What is 3D scanning technology and 3D measurement technology
2019-06-01
How to obtain the three-dimensional information of the object, that is, the three-dimensional object surface profile measurement is developed. With the rapid development of computer technology and optoelectronic technology, new optical 3D scanning technologies and measurement methods are also emerging. Commonly used three-dimensional scanning technology is divided into contact type and non-contact type according to different sensing methods. The contact type directly contacts the surface of the object, and the photoelectric signal fed back by the probe is converted into digital surface information, thereby realizing scanning and measuring the surface shape of the object, including the coordinate measuring method and the electromagnetic digital method. Three-coordinate measurement is one of the most common measurement methods available today. Contact measurement has high accuracy and reliability; with the measurement software, the basic geometry of the object, such as surface, circle, cylinder, cone, sphere, etc., can be measured quickly and accurately. The disadvantage is that the measurement cost is high; the probe is prone to wear. The measurement speed is slow; detecting some internal components has inherent limitations, so the true shape of the object needs to compensate the probe radius, which may cause correction error; when the probe is in contact, the force of the probe will make the probe tip Partial deformation between the part and the device under test affects the actual reading of the measured value; due to the inertia and time delay of the trigger mechanism of the probe, the probe produces a transcendental phenomenon, and the approaching speed generates a dynamic error. With the rise and development of the emerging discipline of computer machine vision, the rapid measurement of the three-dimensional shape of curved surfaces by non-contact photoelectric methods has become a major trend. This non-contact measurement not only avoids the trouble of compensating the radius of the probe in the contact measurement, but also enables high-speed three-dimensional scanning of various surfaces.
there are many non-contact three-dimensional measurement methods, such as laser scanning measurement, structured light scanning measurement and industrial CT. Generally, it can be divided into the following two categories, one is 2D analysis, including occlusion shading method, Moiré fringe method, focusing method, photometry, etc.; the other is 3D model method, including time-of-flight distance detection method, Passive trigonometry and active trigonometry. The following describes several commonly used three-dimensional scanning technology based on triangulation: point laser measurement technology: The laser emits a single point to the surface of the object, and the sensor is observed on the other side, and the three-dimensional information of the object is reflected by each measurement point. It is characterized by high precision, but the measurement speed is slow, and it is faster to detect than the three-coordinate system. Line laser scanning technology: a laser emits a light (called a light knife) to the surface of the object, and the sensor is used to observe the deformed light knife on the other side, and the three-dimensional information of the object is restored by demodulating the optical knife. Compared with the point laser scanning technology, the scanning speed is greatly improved, but the motion system is also added to obtain a complete three-dimensional object surface representation. The measurement method also has high-precision features, and the representative system has a three-dimensional laser scanner, a handheld laser three-dimensional scanner, and the like. Surface scanning technology: This type of technology is matured mainly by structured light scanning. The transmitting system emits surface light (surface laser or stripe), the sensor is used to observe the deformed stripe on the other side, and the phase technique and computer vision technology are used to demodulate the deformed stripe. And restore the three-dimensional information of the object. This kind of technology has been greatly developed recently, and it can quickly acquire the surface information of the surface of the object. At the same time, it has high measurement accuracy and low measurement environment. It has great advantages for 3D scanning. scanner.Shenzhen Hualang Technology Co., Ltd. is a professional 3D digital high-tech dedicated to the development, sales and service integration of non-contact 3D scanning and inspection systems.The company has a series of laser and white light 3D scanning systems in different series of points, lines and surfaces, providing you with a range of solutions from 3D scanning, industrial inspection to industrial design, foot shoe customization and reverse engineering.
