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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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Large-scale range diffraction grating displacement sensor based on polarization phase-shifting.

Mengwei Li, Zhouxin Liang, Rui Zhang

|April 1, 2020

Summary

This summary is machine-generated.

This study introduces a novel diffraction grating displacement sensor method. It achieves nanometer resolution and an extended operational range using polarization phase-shifting and digital signal conversion.

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Area of Science:

Optics and Photonics
Metrology
Sensor Technology

Background:

Diffraction grating displacement sensors are crucial for precise measurements.
Existing sensors often face limitations in achieving both high resolution and extended range simultaneously.
The need for advanced displacement sensing in large-scale applications is growing.

Purpose of the Study:

To propose and demonstrate an improved diffraction grating displacement sensor.
To achieve simultaneous nanometer-level resolution and an extended operational range.
To provide guidance for designing high-performance micro-displacement sensors.

Main Methods:

Exploiting a polarization phase-shifting optical path to extract quadrature sinusoidal signals.
Utilizing an interpolation circuit for nonlinear conversion of sinusoidal signals into a standard incremental AB quadrature digital signal.
Leveraging laser coherence length to extend the sensor's operational range.

Main Results:

Successfully demonstrated a method to enhance diffraction grating displacement sensor performance.
Achieved simultaneous nanometer-level resolution and an extended measurement range.
Enabled displacement measurement over large-scale ranges.

Conclusions:

The proposed method effectively overcomes limitations of traditional displacement sensors.
This advancement is significant for large-scale displacement measurement applications.
Offers a valuable design guide for future high-performance micro-displacement sensors.