubricating oil-target object combination, on a photoelectric imaging device 3-4 in the optical imaging mechanism 3, and transmitting optical information about the pollution condition of the lubricating agent;
s3, performing initial optical image processing on the original object image in the control analysis system 4 to obtain a color section of the original object image, and performing deformation optical image processing on the deformed object image in the control analysis system 4 to obtain a color section of the deformed object image;
further, performing optical image processing on the image includes: firstly, selecting two grid lines to respectively carry out transverse cutting treatment on an original object image and a deformed object image, and extracting an image cross section; then, each image cross section is subjected to color normalization processing, and the pixel color ratio (between 0 and 1) and the pixel position are mapped to form a color cross section.
S4, defining the shape parameters representing the object in the color section, and comparing the color section of the original object image with the shape parameters of the color section of the deformed object image. Several shape parameters are measured, such as object relative color, object width non-uniformity coefficient, etc. When the water concentration is gradually increased, the amplitude of the color section graph is obviously reduced, the relative color parameter of the object is linearly reduced, and the non-uniformity coefficient of the width of the object is gradually reduced. As the water concentration increases by 1% -10%, the shape parameter value of each concentration is measured to change. The water content in the lubricating oil can be evaluated by comparing the values of the shape parameters, so that the lubrication condition of the lubricating oil can be evaluated.
When introducing elements of various embodiments of the present application, the articles "a," "an," "the," and "said" are intended to mean that there are one or more of the elements. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.
In the description of the present invention, it should be understood that the terms "coaxial," "bottom," "left," "center," "middle," "other end," "upper," "one side," "right," "inner," "front," "both ends," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
It should be noted that, it will be understood by those skilled in the art that all or part of the above-mentioned method embodiments may be implemented by a computer program to instruct related hardware, where the program may be stored in a computer readable storage medium, and the program may include the above-mentioned method embodiments when executed. The storage medium may be a magnetic disk, an optical disk, a Read-0nly memory (rom), a random access memory (Random Access Memory, RAM), or the like.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points. The apparatus embodiments described above are merely illustrative, wherein the units and modules illustrated as separate components may or may not be physically separate. In addition, some or all of the units and modules can be selected according to actual needs to achieve the purpose of the embodiment scheme. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The foregoing is merely a specific implementation of the application and it should be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. An image distortion-based lubricating oil moisture on-line monitoring device, comprising: the micro-fluidic device is characterized in that the outer shell (5) comprises a box body (5-1) and a box cover (5-2), a micro-fluidic channel inlet and outlet are formed in the central position of the box body (5-1), a first groove is formed in the central position of the left side of the box body (5-1), and the first groove is located between the micro-fluidic channel inlet and outlet; a boss is arranged on the right side of the case cover (5-2), and a second groove is arranged on the boss; the light source mechanism (1) and the micro-channel mechanism (2) are arranged in the box body (5-1), the optical imaging mechanism (3) and the control analysis system (4) are arranged on the box cover (5-2), a round hole is formed in the box cover (5-2), a threaded hole is formed in the wall of the box body (5-1) corresponding to the round hole of the box cover (5-2), and a screw is inserted into the threaded hole of the box body (5-1) through the round hole of the box cover (5-2) to fix the box body (5-1) and the box cover (5-2); the light source mechanism (1), the micro-channel mechanism (2), the optical imaging mechanism (3) and the central shaft of the outer shell (5) are overlapped, the micro-channel mechanism (2) is fixed on the box (5-1) through screws, a gap is reserved between the light source mechanism (1) and the micro-channel mechanism (2), and the light source mechanism (1) is coaxial with the central shaft of the micro-channel mechanism (2);
the micro-channel mechanism (2) comprises a detection object (2-2) with a periodic structure, a micro-fluid channel (2-1), an inlet channel port and an outlet channel port, wherein the detection object (2-2) with the periodic structure is fixedly arranged on the left side of the micro-fluid channel (2-1), and the inlet channel port and the outlet channel port are positioned on two sides of the micro-fluid channel (2-1).
