CN106840251B - Three-dimensional scanning system for appearance detection of low-voltage current transformer - Google Patents
Three-dimensional scanning system for appearance detection of low-voltage current transformer Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- 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
Abstract
The invention provides a three-dimensional scanning system for appearance detection of a low-voltage current transformer, which comprises: the low-voltage current transformer installation module: the device is used for installing the low-voltage current transformer to be tested and controlling the translation and rotation of the low-voltage current transformer to be tested; a grating emission module: the grating is used for projecting the grating to the low-voltage current transformer to be tested; an image acquisition module: the system is used for acquiring the image of the low-voltage current transformer to be detected after the grating processing and sending the acquired image information to the data processing module; a data processing module: and analyzing the image information sent by the image acquisition module, and comparing and calculating the analyzed image information with the three-dimensional image information of the standard low-voltage current transformer to obtain the detection error of the low-voltage current transformer to be detected. The technical scheme provided by the invention can realize full-automatic accurate measurement of the appearance size and the error of the low-voltage current transformer to be measured, and the measurement result is more accurate and reliable and has higher speed.
Description
Technical Field
The invention relates to a three-dimensional scanning system, in particular to a three-dimensional scanning system for appearance detection of a low-voltage current transformer.
Background
With the wide application of the mutual inductor in the power system, the appearance size of the mutual inductor is measured by using a three-dimensional measurement technology, and the measurement method becomes an indispensable means for realizing intellectualization, automation and precision of measurement and detection in a laboratory. The development of modern industry, especially the rapid development of advanced manufacturing techniques centered on digital manufacturing, places higher demands on precision measurement techniques. The precision measurement technique should not only provide the important role of technical quality assurance for the advanced manufacturing technique, but also contribute to the improvement of the product production efficiency.
The three-dimensional scanning systems related to the prior art cannot realize high-precision measurement of a reflecting material, free switching of blue and white light, automation of an integrated assembly line device, no special measuring device for performing programmed three-dimensional scanning on a mutual inductor, and certain defects in appearance and size errors of the detected mutual inductor. Therefore, the design of the three-dimensional scanning system for the appearance detection of the low-voltage current transformer has important significance for improving the measurement accuracy, the detection speed and the like of the appearance detection of the low-voltage current transformer.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a three-dimensional scanning system for appearance detection of a low-voltage current transformer, which is applied to appearance inspection and size scanning of transformers and can meet the requirements of the national standard Q/GDW 572-2010 "technical specification of low-voltage current transformers for metering": the problems of low measurement efficiency, poor measurement reliability, large measurement uncertainty and the like caused by the influence of environmental conditions and human errors when the external dimension of the low-voltage current transformer is measured by manual operation can be effectively solved.
The technical scheme provided by the invention is as follows: in a three-dimensional scanning system for appearance inspection of low voltage current transformers, the improvement comprising: the system comprises:
the low-voltage current transformer installation module: the device is used for installing the low-voltage current transformer to be tested and controlling the translation and rotation of the low-voltage current transformer to be tested;
a grating emission module: the grating is used for projecting the grating to the low-voltage current transformer to be tested;
an image acquisition module: the system is used for acquiring the image of the low-voltage current transformer to be detected after the grating processing and sending the acquired image information to the data processing module;
a data processing module: and analyzing the image information sent by the image acquisition module, and comparing and calculating the analyzed image information with the three-dimensional image information of the standard low-voltage current transformer to obtain the detection error of the low-voltage current transformer to be detected.
Preferably, the low-voltage current transformer installation module includes:
a motion control box: the electric control translation table and the electric control rotating table are respectively connected through signal wires and control the translation of the electric control translation table and the rotation of the electric control rotating table;
an electric control translation stage: the linear guide rail is arranged on the linear guide rail and does linear motion on the linear guide rail under the control of the motion control box;
an electric control rotating platform: the electric control translation platform is arranged on the electric control translation platform, linearly moves along with the electric control translation platform, and simultaneously performs three-dimensional rotary motion under the control of the motion control box;
shock insulation platform: and the electric control rotating platform is fixed on the electric control rotating platform, moves along with the electric control rotating platform, is used for installing the low-voltage current transformer to be tested, and shields the surrounding environment and the vibration of the low-voltage current transformer to be tested.
