CN108645602A - Rotating machinery tip clearance and blade rotational speed Integrated Measurement System and method, image processing program - Google Patents
Rotating machinery tip clearance and blade rotational speed Integrated Measurement System and method, image processing program Download PDFInfo
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Abstract
The invention discloses a kind of rotating machinery tip clearance and blade rotational speed Integrated Measurement System and method, image processing program, can achieve the effect that can measure tip clearance and blade rotational speed using only high frequency imaging collector.The present invention includes image acquisition device, image pick-up card, image processing unit；Described image collector is transmitted to image pick-up card to acquire the realtime graphic of rotating vane and casing；Described image capture card is used to the signal received being converted to digital signal, and is transmitted to image processing unit；Described image processing unit is used to that the image received to be carried out image procossing and be calculated, while obtaining tested rotary blade tip clearance and blade rotational speed.The present invention measures accurately and number of sensors needed for measurement is few, can be used for the real-time measurement of rotating machinery impeller clearance and rotating speed, has broad application prospects.
Description
Technical field
The present invention relates to field of measuring technique more particularly to a kind of rotating machinery tip clearance and blade rotational speed composite measurements
System and method, image processing program.
Background technology
The tip clearance of rotating machinery blade generally refers to the radial distance between rotary machine rotor blade and casing, rotation
Mechanical separator speed is generally referred to as the number of turns that rotating machinery is rotated around the center of circle in the unit interval, and tip clearance is to influence rotation with rotating speed
Two important parameters of mechanical performance.By typical rotating machinery --- for aero-engine, when between aero-engine blade tip
When gap is excessive, the pressure ratio of compressor declines, and fuel consumption increases, and the efficiency of engine can also substantially reduce.However tip clearance mistake
Hour, it is expanded since blade is heated under high temperature environment, may result in and generate friction between blade tip and casing inner wall, make
At the damage of parts, the safety of engine is influenced；Meanwhile the size of aero-engine rotating speed determines engine blade intensity
With the size of turbine inlet temperature, and motor power approximation is directly proportional to the cube of rotating speed, so either pacifying from engine
In terms of row for the national games or from engine performance, rotating speed is all the most basic and more important control of aero-engine
Amount processed.To sum up, the tip clearance and blade rotational speed for reasonably designing and monitoring engine have weight for improving engine performance
Want meaning.The example by image processing techniques on rotating machinery clearance measurement and tachometric survey respectively existing at present, but it is general
Store-through in some disadvantages and problem, and there is presently no a kind of method can by based on image processing techniques clearance measurement with turn
Speed measures the example to combine.
Chinese patent 201210455748.1 discloses " method and its system that measure engine tip clearance ", this method
The image of casing and blade tip is shot by figure collector, and data analysis is carried out by host computer and obtains each blade of the engine
Blade tip is the same as the gap between casing；Simultaneously according to the angular transducer being mounted in shaft, associated gap value pair is also measured in due course
The angle information answered；Finally according to camera calibration information, the conversion between pixel and physical distance is completed.But this method needs
Want two sensors, i.e. camera and angular-rate sensor.Wherein angular-rate sensor is mounted on an axle, and is contact type measurement, is deposited
In some problems, and angular-rate sensor is only applicable in low engine speed range, is unable to measure high rotating speed object；If between different sensors
Communication failure occurs or traffic rate is different, then can not determine the angle information for the gap width measured；And this method only for
Clearance measurement.
Chinese patent 200610029122.9 discloses " rotation-speed measuring device based on computer vision ", and this method passes through
The acquisition of vision collecting device is mounted on the motion blur image of testee on the platform that tests the speed, and the blurred picture obtained is believed
Breath transmission computer system.By carrying out movement dimension-reduction treatment to blurred picture, time-frequency conversion, spectrum analysis, kinematic parameter obtain
It the operations such as takes, extracts the tachometer value of testee.But this method is only applicable to the relatively low situation of rotating speed, is sampled according to Shannon
Law, when testee rotating speed is higher, this method measurement will produce distortion；And this method is only for tachometric survey.
