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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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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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Related Experiment Video

Updated: Jun 16, 2026

Writing Bragg Gratings in Multicore Fibers
08:48

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Optical fiber refractometer based on cladding-mode Bragg grating.

Ming Han1, Fawen Guo, Yongfeng Lu

  • 1Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA. mhan3@unl.edu

Optics Letters
|February 4, 2010
PubMed
Summary
This summary is machine-generated.

This study presents a novel optical fiber refractometer using a Bragg grating. The sensor accurately measures refractive index while compensating for temperature variations, enabling multiplexed sensing.

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Published on: September 30, 2019

Area of Science:

  • Photonics and Optical Sensing
  • Fiber Optic Sensors
  • Nanophotonics

Background:

  • Refractive index sensing is crucial for various applications.
  • Existing fiber optic sensors face challenges with temperature cross-sensitivity.
  • Multiplexing capabilities are desired for enhanced sensing networks.

Purpose of the Study:

  • To develop a novel optical fiber refractometer.
  • To achieve accurate refractive index sensing.
  • To mitigate temperature cross-sensitivity and enable multiplexing.

Main Methods:

  • Utilizing a cladding-mode Bragg grating configuration.
  • Integrating a long-period grating (LPG) and a fiber Bragg grating (FBG).
  • Employing a reflection mode with wavelength-domain multiplexing.

Main Results:

  • Demonstrated a functional optical fiber refractometer.
  • Achieved refractive index sensing by coupling cladding mode light back to the core.
  • Successfully compensated for temperature cross-sensitivity using core mode reflection.

Conclusions:

  • The developed fiber optic refractometer offers accurate refractive index sensing.
  • The sensor design effectively addresses temperature cross-sensitivity.
  • The system supports wavelength-division multiplexing for scalable sensing applications.