CN107085149A - Introduce the material microwave parameter system for accurately testing and method of machine vision technique - Google Patents
Introduce the material microwave parameter system for accurately testing and method of machine vision technique Download PDFInfo
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- CN107085149A CN107085149A CN201710284524.1A CN201710284524A CN107085149A CN 107085149 A CN107085149 A CN 107085149A CN 201710284524 A CN201710284524 A CN 201710284524A CN 107085149 A CN107085149 A CN 107085149A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2617—Measuring dielectric properties, e.g. constants
- G01R27/2623—Measuring-systems or electronic circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1223—Measuring permeability, i.e. permeameters
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Abstract
The present invention provides a kind of material microwave parameter system for accurately testing for introducing machine vision technique, including image acquisition and processing subsystem and material microwave parameter testing subsystem；Carrying out the method accurately tested of material microwave parameter is：Each microcam is demarcated first, solve the spin matrix and motion vector between each coordinate system and self-defined global coordinate system, sample image data is obtained by multiple cameras, utilize the spin matrix and motion vector between each coordinate system and global coordinate system, calculate the true location coordinate and change in shape amount of sample three-dimensional coordinate and specimen material in test fixture, and function coefficients in testing algorithm or solve domain and be modified, further improve measuring accuracy；The present invention can accurately obtain sample position and metamorphosis in real time, without influenceing microwave material test；The influence that sample position skew and change in shape are caused to test result can be effectively reduced, measuring accuracy is further improved.
Description
Technical field
The invention belongs to microwave, millimeter wave material electromagnetic parameter test technical field, more particularly to machine vision technique,
Material microwave parameter system for accurately testing and method of testing.
Background technology
Microwave material is widely used in microwave communication, radar invisible, microwave circuit, remote control as the transmission ature of coal of microwave
The every field such as remote measurement.Various microwave materials are correctly used, accurately know that its dielectric constant is most important.Material microwave
Parameter is general to be obtained by testing, and only accurate test result can evaluate the quality of material actual performance, be that system is set
Prepared by meter and material provides effective reference data.In material microwave parameter test system, sample usually requires to be placed in test
In fixture, cause testing sample metamorphosis, visually can not accurately observe, i.e., be tested using free-space Method, also can not be accurate
Calculate sample shape and location variation.Especially when sample and test fixture size are inconsistent, sample is difficult to protect in fixture
Hold and be disposed vertically, and the inclination of sample can give calibration tape to carry out extra error, and every time the difference of sample state to test result
Influence it is also different, ultimately result in test uniformity and be deteriorated with repeated.
In traditional microwave material testing art, cause error to eliminate sample position and change in shape, generally utilize warp
Test coefficient or standard sample be modified to test result, but bad to different sample tests uniformity, and it is theoretical according to
According to shortcoming.Meanwhile, the test error that inclination is caused is placed to reduce sample, on the one hand testing sample section and chucking surface is improved
Flatness；On the other hand using the more identical test fixture of longer sample and size, but be the increase in sample waste and
Different fixtures are needed to various sizes of sample, less effective is tested, test flexibility is poor.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of machine vision technique that introduces
Material microwave parameter system for accurately testing and method of testing.
For achieving the above object, technical solution of the present invention is as follows：
A kind of material microwave parameter system for accurately testing for introducing machine vision technique, including image acquisition and processing subsystem
With material microwave parameter testing subsystem；
Described image acquisition process subsystem includes computer, multiple microcams, and each microcam leads to respectively
Cross data line and be connected to computer, described multiple microcams are respectively and fixedly installed on test fixture；
The material microwave parameter testing subsystem includes Network Analyzer, computer, test fixture；Network Analyzer and
Computer is connected by netting twine, and the port1 of Network Analyzer passes through the first port of microwave transmission line connecting test fixture, network
The second port that the port2 of analyzer passes through microwave transmission line jockey.
It is preferred that, each camera is evenly distributed on fixture, the distance phase of each camera to testing sample
Deng.
It is preferred that, in addition to the LED/light source above testing sample.
It is preferred that, a diameter of 2mm of camera.Because the size of microcam is smaller, to test fixture
The influence of performance is just smaller.
For achieving the above object, the present invention is also provided one kind and accurately surveyed using said system progress material microwave parameter
The method of examination, is demarcated to each microcam first, is solved between each subcoordinate system and self-defined global coordinate system
Spin matrix and motion vector, by multiple cameras obtain sample image data, utilize each coordinate system and world coordinates
Spin matrix and motion vector between system, calculate the true position of sample three-dimensional coordinate and specimen material in test fixture
Put coordinate and change in shape amount, and function coefficients in testing algorithm or solve domain and be modified, further improve measuring accuracy.