Preferably, the grating emission module firstly projects a group of grating images with light intensity distributed in a positive rotation manner to the low-voltage current transformer to be tested; and then projecting three color images of red, green and blue to the low-voltage current transformer to be tested.
Further, the grating emission module is composed of a DLP projector; the DLP projector and the image acquisition module are arranged in the same box; the machine box is arranged in front of the low-voltage current transformer to be tested and is connected with the data processing module; and the DLP projector can project grating images and color images to the low-voltage current transformer to be detected under the control of the data processing module.
Further, when the grating emission module projects a grating image to the low-voltage current transformer to be detected, the image acquisition module synchronously acquires a grating image which is modulated and deformed by the low-voltage current transformer to be detected on a reference plane, obtains three-dimensional coordinate data of the surface of the low-voltage current transformer to be detected through phase calculation and three-dimensional reconstruction by using the grating image, and transmits the three-dimensional coordinate data to the data processing module;
when the grating emission module projects three color images of red, green and blue to the low-voltage current transformer to be detected, the image acquisition module synchronously acquires image information of the low-voltage current transformer to be detected on a reference plane under the irradiation of the three color images of red, green and blue, synthesizes color texture data of the low-voltage current transformer to be detected according to the image information, and transmits the color texture data to the data processing module.
Preferably, the image acquisition module consists of a binocular camera, and the binocular camera comprises two cameras which are respectively arranged at two sides of the grating emission module; the two cameras adopt a hardware synchronization mechanism to shoot the low-voltage current transformer to be tested from different angles so as to obtain two pieces of digital image information of the low-voltage current transformer to be tested, the two pieces of digital image information are uploaded to a data processing module through a signal wire, and each piece of digital image information comprises three-dimensional coordinate data and color texture data.
Further, changeable light filter is installed additional in camera the place ahead to realize freely switching of blue and white light source according to the different material characteristics of the low voltage current transformer that awaits measuring: when a low-voltage current transformer to be measured with a material with strong light reflectivity is measured, blue light measurement is used, and only blue light with specific wavelength passes through the filter so as to reduce the interference of ambient light; when measuring the low-voltage current transformer to be measured with other material characteristics, the optical filter is cut off, and white light measurement is used.
Preferably, the data processing module comprises a data analysis module and an error calculation module; the data analysis module receives the digital image information uploaded by the image processing module and analyzes the digital image information to obtain the appearance size of the low-voltage current transformer to be tested; and the error calculation module calculates the error of the appearance size of the low-voltage current transformer to be detected according to the appearance size of the low-voltage current transformer to be detected and the appearance size of the standard low-voltage current transformer stored in the error calculation module.
Further, the data processing module is composed of a computer; and the computer is respectively connected with the DLP projector and the binocular camera through the USB interface and the signal line and is used for controlling the image projection of the DLP projector and processing the digital image information shot by the binocular camera so as to obtain the appearance size data and the error of the low-voltage current transformer to be detected.
Further, the reference plane and the DLP projector are respectively positioned at two sides of the low-voltage current transformer to be tested; a connecting line of optical focuses of the binocular camera and the DLP projector is parallel to the reference plane; the binocular camera is focused on the reference plane; the shooting area of the binocular camera is equal to the projection area of the DLP projector.
Compared with the closest prior art, the invention has the following remarkable progress:
1. according to the three-dimensional scanning system for the appearance detection of the low-voltage current transformer, the DLP projector transmits the grating to the low-voltage current transformer to be detected, the binocular camera acquires the digital image information of the low-voltage current transformer to be detected, and the computer analyzes the digital image information of the low-voltage current transformer to be detected, so that the full-automatic accurate measurement of the appearance size and the error of the low-voltage current transformer to be detected can be realized, the measured parameter data are more accurate and reliable, the measurement speed is higher, and the problems of poor reliability and large measurement uncertainty caused by environmental conditions and artificial errors when the appearance size of the low-voltage current transformer is manually measured are effectively solved;
2. the three-dimensional scanning system adopts the low-voltage current transformer installation module to install the low-voltage current transformer to be measured, so that the low-voltage current transformer to be measured can be randomly turned and moved in the scanning process, the low-voltage current transformer to be measured can be measured based on a plurality of visual angles, the low-voltage current transformer to be measured can be automatically spliced through system software of a computer, and the high-precision measurement of the low-voltage current transformer at 360 degrees can be realized.
