CN206638694U - A kind of rotation-speed measuring device based on double sinusoidal variable density stripeds - Google Patents
A kind of rotation-speed measuring device based on double sinusoidal variable density stripeds Download PDFInfo
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- CN206638694U CN206638694U CN201720226344.3U CN201720226344U CN206638694U CN 206638694 U CN206638694 U CN 206638694U CN 201720226344 U CN201720226344 U CN 201720226344U CN 206638694 U CN206638694 U CN 206638694U
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- variable density
- striped
- double sinusoidal
- rotating shaft
- stripe pattern
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Abstract
It the utility model is related to a kind of rotation-speed measuring device based on double sinusoidal variable density stripeds, the device includes double sinusoidal variable density stripe angle sensors, stripe pattern collection and transport module, stripe pattern processing software module and computer, this method and comprised the following steps：In the double sinusoidal variable density striped sensors of shaft circumference Surface coating to be measured；Stripe pattern acquisition module carries out real-time acquisition and recording to double sinusoidal variable density stripeds；The double sinusoidal variable density stripe patterns collected are transferred to computer by image transmission module；Image processing software module calculates double sinusoidal variable density stripeds left sides in every two field picture and the fringe density information of right side striped, then corner corresponding to rotating shaft is calculated by the density information in left side and right side striped, the instant rotation angular speed and rotating speed of rotating shaft is calculated finally by adjacent two field pictures outer corner difference and sampling time interval.The device can be not only used for the measurement of rotating shaft absolute rotation angle, and can realize the non-cpntact measurement of countershaft corner and transient speed, and measurement apparatus is simple, and measuring speed is fast, and precision is high.
Description
Technical field
Machine vision metrology rotating technique field is the utility model is related to, more particularly to one kind based on double sinusoidal variable densities
The shaft rotary corner sensing and rotation-speed measuring device of striped.
Background technology
The instantaneous corner of countershaft and rotating speed rapidly, continuously and accurately measure the status monitoring for rotating machinery therefore
Barrier diagnosis and speed control have very important function and significance.Such as the rotating shaft of generator, pump and motor rotating machinery
Tachometric survey；The state of this kind of rotating machinery can be obtained by the rotational parameters of the rotating shaft of measurement and can be used for the state of machine
Monitoring and fault diagnosis.Tachometric survey technology can substantially be divided into two classes at present：Analog tachometer and digital tachometer.Simulation
Rotary speed information mainly is converted into analog signal for formula tachometer or other types correspond to the signal of ratio, analog rotating speed
Meter is commonly applied in backfeed loop accurately to control rotating speed.And digital tachometer typically need not relative to analog tachometer
Digital-to-analogue converter.Such tachometric survey meter mainly realizes the measurement of rotating speed, such as optics by the encoder of different physical principles
Encoder, magnetic field encoder, electromagnetic encoder and Hall encoder etc..The selection of encoder mainly by specifically used occasion and
Measurement accuracy is required to be selected.
In recent years, with the progress of imaging sensor manufacturing technology, vibration and tachometric survey technology based on machine vision
Also it is fast-developing.This technology has high efficiency, non-contact, and the characteristics of do not introduce additional mass.Many researchers adopt
Some big structures are marked with the black and white pattern or coded graphics of some high-contrasts, are then carried out using imaging sensor
Real time imagery, to realize the outer corner measurement to some big structures.These methods are mainly by different images frame template image
Characteristic matching and track algorithm obtain the corner information of structure, and measuring speed and precision are heavily dependent on images match
The speed of algorithm and the degree of accuracy.And need to enter the image information in the whole measuring surface of measurement object when carrying out IMAQ
Row collection, the tracking and matching of local feature signal could be carried out.Large-scale IMAQ can not only cause acquisition system to bear
Aggravate, and the high requirement of comparison it is also proposed to the transmission rate of picture signal.