Include the bulk information including rotor tip-clearance and rotor speed due to rotary machine rotor high frequency imaging, so
It is feasible to develop a kind of rotating machinery tip clearance based on image processing techniques and blade rotational speed Integrated Measurement System.Pass through
Processing to single-frame images can extract the relevant information of rotor tip-clearance；By carrying time identifier image to a series of
Processing, the relevant information of rotor speed can be extracted.In order to reduce rotating machinery number of sensors and weight, single biography is realized
Sensor measures the target of a variety of variables, has invented a kind of rotating machinery tip clearance and blade rotational speed based on image processing techniques
Integrated Measurement System.
Invention content
The object of the present invention is to provide a kind of rotating machinery tip clearance and blade rotational speed based on image processing techniques
Integrated Measurement System and method, image processing program, can be merely with a high frequency imaging collector, while measuring rotating machinery
Tip clearance and rotating speed.Its is simple in structure, easy to install and use, high certainty of measurement, can be used for measuring rotating machinery leaf in real time
Intercuspal space and rotating speed, development prospect are wide.
The present invention uses following technical scheme to achieve the above object：
A kind of rotating machinery tip clearance and blade rotational speed Integrated Measurement System, including image acquisition device, image pick-up card,
Image processing unit；Described image collector is transmitted to acquire the realtime graphic of rotating vane tip segment and casing
Image pick-up card；Described image capture card is used to the signal received being converted to digital signal, and is transmitted to image procossing list
Member；Described image processing unit is used to that the image received to be carried out image procossing and be calculated, while obtaining tested rotary blade
Tip clearance and blade rotational speed.
Preferably, the sample frequency of described image collector meets Shannon's sampling theorem, i.e., per second at least to acquireFrame image, wherein N are the rotating speed of rotating machinery, and X is the number of blade installed on rotating machinery.
Preferably, described image processing unit includes Image Acquisition and preprocessing module, rotation speed measuring module, clearance measurement
Module；Described image is acquired is converted to gray level image with preprocessing module by the collected each frame RGB image of image acquisition device,
And gray value of the specific pixel point in each frame gray level image is taken to receive the frame gray scale with preprocessing module with Image Acquisition
The time composition data queue of image, the specific pixel point are any that image acquisition device acquires blade tip segment in image
Pixel, and this data queue is sent to rotation speed measuring module；The rotation speed measuring module to the data queue that receives into
Row processing and calculating, obtain the tachometer value of rotating machinery；Described image acquire with preprocessing module monitor in real time Image Acquisition with
Communication between preprocessing module and rotation speed measuring module, when gray scale value mutation, communication queue triggering, Image Acquisition is located with pre-
Current collected single frames gray level image is sent to clearance measurement module by reason module；The clearance measurement module is to receiving
Single frames gray level image is handled and is calculated, and obtains the physical width in gap.
Preferably, described image processing unit further includes image display；Described image acquires real with preprocessing module
When transmit the image collected to image display, the tachometer value being calculated is sent to image by the rotation speed measuring module
The gap physical width being calculated is sent to image display by display module, the clearance measurement module；Described image
Display module is shown comprising interstitial site, physical width, the video image of rotary speed information.
A kind of rotating machinery tip clearance and blade rotational speed comprehensive measuring method, include the following steps：
Step 1：Described image collector demarcates the corresponding pass between the physical width and the pixel value of gap width in gap
System obtains calibration information；
Step 2：Described image collector acquires rotating vane tip segment and casing realtime graphic, and is transmitted to image and adopts
Truck；
Step 3：The signal received is converted to digital signal by described image capture card, and be transmitted to Image Acquisition with it is pre-
Processing module；
Step 4：Described image acquires and image acquisition device is collected each frame RGB image and is converted to ash by preprocessing module
Image is spent, and gray value of the specific pixel point in each frame gray level image is taken to receive this with preprocessing module with Image Acquisition
The time composition data queue of frame gray level image, and this data queue is sent to rotation speed measuring module；
Step 5：The rotation speed measuring module is handled and is calculated to the data received, and the rotating speed of rotating machinery is obtained
Value；
Step 6：Image Acquisition monitors Image Acquisition and preprocessing module and rotation speed measuring module in real time with preprocessing module
Between communication, when gray scale value mutation, communication queue triggering, Image Acquisition and preprocessing module will current collected single frames
Gray level image is sent to clearance measurement module, and the clearance measurement module is handled and counted to the single frames gray level image received
It calculates, obtains the pixel value of gap width, then Image Acquisition accesses described image collector with preprocessing module and obtains calibration letter
Breath, finds the physical width in the corresponding gap of pixel value of gap width, to obtain the physical width in gap.
