CN111982903B - Device and method for online monitoring of lubricating oil moisture based on image distortion - Google Patents

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

A device and method for online monitoring of lubricating oil moisture based on image distortion

technical field

The invention relates to the technical field of online oil monitoring, in particular to an image distortion-based online monitoring device and method for lubricating oil moisture.

Background technique

Lubricating oil is very important to mechanical equipment. Various changes and parameters during equipment operation will contain information in it. Therefore, oil monitoring technology is needed to measure and analyze it to obtain various parameter changes of lubricating oil, such as moisture content, etc. , and then can judge the lubrication state of the equipment lubricating oil. Lubricating oil pollution is one of the important reasons for mechanical equipment failure, and water pollution is one of the main reasons for lubricating oil pollution. During the normal operation of machinery and equipment, analyzing the moisture content of lubricating oil can make early detection and early warning of machine wear , thereby improving the working conditions of the equipment, which is of great significance to prolonging the working life of the equipment.

The traditional lubricating oil moisture measurement device uses the measurement principle to directly measure the electrical characteristics of the sensor device, such as resistivity, capacitance, frequency, etc., which change with the change of the lubricating oil moisture content. Although the measurement accuracy is high, the cost is also high, and the sensors are often bulky and have limited application range, which cannot provide accurate information on the degradation and health status of lubricating oil. Patent 201010295276.9 mentions the moisture sensor probe and online monitoring method based on the capacitance method of the dielectric constant, but it is only suitable for the case of high moisture content in lubricating oil, and cannot accurately measure the trace moisture content. Patent 201210084173.7 proposes an online lubricating oil trace moisture sensor based on conductivity measurement, which can measure the minimum 0.1% water content in lubricating oil and detect whether there is free water in lubricating oil, but the core probe of the sensor is in direct contact with the environment. Very susceptible to damage.

Contents of the invention

In order to solve the above problems, the present invention provides a lubricating oil moisture online monitoring device based on image distortion and a lubricating oil moisture online monitoring method based on image distortion with reasonable structure design, low cost and small volume, which can monitor lubricating oil online in real time Moisture content, high measurement accuracy.

An online monitoring device for lubricating oil moisture based on image distortion, comprising: a light source mechanism 1, a micro-channel mechanism 2, an optical imaging mechanism 3, a control analysis system 4, an outer casing 5 and screws, and the outer casing 5 includes a box body 5 -1 and the box cover 5-2, the central position on the box body 5-1 is provided with a microfluidic channel inlet and outlet, and the left central position of the box body 5-1 is provided with a first groove, and the first groove Located between the inlet and outlet of the microfluidic channel; the right side of the box cover 5-2 is provided with a boss, and the boss is provided with a second groove; the light source mechanism 1 and the microfluidic 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, and the box cover 5-2 is provided with a round hole, and the box body 5-1 is connected with the box cover 5- 2 There is a threaded hole on the shell wall corresponding to the position of the round hole, insert the screw through the round hole of the box cover 5-2 into the threaded hole of the box body 5-1 to realize the fixing of the box body 5-1 and the box cover 5-2 ; The light source mechanism 1, the microchannel mechanism 2, the optical imaging mechanism 3 coincide with the central axis of the outer shell 5, the microfluid mechanism 2 is fixed on the box body 5-1 by screws, and the light source mechanism 1 A certain gap is reserved between the micro-channel mechanism 2, and the central axis of the light source mechanism 1 and the micro-channel mechanism 2 is coaxial.

Further, the light source mechanism 1 includes 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 light source 1-1 and the optical lens 1-2 centers are at the same level.

Further, the specific connection method between the light source mechanism 1 and the micro-channel mechanism 2 includes: the light source 1-1 of the light source mechanism 1 is pasted in the first groove of the box body 5-1, the optical lens of the light source mechanism 1 1-2 is embedded in the outer end of the first groove, and a gap is reserved between the light source 1-1 and the optical lens 1-2.

Further, the microfluidic channel mechanism 2 includes a detection object 2-2 with a periodic structure, a microfluidic channel 2-1, an inlet port and an outlet port, and the detection object 2-2 with a periodic structure is fixed on the On the left side of the microfluidic channel 2-1, the inlet port and the outlet port are located on both sides of the microfluidic channel 2-1.