Therefore, on the basis of existing rotating speed measurement method is understood and studied, design it is a kind of it is unique it is double just
For string variable density striped to realize that countershaft corner and rotating speed be accurate, simple and efficient non-contact measurement, this kind of method can be with
The real-time measurement of shaft rotary corner and rotating speed is realized in the case where not increasing the measuring system hardware cost based on machine vision.
The content of the invention
The utility model makes improvement for the above-mentioned problems of the prior art, i.e., skill to be solved in the utility model
Art problem is to provide a kind of rotation-speed measuring device based on double sinusoidal variable density stripeds, and the apparatus and method can realize that countershaft turns
The non-cpntact measurement of speed, measurement apparatus is simple, and speed is fast, and precision is high.
In order to solve the above-mentioned technical problem, the technical solution of the utility model is：One kind is based on double sinusoidal variable density stripeds
Rotation-speed measuring device, including：
A pair of sine variable density striped sensor, is coated on shaft circumference surface to be measured, to encode the rotating shaft to be measured
Corner information；
One stripe pattern gathers and transport module, to be sensed to double sinusoidal variable density stripeds on the rotating shaft surface to be measured
Device carries out continuous acquisition record, and the stripe pattern signal collected is transmitted；The stripe pattern collection and transmission mould
Block includes striped imaging sensor, optical lens, imaging control system and Transmission system；
One computer, to be controlled to stripe pattern collection and transport module, and to being transmitted through Transmission system
Stripe pattern signal to computer is stored and handled；
One stripe pattern handles software module, is arranged in the computer, to enter to described stripe pattern signal
Row processing, calculate the time domain corner and speed curves of rotating shaft.
Double sinusoidal variable density striped sensors are lightweight paster, double sinusoidal variable density striped sensor lightweight patches
The front of piece is stripe pattern, and the back side is viscous layer, and ring is affixed on the circumferential surface of the rotating shaft to be measured.
Double sinusoidal variable density striped sensors are lightweight circular sleeve, double sinusoidal variable density striped sensor sleeves
The external peripheral surface of cylinder is stripe pattern, and sleeve diameter is equal with the diameter of the rotating shaft to be measured, and sleeve is sheathed on described to be measured
In rotating shaft.
Double sinusoidal variable density striped sensors are shaped as rectangle, and the rectangular width is described double
The fringe density change direction of sinusoidal variable density striped sensor surface stripe pattern, the width and the Zhou Changxiang for surveying rotating shaft
Deng.
The stripe pattern of double sinusoidal variable density striped sensor surfaces is divided into a left side along the rectangular length direction
Right both sides striped, the fringe density of left and right sides striped all press varies with sinusoidal function in the width direction, and the density of right side striped becomes
Change curve relative to left side striped variable density curve delayed phase pi/2.
Be coated on the fringe density combination of the left and right sides of double sinusoidal variable density striped sensors on rotating shaft surface with
The different angle of rotating shaft 0-360 degree corners is corresponded, and shaft rotary corner information is obtained by calculating left and right sides fringe density.
Acquisition frame rate and imaging sensor the collection pixel coverage of stripe pattern acquisition module can be adjusted, and stripe pattern is adopted
Collection module is positioned over the center of the length direction for the double sinusoidal variable density striped sensors being coated in rotating shaft to be measured and and rotating shaft
The front of axis perpendicular so that double sinusoidal variable density striped sensor can blur-free imaging gathered in the stripe pattern
The imaging sensor centre position of module.
The striped imaging sensor is face battle array imaging sensor or linear array imaging sensor.