Preferably, the step of calculating of rotation speed measuring module described in step 5 rotating speed includes：
Step 5.1：Setting updates a tachometer value per the T moment, the data team that Image Acquisition and preprocessing module are sent
Column split is the array [(h that time span is Ta,ta),(ha+1,ta+1),…,(hb,tb)], wherein tb-ta≈T；
Step 5.2：By the gray value extraction in above-mentioned array, composition gray scale array [ha,ha+1,…,hb]；
Step 5.3：The sampling time is taken to beFast Fourier Transform (FFT) is carried out to gray scale array, and is extracted most
The corresponding frequency f of amplitude；
Step 5.4：Tachometer value N is obtained according to frequency f and number of blade X,
Preferably, the step of physical width of the calculating of clearance measurement module described in step 6 tip clearance includes：
Step 6.1：Noise reduction process is carried out to single frames gray level image, obtains the higher image of signal-to-noise ratio；
Step 6.2：Edge extracting is carried out to image, obtains edge image；
Step 6.3：Hough transform (Hough transformation) is carried out to edge image, the threshold value of Hough transform is continuously improved, directly
It is returned only to two parallel or approximately parallel straight lines to Hough transform；
Step 6.4：According to the straight line information that Hough transform returns, the pixel value of calculated gap；
Hough transform returns to the information of straight line：[[dl1,θl1],[dl2,θl2]]
D is intercept, and unit is pixel value, and θ is angle；Subscript l1 is straight line, and subscript l2 is Article 2 straight line.
Then pixel value is：
Wherein：Δ θ=θl1-θl2。
Step 6.5：Between the physical width in the corresponding gap of pixel value in gap is found according to the calibration information to get going out
The physical width of gap.
A kind of image processing program, including host process, Image Acquisition and pretreatment subprocess, tachometric survey subprocess,
Gap measures subprocess；The host process creates communication queue between each subprocess and each subprocess；Described image acquires and pre- place
The each frame RGB image received is converted to gray level image by reason subprocess, and takes specific pixel point in each frame gray level image
In gray value and Image Acquisition receive the time composition data queue of the frame gray level image with pretreatment subprocess, and this is counted
It is sent to tachometric survey subprocess according to queue；The tachometric survey subprocess carries out fast Fourier change to the data received
It changes, obtains frequency values, line frequency of going forward side by side-rotating speed conversion obtains the tachometer value of rotating machinery；Described image acquires and pretreatment
Process monitors Image Acquisition and pre-processes the communication between subprocess and tachometric survey subprocess in real time, when gray scale value mutation,
Communication queue triggers, and current collected single frames gray level image is sent to clearance measurement by Image Acquisition with pretreatment subprocess
Process；The clearance measurement subprocess carries out noise reduction, edge extracting, Hough transform etc. to the single frames gray level image received
Reason, calculates the pixel value in gap, the pixel value then in conjunction with gap and the correspondence between the physical width in gap first
Obtain the physical width in gap.
Preferably, further include that image shows subprocess；Described image acquire with pretreatment subprocess, tachometric survey into
Journey, clearance measurement subprocess and described image show that the communication between subprocess is respectively：Image Acquisition and pretreatment subprocess
Real-time Transmission the image collected to image shows that subprocess, the tachometric survey subprocess send the tachometer value being calculated
To image show subprocess, the clearance measurement subprocess by the gap physical width being calculated be sent to image display son into
Journey；Described image shows that subprocess shows the video image comprising interstitial site, physical width, rotary speed information.
Advantageous effect：
First, the present invention is rotating machinery tip clearance and blade rotational speed Integrated Measurement System based on image processing techniques,
Can be merely with a high frequency imaging collector, while rotating machinery tip clearance and rotating speed are measured, reduce rotating machinery biography
Sensor quantity and weight realize that single-sensor measures the target of a variety of variables.
