Design of a wide-field wavelength-coded depth-sensing objective.

Area of Science:

• Optics and Photonics
• Computer Vision
• Metrology

Background:

• Accurate 3D surface data acquisition is crucial for various applications.
• Existing depth-sensing techniques often face limitations in field of view (FOV) or focal range.
• Wavelength-encoded optics offer a promising avenue for advanced depth perception.

Purpose of the Study:

• To develop a wide-field, wavelength-encoded depth-sensing objective.
• To enable efficient 3D surface data acquisition over a millimeter-scale focal shift.
• To achieve high linearity and uniform imaging quality across a broad field of view.

Main Methods:

• Designed a dual-telecentric six-lens optical configuration.
• Optimized for large-range, linear axial chromatic aberration.
• Integrated with 2D mechanical scanning or point-source arrays for data acquisition.

Main Results:

• Achieved a 5.27 mm focal shift with R²=0.99 linearity within the 420-700 nm band.
• Demonstrated uniform imaging quality over a 16x16 mm² FOV.
• Attained a lateral resolution of 3.10 µm at the central wavelength.

Conclusions:

• The developed objective enables efficient and accurate 3D surface data acquisition.
• The wavelength-encoded approach provides robust depth perception.
• The system's design considers manufacturing tolerances for practical implementation.