Each video camera has the coordinate system of oneself, and microcam is demarcated, seeks to set up each video camera
Coordinate system and customized global coordinate system between relation, that is, each video camera subcoordinate system and global coordinate system it
Between spin matrix and motion vector.
It is preferred that, methods described further comprises following steps：
1) connecting test system：Microwave transmission line is connected to the port1 of Network Analyzer and the first end of test fixture
It is connected between mouthful, by microwave transmission line between the port2 of Network Analyzer and the second port of test fixture, connection network point
Analyzer and computer, data line are connected on minisize pick-up head；
2) cyber-net analyzer is opened, testing sample size is measured, and record；
3) test software is opened, calibration data during sample is not placed in test；
4) in the case where not placing sample, microcam is demarcated；
5) testing sample is placed in test fixture, and by Network Analyzer and test software, obtains and place sample
Test data afterwards；
6) sample image data is obtained by microcam, and the three-dimensional of sample is calculated using image processing software and sat
Mark and change in shape amount；
7) image processing data is imported into test software, and input sample size, with reference to the calibration data tested before and
The test data after sample is placed, microwave parameters of the specimen material under different frequency point are calculated.
It is preferred that, if test result is inaccurate, repeat step (3)-(7).
The material microwave parameter includes：Complex dielectric permittivity, magnetic conductivity, surface resistivity etc..
Machine vision technique is demarcated firstly the need of to multiple video cameras, obtains each camera coordinate system and global seat
Spin matrix and motion vector between mark system, that is, set up the functional relation of image coordinate and self-defined world coordinates, and utilize
Image processing algorithm, actual three-dimensional coordinate is converted to by the image coordinate of target, and the accurate position of specimen material is calculated with this
With change in shape amount.In test process, sample position skew or change in shape are shown in that accompanying drawing 2 (is said with cylindrical sample
Bright, other shapes sample is similar), wherein left figure is sample in the coordinate system in the case of hypothesis testing, and right figure is actual test ring
Sample in coordinate system under border, according to the accurate location and shape variable quantity of specimen material, is solved to the function in testing algorithm
Domain is modified, and accurately calculates the parameter of specimen material.
Beneficial effects of the present invention are：1) machine vision technique is applied in traditional microwave testing of materials, can be accurate in real time
Sample position and metamorphosis are really obtained, without influenceing microwave material test；
2) machine vision view data is utilized, corresponding testing algorithm is modified, sample position can be effectively reduced inclined
The influence caused with change in shape to test result is moved, measuring accuracy is further improved；
3) testing sample profile and test environment are required to reduce, reduces sample process time, while reducing due to sample
The test that placement is tilted or profile is irregularly caused is inaccurate；
4) it is applied to various different specification sizes and different types of sample, and has higher measuring accuracy.
Brief description of the drawings
Fig. 1 is the test system structure figure of the present invention.
Fig. 2 is the preferable testing sample and actual testing sample under same integration coordinate system.
Wherein, 1 is Network Analyzer, and 1a and 1b are the port1 and port2 of Network Analyzer, and 2 be computer, and 3 be test
Fixture, 3a and 3b are the first port and second port of test fixture, and 4a-4d is microcam, and 5 be LED/light source, 6a and 6b
It is microwave transmission line, 7 be data line, and 8 be netting twine, and 9 be testing sample.
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
A kind of material microwave parameter system for accurately testing for introducing machine vision technique, including image acquisition and processing subsystem
With material microwave parameter testing subsystem；
Described image acquisition process subsystem includes computer 2, multiple microcam 4a-4d, each microcam
Computer 2 is connected to by data line 7 respectively, described multiple microcams are respectively and fixedly installed to test fixture 3
On；
The material microwave parameter testing subsystem includes Network Analyzer 1, computer 2, test fixture 3；Network analysis
Instrument 1 and computer 2 are connected by netting twine 8, the port1 of Network Analyzer 1 pass through microwave transmission line 6a connecting tests fixture 3
The second port 3b that Single port 3a, the port2 of Network Analyzer 1 pass through microwave transmission line 6b jockeies 3.
Each camera is evenly distributed on fixture, and the distance of each camera to testing sample is equal.
LED/light source 5 is provided with above testing sample.
The size of microcam is smaller, and the influence to test fixture performance is just smaller, based on in the market video camera
Understand, the camera is from the minimum 2mm of diameter.
The method that material microwave parameter is accurately tested is carried out using said system, rower is entered to each microcam first
It is fixed, the spin matrix and motion vector between each subcoordinate system and global coordinate system are solved, sample is obtained by multiple cameras
Product view data, using the spin matrix and motion vector between each coordinate system and global coordinate system, calculates sample three-dimensional
The true location coordinate and change in shape amount of coordinate and specimen material in test fixture, and the function coefficients in testing algorithm
Or solution domain is modified, and further improves measuring accuracy.