Second is that using the method for operation of multi-process with Computer Image Processing program of the present invention, on the one hand, multi-process
The method of operation can utilize the computing capability of computer processor to greatest extent, the speed of image procossing can be greatly improved, together
When also for parallel multiprocessor calculating facility is provided；On the other hand, the method for operation of multi-process is conducive to image processing program
Expand application, if such as expand blade oscillation measurement on the basis of tip clearance and blade rotational speed measure, only need to write leaf
The subprocess of piece vibration measurement, and define interface and communication queue, you can it is added directly into Computer Image Processing program.
Third, the present invention real-time display can be tested the image of leaf dish on computers, user can monitor tested leaf dish
Operating condition, if accident occurs, user can pass through the image of real-time display and carry out preliminary fault diagnosis.
Description of the drawings
Fig. 1 is Image Acquisition structural schematic diagram.
Fig. 2 is Computer Image Processing program structure diagram.
In attached drawing 1, parts list represented by the reference numerals are as follows：
1：Computer；2：Image pick-up card；3：High frequency imaging collector；4：Rotating machinery casing；5：Rotating machinery blade；
6：Data line.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawings to embodiment of the present invention
It is described in further detail.
Fig. 1 shows Image Acquisition structural schematic diagram of the present invention, including：High frequency imaging collector 3, the high frequency imaging are adopted
Storage 3 can be CCD camera, or other types of image acquisition device, high frequency imaging collector 3 are rotated for acquiring
The high frequency imaging of mechanical rotating vane and casing；Image pick-up card 2, described image capture card 2 acquire high frequency imaging collector 3
To image be converted to digital signal, and be further processed by computer bus real-time Transmission to computer 1.
When it is implemented, installing high frequency imaging collector first, the setting of related initial parameter is carried out, it is ensured that high frequency figure
As collector can obtain clearly image, computer can receive the transformed digital signal of image pick-up card；Again to height
Frequency image acquisition device is demarcated, and the relationship between pixel and physical distance is obtained.Physical distance refers to gap (blade top
Gap between portion and casing) physical width.For example, when physical clearance be respectively 1mm, 2mm, 3mm ... when, in high frequency figure
As in collector the image collected, the pixel value of gap width is respectively 20,40,60 ....Bid then can be obtained according to this relationship
Determine information.
Fig. 2 shows Computer Image Processing program structure diagrams of the present invention, as shown in Fig. 2, Computer Image Processing program
Host process creates each subprocess and interprocess communication queue.1. shown subprocess is Image Acquisition and pretreatment subprocess, be used for
It drives high frequency imaging collector to obtain high frequency imaging, and high frequency imaging is simply pre-processed；2. shown subprocess is rotating speed
Subprocess is measured, for carrying out Fast Fourier Transform (FFT) to the data received, obtains frequency values, line frequency-rotating speed of going forward side by side turns
It changes, obtains the tachometer value of rotating machinery；Shown subprocess 3. be clearance measurement subprocess, for the single-frame images to receiving into
The processing such as row noise reduction, edge extracting, Hough transform calculate the pixel value in gap, convert then in conjunction with calibration information first
Go out the physical width in gap；4. shown subprocess is that image shows subprocess, for showing comprising interstitial site, physical width,
The video image of rotary speed information.
Detailed description are as follows for each subprocess：
1. Image Acquisition and pretreatment subprocess
Image Acquisition, for opening computer data port, receives to be transmitted to meter by image pick-up card with pretreatment subprocess
The image digital signal of calculation machine.The picture format that Image Acquisition is received with pretreatment subprocess is rgb format.Due to gap with
Blade and casing edge, blade edge differ larger with gray value of the blade surface in gray level image, and computer disposal ash
It is fast more than processing RGB image to spend speed image, so Image Acquisition is first converted image by rgb format with pretreatment subprogram
For grayscale format.While Image Acquisition receives image with pretreatment subprocess, record receives accurate system time when image,
And it is stored in the same array with image.
