CN110274546A - A kind of oil film thickness scaling method and device based on LIF technology - Google Patents
A kind of oil film thickness scaling method and device based on LIF technology Download PDFInfo
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- CN110274546A CN110274546A CN201910601020.7A CN201910601020A CN110274546A CN 110274546 A CN110274546 A CN 110274546A CN 201910601020 A CN201910601020 A CN 201910601020A CN 110274546 A CN110274546 A CN 110274546A
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- oil film
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0616—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating
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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
A kind of oil film thickness scaling method and device based on LIF technology, belongs to oil film thickness fields of measurement, it is therefore an objective to which this is in order to meet the growth requirement of oil film thickness measuring technique.The present invention injects the lubricating oil containing fluorescer in the container of depth consecutive variations, forms lubricating oil film, is covered with glass plate above lubricating oil film；The laser that laser issues is divided into two equal beams of light intensity, wherein a branch of received by laser detector, another beam is radiated on the lubricating oil film in container；Fluorescence signal is captured using CCD camera, obtains the fluorescent intensity of lubricating oil film different location；The thickness for determining lubricating oil film different location obtains the corresponding fluorescent intensity of lubricating oil film different-thickness, completes calibration.The present invention is suitable for the measurement of oil film thickness.
Description
Technical field
The invention belongs to oil film thickness fields of measurement, and in particular to a kind of oil film thickness measurement based on LIF technology
Technology.
Background technique
Lubrication, which refers to, is added lubricant between the body surface of relative motion, to reduce frictional resistance, reduces body surface
Abrasion.Fluid lubrication is one of most common lubricating system, and two are rubbed by one layer 1.5~2 microns or more of lubricating oil films
Surface is completely separable, and friction is produced from the interior friction between lubrication oil molecule, can substantially improve working performance, and reduction is drawn by friction
The power loss risen extends the secondary service life of friction.Fluid lubrication is widely used in various fields, gear, bearing, piston
Equal mechanical parts often add the lubricating oil of micron order thickness, and separated contact surfaces make component smooth motion.With commercial production levels
Raising, the speed of service of mechanical equipment develops towards high speed direction, and bearing capacity is also increasing, therefore the lubrication feelings of equipment
Condition is more and more severe, and lubrication failure is one of the main reason for machine run breaks down, it is therefore desirable to the lubricity of equipment
It can be carried out real-time monitoring.Can suitable oil film thickness be the index for examining equipment operate normally, to oil film thickness
Carrying out real-time monitoring can help us to understand the superiority and inferiority of equipment lubrication situation, and then grasp the operating status of equipment.
Resistance method of temperature measurement and capacitance measurement belong to measurement method of electricity, need an electrical isolation plane or a complete electricity
The osculating element of isolation installs sensor, increases the complexity of structure, and measurement result is vulnerable to such environmental effects, therefore
It is difficult to be widely used in industrial circle.And optical test method, there is precision height, measuring device is easily built, non-cpntact measurement
The advantages that, it is able to achieve accurately measuring for oil film thickness, has been widely used in the national defences such as aerospace.
1980, Ting used the single-cylinder engine for being equipped with a transparent cylinder, and it is next to develop a kind of technology whereby
Visual research is carried out to piston ring lubrication process and engine oil loss mechanism.1998, Arcoumanis, Duszynski
And Benoist et al. measures oil film thickness between piston ring and cylinder sleeve using laser Induced Fluorescence Technology.Lavieille exists
LIF technology is solved within 2001 to the dependence of fluorescence intensity, while also eliminating the influence of Beer absorption.With numerous experts
With the continuous research of scholar, LIF technology has become the mainstream means in testing field.
Currently, laser induced fluorescence (LIF) technology has good performance in oil film thickness testing field, therefore moisten
The calibration of lubricating oil film thickness improves dynamic response characteristic and is of great significance to measurement accuracy is improved.But lubricating oil film thickness scale
Technology is determined still in the experimental stage, it would be desirable to a kind of simple, easy to operate, the practical oil film thickness calibration side of structure
Method and device make up this technological gap.
Summary of the invention
The present invention is the growth requirement in order to meet oil film thickness measuring technique, is provided a kind of based on LIF technology
Oil film thickness scaling method and device.
A kind of oil film thickness scaling method based on LIF technology of the present invention the following steps are included:
Step 1: injecting the lubricating oil containing fluorescer into the container of depth consecutive variations, lubricating oil film, lubrication are formed
Glass plate is covered with above oil film；
Step 2: control laser, makes laser issue the laser of wave number v, and it is equal that the laser is divided into light intensity
Two beam laser, wherein a branch of received by laser detector, another beam is radiated on the lubricating oil film in container；
Step 3: capturing fluorescence signal using CCD camera, the fluorescent intensity of lubricating oil film different location is obtained；
Step 4: determining the thickness of lubricating oil film different location, the corresponding fluorescent intensity of lubricating oil film different-thickness is obtained,
Complete calibration.