3. According to the three-dimensional scanning system, the low-voltage current transformer is arranged on the movable electric control translation table, the operation of an integrated assembly line can be directly realized, the operation is simple, the practicability is high, the disassembly is convenient, the requirement on a measuring environment is low, the system design is small and exquisite, the system is easy to carry, and the three-dimensional scanning system has practical significance for the appearance inspection engineering application of the low-voltage current transformer.
4. The switchable optical filter is additionally arranged in front of the camera, different light sources can be selected for measurement according to different materials of the low-voltage current transformer to be measured, the interference of ambient light can be inhibited, and the reliability of data acquisition is improved.
Drawings
Fig. 1 is a block diagram of a hardware structure of a three-dimensional scanning system provided by the present invention.
Fig. 2 is a position relationship diagram of the grating emission module, the image acquisition module, the low-voltage current transformer to be measured and the reference plane.
Wherein 1-a projection grating; 2-a camera of a binocular camera; 3-a low-voltage current transformer to be tested; 4-reference plane.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
The invention provides a three-dimensional scanning system for appearance detection of a low-voltage current transformer, and the overall structural block diagram of the three-dimensional scanning system is shown in figure 1. The system comprises:
the low-voltage current transformer installation module: the device is used for installing the low-voltage current transformer to be tested and controlling the translation and rotation of the low-voltage current transformer to be tested;
a grating emission module: the grating is used for projecting the grating to the low-voltage current transformer to be tested; the projected grating is interfered with the surface of the low-voltage current transformer to be measured and then projected on a reference plane, so that the low-voltage current transformer is convenient to collect by an image collecting module;
an image acquisition module: the system is used for acquiring the image of the low-voltage current transformer to be detected after the grating processing and sending the acquired image information to the data processing module;
a data processing module: and analyzing the image information sent by the image acquisition module, and comparing and calculating the analyzed image information with the three-dimensional image information of the standard low-voltage current transformer to obtain the detection error of the low-voltage current transformer to be detected.
The low-voltage current transformer installation module includes:
a motion control box: the electric control translation table and the electric control rotating table are respectively connected through signal wires and control the translation of the electric control translation table and the rotation of the electric control rotating table;
an electric control translation stage: the linear guide rail is arranged on the linear guide rail and does linear motion on the linear guide rail under the control of the motion control box;
an electric control rotating platform: the electric control translation platform is arranged on the electric control translation platform, linearly moves along with the electric control translation platform, and simultaneously performs three-dimensional rotary motion under the control of the motion control box;
shock insulation platform: and the electric control rotating platform is fixed on the electric control rotating platform, moves along with the electric control rotating platform, is used for installing the low-voltage current transformer to be tested, and shields the surrounding environment and the vibration of the low-voltage current transformer to be tested.
The main control device of the motion control box is a PLC (programmable logic controller), the PLC controls the translation and rotation of the low-voltage current transformer to be detected, the data processing module controls the image acquisition module to acquire images of the low-voltage current transformer to be detected based on a plurality of visual angles, and the system software of the data processing module is used for automatically splicing, so that 360-degree high-precision measurement of the low-voltage current transformer to be detected is realized.
The integrated assembly line type appearance detection of the low-voltage current transformer to be detected can be realized by adopting the electric control translation table, and after the scanning of a single low-voltage current transformer to be detected is finished, data analysis is carried out by the data processing module; and then, the next low-voltage current transformer to be detected is continuously scanned, and new digital image data is reloaded into the data processing module, so that the automation of appearance detection of the low-voltage current transformer to be detected is realized, and the detection efficiency and the detection precision are greatly improved.
The grating emission module firstly projects a group of grating images with the light intensity distributed in a positive rotation manner to the low-voltage current transformer to be detected; and then projecting three color images of red, green and blue to the low-voltage current transformer to be tested.
The grating emission module consists of a DLP projector; the DLP projector and the image acquisition module are arranged in the same box; the machine box is arranged in front of the low-voltage current transformer to be tested and is connected with the data processing module; and the DLP projector can project grating images and color images to the low-voltage current transformer to be detected under the control of the data processing module.
