Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Discrete Fourier Transform01:15

Discrete Fourier Transform

455
The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
455
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

1.3K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
1.3K
Distance Measurements by Taping01:18

Distance Measurements by Taping

131
Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
131
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

1.2K
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
1.2K
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

1.1K
In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
1.1K
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

3.1K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
3.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Acoustic Signal Recognition of Partial Discharge Optical Fiber Sensors Using Time-Frequency Phase Composition.

Sensors (Basel, Switzerland)·2026
Same author

Optical Fiber Vibration Sensor Using Least Mean Square Error Algorithm.

Sensors (Basel, Switzerland)·2020
Same author

A permutation method for detecting trend correlations in rare variant association studies.

Genetics research·2019
Same author

Eliminating Phase Drift for Distributed Optical Fiber Acoustic Sensing System with Empirical Mode Decomposition.

Sensors (Basel, Switzerland)·2019
Same author

Three-dimensional biomass derived hard carbon with reconstructed surface as a free-standing anode for sodium-ion batteries.

Journal of colloid and interface science·2019
Same author

Lead bioaccessibility in farming and mining soils: The influence of soil properties, types and human gut microbiota.

The Science of the total environment·2019

Related Experiment Video

Updated: Oct 3, 2025

Author Spotlight: Characterizing Environmental Biofilm Mechanics Using Optical Coherence Elastography and its Applications in Wastewater Treatment
04:51

Author Spotlight: Characterizing Environmental Biofilm Mechanics Using Optical Coherence Elastography and its Applications in Wastewater Treatment

Published on: March 1, 2024

1.1K

Envelope Extraction for Vibration Locating in Coherent Φ-OTDR.

Wei Zan1, Yu Wang1, Xin Liu2

  • 1Key Laboratory of Advanced Transducers and Intelligent Control Systems (Ministry of Education and Shanxi Province), College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China.

Sensors (Basel, Switzerland)
|February 15, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces envelope extraction for phase-sensitive optical time-domain reflectometry (Φ-OTDR) systems. This method simplifies vibration locating and reduces hardware demands by lowering the required sampling rate.

Keywords:
beating signalenvelope extractionphase-sensitive optical time-domain reflectometryvibration locating

More Related Videos

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

7.0K
Label-free Single Molecule Detection Using Microtoroid Optical Resonators
08:53

Label-free Single Molecule Detection Using Microtoroid Optical Resonators

Published on: December 29, 2015

9.4K

Related Experiment Videos

Last Updated: Oct 3, 2025

Author Spotlight: Characterizing Environmental Biofilm Mechanics Using Optical Coherence Elastography and its Applications in Wastewater Treatment
04:51

Author Spotlight: Characterizing Environmental Biofilm Mechanics Using Optical Coherence Elastography and its Applications in Wastewater Treatment

Published on: March 1, 2024

1.1K
Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

7.0K
Label-free Single Molecule Detection Using Microtoroid Optical Resonators
08:53

Label-free Single Molecule Detection Using Microtoroid Optical Resonators

Published on: December 29, 2015

9.4K

Area of Science:

  • Optical sensing
  • Photonics
  • Signal processing

Background:

  • Coherent phase-sensitive optical time-domain reflectometry (Φ-OTDR) systems typically require high-frequency signal acquisition due to high central frequencies in beating signal spectra.
  • High-performance hardware for signal acquisition increases system cost and complexity.

Purpose of the Study:

  • To propose and validate a novel coherent Φ-OTDR system based on envelope extraction.
  • To reduce the hardware requirements for signal acquisition in Φ-OTDR systems.
  • To simplify the data demodulation process for vibration locating.

Main Methods:

  • Development of a theoretical model for the quasi-sinusoidal amplitude-modulated beating signal between local oscillator light and Rayleigh backward scattering light.
  • Utilization of an envelope detector for efficient envelope extraction of the beating signals.
  • Direct application of the extracted envelope for vibration locating, bypassing conventional orthogonal demodulation.

Main Results:

  • Successful implementation of envelope extraction for vibration locating in a coherent Φ-OTDR system.
  • Demonstration of reduced sampling rate capability down to 10 MHz.
  • Validation of the system's performance with a spatial resolution of 10 m and a sensing distance of 31 km.

Conclusions:

  • Envelope extraction is a reliable and effective technique for vibration locating in coherent Φ-OTDR systems.
  • The proposed method significantly reduces the necessary sampling rate, simplifying hardware requirements.
  • The envelope extraction approach offers a simplified data demodulation pathway for Φ-OTDR sensing applications.