Further, in step 1, the glass plate is coated with the anti-reflection film of laser and fluorescence.
Further, in step 1, container depth consecutive variations along its length, the laser being radiated on lubricating oil film
For sheet laser.
Further, container depth continuously enlarges or reduces along container length direction.
A kind of oil film thickness caliberating device based on LIF technology of the present invention includes: depth consecutive variations
Container 7, laser 2, spectroscope 3, laser detector 4, glass plate 6 and CCD camera；
It is covered with glass plate 6 above the container 7, is the lubricating oil film containing fluorescer in container 7；
The laser that the laser 2 issues is divided into the identical laser of two beam powers through spectroscope 3, a branch of by laser detector
4 receive, and another beam is radiated on the lubricating oil film in container 7；
The CCD camera is for capturing fluorescence signal.
Further, the glass plate 6 is coated with the anti-reflection film of laser and fluorescence.
Further, described device further includes piece light shaping device 5, and described light shaping device 5 is used for being radiated at lubricating oil
Laser on film carries out shaping；The depth of the container 7 consecutive variations along its length.
Further, the depth of container 7 continuously enlarges or reduces along its length.
Certain density fluorescer is added in lubricating oil, fluorescer can issue fluorescence under the excitation of laser, different
The lubricating oil film of thickness can issue the fluorescence of varying strength, and according to Beer Lambert law, oil film thickness h and fluorescence are strong
Relationship between degree I is shown below:
I=I0K(v)F(T,v)Ch (1)
I in formula0What is indicated is the light intensity of initial laser, and that K (v) is indicated is constant related with laser wave number, F (T, v)
Indicate be and temperature, the related constant of laser wave number, C indicate is fluorescer concentration.Therefore, I0, K (v), F (T, v), C
It all can be considered known quantity, oil film thickness h can be calculated according to fluorescence intensity I.
The present invention includes computer system, laser, spectroscope, laser detector, piece light shaping device, upper glass plates, under
Glass plate, CCD camera.Computer system control laser makes it export the laser of certain wave number.Laser becomes after passing through spectroscope
A branch of to be received by laser detector at the laser of two beam different directions, another beam forms sheet laser after piece light shaping device.Under
Glass plate has oblique groove, and the lubricating oil containing fluorescer is added into groove, and lubricating oil can issue fluorescence upon laser irradiation,
And it is shot by CCD camera.After computer system carries out relevant calculation, corresponding calibration result can be exported.
1, the oil film thickness of consecutive variations can be directly arranged in the container of depth consecutive variations, without making glass by clearance gauge
Certain altitude is risen in one end of glass plate, and glass plate cannot be passed perpendicularly through by overcoming fluorescence in traditional lubrication oil film thickness setting method
The shortcomings that.
2, LIF technology belongs to contactless measurement, does not have any impact to oil film thickness, to improve
The practical value of the technology itself.
3, glass plate used has carried out coating film treatment, improves light transmittance, and then guarantee the accuracy of calibration result.
4, entire calibration process carries out under subdued light conditions, avoids environmental factor influence caused by calibration result.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of container in the present invention；
Fig. 2 is Calculation of Oil Film Thickness schematic illustration in the present invention；
Fig. 3 is a kind of structural schematic diagram of the oil film thickness caliberating device based on LIF technology of the present invention.
Specific embodiment
Specific embodiment 1: present embodiment is illustrated referring to Figures 1 and 2, a kind of base described in present embodiment
In the oil film thickness scaling method of LIF technology are as follows:
Step 1: injecting the lubricating oil containing fluorescer into the container of depth consecutive variations, lubricating oil film is formed, it is described
Lubricating oil film upper surface covers one layer of glass plate；
Step 2: control laser, makes laser issue the laser of wave number v, and it is equal that the laser is divided into light intensity
Two beam laser, wherein a branch of received by laser detector, another beam is radiated on the lubricating oil film in container；
Step 3: capturing fluorescence signal using CCD camera, the fluorescent intensity of lubricating oil film different location is obtained；
Step 4: determining the thickness of lubricating oil film different location, the corresponding fluorescent intensity of lubricating oil film different-thickness is obtained,
Complete calibration.
In step 1, container depth is continuously enlarged or is continuously reduced along container length direction, for example, by using wedge shown in FIG. 1
Connected in star as container, the depth at both ends be be not 0 and H, section is triangle, can easily be calculated in groove each
The oil film thickness of a position.The laser being radiated on lubricating oil film carries out shaping using piece light shaping device, forms sheet laser, described
Sheet laser at least covers position corresponding to lubricating oil film certain thickness range, and in Fig. 1, it is all that sheet laser covers lubricating oil film
Position corresponding to thickness.
