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Related Concept Videos

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...
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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Related Experiment Video

Updated: Jun 12, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
08:23

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

Published on: September 30, 2019

Statistical-mode sensor for fiber optic vibration sensing uses.

W B Spillman, B R Kline, L B Maurice

    Applied Optics
    |June 18, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates a novel vibration sensing method using multimode optical fiber energy distribution. The technique effectively detects structural vibrations, personnel, and vehicles, offering versatile applications.

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    Last Updated: Jun 12, 2026

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    A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
    09:03

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

    Published on: January 7, 2019

    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensing
    • Vibration Analysis

    Background:

    • Traditional vibration sensors can be bulky, expensive, or susceptible to electromagnetic interference.
    • Multimode optical fibers offer a cost-effective and robust sensing medium.
    • Sensing based on changes in optical energy distribution is an emerging field.

    Purpose of the Study:

    • To demonstrate a novel vibration sensing method utilizing changes in the spatial energy distribution of multimode optical fiber output.
    • To develop and test two distinct implementations of this optical fiber vibration sensor.
    • To validate the sensor's performance through mathematical modeling and experimental testing.

    Main Methods:

    • Developed a vibration sensor based on detecting spatial energy distribution changes in multimode optical fiber output.
    • Implemented two sensor prototypes: one using spatial filtering of the fiber speckle pattern, and another using CCD array digital processing.
    • Created a mathematical model to accurately predict sensor behavior.

    Main Results:

    • Both sensor implementations successfully detected induced structural vibrations in laboratory settings.
    • Field tests confirmed the ability to detect personnel and vehicles over a buried, undetectable sensing cable.
    • The mathematical model showed strong agreement with experimental sensor performance.

    Conclusions:

    • The demonstrated optical fiber vibration sensing technique is effective and versatile.
    • The technology is compatible with standard components and allows for simultaneous telecommunication and sensing.
    • Potential applications include vibration sensing, intrusion detection, and acoustic sensing.