When the grating emission module projects a grating image to the low-voltage current transformer to be detected, the image acquisition module synchronously acquires a grating image which is modulated and deformed by the low-voltage current transformer to be detected on a reference plane, acquires three-dimensional coordinate data of the surface of the low-voltage current transformer to be detected by utilizing the grating image through phase calculation and three-dimensional reconstruction, and transmits the three-dimensional coordinate data to the data processing module;
when the grating emission module projects three color images of red, green and blue to the low-voltage current transformer to be detected, the image acquisition module synchronously acquires image information of the low-voltage current transformer to be detected on a reference plane under the irradiation of the three color images of red, green and blue, synthesizes color texture data of the low-voltage current transformer to be detected according to the image information, and transmits the color texture data to the data processing module.
Because the three-dimensional coordinate data and the color texture data come from the same image acquisition module, the data processing module can establish the corresponding relation between the three-dimensional coordinate data and the color texture data, and can restore the 3D appearance of the low-voltage current transformer to be tested by combining digital image information shot at different angles.
The image acquisition module consists of a binocular camera, and the binocular camera comprises two cameras which are respectively arranged at two sides of the grating emission module; the two cameras adopt a hardware synchronization mechanism to shoot the low-voltage current transformer to be tested from different angles so as to obtain two pieces of digital image information of the low-voltage current transformer to be tested, and the two pieces of digital image information are uploaded to a data processing module through a signal wire; each piece of digital image information includes three-dimensional coordinate data and color texture data.
The switchable light filter is additionally arranged in front of the camera to realize free switching of the blue-white light source according to different material characteristics of the low-voltage current transformer to be tested: when a low-voltage current transformer to be measured with a material with strong light reflectivity is measured, blue light measurement is used, and only blue light with specific wavelength passes through the filter so as to reduce the interference of ambient light; when measuring the low-voltage current transformer to be measured with other material characteristics, the optical filter is cut off, and white light measurement is used.
The switchable optical filter is additionally arranged in front of the camera, so that different light sources can be selected for measurement according to different material characteristics of the low-voltage current transformer to be measured, the interference of ambient light is suppressed, and the reliability of data acquisition is improved.
The data processing module comprises a data analysis module and an error calculation module; the data analysis module receives the digital image information uploaded by the image processing module and analyzes the digital image information to obtain the appearance size of the low-voltage current transformer to be tested; and the error calculation module calculates the error of the appearance size of the low-voltage current transformer to be detected according to the appearance size of the low-voltage current transformer to be detected and the appearance size of the standard low-voltage current transformer stored in the error calculation module.
The data processing module consists of a computer; and the computer is respectively connected with the DLP projector and the binocular camera through the USB interface and the signal line and is used for controlling the image projection of the DLP projector and processing the digital image information shot by the binocular camera so as to obtain the appearance size data and the error of the low-voltage current transformer to be detected.
As shown in fig. 2: the reference plane and the DLP projector are respectively positioned on two sides of the low-voltage current transformer to be tested; a connecting line of optical focuses of the binocular camera and the DLP projector is parallel to the reference plane; the binocular camera is focused on the reference plane; the shooting area of the binocular camera is equal to the projection area of the DLP projector, so that the projection grating can be fully utilized.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is set forth in the claims appended hereto.
Claims (5)
1. A three-dimensional scanning system for appearance detection of a low-voltage current transformer is characterized in that,
the system comprises:
the low-voltage current transformer installation module: the device is used for installing the low-voltage current transformer to be tested and controlling the translation and rotation of the low-voltage current transformer to be tested;
a grating emission module: the grating is used for projecting the grating to the low-voltage current transformer to be tested;
an image acquisition module: the system is used for acquiring the image of the low-voltage current transformer to be detected after the grating processing and sending the acquired image information to the data processing module;
a data processing module: analyzing the image information sent by the image acquisition module, and comparing and calculating the analyzed image information with the three-dimensional image information of the standard low-voltage current transformer to obtain the detection error of the low-voltage current transformer to be detected;
the image acquisition module consists of a binocular camera, and the binocular camera comprises two cameras which are respectively arranged at two sides of the grating emission module; the two cameras adopt a hardware synchronization mechanism to shoot the low-voltage current transformer to be tested from different angles so as to obtain two pieces of digital image information of the low-voltage current transformer to be tested, and the two pieces of digital image information are uploaded to a data processing module through a signal wire, wherein each piece of digital image information comprises three-dimensional coordinate data and color texture data;
