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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

Novel absolute displacement sensor with wide range based on malus law.

Wei Li¹, Xiaoping Lu, Yonggang Lin

¹The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China; E-Mails: liw@zju.edu.cn (W.L.); lovexiaoping@gmail.com (X.L.).

Sensors (Basel, Switzerland)

|February 4, 2012

Summary

This study introduces a new wide-range absolute displacement sensor using polarized light. It overcomes light source intensity drift for accurate, broad-range measurements up to 540 mm.

Keywords:

absolute measurement displacement sensor light source drift polarized light wide range

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Area of Science:

Optics and Photonics
Mechanical Engineering
Sensor Technology

Background:

Optical displacement sensors often suffer from light source intensity drift, limiting their accuracy and range.
Absolute displacement measurement requires unambiguous position determination over a wide range.

Purpose of the Study:

To develop a novel wide-range absolute displacement sensor.
To overcome the limitations of conventional optical sensors, specifically light source intensity drift.
To achieve high accuracy and linearity in absolute displacement measurements.

Main Methods:

A sensor design based on the polarized light detection principle.
Utilizing two sets of polarized light detecting systems coupled by pulleys.
Implementing a solution to mitigate light source intensity drift.

Main Results:

A functional prototype and test bed were successfully constructed.
The sensor demonstrated a wide measurement range of 540 mm.
Achieved excellent linearity, with performance better than 0.05%.

Conclusions:

The novel polarized light-based sensor effectively achieves wide-range absolute displacement measurement.
The proposed method successfully addresses the challenge of light source intensity drift in optical systems.
The sensor exhibits high accuracy and linearity, meeting or exceeding design expectations.