Contents
Source: Leica Geosystems
Understanding Laser Scanners
A laser scanner is a versatile device used to control the direction of a laser beam. It finds applications in various fields such as laser material processing, LIDAR imaging, and laser displays.
Operation Principles
Laser scanners operate based on different principles:
- Rotating Mirror Scanners: Utilize a rotating mirror to direct the laser beam.
- Polygon Scanners: Use a rotating polygon with mirror segments for beam deflection.
- Galvanometer Scanners: Employ electromagnetic forces to rotate a mirror.
Types of Scanning
Scanners can use reflective elements like mirrors or refractive elements like lenses for beam deflection. They can be pre-objective (before focusing) or post-objective (after focusing) scanners.
Advanced Scanning Technologies
Some scanners, such as acousto-optic and electro-optic scanners, operate without moving parts. Optical phased arrays manipulate the combined beam direction through controlled phase differences between emitters.
Applications
Laser scanners are integral in various applications:
- Laser Printers: Use one-dimensional scanners for image drum illumination.
- Laser Microscopy and OCT: Enable sequential image acquisition for microscopy.
- Laser Material Processing: Facilitate laser marking, drilling, welding, and hardening.
- Barcode Readers: Utilize laser scanners for reading barcodes.
- 3D Object Scanning: Employ LIDAR devices with laser scanners for object scanning.
- Laser Displays and Shows: Power laser displays and shows with scanning technology.
Future Developments
Advancements like optical phased arrays and quasi-simultaneous processing are shaping the future of laser scanning technology, promising more efficient and precise applications in various industries.
Source: Artec 3D
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