A three-dimensional measuring device and method for large-scale surfaces
A three-dimensional measurement, large-scale technology, applied in the direction of measuring devices, optical devices, instruments, etc., can provide new ideas for the lack of multi-sensor data integration, the difficulty of online detection of the three-dimensional size of large parts, and the lack of multi-sensor data Integrate methods and other issues to achieve fast measurement speed, solve the level of automation and intelligence, and achieve the effect of flexible architecture
Active Publication Date: 2020-05-26
SHANGHAI JIAOTONG UNIV +1
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The patent "A Line-structured Light 3D Measurement System and 3D Texture Image Construction Algorithm" (CN104236479B) obtains the 3D contour of the object surface through continuous scanning, and constructs 3D texture images through point cloud data processing, but it does not integrate multi-sensor data. provide new ideas
[0005] It can be seen that there is currently no effective means for three-dimensional detection of large-scale surfaces, and it is impossible to break through the size limit of single-sensor detection. There is a lack of multi-sensor data integration methods, and it is difficult to avoid the adverse effects of moving intervals on scanning detection accuracy, resulting in three-dimensional dimensions of large parts. Difficult to perform online detection
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[0039]The invention proposes a detection device based on the cooperative work of multiple triangulation modules and a detection data integration method based on grid division. The specific steps are: use a camera and a cross laser to form a measurement module, fix multiple detection modules in parallel on an adjustable fixture, each detection module is calibrated independently, there is a small amount of overlapping areas between adjacent modules, and the overlapping areas are used to measure adjacent cameras. spacing. The moving frame drives the fixture to move along the length direction of the detection platform. During the moving process, the main control computer obtains the position of the moving frame and triggers the camera to take pictures synchronously; in the cross laser image obtained, the center of the horizontal laser line is extracted by the column-by-column scanning method. combined to determine the sub-pixel laser center on each scanning line; for the laser lin...
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The invention discloses a three-dimensional measuring device and method used for a large dimension surface, and relates to the field of dimension measuring. The device comprises a measuring module, anadjustable fixture, a moving framework, a servo motor, a main control computer and a detection platform, the measuring module is fixed with the adjustable fixture, the adjustable fixture is fixed onthe moving frame, the moving frame is driven by the servo motor to move in the length direction of the detection platform, all detection movements are controlled by the main control computer, and a to-be-detected workpiece is placed on the detection platform. The method is simple, effective, easy for an operator to handle and high in measuring precision, the adaptability and accuracy of a measuring system of a large dimension surface can be effectively achieved, and the device and the method have better application prospect in the field of non-contact type three-dimensional high precision measuring.
Description
technical field [0001] The invention relates to the field of size measurement, in particular to a three-dimensional measurement device and method for large-size surfaces. Background technique [0002] Triangulation technology has the characteristics of non-contact, high measurement accuracy, and fast dynamic response, and has a very wide range of applications in the field of high-precision three-dimensional measurement. The current measurement method is mainly aimed at small-sized surfaces, which is completed by a single camera and structured laser, and the detection area is small; when the scanning method is used for detection, the detection accuracy in the length direction is low due to the influence of the scanning interval. [0003] The search found that the current representative achievements in this field include: [0004] The paper "Study on the Surface Detection of Arc-like Workpieces by Laser Displacement Sensor" proposed a method for detecting arc-like workpieces ...
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IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 蔡艳蒋知峰吴毅雄周春立孔谅华学明金鑫毛建楠
Owner SHANGHAI JIAOTONG UNIV