Image Acquisition has communication with pretreatment subprocess with other each subprocess.Image Acquisition with pretreatment subprocess with
When tachometric survey subprocess communicates, by gray value of the specific pixel point in each frame image system corresponding with each frame image
Time composition data queue, is sent to tachometric survey subprocess.For example, it is h that the i-th frame, which selectes pixel gray value,i, Image Acquisition
When receiving the i-th frame image with pretreatment subprocess, the system time of record is ti, then Image Acquisition and pretreatment subprocess transmission
Data format to tachometric survey subprocess is：[(h1,t1),(h2,t2),…,(hi,ti),…]；Image Acquisition and pretreatment
When process is communicated with clearance measurement subprocess, Image Acquisition with pretreatment subprocess monitor in real time Image Acquisition with pretreatment son into
Communication between journey and tachometric survey subprocess, when gray scale value mutation, communication queue triggering, Image Acquisition with pretreatment son into
Current collected single frames gray level image is sent to clearance measurement subprocess by journey；Image Acquisition and pretreatment subprocess and image
When showing subprocess communication, Image Acquisition and pretreatment subprocess are straight by the collected grayscale format image of high frequency imaging collector
It receives and sends to image and shows subprocess.
2. tachometric survey subprocess
Tachometric survey subprocess receives Image Acquisition and pre-processes the [(h of subprocess transmission1,t1),(h2,t2),…,(hi,
ti) ...] data of format.If user's setting updates a tachometer value per the T moment, tachometric survey subprocess calculates rotating speed
Method is as follows：First, it is the array [(h that time span is T with the Interval data that subprocess is sent is pre-processed by Image Acquisitiona,
ta),(ha+1,ta+1),…,(hb,tb)], wherein tb-ta≈T；Secondly, the gray value in above-mentioned array is extracted, forms new number
Group [ha,ha+1,…,hb]；Then the sampling time is taken to beFast Fourier Transform (FFT) is carried out to gray scale array, and
Extract the corresponding frequency f of maximum amplitude；Finally, tachometer value N is obtained according to frequency f and number of blade X,
When tachometric survey subprocess shows that subprocess communicates with image, every the T moment, tachometric survey subprocess will calculate
The tachometer value gone out is sent to image and shows subprocess.
3. clearance measurement subprocess
When Image Acquisition is sent to the gray value mutation of tachometric survey subprocess with pretreatment subprocess, i.e. hi+1-
hi＞ hsetWhen (hsetFor empirical parameter, need manual setting), clearance measurement subprocess receive Image Acquisition with pretreatment son into
The single-frame images that journey is sent, and flag bit is added 1 certainly, when flag bit is more than the number of blade, mark position 1.The work of flag bit
With to determine the corresponding blade of single-frame images, for example, after the single-frame images that Image Acquisition is sent with pretreatment subprocess, indicate
The value of position is k, then this single-frame images corresponds to kth blade.Clearance measurement subprocess is calculated using single frames gray level image between blade tip
The step of gap, is as follows：First, noise reduction process is carried out to image, obtains the higher image of signal-to-noise ratio；Secondly, edge is carried out to image
Extraction, obtains edge image；Then, using Hough transform, the threshold value of Hough transform is continuously improved, until Hough transform is only
Return to two parallel or approximately parallel straight lines；Then the straight line information returned according to Hough transform, the pixel of calculated gap
Value；Finally according to the calibration information of the pixel value in gap and high frequency imaging collector, the physical width in gap is calculated.
The physical meaning for two straight lines that Hough transform returns is two boundary lines in gap.What Hough transform returned
Two straight line information include the intercept and angle of two straight lines respectively, and the intercept of cathetus is as unit of pixel.In conjunction with two
The angle information of straight line, you can the pixel value between two straight lines is obtained according to intercept information.
Hough transform returns to the information of straight line：[[dl1,θl1],[dl2,θl2]]
D is intercept, and unit is pixel value, and θ is angle；Subscript l1 is straight line, and subscript l2 is Article 2 straight line.
Pixel value is：
Wherein：Δ θ=θl1-θl2
θ under normal conditionsl1≈θl2, i.e. Δ θ ≈ 0,
When clearance measurement subprocess shows that subprocess communicates with image, clearance measurement subprocess returns to Hough transform
Straight line information is sent to image with calculated physical width and shows subprocess.
