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This study introduces a novel diffractive optical element (DOE) projector for adaptable 3D sensing. By adjusting laser source distance, it achieves tunable spot density without component changes, enhancing practical applications.

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Area of Science:

Computer Vision
Optical Engineering
Metasurface Technology

Background:

Structured light projection is crucial for high-precision 3D sensing.
Diffractive optical elements (DOEs) offer compact, low-power alternatives to DLP/LCD projectors.
Existing DOE methods generate fixed patterns, limiting adaptability in 3D measurement systems.

Purpose of the Study:

To propose a single DOE-based projector capable of tunable spot array density.
To overcome the limitations of fixed pattern generation in diffractive structured light projection.
To enable adaptable 3D sensing with adjustable resolution and frame rates.

Main Methods:

A single diffractive optical element (DOE) is employed as the core projection component.
Tunable spot array density is achieved by adjusting the distance between the laser source and the DOE.
No replacement of fixed optical components is required during the 3D measurement process.

Main Results:

Demonstrated a tunable-density sharp spot array structured light projection system.
Validated the proposed method through both simulation and experimental results.
Confirmed the effectiveness of adjusting laser-DOE distance for density control.

Conclusions:

The proposed single DOE projector offers a flexible and adaptable solution for 3D sensing.
Adjusting the laser source-DOE distance provides a simple yet effective mechanism for tuning spot density.
This method enhances the practicality of diffractive-based structured light projection for various applications.