Tracking objects outside the line of sight using laser Doppler coherent detection.

Area of Science:

• Optics and Photonics
• Non-Line-of-Sight Imaging
• Laser Doppler Velocimetry

Background:

• Non-line-of-sight (NLOS) imaging presents significant challenges in retrieving information from obscured objects.
• Traditional methods often require complex algorithms or high costs, limiting practical applications.

Purpose of the Study:

• To propose and validate a novel laser Doppler Non-Line-of-Sight (LD-NLOS) imaging technique.
• To demonstrate the capability of retrieving object information from scattered light signals.
• To enable target vibration velocity detection and 2D shape reconstruction.

Main Methods:

• Utilizing the laser Doppler coherent detection method.
• Analyzing frequency and light intensity characteristics of scattered signals.
• Decoding information from the intermediate scattering surface.

Main Results:

• Successfully obtained effective information about objects outside the line of sight.
• Demonstrated the ability to decode information from hidden objects.
• Achieved stable 2D shape reconstruction of the target.

Conclusions:

• The proposed LD-NLOS technique offers a viable solution for non-line-of-sight detection.
• It bypasses the need for complex backend processing and expensive experimental setups.
• The technique reliably measures vibration velocity and reconstructs target shapes.