2. The lubricating oil moisture on-line monitoring device based on image distortion according to claim 1, wherein the light source mechanism (1) comprises a light source (1-1) and an optical lens (1-2), the light source (1-1) is arranged on the right side of the optical lens (1-2), and the center of the light source (1-1) and the center of the optical lens (1-2) are positioned on the same horizontal line.
3. The online monitoring device for lubricating oil moisture based on image distortion according to claim 2, wherein the specific connection mode of the light source mechanism (1) and the micro-channel mechanism (2) comprises: the light source (1-1) of the light source mechanism (1) is stuck in a first groove of the box body (5-1), the optical lens (1-2) of the light source mechanism (1) is inlaid at the outer end part of the first groove, and a gap is reserved between the light source (1-1) and the optical lens (1-2).
4. The on-line monitoring device for moisture of lubricating oil based on image distortion according to claim 1, wherein the optical imaging mechanism (3) comprises a lens (3-1), a lens sleeve (3-2), a focusing screw barrel (3-3) and a photoelectric imaging device (3-4), the lens (3-1) in the optical imaging mechanism (3) is inlaid at the front end of the lens sleeve (3-2), external threads are arranged on the outer side of the lens sleeve (3-2) and are in threaded connection with internal threads in the focusing screw barrel (3-3), the object distance of an imaging system can be adjusted by rotating the lens sleeve (3-2), focusing imaging of the lens and magnification changing are facilitated, and the focusing screw barrel (3-3) is fixed on a box cover (5-2) of the device by using screws.
5. The on-line monitoring device for lubricating oil moisture based on image distortion according to claim 4, wherein the photoelectric imaging device (3-4) in the optical imaging mechanism (3) is adhered to the middle part of the box cover (5-2), the photoelectric imaging device (3-4) is placed in the focusing screw barrel (3-3), and the central axis of the photoelectric imaging device (3-4) is coaxial with the light source (1-1).
6. An image distortion based on-line monitoring device for lubricating oil moisture according to claim 5, characterized in that the photo-electric imaging device (3-4) uses a CCD image sensor.
7. The on-line monitoring device for lubricating oil moisture based on image distortion according to claim 1, wherein the control analysis system (4) is embedded in a second groove of a boss on the right side of the box cover (5-2), and the control analysis system (4) is connected with the photoelectric imaging device (3-4).
8. An on-line monitoring method for lubricating oil moisture based on image distortion is characterized by comprising the following steps:
s1, acquiring an original object image: introducing fresh lubricating oil into the micro-fluid channel (2-1), starting a light source (1-1) in the light source mechanism (1), and obtaining an original object image, namely an optical appearance image of a fresh lubricating oil-target object combination, on a photoelectric imaging device (3-4) in the optical imaging mechanism (3) through fresh lubricating oil medium in the micro-fluid channel mechanism (2) and a detection object (2-2) with a periodic structure by light;
s2, acquiring an image of a deformed object: introducing water-contaminated lubricating oil into the micro-fluid channel (2-1), starting a light source (1-1) in the light source mechanism (1), enabling the light to pass through a water-contaminated lubricating oil medium in the micro-fluid channel mechanism (2) and a detection object (2-2) with a periodic structure, obtaining a deformed object image, namely an optical appearance image of a water-contaminated lubricating oil-target object combination, on a photoelectric imaging device (3-4) in the optical imaging mechanism (3), and transmitting optical information about the pollution condition of the lubricating agent;
s3, performing initial optical image processing on the original object image in the control analysis system (4) to obtain a color section of the original object image, and performing deformation optical image processing on the deformed object image in the control analysis system (4) to obtain a color section of the deformed object image;
and S4, defining shape parameters representing the object in the color section, comparing the color section of the original object image with the shape parameters of the deformed object image, carrying out reliable quantitative analysis on moisture in the lubricating oil, and evaluating the lubrication condition of the lubricating oil.
9. The method for online monitoring of lubricating oil moisture based on image distortion as claimed in claim 8, wherein the optical image processing of the image in the control analysis system (4) comprises: and extracting image cross sections, performing color normalization processing on each image cross section, and mapping pixel color proportions and pixel positions to form color cross sections.
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