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Unsymmetric Bending - Angle of Neutral Axis

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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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Published on: November 7, 2016

Temperature-Compensated Vector Bending Sensor with Double-Cladding Fiber Assisted Mach-Zehnder Interferometer.

Wenchao Li¹, Hongye Wang², Shuqin Wang¹

¹College of Computer and Control Engineering, Northeast Forestry University, Harbin 150040, China.

Biomimetics (Basel, Switzerland)

|February 26, 2026

Summary

This study introduces a novel vector bending sensor for bionic robots. The Mach-Zehnder interferometer (MZI) based sensor offers accurate curvature measurement with temperature compensation and direction sensing capabilities.

Keywords:

Mach-Zehnder interferometer fiber-optic sensor vector bending sensor

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Last Updated: Jul 14, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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Published on: November 7, 2016

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

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Published on: September 30, 2019

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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Published on: January 7, 2019

Area of Science:

Robotics and Mechanical Engineering
Optical Sensing Technologies
Materials Science

Background:

Vector bending sensing is crucial for advanced bionic robot design.
Existing sensors often lack multifunctionality, temperature compensation, or directional sensing capabilities.
Accurate and compact sensors are needed for sophisticated robotic applications.

Purpose of the Study:

To propose and experimentally investigate a novel vector bending sensor with temperature compensation.
To leverage a Mach-Zehnder interferometer (MZI) for enhanced sensing performance.
To demonstrate the sensor's capabilities in curvature measurement, direction sensing, and temperature compensation.

Main Methods:

Implementation of an MZI using an off-axis splice between single-mode fiber (SMF) and double-cladding fiber (DCF).
Comprehensive theoretical analysis of the sensor's optical properties and bending response.
Experimental validation of the sensor's performance, including sensitivity, size, and compensation capabilities.

Main Results:

Achieved high curvature sensitivity of -8.311 nm/m^-1.
Developed a compact sensor with a size as small as 3 mm.
Successfully demonstrated simultaneous direction sensing and temperature compensation.
Validated high accuracy and multifunctionality for curvature measurement.

Conclusions:

The proposed vector bending sensor offers a promising solution for accurate curvature measurement in bionic robots.
Its compact size, high sensitivity, multifunctionality, and temperature compensation make it suitable for various robotic applications.
This fiber-optic sensor represents a significant advancement in the field of bionic robot design and sensing.