What Is a Beam Scan?

Three-dimensional scanning refers to the high-tech integrating light, machinery, electricity and computer technology. It is mainly used to scan the space shape, structure and color of objects to obtain the space coordinates of the object surface.

3D scanning

Three-dimensional scanning refers to the high-tech integrating light, machinery, electricity and computer technology. It is mainly used to scan the space shape, structure and color of objects to obtain the space coordinates of the object surface.

Its important significance is that it can convert the three-dimensional information of the physical object into a digital signal that can be directly processed by the computer, which provides a very convenient and fast means for digitizing the physical object. 3D scanning technology can achieve

3D scanning technology is mainly used in the following areas:

1.

Photo style

Scanning range is up to: 400 × 300mm area can be scanned on one side, and the depth of field is generally 300-500mm.

Highest accuracy: 0.007mm

Advantages: large scanning range, fast speed, high precision, and less point cloud scanning. The system's built-in landmarks automatically splice and automatically delete duplicate data, which is simple and cheap.

Articulated arm

Scan range up to: 4 meters.

The highest precision: 0.016mm.

Advantages: high accuracy, theoretically, the measurement range can be infinite.

Three coordinates (fixed)

Scanning range: for the work surface of the specified model.

Scanning accuracy up to: 0.9um

Advantages: High accuracy, suitable for measuring large-size objects, such as the entire vehicle frame.

Disadvantages: Scanning is slow and takes a long time

Laser tracking

Scan range up to: 70 meters.

Scanning accuracy up to: 0.003mm

Advantages and disadvantages: high accuracy, large measurement range, can measure large objects such as buildings, the price is higher.

Laser scanning

Scanning range: relatively low.

Advantages: fast scanning speed, portable, convenient, suitable for objects that do not require high accuracy.

Disadvantage: low scanning accuracy.

Structured light scanner principle

The optical 3D scanning system continuously projects the grating onto the surface of the object, the camera synchronously collects the images, then calculates the images, and uses the phase-stable polar line to achieve the three-dimensional spatial coordinates (X, Y, Z) on the two images, thereby achieving Measurement of three-dimensional contours of object surfaces.

Laser scanner principle

Since the scanning method is based on time, it is also called the time method. It is a very accurate, fast, and easy-to-operate instrument, and can be installed on the production line to form an instrument that is inspected during production. The basic structure of a laser scanner includes a laser light source and scanner, a light receiving (detection) detector, and a control unit. The laser light source is sealed, less susceptible to the environment, and easy to form a beam. At present, low-power visible light lasers, such as helium-neon lasers, semiconductor lasers, etc. are often used. After the light beam enters the scanner, it is quickly rotated to reflect the laser light into a scanning beam. During the whole scanning process of the beam, if there is a workpiece blocking the light, the diameter can be measured. Before measurement, two gauges with known dimensions must be used for calibration. If all the measured dimensions are between these two gauges, the measured dimensions can be obtained after electronic signal processing. Therefore, it is also called laser gauge.

Three-coordinate principle

The coordinate measuring machine is a rectangular coordinate system established by three mutually perpendicular movement axes X, Y, Z. All movements of the probe are performed in this coordinate system. The movement track of the probe is represented by the center of the ball. . When measuring, place the tested part on the workbench, the probe is in contact with the surface of the part, the detection system of the CMM can give the precise position of the center point of the ball in the coordinate system at any time. When the measuring ball moves along the geometrical surface of the workpiece, the geometrical dimensions, current status and position tolerance of the measured workpiece can be accurately calculated. ^[1]