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

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Published on: September 30, 2019

Displacement measurement using a laser feedback grating interferometer.

Dongmei Guo, Ming Wang, Hui Hao

|November 13, 2015

Summary

This summary is machine-generated.

A new laser feedback grating interferometer (LFGI) uses phase-generated carrier demodulation for high-resolution displacement sensing. This reliable system achieves nanometer-level resolution with a simple design.

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Area of Science:

Optics and Photonics
Metrology and Measurement Science

Background:

Laser feedback interferometry is crucial for precise measurements.
Existing methods may face limitations in resolution and complexity.

Purpose of the Study:

To propose a novel laser feedback grating interferometer (LFGI).
To enhance displacement measurement resolution using phase-generated carrier demodulation.

Main Methods:

Utilized a laser feedback grating interference setup.
Introduced phase modulation via an electro-optic modulator.
Employed time-domain orthogonal demodulation for displacement detection.

Main Results:

Demonstrated a nanometer-level resolution for displacement measurement.
The demodulation technique is insensitive to sampling errors.
The system exhibits high resolution, a simple mechanical structure, and good reliability.

Conclusions:

The proposed LFGI with phase-generated carrier demodulation offers superior displacement sensing.
This technology presents a promising solution for high-resolution, reliable displacement sensors.