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Modified homodyne laser interferometer based on phase modulation for simultaneously measuring displacement and angle.

Xianfan Wang, Jingjing Su, Jianhua Yang

|June 18, 2021

Summary

This study introduces a novel homodyne laser interferometer that accurately measures both displacement and angle simultaneously. Its phase modulation technique improves stability against environmental changes and laser power fluctuations.

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Published on: August 12, 2013

Area of Science:

Optics and Photonics
Metrology
Instrumentation

Background:

Laser interferometers are crucial for high-precision measurements in science and industry.
Existing designs face challenges with environmental fluctuations and laser power drift, limiting accuracy.
Simultaneous displacement and angle measurement is a key requirement for advanced applications.

Purpose of the Study:

To develop a modified homodyne laser interferometer for simultaneous displacement and angle measurement.
To enhance the interferometer's robustness against environmental disturbances and laser power variations.
To achieve direct, real-time derivation of displacement and angle values.

Main Methods:

A modified Michelson-type interferometer configuration utilizing polarized optic theory.
Implementation of active sawtooth wave phase modulation for enhanced signal processing.
Employing a sinusoidal measurement retro-reflector for precise optical feedback.
Utilizing zero-crossing detection technique for phase difference analysis.

Main Results:

The proposed interferometer successfully achieves simultaneous measurement of displacement and angle.
Active sawtooth wave phase modulation demonstrated significant immunity to environmental fluctuations and laser power drift.
Experimental validation confirmed good static and dynamic performance of the developed system.
Direct derivation of real-time displacement and angle values was achieved.

Conclusions:

The modified homodyne laser interferometer offers a robust and accurate solution for simultaneous displacement and angle metrology.
The phase modulation technique significantly improves the stability and reliability of laser interferometry.
This advancement holds potential for broader applications in scientific research and industrial inspection.