Specific embodiment 2: illustrating present embodiment in conjunction with Fig. 1 to Fig. 3.One kind described in present embodiment is based on LIF
The oil film thickness caliberating device of technology includes: the container 7, laser 2, spectroscope 3, laser detector of depth consecutive variations
4, glass plate 6 and CCD camera 8；
The depth of container 7 continuously enlarges or reduces along its length, for example, by using wedge-shaped impression shown in FIG. 1 as appearance
Device, bottom portion of groove be it is inclined, the depth at groove both ends be be not 0 and H, section is triangle, can easily be calculated
The oil film thickness of each position in groove, Computing Principle is as shown in Fig. 2, a length of L of oblique groove, and right end depth is H, according to triangle phase
Like criterion, it is away from the corresponding oil film thickness h in the oblique groove left end place lTherefore settable thickness connects within the scope of zero to H
The lubricating oil film of continuous variation.
The container 7 is lubricating oil film, and the fluorescer for being C containing concentration in lubricating oil film, lubricating oil film top is covered with
Glass plate 6.
The laser that the laser 2 issues is divided into the identical laser of two beam powers through spectroscope 3, a branch of by laser detector
4 receive, and measure the light intensity I of initial laser0, as sheet laser after 5 shaping of piece light shaping device, the sheet laser shines another beam
It penetrates on the lubricating oil film in container 7.The sheet laser at least covers position corresponding to lubricating oil film certain thickness range, figure
In 1, sheet laser covers position corresponding to all thickness of lubricating oil film.
Under the irradiation of sheet laser, the fluorescer inside lubricating oil is excited, and issues the fluorescence of some strength, and by
CCD camera 8 captures fluorescence signal.Using computer 1 according to fluorescence intensity I, initial beam intensity I0And other known ginseng
Number is calculated, fluorescence intensity corresponding to final output different-thickness lubricating oil film, completes calibration process.
Claims (8)
1. a kind of oil film thickness scaling method based on LIF technology, which comprises the following steps:
Step 1: injecting the lubricating oil containing fluorescer into the container of depth consecutive variations, lubricating oil film, lubricating oil film are formed
Top is covered with glass plate；
Step 2: control laser, makes laser issue the laser of wave number v, and the laser is divided into equal two of light intensity
Shu Jiguang, wherein a branch of received by laser detector, another beam is radiated on the lubricating oil film in container；
Step 3: capturing fluorescence signal using CCD camera, the fluorescent intensity of lubricating oil film different location is obtained；
Step 4: determining the thickness of lubricating oil film different location, the corresponding fluorescent intensity of lubricating oil film different-thickness is obtained, is completed
Calibration.
2. a kind of oil film thickness scaling method based on LIF technology according to claim 1, which is characterized in that step
In rapid one, the glass plate is coated with the anti-reflection film of laser and fluorescence.
3. a kind of oil film thickness scaling method based on LIF technology according to claim 1 or 2, which is characterized in that
In step 1, consecutive variations, the laser being radiated on lubricating oil film are sheet laser to container depth along its length.
4. a kind of oil film thickness scaling method based on LIF technology according to claim 3, which is characterized in that hold
Device depth continuously enlarges or reduces along container length direction.
5. a kind of oil film thickness caliberating device based on LIF technology characterized by comprising the appearance of depth consecutive variations
Device, laser, spectroscope, laser detector, glass plate and CCD camera；
It is covered with glass plate above the container, is the lubricating oil film containing fluorescer in container；
The laser that the laser issues is divided into the identical laser of two beam powers through spectroscope, a branch of to be received by laser detector,
Another beam is radiated on the lubricating oil film in container；
The CCD camera is for capturing fluorescence signal.
6. a kind of oil film thickness caliberating device based on LIF technology according to claim 5, which is characterized in that institute
State the anti-reflection film that glass plate is coated with laser and fluorescence.
7. a kind of oil film thickness caliberating device based on LIF technology according to claim 5 or 6, which is characterized in that
It further include piece light shaping device, described light shaping device is used to carry out shaping to the laser being radiated on lubricating oil film；The container
Depth consecutive variations along its length.
8. a kind of oil film thickness caliberating device based on LIF technology according to claim 7, which is characterized in that hold
The depth of device continuously enlarges or reduces along its length.
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| CN113092436A (en) * | 2021-05-08 | 2021-07-09 | 广东工业大学 | Oil spill detection method and system based on ultraviolet light excited fluorescence |
| CN113188456A (en) * | 2021-04-21 | 2021-07-30 | 北京理工大学 | Fluorescent dyeing film thickness measurement calibration method based on multiple corrections |
| CN114088252A (en) * | 2021-12-03 | 2022-02-25 | 上海交通大学 | Wall-hitting liquid film calibration device with controllable thickness and temperature |
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