CN108180975A - A kind of contactless Vibration-Measuring System and method - Google Patents
A kind of contactless Vibration-Measuring System and method Download PDFInfo
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- CN108180975A CN108180975A CN201711294171.XA CN201711294171A CN108180975A CN 108180975 A CN108180975 A CN 108180975A CN 201711294171 A CN201711294171 A CN 201711294171A CN 108180975 A CN108180975 A CN 108180975A
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- camera
- vibration
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- measurement
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
-
- 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
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
Abstract
A kind of contactless Vibration-Measuring System, for measuring film surface vibration, including：Two cameras, tripod, light source, computers, the camera and light source are mounted on the tripod, the light source is used to irradiate the tested region of film surface, the image of the camera shooting tested region is simultaneously sent to the computer, and computer disposal described image obtains film surface Vibration Condition.Compared with prior art, the present invention can carry out remote non-contact measurement in space to the vibratory output in flexible pocket body surface face, dependent variable, contact measurement is excluded to interfere the artificial stress of flexible utricule, significantly improve measurement accuracy, traditional measurement point is extended to measurement field, the vibration of any point, strained situation in measured zone can be analyzed.Included calibration function eliminates measurement error caused by binocular optical system installation, quick online acquisition, high efficiency off-line processing, while has round-the-clock power of test.
Description
Technical field
The present invention relates to vibration measurement field, more particularly to a kind of contactless Vibration-Measuring System and method, especially
Suitable for the vibration measurement of the frivolous film surface such as dirigible utricule.
Background technology
In the field of high altitude airship containing power, it is often necessary to analyze the disturbance of natural environment and the vibration of propulsion device to whole
The vibration effect of a dirigible utricule.Such as in normal flight analytic process, need to avoid the vibration of propulsion system to cause propulsion
System locally occurs resonance with utricule interface and causes the consequences such as gas leakage, the decline of utricule intensity so as to cause utricule damage, needs thus
The Vibration Condition on important area utricule surface under each operating mode is detected, traditional measurement method is divided into two kinds.
One kind is contact type measurement, the methods of contact type measurement mode is as installed acceleration transducer, not only installing analysis
Process is complicated, and the sensor installed can change the vibration regularity on membrane body surface, it is made not measure accurately, influence to survey
Measure result.In addition, the measurement method can only location proximate where measurement sensor Vibration Condition, and can not know region-of-interest
The Vibration Condition of interior multiple spot, while can not also measure the dependent variable on utricule surface during vibration analysis.
Second is contactless Doppler type laser measurement, although Doppler type Laser Measuring avoids and utricule surface
Be in direct contact, the shortcomings that so as to influence whether utricule surface vibration rule, but it is only applicable to single-point or tested region
Smaller situation, for large area, solid, multiple spot object to be measured, above two method is all inapplicable.
Invention content
To solve problem above, the invention discloses a kind of contactless Vibration-Measuring System and methods, are mainly used for solving
Certainly following technical problem：Infrared image sequence acquisition, processing are vibrated under a variety of environment of dirigible utricule；Dirigible balloon vibrations mode point
Analysis；Dirigible utricule strain measurement；Telemeasurement is realized by replacing camera lens；System calibration.
Specifically, according to an aspect of the present invention, the present invention provides a kind of contactless Vibration-Measuring System and sides
Method, the system comprises：Two frame cameras, tripod, light source, computer, the camera and light source are mounted on three foot
On frame, the light source is used to irradiate the tested region of film surface, and the camera is used for the shooting to tested region and will figure
As being sent to the computer, computer calculates according to described image and obtains object vibration situation.
Preferably, the camera is industrial infrared camera, by the camera lens and high-resolution infrared CCD figure interconnected
As sensor forms.
Preferably, the light source is infrared light supply irradiation unit, can be to illumination wavelength, direction, intensity and light beam cone angle
It is adjusted.
Preferably, the system also includes optical correction's plate, for the installation site of camera described in calibration measurement.
Preferably, the system also includes transmission cable, for connecting the camera and computer.
Specifically, according to another aspect of the present invention, a kind of contactless vibration measurement method using above system,
It is characterised in that it includes：
Multiple mark points are demarcated in tested region；
Light source is used to irradiate tested region so that tested region is completely covered in light beam, adjusting described two cameras makes to be tested
Region is full of the visual field；
The installation site of the camera is calibrated using optical correction's plate；
The image of camera shooting tested region is simultaneously sent to the computer；
Computer disposal described image obtains film surface Vibration Condition.