4. image shows subprocess
Image shows that subprocess is collected in real time from Image Acquisition and pretreatment subprocess acquisition high frequency imaging collector
Image, tachometer value is obtained from tachometric survey subprocess, and linear position information and physical width are obtained from clearance measurement subprocess.Figure
Picture shows that the main function of subprocess is, on a computer display by the presentation of information received from other subprocess.
Single high frequency imaging collector can be used only in technical solution disclosed in above example, while on-line measurement rotates
Mechanical tip clearance and blade rotational speed ensure rotating machinery safe and stable operation, improve for mitigating the rotating machinery weight of attachment
The efficiency of rotating machinery is of great significance.But it is not limited to this, i.e. the technological thought the foregoing is merely the present invention, and does not have to
To limit the present invention, all within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should all wrap
Containing within protection scope of the present invention.
Claims (9)
1. a kind of rotating machinery tip clearance and blade rotational speed Integrated Measurement System, which is characterized in that including image acquisition device, figure
As capture card, image processing unit；Described image collector to acquire the realtime graphic of rotating vane tip segment and casing,
And it is transmitted to image pick-up card；Described image capture card is used to the signal received being converted to digital signal, and is transmitted to figure
As processing unit；Described image processing unit is used to that the image received to be carried out image procossing and be calculated, while obtaining tested
Rotary blade tip clearance and blade rotational speed.
2. a kind of rotating machinery tip clearance according to claim 1 and blade rotational speed Integrated Measurement System, feature exist
In the sample frequency of described image collector meets Shannon's sampling theorem, i.e., per second at least to acquireFrame image,
Middle N is the rotating speed of rotating machinery, and X is the number of blade installed on rotating machinery.
3. a kind of rotating machinery tip clearance according to claim 1 and blade rotational speed Integrated Measurement System, feature exist
In described image processing unit includes Image Acquisition and preprocessing module, rotation speed measuring module, clearance measurement module；The figure
The collected each frame RGB image of image acquisition device is converted into gray level image with preprocessing module as acquiring, and takes specific picture
Gray value of the vegetarian refreshments in each frame gray level image receives the time of the frame gray level image with Image Acquisition with preprocessing module
Composition data queue, and this data queue is sent to rotation speed measuring module；The rotation speed measuring module is to the data that receive
Queue is handled and is calculated, and the tachometer value of rotating machinery is obtained；Described image is acquired monitors image in real time with preprocessing module
Acquisition and the communication between preprocessing module and rotation speed measuring module, when gray scale value mutation, communication queue triggering, Image Acquisition
Current collected single frames gray level image is sent to clearance measurement module with preprocessing module；The clearance measurement module docking
The single frames gray level image received is handled and is calculated, and obtains the physical width in gap.
4. a kind of rotating machinery tip clearance according to claim 3 and blade rotational speed Integrated Measurement System, feature exist
In described image processing unit further includes image display；Described image acquisition is collected with preprocessing module real-time Transmission
Image to image display, the tachometer value being calculated is sent to image display by the rotation speed measuring module, institute
It states clearance measurement module and the gap physical width being calculated is sent to image display；Described image display module is shown
Including interstitial site, physical width, the video image of rotary speed information.
5. a kind of rotating machinery tip clearance based on system described in claim 3 and blade rotational speed comprehensive measuring method, special
Sign is, includes the following steps：
Step 1：Described image collector demarcates the correspondence between the physical width and the pixel value of gap width in gap, obtains
To calibration information；
Step 2：Described image collector acquires rotating vane tip segment and casing realtime graphic, and is transmitted to Image Acquisition
Card；
Step 3：The signal received is converted to digital signal by described image capture card, and is transmitted to Image Acquisition and pretreatment
Module；
Step 4：Described image acquires and image acquisition device is collected each frame RGB image and is converted to gray-scale map by preprocessing module
Picture, and gray value of the specific pixel point in each frame gray level image is taken to receive frame ash with Image Acquisition and preprocessing module
The time composition data queue of image is spent, and this data queue is sent to rotation speed measuring module；
Step 5：The rotation speed measuring module is handled and is calculated to the data received, and the tachometer value of rotating machinery is obtained；
Step 6：Image Acquisition and preprocessing module are monitored between Image Acquisition and preprocessing module and rotation speed measuring module in real time
Communication, when gray scale value mutation, communication queue triggering, Image Acquisition and preprocessing module will current collected single frames gray scales
Image is sent to clearance measurement module, and the clearance measurement module is handled and calculated to the single frames gray level image received,
Obtain the pixel value of gap width, then Image Acquisition accesses described image collector with preprocessing module and obtains calibration information,
The physical width for finding the corresponding gap of pixel value of gap width, to obtain the physical width in gap.
