Regression-based technique for improved optical rangefinding using tunable focus lenses

Area of Science:

• Optics and Photonics
• Optical Sensing Technologies

Background:

• Accurate target range estimation is crucial for various applications.
• Existing spatial signal processing methods can be complex and slow.

Purpose of the Study:

• To present a novel, compact, and fast method for target range estimation.
• To improve measurement dynamic range and resolution in optical sensing.

Main Methods:

• Utilizing a tunable focus lens (TFL) to adjust Gaussian beam spot size.
• Recording reflected beam diameter at an imaging detector for distance calculation.
• Employing multiple data points for robust range estimation.

Main Results:

• Demonstrated excellent agreement between experimental results and theoretical predictions.
• Achieved significant improvements in sensor's measurement dynamic range and resolution.
• Showcased extended dynamic range by incorporating a bias lens.

Conclusions:

• The proposed method offers a compact, fast, and robust solution for target range estimation.
• The electronically controlled sensor module allows for automation and integration.
• This technique presents a significant advancement over existing sensing schemes.