Further, the scaling method of the mark point is：
The label is carried out using infrared fluorescent labels pen or hand-held IR fluorescence paint spraying and splashing facility.
Further, the unordered random distribution of the mark point, density are more than the reticular density of the standard test panel.
Further, the installation site that the camera is calibrated using optical correction's plate is included：Utilize binocular vision
Field relationship inverse goes out the relative installation of camera and assesses inverse quality, draws after standard deviation is up to standard as when measuring in next step
Installation position data.
Further, the computer disposal described image obtains film surface Vibration Condition and includes：Utilize digitized map
As correlation principle analyzes the gray value pattern subset of image sequence.
The advantage of the invention is that：Compared with prior art, the present invention can carry out the vibratory output of flexible utricule, dependent variable
Remote non-contact measurement in space excludes contact measurement and the artificial stress of flexible utricule is interfered, significantly improve measurement accuracy with
And traditional measurement point is extended to measurement field, the vibration of any point, strained situation in measured zone can be analyzed.Included school
Quasi- function eliminates measurement error caused by binocular optical system installation, quick online acquisition, high efficiency off-line processing.Have simultaneously
There is round-the-clock power of test.
Description of the drawings
By reading the detailed description of following detailed description, it is various other the advantages of and benefit it is common for this field
Technical staff will become clear.Attached drawing is only used for showing the purpose of specific embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 is：Contactless Vibration-Measuring System forms figure substantially.
Fig. 2 is：Contactless vibration measurement calibration system forms figure substantially.
Fig. 3 is：Contactless vibration measurement analytic process schematic diagram.
Fig. 4 is：The vibration displacement cloud atlas obtained using the contactless Vibration-Measuring System of the present invention.
Fig. 5 is：The oscillating curve and rumble spectrum figure obtained using the contactless Vibration-Measuring System of the present invention.
Fig. 6 is：The morphable three dimensional figure obtained using the contactless Vibration-Measuring System of the present invention.
Fig. 7 is：The strain curve figure obtained using the contactless Vibration-Measuring System of the present invention.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although this public affairs is shown in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to be best understood from the disclosure, and can be by this public affairs on the contrary, providing these embodiments
The range opened completely is communicated to those skilled in the art.
The present invention is a kind of contactless Vibration-Measuring System of infrared optics, based on binocular vision mark point recognition measurement side
Based on Binocular Vision Principle, appropriately sized, density characteristic indication is sticked or draws on dirigible utricule surface to be measured for method
Point borrows Open CV and increases income function library algorithm, in combination with practical application request, realizes the vibration data to Vibration Targets
Carry out the purpose of high-acruracy survey.
As shown in Figure 1,1 is dirigible utricule to be measured, it is some detected part of dirigible, such as roof support and dirigible utricule interface
Neighbouring utricule film.2 be the test zone on dirigible utricule to be measured, and region 2 to be measured delimited according to demand, convenient for observation.
The present invention a kind of contactless Vibration-Measuring System of infrared optics form substantially including：Binocular industry infrared camera 3 and 4,
Data acquisition process computer 5, binocular Infrared Industrial camera tripod 6, infrared optics calibration plate 7, transmission cable 8 and active
Infrared light supply irradiation unit 9.Introduce each component part of Vibration-Measuring System of the present invention one by one below.
Binocular industry infrared camera 3 and 4, on the binocular Infrared Industrial camera tripod 6, wherein imaging
First 4 are made of camera lens 4-1, high-resolution infrared CCD imaging sensor 4-2, and wherein camera lens 4-1 is used to adjust aperture, focal length, put
The parameters such as big multiplying power can correspondingly adjust camera visual field size according to area size to be measured difference.High-resolution infrared CCD
Imaging sensor 4-2 obtains test zone infrared image sequence, and via transmission line for online at set time intervals
The image sequence of acquisition is transmitted to data acquisition process computer 5 by cable 8.High-resolution infrared CCD imaging sensor 4-2 is used
Overall situation exposure prevents the jelly effect that roller shutter exposes from bringing error to measurement.
Binocular industry infrared camera 3 and 4, should be as possible in the case where not influencing observation quality at a distance of about 0.5~0.8 meter
It is arranged apart, to improve measurement accuracy.Each camera 3 or 4 has two groups of camera lenses, can according to different distance, visual field size into
Row selection.According to another preferred embodiment of the invention, in addition to camera lens 4-1, the system can also include alternative telephoto lens,
For more remote non-cpntact measurement；According to another preferred embodiment of the invention, binocular industry infrared camera 3 and 4 has
The infrared compensation system of standby environment enables a system to be applied in the environment there are strong Infrared jamming, improves being applicable in for system
Property.