The utility model is realized by the following method, and this method comprises the following steps：
Step S1：The girth of rotating shaft is calculated according to the diameter of the rotating shaft to be measured, is designed according to the girth of rotating shaft double
The width of sinusoidal variable density striped sensor, the width are equal to the girth of rotating shaft, and printed striped；
Step S2：In the double sinusoidal variable density striped sensors of rotating shaft Surface coating to be measured；Adjust stripe pattern collection mould
The image space of block and the imaging focal length for adjusting optical lens, double sinusoidal variable density striped sensors are made to image in stripe pattern
The centre position of imaging sensor in acquisition module；
Step S3：Real-time acquisition and recording is carried out to double sinusoidal variable density striped sensors using stripe pattern acquisition module,
Because the position of imaging sensor and rotating shaft is fixed, the density of imaged striation becomes also with the change of axis of rotation angle
Change；
Step S4：The stripe pattern sequence collected is real-time transmitted to computer by stripe pattern transport module, then is used
Image processing software module carries out the processing of stripe signal；
Step S5：Image processing software module calculates the left side and right side stripe signal bar in every two field picture with one-row pixels
Line density information；And the mathematical relationship combined with left and right fringe density by corner obtain axis of rotation angular speed and rotating speed when
Domain curve；
Step S6：By the corner and rotating speed time-domain curve of computer display display measurement, pass through signal analysis program
Make further data processing and analysis to obtained time-domain curve, realize the status monitoring of machine.
Compared with prior art, the utility model has the advantages that：（1）This pair of sinusoidal variable density fringe quality is several
It can ignore, any interference will not be produced by pasting the dynamic characteristic of countershaft in rotating shaft, relative to some mechanical speeds
There is the possibility reduced to system interference for meter.（2）Tachometric survey meter for some photoelectric coding disc types, measurement
Precision can be split number by code-disc and be limited, and cause fixed error.And the tachometric survey technology of encoder stripe of the striped formula is close
Degree change is continuous, as long as the algorithm that fringe density obtains is accurate enough, it is possible to very small outer corner measurement is realized, in original
The outer corner measurement hardware error as encoded disc type is eliminated in reason.（3）Non-contact type tachometric measurement can be achieved, be based on existing
The rotating shaft measuring method of image trace matching algorithm is compared, it is not necessary to is carried out substantial amounts of image trace matching operation, is improved and be
The arithmetic speed of unified test amount.（4）The significantly reduction of sampled data can be achieved, transmit the raising of frame per second.It is existing based on image with
The Rotating Angle Measurement of track matching algorithm could carry out local feature, it is necessary to be acquired to whole strip encoding image information
The tracking and matching of signal, acquisition system burden is aggravated, caused the waste of hardware resource.And the utility model utilizes double sinusoidal changes
The fringe density information of dense strip carries out the coding of rotating shaft angle, and the minimum stripe information that need to only gather one-row pixels can be real
The tachometric survey of existing rotating shaft, greatly improves image transmission rate, reduces the memory space of image and calculates the time.
Brief description of the drawings
Fig. 1 is the apparatus structure schematic diagram of the utility model embodiment；
Fig. 2 is double sinusoidal variable density stripe design figures in the utility model embodiment；
Fig. 3（a）It is the bar of sinusoidal variable density striped at left and right sides of double sinusoidal variable density stripeds in the utility model embodiment
Line variable density curve, Fig. 3（b）It is the sinusoidal variable density bar in double sinusoidal variable density stripeds left and right sides in the utility model embodiment
Line normalizes variable density curve；
Fig. 4（a）It is by sinusoidal variable density striped at left and right sides of double sinusoidal variable density stripeds in the utility model embodiment
The phase angular curve that normalization variable density curve obtains；Fig. 4（b）It is by double sinusoidal variable density bars in the utility model embodiment
The rotation curve that sinusoidal variable density fringe phase angular curve obtains at left and right sides of line.
In figure, 1- computers, 2- data lines, 3- surveys rotating shaft, the double sinusoidal variable density striped sensors of 4-, 5- bearings
Seat, 6- stripe pattern acquisition modules.
