Multi-Point Laser Detection Device for Ground Hazards in Blind Mobility.

Area of Science:

• Assistive Technology
• Biomedical Engineering
• Robotics

Background:

• White canes fail to detect hazardous ground irregularities.
• Visually impaired individuals require enhanced environmental awareness for safe mobility.

Purpose of the Study:

• To develop and evaluate a multi-beam laser ranging system integrated into a white cane.
• To provide comprehensive ground awareness and anticipation for visually impaired users at a walking speed of 1 m/s.

Main Methods:

• A near-infrared multi-beam laser sensor with a holographic grating was used.
• A high-resolution CMOS sensor and optical triangulation enabled real-time hazard detection.
• Vibrotactile feedback with distinct patterns alerted users to elevation changes and drop-offs.

Main Results:

• The system successfully detected hazardous ground irregularities.
• Preliminary trials confirmed the system's feasibility, responsiveness, and energy efficiency.
• Participants found the system compatible with conventional white cane use.

Conclusions:

• The developed laser ranging system offers a promising solution for enhancing the mobility and safety of visually impaired individuals.
• This technology can significantly improve ground awareness beyond the capabilities of traditional white canes.
• Further development could lead to widespread adoption of advanced assistive mobility devices.