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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

466
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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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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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...
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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IR Spectrometers01:25

IR Spectrometers

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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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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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High-speed RF spectral analysis using a Rayleigh backscattering speckle spectrometer.

Matthew J Murray, Joseph B Murray, Ross T Schermer

    Optics Express
    |June 29, 2023
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    Summary
    This summary is machine-generated.

    This study introduces an optical radio frequency (RF) spectrum analyzer for continuous, wideband surveillance. The novel system achieves 15 GHz bandwidth and MHz resolution using fiber optics, overcoming electronic limitations.

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    Area of Science:

    • Photonics and Optical Engineering
    • Electrical Engineering
    • Signal Processing

    Background:

    • Persistent wideband radio frequency (RF) surveillance is crucial due to increasing wireless and RADAR technologies.
    • Conventional electronic spectrum analyzers are limited by analog-to-digital converter (ADC) bandwidth and continuous operation capabilities.
    • Existing methods often capture only short snapshots of the RF spectrum, hindering comprehensive analysis.

    Purpose of the Study:

    • To develop an optical RF spectrum analyzer for continuous, wideband operation.
    • To overcome the bandwidth and data rate limitations of current electronic RF spectrum analysis techniques.
    • To enable high-resolution, high-speed RF spectral analysis for advanced detection and monitoring.

    Main Methods:

    • Encoding the RF spectrum onto optical sidebands carried by an optical signal.
    • Utilizing a speckle spectrometer to measure the encoded optical sidebands.
    • Employing Rayleigh backscattering in single-mode fiber to generate rapid, wavelength-dependent speckle patterns.
    • Implementing a dual-resolution scheme to optimize the trade-off between bandwidth, resolution, and measurement rate.

    Main Results:

    • Demonstrated a continuous, wideband (15 GHz) optical RF spectrum analyzer.
    • Achieved MHz-level spectral resolution and a fast update rate of 385 kHz.
    • The system is built using fiber-coupled, off-the-shelf components.

    Conclusions:

    • The developed optical RF spectrum analyzer offers a powerful new approach for wideband RF detection and monitoring.
    • This photonic system surpasses the limitations of conventional electronic methods for continuous spectral analysis.
    • The use of fiber-based speckle spectroscopy provides a scalable and efficient solution for modern RF surveillance needs.