Ma HaoOPTICS & SOFTWARE
GitHub 2030985559@qq.comEmailChinese
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PROJECT / In progress

Closed-Loop Fringe Locking

Calibration and cyclic control validated

Connecting line-scan acquisition, phase demodulation, and piezoelectric compensation for holographic gratings.

July 21, 2026

Experimental feedback loop

Calibration and cyclic control completed in July 2026

Software integration

Qt/C++ camera acquisition and piezoelectric control in progress

A photograph of the fringe-locking experiment showing reference and current fringes, phase error, piezo position, and control commands
Experimental interface photographed on July 21, 2026: fringe comparison, phase error, PZT position, and control commands. This single run is not a complete assessment of locking accuracy or long-term stability. Click to view the original.

Results

Completed system calibration and cyclic-control validation in July 2026, connecting camera acquisition, phase demodulation, and piezoelectric compensation.

Problem & method

Environmental disturbances move interference fringes during holographic grating fabrication. The system captures a reference fringe, demodulates at a fixed carrier frequency, and uses calibration to convert phase error into piezoelectric compensation.

My contribution

  • Integrated a line-scan camera and tested acquisition and calibration.
  • Developed MATLAB control software and helped validate the feedback loop.
  • Advanced a Qt/C++ desktop application with camera and serial piezoelectric drivers.

Current status

The MATLAB experimental loop is validated. Qt/C++ migration and hardware testing continue; locking accuracy, response time, and long-term stability still require measurement.

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