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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

429
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...
429
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

414
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
414

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Related Experiment Video

Updated: Jul 9, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

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Involvement of free-space optics in Raman distributed temperature sensing.

Cheng-Kai Yao, Yibeltal Chanie Manie, Hung-Ming Chen

    Optics Letters
    |December 1, 2023
    PubMed
    Summary
    This summary is machine-generated.

    Free-space optics (FSO) successfully transmit Raman backscattering signals for distributed temperature sensing (DTS) via an air channel. This innovation offers a cost-effective, adaptable solution for temperature monitoring, overcoming installation challenges.

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    Area of Science:

    • Optics and Photonics
    • Sensing Technologies
    • Fiber Optics

    Background:

    • Distributed temperature sensing (DTS) traditionally relies on fiber optic cables.
    • Installation and repair of DTS cables face significant challenges due to cost and topographical constraints.
    • A need exists for alternative, flexible transmission methods for DTS.

    Purpose of the Study:

    • To demonstrate the efficacy of free-space optics (FSO) as a transition channel for transmitting Raman backscattering signals in DTS.
    • To evaluate the performance of an FSO link within a Raman-based DTS (RDTS) system.
    • To explore FSO's potential to overcome limitations of traditional DTS cable installations.

    Main Methods:

    • Integration of a free-space optics (FSO) link as a barrier-free air segment within a Raman-based DTS (RDTS) transmission route.
    • Transmission of RDTS pulses through the FSO link for low-loss propagation.
    • Collection and interpretation of Raman backscattered signals after traversing the FSO link.

    Main Results:

    • Successful transmission of Raman backscattering signals through the FSO air segment.
    • Minimal signal loss and temperature measurement accuracy maintained across the FSO link.
    • Temperature readings before and after the FSO link showed negligible differences.

    Conclusions:

    • Free-space optics (FSO) provide a viable and effective air transition channel for Raman-based distributed temperature sensing (RDTS).
    • This FSO-RDTS approach offers a promising solution to reduce the high costs and installation difficulties associated with conventional DTS fiber optic cables.
    • The technology addresses challenges posed by complex terrains, paving the way for more accessible and economical temperature monitoring solutions.