Further, the optical imaging mechanism 3 includes a lens 3-1, a lens sleeve 3-2, a focusing screw barrel 3-3 and a photoelectric imaging device 3-4, and the lens 3-1 in the optical imaging mechanism 3 is embedded in the lens The front end of the sleeve 3-2, the outside of the lens sleeve 3-2 is provided with an external thread, which is threadedly connected with the internal thread in the focusing screw barrel 3-3, and the object distance of the imaging system can be adjusted by rotating the lens sleeve 3-2, which is convenient The lens focuses on imaging and changes the magnification, and the focusing screw barrel 3-3 is fixed on the case cover 5-2 of the device with screws.

Further, the photoelectric imaging device 3-4 in the optical imaging mechanism 3 is bonded to the middle part of the case cover 5-2, and the photoelectric imaging device 3-4 is placed in the focusing screw barrel 3-3, and the photoelectric imaging device 3-4 The central axis of is coaxial with the light source 1-1.

Further, the photoelectric imaging device 3-4 uses a CCD image sensor.

Further, the control analysis system 4 is embedded in the second groove of the right side of the case cover 5-2, and the control analysis system 4 is connected with the photoelectric imaging device 3-4.

A method for online monitoring of lubricating oil moisture based on image distortion, comprising the following steps:

S1. Collect the original object image: feed fresh lubricating oil into the micro-channel 2-1, turn on the light source 1-1 in the light source mechanism 1, and the light passes through the fresh lubricating oil medium in the micro-channel mechanism 2 and has a periodic structure The detection object 2-2, the original object image is obtained on the photoelectric imaging device 3-4 in the optical imaging mechanism 3, that is, the optical appearance image of the fresh lubricating oil-target object combination;

S2. Image collection of deformed objects: pass lubricating oil polluted by water into the micro-channel 2-1, turn on the light source 1-1 in the light source mechanism 1, and light passes through the lubricating oil medium polluted by water in the micro-channel mechanism 2 and the detection object 2-2 with a periodic structure, the image of the deformed object is obtained on the photoelectric imaging device 3-4 in the optical imaging mechanism 3, that is, the optical appearance image of the combination of lubricating oil-target object contaminated by water, and the information about the lubrication Optical information on agent contamination status;

S3. Perform initial optical image processing on the original object image in the control analysis system 4 to obtain a color cross section of the original object image, and perform deformed optical image processing on the deformed object image in the control analysis system 4 to obtain a color cross section of the deformed object image;

S4. Define the shape parameters representing the object in the color cross-section, compare the object shape parameters of the color cross-section of the original object image and the color cross-section of the deformed object image, carry out reliable quantitative analysis of the moisture in the lubricating oil, and check the lubricating conditions of the lubricating oil to evaluate.

Further, the optical image processing of the image in the control analysis system 4 includes: extracting image cross-sections, performing color normalization processing on each image cross-section, and mapping pixel color ratios and pixel positions to form color cross-sections.

Beneficial effects of the present invention:

1. The product of the present invention has low manufacturing cost, takes up little space, and is easier to apply online moisture monitoring of lubricating oil;

2. The product structure of the present invention realizes the moisture monitoring of lubricating oil based on the optical principle, which is safer and has a wider application range than the existing moisture monitoring equipment;

3. The product of the present invention introduces a detection object with a known periodic structure behind the optical medium (lubricating oil), and the obtained image contains the synergistic effect of the combined optical appearance of the lubricating oil-target object, wherein the known periodic structure of the target object is Lube twisted. The introduction of an object with a known periodic structure greatly simplifies the media condition monitoring through the analysis of the combined image of the lubricating oil-object. Therefore, by measuring the statistical features of the collected image and comparing it with the original object image, the difference in these features represents the performance of the lubricating oil, which can be analyzed according to the change of the lubricating oil state, so as to accurately identify the presence of pollutants.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of an exploded structure of an online monitoring device for lubricating oil moisture based on image distortion according to an embodiment of the present invention;

2 is a schematic diagram of the overall structure of an online monitoring device for lubricating oil moisture based on image distortion according to an embodiment of the present invention;

Fig. 3 is a three-dimensional view of a microfluidic channel 2-1 in an embodiment of the present invention;

4 is a flowchart of an online monitoring method for lubricating oil moisture based on image distortion according to an embodiment of the present invention;

Reference numerals: 1 is a light source mechanism, 2 is a microchannel 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 Microfluidic 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 Be casing, 5-2 are case cover.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 1-2, an online monitoring device for lubricating oil moisture based on image distortion includes: 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.