Data acquisition process computer 5, with binocular industry infrared camera 3 and 4 by carrying camera link interfaces
High-speed transfer cable 8 connects.In order to meet the big data throughput demand of collecting computer, data acquisition process computer 5 is matched
The higher solid state disk of standby read-write rate or RAID0 disk arrays carry out data storage, while in order to meet Data Post
Demand, data acquisition process computer 5 are equipped with the graphics processor of CPU and 2~3 big caching of high frequency of multithreading high primary frequency
(GPU).The high speed solid hard disk is used to store the gathered data of real-time Transmission.The graphics processor is located at high speed image sequence
On row analog input card, wherein high speed image sequence acquisition board is for online acquisition, reduction image sequence data.The data are adopted
After collection processing computer 5 receives the image data of binocular industry infrared camera 3 and 4, it is sent to high speed image sequence acquisition
In board and high speed solid hard disk, by post processing and analysis software, the position of calibration binocular industry infrared camera 3 and 4, simultaneously
It being capable of off-line analysis data.In addition camera link are a kind of codes and standards, specification digital camera and image pick-up card it
Between interface, as long as its significance lies in that meeting the video camera of Camera Link standards and image card can physically interconnect.
Binocular Infrared Industrial camera tripod 6, fast demountable fold, easy to carry and rapid deployment.
Optical correction's plate 7, it is optional there are many specification, it can be selected according to the demand of the size of test zone and measurement accuracy
The calibration plate of different size is selected, otherwise the closeer measurement accuracy of plate face more magnetic dot arrays is higher smaller.Due to binocular industry infrared photography
First 3 and 4 installation may be there are error, therefore calibrates binocular industry infrared photography using optical standard plate 7 after mounting
First 3 and 4, and calibration effect is assessed, the measuring precision can be greatlyd improve.
High-speed transfer cable 8 for connecting data acquisition process computer 5 and binocular industry infrared camera 3 and 4, is protected
The high-speed transfer of data is demonstrate,proved.
Active infrared light source irradiation unit 9, for providing infrared illumination for system, the infrared light sent out is through fluorescence calibration point
Diffusing reflection enter binocular industry infrared camera 3,4.The illumination wavelength of active infrared light source irradiation unit 9, direction, intensity and
Light beam cone angle is adjustable, meets different use demands.It is irradiated due to of the invention using active infrared light source irradiation unit 9,
The Vibration-Measuring System of the present invention outer indoors can carry out round-the-clock test, have stronger adaptive capacity to environment.
Use the vibration measurement of the progress dirigible utricule of the above-mentioned contactless Vibration-Measuring System of infrared optics of the present invention
Journey is as follows：
(1) IR fluorescence scatterplot is demarcated
In order to ensure that measuring system can effectively observe the tested region 2 on dirigible utricule 1, need first to being tested area
Domain 2 carry out IR fluorescence scatterplot calibration, smaller test zone can be marked using infrared fluorescent labels pen, for compared with
Hand-held IR fluorescence paint spraying and splashing facility can be used efficiently to be demarcated for big test zone.The principle of calibration be calibration point as possible
Unordered random distribution, calibration dot density cannot be less than the reticular density of standard test panel 7, to ensure measurement accuracy.
(2) system parameter settings
As shown in Figure 1, by system alignment tested region 2, open active infrared light source irradiation unit 9 and irradiate tested region,
Make light beam that tested region be completely covered by adjusting illumination beam direction, cone angle etc..Adjust the coke on exposure intensity and camera lens 4-1
Making tested region away from, aperture, brightness is moderate, and scatterplot is high-visible, eliminates picture overexposure, can be used when necessary red full of the visual field
External compensation system.The shutter speed of camera 3,4 is set on data acquisition process computer 5, frame per second is made to shake for tested region 2
Twice or so of dynamic frequency maximum estimated value, it is identical with camera 4 to the adjustment of camera 3, it repeats no more.
(3) measuring system is calibrated
Before measurement, first it is placed on before tested region 2 using optical correction's plate 7 and camera 3,4 is calibrated, optical correction
Plate 7 is white background, there is the logos point according to array arrangement thereon, and the distance between each point is known.Binocular visual field is utilized afterwards
Relationship inverse goes out the relative installation of binocular industry camera and assesses inverse quality, and next pacing is used as after standard deviation is up to standard
The installation position data quoted during amount.
(4) test image data acquire
The infrared image number that pretreatment, storage binocular camera 3,4 acquire online of collecting computer 5 when testing beginning
According to until test terminates.