6. a kind of rotating machinery tip clearance according to claim 5 and blade rotational speed Integrated Measurement System, feature exist
Include in the step of, rotation speed measuring module described in step 5 calculates rotating speed：
Step 5.1：Setting updates a tachometer value per the T moment, the data queue point that Image Acquisition and preprocessing module are sent
It is divided into the array [(h that time span is Ta,ta),(ha+1,ta+1),…,(hb,tb)], wherein tb-ta≈T；
Step 5.2：By the gray value extraction in above-mentioned array, composition gray scale array [ha,ha+1,…,hb]；
Step 5.3：The sampling time is taken to beFast Fourier Transform (FFT) is carried out to gray scale array, and is extracted most substantially
It is worth corresponding frequency f；
Step 5.4：Tachometer value N is obtained according to frequency f and number of blade X,
7. a kind of rotating machinery tip clearance according to claim 5 and blade rotational speed Integrated Measurement System, feature exist
Include in the step of, clearance measurement module described in step 6 calculates the physical width of tip clearance：
Step 6.1：Noise reduction process is carried out to single frames gray level image, obtains the higher image of signal-to-noise ratio；
Step 6.2：Edge extracting is carried out to image, obtains edge image；
Step 6.3：Hough transform is carried out to edge image, the threshold value of Hough transform is continuously improved, until Hough transform is only returned
Return two parallel or approximately parallel straight lines；
Step 6.4：According to the straight line information that Hough transform returns, the pixel value of calculated gap；
Hough transform returns to the information of straight line：[[dl1,θl1],[dl2,θl2]],
D is intercept, and unit is pixel value, and θ is angle；Subscript l1 is straight line, and subscript l2 is Article 2 straight line,
Then pixel value is：
Wherein：Δ θ=θl1-θl2；
Step 6.5：The physical width in the corresponding gap of pixel value in gap is found according to the calibration information to get gap is gone out
Physical width.
8. a kind of image processing program, which is characterized in that including host process, Image Acquisition and pretreatment subprocess, tachometric survey
Subprocess, clearance measurement subprocess；The host process creates communication queue between each subprocess and each subprocess；Described image
The each frame RGB image received is converted to gray level image by acquisition with pretreatment subprocess, and takes specific pixel point each
Gray value in frame gray level image receives the time composition data team of the frame gray level image with Image Acquisition with pretreatment subprocess
Row, and this data queue is sent to tachometric survey subprocess；The tachometric survey subprocess carries out the data received fast
Fast Fourier transformation, obtains frequency values, and line frequency of going forward side by side-rotating speed conversion obtains the tachometer value of rotating machinery；Described image acquires
Image Acquisition is monitored in real time with pretreatment subprocess and pre-processes the communication between subprocess and tachometric survey subprocess, works as gray scale
When value mutation, current collected single frames gray level image is sent to by communication queue triggering, Image Acquisition with pretreatment subprocess
Clearance measurement subprocess；The clearance measurement subprocess to the single frames gray level image that receives carry out noise reduction, edge extracting,
The processing such as Hough transform calculate the pixel value in gap first, the physical width of pixel value and gap then in conjunction with gap it
Between correspondence obtain the physical width in gap.
9. a kind of image processing program according to claim 8, which is characterized in that further include that image shows subprocess；Institute
State Image Acquisition and pretreatment subprocess, tachometric survey subprocess, clearance measurement subprocess and described image display subprocess it
Between communication be respectively：Image Acquisition shows subprocess, institute with pretreatment subprocess real-time Transmission the image collected to image
It states tachometric survey subprocess and the tachometer value being calculated is sent to image display subprocess, the clearance measurement subprocess will be counted
The gap physical width obtained is sent to image and shows subprocess；Described image show subprocess show include interstitial site,
The video image of physical width, rotary speed information.
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