The 3D foot scanner achieves high-precision measurement of arch height through laser triangulation technology, with its core principles and implementation as follows:
I. Laser Triangulation Technology Principle
Non-contact laser projection
The device projects structured light or dot-matrix lasers onto the sole and captures reflected light via high-precision optical sensors (e.g., CMOS/CCD) to generate 3D point cloud data.
Multi-angle synchronous acquisition
An 8-16 directional optical system scans simultaneously, collecting over 20 parameters such as arch height and curvature within 10 seconds with 0.5mm accuracy.
Dynamic modeling and algorithmic analysis
Scan data is processed through complex algorithms to create a 3D foot model, with the Arch Index (AI) determining high arches (AI<0.21) or flat feet (AI>0.26).
II. Technical Advantages and Limitations
High precision and efficiency
Compared to manual methods (e.g., powder footprint tracing), laser scanning eliminates human error and supports digital production for 3D-printed insoles.
Dynamic foot type identification
Can detect arch collapse under load (e.g., overpronation), but traditional Arch Index may misjudge static scans.
Advanced algorithm integration
Pressure distribution data can be combined to address misdiagnosis.
III. Typical Applications
Custom orthotics: Scan data exports directly to STL files for 3D printing.
Sports rehabilitation: Identifies abnormal gaits (e.g., flat feet) and provides correction guidance.
This technology significantly enhances the accuracy and value of arch measurement through non-contact laser scanning and algorithmic analysis, particularly in children’s foot development monitoring and sports injury prevention.