the switchable light filter is additionally arranged in front of the camera to realize free switching of the blue-white light source according to different material characteristics of the low-voltage current transformer to be tested: when a low-voltage current transformer to be measured with a material with strong light reflectivity is measured, blue light measurement is used, and only blue light with specific wavelength passes through the filter so as to reduce the interference of ambient light; when measuring a low-voltage current transformer to be measured with other material characteristics, cutting off the optical filter, and measuring by using white light;
the grating emission module firstly projects a group of grating images with the light intensity distributed in a positive rotation manner to the low-voltage current transformer to be detected; then projecting three color images of red, green and blue to the low-voltage current transformer to be tested;
when the grating emission module projects a grating image to the low-voltage current transformer to be detected, the image acquisition module synchronously acquires a grating image which is modulated and deformed by the low-voltage current transformer to be detected on a reference plane, acquires three-dimensional coordinate data of the surface of the low-voltage current transformer to be detected by utilizing the grating image through phase calculation and three-dimensional reconstruction, and transmits the three-dimensional coordinate data to the data processing module;
when the grating emission module projects three color images of red, green and blue to the low-voltage current transformer to be detected, the image acquisition module synchronously acquires image information of the low-voltage current transformer to be detected on a reference plane under the irradiation of the three color images of red, green and blue, synthesizes color texture data of the low-voltage current transformer to be detected according to the image information, and transmits the color texture data to the data processing module;
the reference plane and the DLP projector are respectively positioned on two sides of the low-voltage current transformer to be tested; a connecting line of optical focuses of the binocular camera and the DLP projector is parallel to the reference plane; the binocular camera is focused on the reference plane; the shooting area of the binocular camera is equal to the projection area of the DLP projector.
2. The three-dimensional scanning system of claim 1,
the low-voltage current transformer installation module includes:
a motion control box: the electric control translation table and the electric control rotating table are respectively connected through signal wires and control the translation of the electric control translation table and the rotation of the electric control rotating table;
an electric control translation stage: the linear guide rail is arranged on the linear guide rail and does linear motion on the linear guide rail under the control of the motion control box;
an electric control rotating platform: the electric control translation platform is arranged on the electric control translation platform, linearly moves along with the electric control translation platform, and simultaneously performs three-dimensional rotary motion under the control of the motion control box;
shock insulation platform: and the electric control rotating platform is fixed on the electric control rotating platform, moves along with the electric control rotating platform, is used for installing the low-voltage current transformer to be tested, and shields the surrounding environment and the vibration of the low-voltage current transformer to be tested.
3. The three-dimensional scanning system of claim 1,
the grating emission module consists of a DLP projector; the DLP projector and the image acquisition module are arranged in the same box; the machine box is arranged in front of the low-voltage current transformer to be tested and is connected with the data processing module; and the DLP projector can project grating images and color images to the low-voltage current transformer to be detected under the control of the data processing module.
4. The three-dimensional scanning system of claim 1,
the data processing module comprises a data analysis module and an error calculation module; the data analysis module receives the digital image information uploaded by the image processing module and analyzes the digital image information to obtain the appearance size of the low-voltage current transformer to be tested; and the error calculation module calculates the error of the appearance size of the low-voltage current transformer to be detected according to the appearance size of the low-voltage current transformer to be detected and the appearance size of the standard low-voltage current transformer stored in the error calculation module.
5. The three-dimensional scanning system of claim 4,
the data processing module consists of a computer; and the computer is respectively connected with the DLP projector and the binocular camera through the USB interface and the signal line and is used for controlling the image projection of the DLP projector and processing the digital image information shot by the binocular camera so as to obtain the appearance size data and the error of the low-voltage current transformer to be detected.
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| CN101813461A (en) * | 2010-04-07 | 2010-08-25 | 河北工业大学 | Absolute phase measurement method based on composite color fringe projection |
| CN101825445A (en) * | 2010-05-10 | 2010-09-08 | 华中科技大学 | Three-dimension measuring system for dynamic object |
| CN103438834A (en) * | 2013-09-17 | 2013-12-11 | 清华大学深圳研究生院 | Hierarchy-type rapid three-dimensional measuring device and method based on structured light projection |
| CN104390608A (en) * | 2014-11-27 | 2015-03-04 | 上海江南长兴造船有限责任公司 | Projection grating phase method based structured light three-dimensional shape construction method |
| CN104483647A (en) * | 2014-12-11 | 2015-04-01 | 广东电网有限责任公司电力科学研究院 | Device and method for automatically recognizing appearance information of low-voltage current transformer in production line |
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