The outer casing 5 is a square cavity, including a box body 5-1 and a box cover 5-2. The box body 5-1 is a square cavity structure with missing edges, and the left side wall of the box body 5-1 is along the A plurality of threaded holes are arranged on the top, and the threaded holes are used to insert screws to fix the box body 5-1 and the box cover 5-2; the center position of the box body 5-1 is provided with a microfluidic channel inlet and outlet, and the box body 5-1 1 is provided with a first groove at the center of the left side, the first groove is located between the inlet and outlet of the microfluidic channel, and the first groove is used to place the light source mechanism 1 . Described case lid 5-2 is square shape, and the right side of case lid 5-2 is provided with square boss, and the boss size of case lid 5-2 is adapted to box body 5-1, and square boss is provided with the first Two grooves, the second groove is used to place the control and 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. Insert the screw through the round hole of the box cover 5-2 into the threaded hole of the box body 5-1 to realize the screw fixing of the box body 5-1 and the box cover 5-2, and the box body 5-1 and the box cover 5-2 are fixed Finally, the micro-channel mechanism 2 and the optical imaging mechanism 3 are opposite, and a certain gap is reserved between the light source mechanism 1 and the micro-channel mechanism 2, and the central axis of the light source mechanism 1 is the same as the central axis of the micro-channel mechanism 2. axis.

In a preferred embodiment, there are four threaded holes, and the four threaded holes are respectively arranged at four right-angled wall edges of the square cavity.

In a preferred embodiment, the threaded holes are equidistantly arranged on the wall edge of the square cavity of the box body 5-1.

The inlet and outlet of the microfluidic channel set in the center of the box body 5-1 are two circular through holes, and the two circular through holes communicate with the inlet and outlet of the microfluidic channel mechanism 2 respectively, and the lubricating oil flows from the microfluidic channel. The channel inlet flows in and the microfluidic channel outlet flows out.

In an optional embodiment, the outer shell 5 is a cylindrical cavity, the box 5-1 is a hollow cylinder with a topless top, and the circular wall of the box 5-1 is provided with a plurality of Threaded hole. Case cover 5-2 is a circular shape, and the right side of case cover 5-2 is provided with circular boss, and the size of the boss of case cover 5-2 fits with casing 5-1, and described case cover 5-2 A circular hole is arranged at a position corresponding to the threaded hole of the casing 5-1.

In an optional embodiment, the outer casing 5 is a rectangular cavity, the box body 5-1 is in a rectangular shape, and a plurality of threaded holes are provided on the rectangular wall of the box body 5-1. Case cover 5-2 is a rectangular shape, and the right side of case cover 5-2 is provided with a square boss, and the size of the boss of case cover 5-2 fits with casing 5-1, and described case cover 5-2 is with The corresponding positions of the threaded holes of the box body 5-1 are provided with round holes.

The light source mechanism 1 and the microchannel 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, the light source mechanism 1, the The central axis of the micro-channel mechanism 2 , the optical imaging mechanism 3 and the outer casing 5 coincides.

The light source mechanism 1 includes 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 optical lens 1-2 is at same level. In a preferred embodiment, the light source 1-1 is a visible light source, preferably an LED light source, in the visible light band.

The microchannel mechanism 2 includes a detection object 2-2 with a periodic structure, a microfluidic channel 2-1, an inlet channel and an outlet channel, and the detection object 2-2 with a periodic structure is fixedly arranged in the microfluidic channel On the left side of 2-1, the inlet port and the outlet port are located on both sides of the microfluidic channel 2-1. The detection object 2-2 with a known periodic structure is arranged opposite to the optical imaging mechanism 3, specifically, the detection object 2-2 with a periodic structure is embedded on the left side of the microfluidic channel 2-1 of the microchannel mechanism 2, The purpose of using the detection object 2-2 with a known periodic structure is to introduce a periodic texture when acquiring the optical image. When the light shines on the object with periodic texture structure through the lubricating oil film, due to the principle of optical image distortion, the optical spectrum refracted by the oil with different water pollution concentrations is different. Detecting the periodic structure of the object helps to better obtain the optical spectrum, and can better detect the difference in the spectrum of the oil with different water pollution concentrations. In one cycle, use the optical image distortion principle to obtain the shape information of the periodically detected object 2-2 placed behind the lubricating oil film, and estimate Water contamination content and lubrication conditions.