Each video camera has the coordinate system of oneself, and microcam is demarcated, seeks to set up each video camera
Coordinate system and customized world coordinates between relation, that is, between each video camera subcoordinate system and global coordinate system
Spin matrix and motion vector.
Specifically, methods described comprises the following steps：
1) connecting test system：Microwave transmission line 6a is connected to the of the port1 of Network Analyzer 1 and test fixture 3
Be connected between Single port 3a, by microwave transmission line 6b Network Analyzer 1 port2 and test fixture 3 second port 3b it
Between, connection Network Analyzer and computer, data line 7 are connected on minisize pick-up head 4a-4d；
2) computer 2 and Network Analyzer 1 are opened, the size of testing sample 9 is measured, and record；
3) test software is opened, calibration data during sample is not placed in test；
4) in the case where not placing sample, microcam 4a-4d is demarcated；
5) testing sample 9 is placed in test fixture 3, and by Network Analyzer and test software, obtains and place sample
Test data after product；
6) sample image data is obtained by microcam 4a-4d, and sample is calculated using image processing software
Three-dimensional coordinate and change in shape amount；
7) image processing data is imported into test software, and input sample size, with reference to the calibration data tested before and
The test data after sample is placed, microwave parameters of the specimen material under different frequency point are calculated.
If test result is inaccurate, repeat step (3)-(7).
The material microwave parameter includes：Complex dielectric permittivity, magnetic conductivity, surface resistivity etc..
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, all those of ordinary skill in the art without departing from disclosed spirit with being completed under technological thought
All equivalent modifications or change, should by the present invention claim be covered.
Claims (7)
1. a kind of material microwave parameter system for accurately testing for introducing machine vision technique, it is characterised in that：Including IMAQ
Processing subsystem and material microwave parameter testing subsystem；
Described image acquisition process subsystem includes computer (2), multiple microcams (4a-4d), each microcam
Computer (2) is connected to by data line (7) respectively, described multiple microcams are respectively and fixedly installed to test clip
Have on (3)；
The material microwave parameter testing subsystem includes Network Analyzer (1), computer (2), test fixture (3)；Network point
Analyzer (1) and computer (2) are connected by netting twine (8), and the port1 (1a) of Network Analyzer (1) passes through microwave transmission line (6a)
The first port (3a) of connecting test fixture (3), the port2 (1b) of Network Analyzer (1) is connected by microwave transmission line (6b)
The second port (3b) of fixture (3).
2. the material microwave parameter system for accurately testing according to claim 1 for introducing machine vision technique, its feature exists
In：Each camera is evenly distributed on fixture, and the distance of each camera to testing sample is equal.
3. the material microwave parameter system for accurately testing according to claim 1 for introducing machine vision technique, its feature exists
In：Also include the LED/light source (5) above testing sample.
4. the material microwave parameter system for accurately testing according to claim 1 for introducing machine vision technique, its feature exists
In：The a diameter of 2mm of camera of the video camera.
5. using Claims 1-4 4, any one system carries out the method that material microwave parameter is accurately tested, it is characterised in that：
Each microcam is demarcated first, the spin matrix between each subcoordinate system and self-defined global coordinate system is solved
And motion vector, sample image data is obtained by multiple cameras, the rotation between each coordinate system and global coordinate system is utilized
Torque battle array and motion vector, calculate the true location coordinate and shape of sample three-dimensional coordinate and specimen material in test fixture
Shape variable quantity, and function coefficients in testing algorithm or solve domain and be modified, further improve measuring accuracy.
6. according to claim 5 carry out the method that material microwave parameter is accurately tested, it is characterised in that including following step
Suddenly：
1) connecting test system：Microwave transmission line (6a) is connected to the port1 (1a) and test fixture of Network Analyzer (1)
(3) port2 (1b) and test clip of Network Analyzer (1) are connected between first port (3a), by microwave transmission line (6b)
Between the second port (3b) for having (3), connection Network Analyzer and computer, data line (7) are connected to miniature take the photograph
As on head (4a-4d)；
2) computer (2) and Network Analyzer (1) are opened, testing sample (9) size is measured, and record；
3) test software is opened, calibration data during sample is not placed in test；
4) in the case where not placing sample, microcam (4a-4d) is demarcated；
5) testing sample (9) is placed in test fixture (3), and by Network Analyzer and test software, obtains and place sample
Test data after product；
6) sample image data is obtained by microcam (4a-4d), and the three of sample is calculated using image processing software
Dimension coordinate and change in shape amount；
7) image processing data is imported into test software, and input sample size, with reference to the calibration data and placement tested before
Test data after sample, calculates microwave parameters of the specimen material under different frequency point.
7. according to claim 6 carry out the method that material microwave parameter is accurately tested, it is characterised in that：If test result
It is inaccurate, then repeat step (3)-(7).
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Application publication date: 20170822 |