Embodiment
The utility model is described in more detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the apparatus structure schematic diagram of the utility model embodiment.It is based on as shown in figure 1, the present embodiment provides one kind
The corner and rotation-speed measuring device of double sinusoidal variable density stripeds, including the collection of double sinusoidal variable density striped sensors 4, stripe pattern
Module 6, data line 2, computer 1, survey rotating shaft 3 and bearing block 5.Double sinusoidal variable density striped sensors 4, are coated on institute
The circumferential surface of rotating shaft 3 is surveyed, the corner information of rotating shaft 3 is surveyed for encoding.Stripe pattern acquisition module 6, for turning to surveying
Double sinusoidal variable density striped sensors 4 on axle 3 carry out real-time acquisition and recording, and the stripe pattern collected is passed through into data wire
2 are transferred to computer 1.The double sinusoidal variable density bars being installed in the every two field picture of image processing software module calculating of computer 1
Line left side and the fringe density information of right side striped；Then it is corresponding rotating shaft to be calculated by the density information in left side and right side striped
Corner, finally by adjacent two field pictures outer corner difference and sampling time interval calculate rotating shaft instant rotation angular speed and turn
Speed.Finally by computer 1 display screen display measurement corner and rotating speed time-domain curve, carry out further data processing and
Analysis.
Fig. 2 is the design drawing of double sinusoidal variable density striped sensors 4 in the utility model embodiment.It is double in the present embodiment
Sinusoidal variable density striped sensor 4 is shaped as rectangle, double sinusoidal variable density striped sensors 4 along fringe density change side
To width it is equal with the girth of surveyed rotating shaft 3.The stripe pattern on double sinusoidal surfaces of variable density striped sensor 4 is divided into left and right two
Side slat line, the fringe density of left and right sides striped all press varies with sinusoidal function, and the variable density curve of right side striped is relative to a left side
Side slat line variable density curve delayed phase pi/2.Before measurement, by double sinusoidal variable density striped sensors 4 along fringe density
Change direction is located on the circumferential surface of rotating shaft 3, with coding survey rotating shaft rotational angle.Double sinusoidal variable density striped sensors 4
The left and right sides fringe density combination with surveys rotating shaft 0-360 degree corners different angle correspond, pass through calculating or so
Both sides fringe density obtains shaft rotary corner information.
Fig. 2 is a kind of double sinusoidal variable density striped sensings for being used to measure axis of rotation parameter in the utility model embodiment
The schematic diagram of device 4.In the engineering survey of reality, the sensor of different strip forms can be designed according to the characteristics of structure,
Such as make the shaft sleeve of strip form either coding disk or using spraying striped etc., the unlisted institute of this patent in rotating shaft
There are a variety of strip forms or paste form, but this reality is belonged to based on the measurement that method of the present utility model is carried out
With new protection domain.
Fig. 3（a）It is the sinusoidal variable density bar in double sinusoidal left and right sides of variable density striped sensor 4 in the utility model embodiment
The fringe density change curve of line sensor 4；Fig. 3（b）It is double sinusoidal variable density striped sensors 4 in the utility model embodiment
Left and right sides sine variable density striped normalization variable density curve.
Fig. 4（a）It is by the sinusoidal variable density in double sinusoidal left and right sides of variable density striped sensor 4 in the utility model embodiment
The phase angular curve that the normalization variable density curve of striped obtains；Fig. 4（b）It is by double sinusoidal changes in the utility model embodiment
The rotation curve that the sinusoidal variable density fringe phase angular curve in the left and right sides of dense strip sensor 4 obtains.Obtained corner information
Just corresponded with the axis of rotation angle information of one week.