In a preferred embodiment, the detection object 2-2 with a periodic structure has a periodic texture, which can be a grid texture or a stripe texture. Preferably, the detection object 2-2 with a periodic structure adopts Stainless steel braided metal mesh wire cloth, the shape of the mesh is any one of square, rectangle or circle.

As shown in Figure 3, the microfluidic channel 2-1 in the microchannel mechanism 2 is a square micro-cavity pipe, which is used to circulate a small amount of hydraulic oil and can form a layer of non-uniform liquid medium (lubricating oil) film , the microfluidic channel 2-1 is arranged between the light source 1-1 and the optical imaging mechanism 3. The inlet port and the outlet port are respectively arranged on both sides of the cavity pipe, and both communicate with the cavity pipe, and lubricating oil flows in from the inlet port and flows out from the outlet port.

The specific connection method between the light source mechanism 1 and the micro-channel mechanism 2 includes: the light source 1-1 of the light source mechanism 1 is pasted in the first groove reserved in the box body 5-1, and the bonding surface of the light source 1-1 is uniform Coated with heat-conducting silica gel for heat dissipation, the optical lens 1-2 of the light source mechanism 1 is embedded in the outer end of the first groove, a gap is reserved between the light source 1-1 and the optical lens 1-2, and the microfluidic mechanism 2 passes through the screw It is fixed on the connection seat of the box body 5-1, and a gap is reserved between the light source mechanism 1 and the micro-channel mechanism 2, and the central axes of the light source mechanism 1 and the micro-channel mechanism 2 are coaxial.

The optical imaging mechanism 3 includes a lens 3-1, a lens sleeve 3-2, a focusing screw barrel 3-3 and a photoelectric imaging device 3-4, and the lens 3-1 in the optical imaging mechanism 3 is embedded in the lens sleeve 3 -2 front end, the outside of the lens sleeve 3-2 is provided with an external thread, which is threadedly connected with the internal thread in the focusing screw barrel 3-3, and the object distance of the imaging system can be adjusted by rotating the lens sleeve 3-2, which is convenient for lens focusing and imaging And to change the magnification, the focusing screw barrel 3-3 is fixed on the case cover 5-2 of the device with screws.

The photoelectric imaging device 3-4 in the optical imaging mechanism 3 is bonded to the center of the case cover 5-2, and 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 It is coaxial with the center of the light source 1-1.

In a preferred embodiment, the photoelectric imaging device 3-4 uses a CCD image sensor, which occupies less space and is easier to apply online moisture monitoring of lubricating oil.

In a preferred embodiment, a partition plate is provided between the light source mechanism 1 and the microchannel mechanism 2, and through holes adapted to the size of the microfluidic channel 2-1 and the number of people are arranged on the partition plate. The fluid channel 2-1 passes through the through hole of the partition plate and enters the inlet and outlet of the microfluidic channel provided in the center of the box body 5-1.

The control analysis system 4 is glued on the box cover 5-2, and the control analysis system 4 is electrically connected with the photoelectric imaging device 3-4, and is used to analyze the optical appearance of the lubricating oil-target object combination obtained by the optical imaging mechanism 3 image.

