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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Updated: Apr 27, 2026

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

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

Published on: January 7, 2019

Frequency-shifted interferometry--a versatile fiber-optic sensing technique.

Fei Ye¹, Yiwei Zhang², Bing Qi³

¹The Edward S. Rogers Sr. Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada. fei.ye@mail.utoronto.ca.

Sensors (Basel, Switzerland)

|June 24, 2014

Summary

This summary is machine-generated.

Frequency-shifted interferometry (FSI) offers a versatile fiber-optic sensing technique. This review details FSI principles and applications, including length measurement and sensor multiplexing.

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Area of Science:

Optics and Photonics
Sensing Technology
Interferometry

Background:

Fiber-optic sensing is rapidly advancing with novel designs.
New sensing principles continuously emerge, creating new opportunities.
Frequency-shifted interferometry (FSI) is a key technique developed by the research group.

Purpose of the Study:

To review the frequency-shifted interferometry (FSI) technique.
To discuss FSI operation principles and implementations.
To highlight diverse applications of FSI in fiber-optic sensing.

Main Methods:

Utilizes a continuous-wave light source.
Incorporates an optical frequency shifter.
Employs a slow detector for signal processing.

Main Results:

Demonstrates FSI for fiber length and dispersion measurement.
Shows FSI's capability in locating weak reflections.
Highlights FSI for sensor multiplexing and cavity ring-down measurements.

Conclusions:

FSI is a powerful and adaptable fiber-optic sensing technique.
The review provides a comprehensive analysis of FSI systems.
FSI enables various advanced fiber-optic sensing applications.