The present embodiment additionally provides the rotating shaft rotating speed measurement method using said apparatus, as shown in Fig. 1,2,3 and 4, including
Following steps：
Step S1：The girth of rotating shaft is calculated according to the diameter of the rotating shaft to be measured, is designed according to the girth of rotating shaft double
The width of sinusoidal variable density striped sensor, the width are equal to the girth of rotating shaft, and printed striped；
Step S2：In the double sinusoidal variable density striped sensors of rotating shaft Surface coating to be measured；Adjust stripe pattern collection mould
The image space of block and the imaging focal length for adjusting optical lens, double sinusoidal variable density striped sensors are made to image in stripe pattern
The centre position of imaging sensor in acquisition module；
Step S3：Real-time acquisition and recording is carried out to double sinusoidal variable density striped sensors using stripe pattern acquisition module,
Because the position of imaging sensor and rotating shaft is fixed, the density of imaged striation becomes also with the change of axis of rotation angle
Change；
Step S4：The stripe pattern sequence collected is real-time transmitted to computer by stripe pattern transport module, then is used
Image processing software module carries out the processing of stripe signal；
Step S5：Image processing software module calculates the left side and right side stripe signal bar in every two field picture with one-row pixels
Line density information；And the mathematical relationship combined with left and right fringe density by corner obtain axis of rotation angular speed and rotating speed when
Domain curve；
Step S6：By the corner and rotating speed time-domain curve of computer display display measurement, pass through signal analysis program
Make further data processing and analysis to obtained time-domain curve, realize the status monitoring of machine.
Further, density mathematics becomes in the width direction with right side striped on the left of double sinusoidal variable density striped sensors
Changing relational expression is：
WhereinWithTo design minimum and maximum fringe density during double sinusoidal variable density striped sensors；For striped variable density curves on the left of double sinusoidal variable density striped sensors,It is right for double sinusoidal variable density striped sensors
Side slat line variable density curve,NMake a living the total of sinusoidal variable density striped sensor left and right sides fringe density change curve in pairs
Points,nFor total pointsNInnPoint；
The frame bar print image moment collects on the left of double sinusoidal variable density striped sensors and right side normalization bar
Line densityCalculation formula is：
The frame bar print image moment collects on the left of double sinusoidal variable density striped sensors and right side normalization bar
Sinusoidal phase angle calculation formula corresponding to line density is：
Wherein,Phase1 is theThe frame bar print image moment is collected on the left of double sinusoidal variable density striped sensors
Sinusoidal phase angle corresponding to fringe density,Phase2 be theThe frame bar print image moment collects double sinusoidal variable densities
Sinusoidal phase angle on the right side of striped sensor corresponding to fringe density；
The frame bar print image moment collects on the left of double sinusoidal variable density striped sensors and right side striped is sinusoidal
Rotating shaft angle corresponding to phase angleCalculation formula is：
Frame bar print image moment rotating shaft instantaneous angular velocityFormula of mathematical be：
Two field picture moment rotating shaft transient speedFormula of mathematical be：
Wherein,For sample frequency corresponding to stripe pattern acquisition module,For the sampling frequency of stripe pattern acquisition module
The inverse of rate.
Above is preferred embodiment of the present utility model, all changes made according to technical solutions of the utility model are produced
Function without departing from technical solutions of the utility model scope when, belong to the scope of protection of the utility model.
Claims (8)
- A kind of 1. rotation-speed measuring device based on double sinusoidal variable density stripeds, it is characterised in that：IncludingA pair of sine variable density striped sensor, is coated on shaft circumference surface to be measured, to encode turning for the rotating shaft to be measured Angle information；One stripe pattern gathers and transport module, to enter to double sinusoidal variable density striped sensors on the rotating shaft surface to be measured Row continuous acquisition is recorded, and the stripe pattern signal collected is transmitted；The stripe pattern collection and transport module bag Include striped imaging sensor, optical lens, imaging control system and Transmission system；One computer, to be controlled to stripe pattern collection and transport module, and to being transferred to meter through Transmission system The stripe pattern signal of calculation machine is stored and handled；One stripe pattern handles software module, is arranged in the computer, to described stripe pattern signal Reason, calculate the time domain corner and speed curves of rotating shaft.
- A kind of 2. rotation-speed measuring device based on double sinusoidal variable density stripeds according to claim 1, it is characterised in that：Institute It is lightweight paster to state double sinusoidal variable density striped sensors, and the front of double sinusoidal variable density striped sensor lightweight pasters is Stripe pattern, the back side are viscous layer, and ring is affixed on the circumferential surface of the rotating shaft to be measured.