As shown in Figure 4, an online monitoring method for lubricating oil moisture based on image distortion includes but is not limited to the following steps:

S1. Collect the original object image: feed fresh lubricating oil into the micro-channel 2-1, turn on the light source 1-1 in the light source mechanism 1, and the light passes through the fresh lubricating oil medium in the micro-channel mechanism 2 and has a periodic structure The detection object 2-2, the original object image is obtained on the photoelectric imaging device 3-4 in the optical imaging mechanism 3, that is, the optical appearance image of the fresh lubricating oil-target object combination;

S2. Image collection of deformed objects: pass lubricating oil polluted by water into the micro-channel 2-1, turn on the light source 1-1 in the light source mechanism 1, and light passes through the lubricating oil medium polluted by water in the micro-channel mechanism 2 and the detection object 2-2 with a periodic structure, the image of the deformed object is obtained on the photoelectric imaging device 3-4 in the optical imaging mechanism 3, that is, the optical appearance image of the combination of lubricating oil-target object contaminated by water, and the relevant lubrication information is transmitted. Optical information on agent contamination status;

S3. Perform initial optical image processing on the original object image in the control analysis system 4 to obtain a color cross section of the original object image, and perform deformed optical image processing on the deformed object image in the control analysis system 4 to obtain a color cross section of the deformed object image;

Further, performing optical image processing on the image includes: first, select two grid lines to perform cross-section processing on the original object image and the deformed object image respectively, and extract the image cross-section; then, perform color normalization on each image cross-section Transformation processing, respectively map the pixel color ratio (between 0 and 1) and the pixel position to form a color section.

S4. Define shape parameters representing the object in the color section, and compare the shape parameters of the color section of the original object image and the color section of the deformed object image. Several shape parameters are measured, such as the relative color of the object, the unevenness coefficient of the object width, etc. When the water concentration gradually increases, the amplitude of the color cross-section graph decreases significantly, the relative color parameters of the object decrease linearly, and the unevenness coefficient of the object width decreases gradually. When the water concentration is increased by 1%-10%, the change of the shape parameter value of each concentration is measured. By comparing the value of the shape parameter, the water content in the lubricating oil can be evaluated, and then the lubricating condition of the lubricating oil can be evaluated.

When introducing elements of the 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 words "comprising", "comprising" and "having" are all inclusive and mean that there may be other elements other than the listed elements.

In describing the present invention, it should be understood that the terms "coaxial", "bottom", "left side", "central", "middle", "other end", "upper", "side", " The orientation or positional relationship indicated by "right side", "inside", "front", "both ends" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating Or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention.

In the present invention, unless otherwise clearly specified and limited, the terms "arrangement", "connection", "fixation" and other terms should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined, for Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

It should be noted that those of ordinary skill in the art can understand that all or part of the processes in the above method embodiments can be implemented by instructing related hardware through computer programs, and the programs can be stored in a computer-readable memory In the medium, when the program is executed, it may include the processes of the above-mentioned method embodiments. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM) and the like.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, as for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, please refer to part of the description of the method embodiment. The device embodiments described above are only illustrative, and the units and modules described as separate components may or may not be physically separated. In addition, some or all of the units and modules can also be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.