(5) Data Post
There are the data that early period acquires, one of the characteristics of data processing work can carry out offline, this is also this system.Afterwards
Processing will be analyzed the gray value pattern subset of image sequence using digital picture correlation principle, process such as Fig. 3 institutes
Show.Situation namely our institutes it can thus be concluded that the displacement of tested region any point, relative displacement of multi-point etc. change with time
It is required that vibration and strained situation.
Fig. 4-7 is that the technique effect obtained using the contactless Vibration-Measuring System of the present invention is illustrated.Wherein, Fig. 4 is
The vibration displacement cloud atlas obtained using the contactless Vibration-Measuring System of the present invention, Fig. 5 are using the contactless of the present invention
The oscillating curve and rumble spectrum figure that Vibration-Measuring System obtains, Fig. 6 are the contactless Vibration-Measuring System using the present invention
The morphable three dimensional figure of acquisition, Fig. 7 are the strain curve figure obtained using the contactless Vibration-Measuring System of the present invention.
From above four figures as can be seen that using contactless Vibration-Measuring System of the invention, compared with prior art,
The present invention can carry out remote non-contact measurement in space to the vibratory output of flexible airship utricule, dependent variable, exclude contact measurement pair
The artificial stress interference of flexible airship utricule, significantly improves measurement accuracy and traditional measurement point is extended to measurement field, can
To analyze the vibration of any point, strained situation in measured zone.Included calibration function eliminates binocular optical system installation and leads
The measurement error of cause, quick online acquisition, high efficiency off-line processing.There is round-the-clock power of test simultaneously.
More than, illustrative specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and is appointed
What those familiar with the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in, all
It is covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of contactless Vibration-Measuring System, for measuring film surface vibration, which is characterized in that including：Two camera shootings
Head, tripod, light source, computer, the camera and light source are mounted on the tripod, and the light source is used to irradiate film
The tested region on surface, the image of the camera shooting tested region is simultaneously sent to the computer, described in computer disposal
Image obtains film surface Vibration Condition.
2. system according to claim 1, which is characterized in that the camera is industrial infrared camera, by interconnecting
Camera lens and high-resolution infrared CCD imaging sensor composition.
3. system according to claim 1, which is characterized in that the light source is infrared light supply irradiation unit, can be to irradiation
Wavelength, direction, intensity and light beam cone angle are adjusted.
4. system according to claim 1, which is characterized in that the system also includes optical correction's plate, for calibration measurement
The installation site of the camera.
5. according to system described in claim 1-4, which is characterized in that the system also includes transmission cables, described for connecting
Camera and computer.
A kind of 6. contactless vibration measurement method using system described in claim 1-5 any one, which is characterized in that packet
It includes：
Multiple mark points are demarcated in tested region；
Light source is used to irradiate tested region so that tested region is completely covered in light beam, adjusting described two cameras makes tested region
Full of the visual field；
The installation site of the camera is calibrated using optical correction's plate；
The image of camera shooting tested region is simultaneously sent to the computer；
Computer disposal described image obtains film surface Vibration Condition.
7. method according to claim 6, which is characterized in that the scaling method of the mark point is：
The label is carried out using infrared fluorescent labels pen or hand-held IR fluorescence paint spraying and splashing facility.
8. method according to claim 7, which is characterized in that the unordered random distribution of mark point, density are more than described
The reticular density of standard test panel.
9. method according to claim 6, which is characterized in that the installation that the camera is calibrated using optical correction's plate
Position includes：Go out the relative installation of camera using binocular visual field's relationship inverse and assess inverse quality, standard deviation is up to standard
The installation position data quoted when being measured afterwards as next step.