- A kind of 3. rotation-speed measuring device based on double sinusoidal variable density stripeds according to claim 1, it is characterised in that：Institute It is lightweight circular sleeve to state double sinusoidal variable density striped sensors, the excircle of double sinusoidal variable density striped sensor sleeves Surface is stripe pattern, and sleeve diameter is equal with the diameter of the rotating shaft to be measured, and sleeve is sheathed in the rotating shaft to be measured.
- 4. a kind of rotation-speed measuring device based on double sinusoidal variable density stripeds according to Claims 2 or 3, its feature exist In：Double sinusoidal variable density striped sensors are shaped as rectangle, and the rectangular width is described double sinusoidal The fringe density change direction of variable density striped sensor surface stripe pattern, the width are equal with the girth of surveyed rotating shaft.
- A kind of 5. rotation-speed measuring device based on double sinusoidal variable density stripeds according to claim 4, it is characterised in that：Institute The stripe pattern for stating double sinusoidal variable density striped sensor surfaces is divided into left and right sides striped along the rectangular length direction, The fringe density of left and right sides striped all presses varies with sinusoidal function, the variable density of right side striped along the rectangle width Curve is relative to left side striped variable density curve delayed phase pi/2.
- A kind of 6. rotation-speed measuring device based on double sinusoidal variable density stripeds according to claim 5, it is characterised in that：Bag It is overlying on fringe density combination and the rotating shaft 0-360 degree of the left and right sides of double sinusoidal variable density striped sensors on rotating shaft surface The different angle of corner is corresponded, and shaft rotary corner information is obtained by calculating left and right sides fringe density.
- 7. a kind of rotation-speed measuring device based on double sinusoidal variable density stripeds according to claim 5 or 6, its feature exist In：Acquisition frame rate and imaging sensor the collection pixel coverage of stripe pattern acquisition module can be adjusted, stripe pattern collection mould Block is positioned over the center of the length direction for the double sinusoidal variable density striped sensors being coated in rotating shaft to be measured and and rotating shaft core Vertical front so that double sinusoidal variable density striped sensor can blur-free imaging in the stripe pattern acquisition module Imaging sensor centre position.
- A kind of 8. rotation-speed measuring device based on double sinusoidal variable density stripeds according to claim 7, it is characterised in that：Institute It is face battle array imaging sensor or linear array imaging sensor to state striped imaging sensor.
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| CN201720226344.3U CN206638694U (en) | 2017-03-09 | 2017-03-09 | A kind of rotation-speed measuring device based on double sinusoidal variable density stripeds |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018161717A1 (en) * | 2017-03-09 | 2018-09-13 | 福州大学 | Rotation speed measuring device and method employing two sinusoidal variable density fringes |
| CN113447670A (en) * | 2021-06-25 | 2021-09-28 | 福州大学 | Rotation speed measuring method and system for monocular linear array visual tracking stripe coding mark |
| CN117571506A (en) * | 2024-01-15 | 2024-02-20 | 西南交通大学 | Shear modulus measuring device and method based on Michelson equal-thickness interference |
-
2017
- 2017-03-09 CN CN201720226344.3U patent/CN206638694U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018161717A1 (en) * | 2017-03-09 | 2018-09-13 | 福州大学 | Rotation speed measuring device and method employing two sinusoidal variable density fringes |
| CN113447670A (en) * | 2021-06-25 | 2021-09-28 | 福州大学 | Rotation speed measuring method and system for monocular linear array visual tracking stripe coding mark |
| CN113447670B (en) * | 2021-06-25 | 2022-08-16 | 福州大学 | Rotation speed measuring method and system for monocular linear array visual tracking stripe coding mark |
| CN117571506A (en) * | 2024-01-15 | 2024-02-20 | 西南交通大学 | Shear modulus measuring device and method based on Michelson equal-thickness interference |
| CN117571506B (en) * | 2024-01-15 | 2024-03-29 | 西南交通大学 | Shear modulus measuring device and method based on Michelson equal-thickness interference |
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