The above descriptions are only specific implementation methods of the present application. It should be pointed out that those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. , alternatives and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. An online monitoring device for lubricating oil moisture based on image distortion, including: a light source mechanism (1), a micro-channel mechanism (2), an optical imaging mechanism (3), a control analysis system (4), and an outer casing (5) And screw, it is characterized in that, described outer housing (5) comprises box body (5-1) and box cover (5-2), and the center position on the box body (5-1) is provided with the inlet and outlet of microfluidic channel , the left central position of the box body (5-1) is provided with a first groove, and the first groove is located between the inlet and outlet of the microfluidic channel; the right side of the box cover (5-2) is provided with a boss, The boss is provided with a second groove; the light source mechanism (1) and the micro-channel mechanism (2) are arranged in the box (5-1), and the optical imaging mechanism (3) and the control The analysis system (4) is arranged on the box cover (5-2), and the box cover (5-2) is provided with a round hole, and the box body (5-1) is at the position of the box cover (5-2) round hole There are threaded holes on the corresponding shell wall, and insert the screws through the round holes of the box cover (5-2) into the threaded holes of the box body (5-1) to realize the box body (5-1) and the box cover (5-1). 2) fixing; the light source mechanism (1), the micro-channel mechanism (2), the optical imaging mechanism (3) coincide with the central axis of the outer casing (5), and the micro-channel mechanism (2) ) is fixed on the box body (5-1) by screws, a gap is reserved between the light source mechanism (1) and the microchannel mechanism (2), and the center of the light source mechanism (1) and the microchannel mechanism (2) Coaxial; The microchannel mechanism (2) includes a detection object (2-2) with a periodic structure, a microfluidic channel (2-1), an inlet port and an outlet port, and the detection object (2-2) with a periodic structure 2) It is fixedly arranged on the left side of the microfluidic channel (2-1), and the inlet port and the outlet port are located on both sides of the microfluidic channel (2-1). 2. A kind of online monitoring device for lubricating oil moisture based on image distortion according to claim 1, characterized in that, the light source mechanism (1) comprises a light source (1-1) and an optical lens (1-2), the 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 optical lens (1-2) are on the same horizontal line. 3. A kind of lubricating oil moisture on-line monitoring device based on image distortion according to claim 2, is characterized in that, the specific connection mode of light source mechanism (1) and micro-channel mechanism (2) comprises: described light source mechanism ( 1) The light source (1-1) is pasted in the first groove of the box body (5-1), and the optical lens (1-2) of the light source mechanism (1) is embedded in the outer end of the first groove , a gap is reserved between the light source (1-1) and the optical lens (1-2). 4. The on-line monitoring device for lubricating oil moisture based on image distortion according to claim 1, characterized in that the optical imaging mechanism (3) includes a lens (3-1), a lens sleeve (3-2) , the focusing screw barrel (3-3) and the photoelectric imaging device (3-4), the lens (3-1) in the optical imaging mechanism (3) is embedded in the front end of the lens sleeve (3-2), and the lens sleeve ( 3-2) There is an external thread on the outside, which is threadedly connected with the internal thread in the focusing screw barrel (3-3). Turning the lens sleeve (3-2) can adjust the object distance of the imaging system, which is convenient for lens focusing and imaging and changing For magnification, the focusing screw (3-3) is fixed to the case cover (5-2) of the device with screws. 5. A kind of lubricating oil moisture online monitoring device based on image distortion according to claim 4, is characterized in that, the photoelectric imaging device (3-4) in the optical imaging mechanism (3) is bonded to the box cover (5- 2), and 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. The online monitoring device for lubricating oil moisture based on image distortion according to claim 5, characterized in that the photoelectric imaging device (3-4) uses a CCD image sensor. 7. The online monitoring device for lubricating oil moisture based on image distortion according to claim 1, characterized in that the control analysis system (4) is embedded in the second boss of the right side of the box cover (5-2). In the groove, the control analysis system (4) is connected with the photoelectric imaging device (3-4). 8. A method for online monitoring of lubricating oil moisture based on image distortion, comprising the following steps: S1. Collect the original object image: put fresh lubricating oil into the microfluidic channel (2-1), turn on the light source (1-1) in the light source mechanism (1), and the light passes through the fresh lubricating oil in the microfluidic channel mechanism (2). The lubricating oil medium and the detection object (2-2) with a periodic structure, the original object image is obtained on the photoelectric imaging device (3-4) in the optical imaging mechanism (3), that is, the optical combination of fresh lubricating oil-target object Appearance image; S2. Image collection of deformed objects: pass lubricating oil polluted by water into the microfluidic channel (2-1), turn on the light source (1-1) in the light source mechanism (1), and the light passes through the microfluidic channel mechanism (2) The lubricating oil medium polluted by water and the detection object (2-2) with a periodic structure, the image of the deformed object is obtained on the photoelectric imaging device (3-4) in the optical imaging mechanism (3), that is, the lubricating oil polluted by water The optical appearance image of the oil-target object combination conveys optical information about the contamination status of the lubricant; S3. Perform initial optical image processing on the original object image in the control analysis system (4) to obtain the color section of the original object image, and perform deformation optical image processing on the deformed object image in the control analysis system (4) to obtain the deformed object image the color section of S4. Define the shape parameters representing the object in the color cross-section, compare the object shape parameters of the color cross-section of the original object image and the color cross-section of the deformed object image, carry out reliable quantitative analysis of the moisture in the lubricating oil, and check the lubricating conditions of the lubricating oil to evaluate. 9. A kind of lubricating oil moisture online monitoring method based on image distortion according to claim 8, is characterized in that, carrying out optical image processing to image in control analysis system (4) comprises: extracting image cross-section, each Color normalization is performed on the cross-section of the image, and the pixel color ratio is mapped to the pixel position to form a color cross-section.

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