10. according to claim 6-9 any one the methods, which is characterized in that the computer disposal described image obtains
Film surface Vibration Condition includes：The gray value pattern subset of image sequence is divided using digital picture correlation principle
Analysis.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108709629A (en) * | 2018-06-25 | 2018-10-26 | 华南理工大学 | Film square vibration detection control device and method based on laser displacement sensor |
| CN109115877A (en) * | 2018-08-07 | 2019-01-01 | 广东工业大学 | A kind of camber mode damnification recognition method based on DIC technology |
| CN109521404A (en) * | 2018-10-12 | 2019-03-26 | 上海交通大学 | The evaluation of accuracy and system of vibration measurement based on fmcw radar |
| CN109945776A (en) * | 2019-02-01 | 2019-06-28 | 天津大学 | A kind of displacement/strain measurement method in electrochemistry based on fluorescent particle markers and active optics measurement |
| CN109945796A (en) * | 2019-04-12 | 2019-06-28 | 四川大学 | A kind of contactless measuring system and method for the microstrain of rock sample circumferential direction |
| CN110487196A (en) * | 2019-08-21 | 2019-11-22 | 泉州装备制造研究所 | Elastic wave test device based on dynamic deformation measurement |
| CN110987148A (en) * | 2019-12-05 | 2020-04-10 | 浙江理工大学 | Knitting needle vibration detection system and method based on image tracing point dynamic tracking analysis |
| CN111089548A (en) * | 2019-12-16 | 2020-05-01 | 天津大学 | Medium-and-long-distance three-dimensional imaging system with high-resolution texture |
| CN111380864A (en) * | 2018-12-27 | 2020-07-07 | 南京理工大学 | Method for calibrating plastic deformation rheology of material by fluorescent nanoparticles |
| CN113175889A (en) * | 2021-05-28 | 2021-07-27 | 中国科学院空天信息创新研究院 | Airship capsule strain online monitoring device |
| CN116399440A (en) * | 2023-06-08 | 2023-07-07 | 中国船舶集团有限公司第七一九研究所 | Propeller vibration measuring device and method |
| RU2803076C1 (en) * | 2022-12-30 | 2023-09-06 | Автономная некоммерческая образовательная организация высшего образования "Сколковский институт науки и технологий" | System and method for contactless measurement of object surface vibration parameters on the basis of a neuromorphous camera |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108709629A (en) * | 2018-06-25 | 2018-10-26 | 华南理工大学 | Film square vibration detection control device and method based on laser displacement sensor |
| CN108709629B (en) * | 2018-06-25 | 2024-03-22 | 华南理工大学 | Square film vibration detection control device and method based on laser displacement sensor |
| CN109115877A (en) * | 2018-08-07 | 2019-01-01 | 广东工业大学 | A kind of camber mode damnification recognition method based on DIC technology |
| CN109115877B (en) * | 2018-08-07 | 2021-08-24 | 广东工业大学 | Curvature modal damage identification method based on DIC technology |
| CN109521404A (en) * | 2018-10-12 | 2019-03-26 | 上海交通大学 | The evaluation of accuracy and system of vibration measurement based on fmcw radar |
| CN111380864A (en) * | 2018-12-27 | 2020-07-07 | 南京理工大学 | Method for calibrating plastic deformation rheology of material by fluorescent nanoparticles |
| CN111380864B (en) * | 2018-12-27 | 2022-12-13 | 南京理工大学 | Method for calibrating plastic deformation rheology of material by fluorescent nanoparticles |
| CN109945776A (en) * | 2019-02-01 | 2019-06-28 | 天津大学 | A kind of displacement/strain measurement method in electrochemistry based on fluorescent particle markers and active optics measurement |
| CN109945796A (en) * | 2019-04-12 | 2019-06-28 | 四川大学 | A kind of contactless measuring system and method for the microstrain of rock sample circumferential direction |
| CN109945796B (en) * | 2019-04-12 | 2024-02-23 | 四川大学 | Non-contact measurement system and method for circumferential micro-strain of rock sample |
| CN110487196A (en) * | 2019-08-21 | 2019-11-22 | 泉州装备制造研究所 | Elastic wave test device based on dynamic deformation measurement |
| CN110987148A (en) * | 2019-12-05 | 2020-04-10 | 浙江理工大学 | Knitting needle vibration detection system and method based on image tracing point dynamic tracking analysis |
| CN111089548A (en) * | 2019-12-16 | 2020-05-01 | 天津大学 | Medium-and-long-distance three-dimensional imaging system with high-resolution texture |
| CN113175889A (en) * | 2021-05-28 | 2021-07-27 | 中国科学院空天信息创新研究院 | Airship capsule strain online monitoring device |
| CN113175889B (en) * | 2021-05-28 | 2023-03-14 | 中国科学院空天信息创新研究院 | Airship capsule strain online monitoring device |
| RU2803076C1 (en) * | 2022-12-30 | 2023-09-06 | Автономная некоммерческая образовательная организация высшего образования "Сколковский институт науки и технологий" | System and method for contactless measurement of object surface vibration parameters on the basis of a neuromorphous camera |
| CN116399440A (en) * | 2023-06-08 | 2023-07-07 | 中国船舶集团有限公司第七一九研究所 | Propeller vibration measuring device and method |
| CN116399440B (en) * | 2023-06-08 | 2023-08-04 | 中国船舶集团有限公司第七一九研究所 | Propeller vibration measuring device and method |
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