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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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...
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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).
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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Published on: July 25, 2022

Doubly multiplexed dispersive spectrometers.

M Harwit, P G Phillips, T Fine

    Applied Optics
    |January 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel double multiplexing scheme for dispersion instruments, enhancing light throughput and signal-to-noise ratio. The findings suggest these instruments rival interferometric spectrometers in performance.

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    Area of Science:

    • Optics and Spectrometry
    • Instrumental Science

    Background:

    • Traditional spectrometers face limitations in light throughput and signal acquisition.
    • Interferometric spectrometers offer advantages like Fellgett's advantage but can be complex.
    • Multiplexing techniques aim to improve spectrometer performance.

    Purpose of the Study:

    • To analyze the performance of a dispersion instrument utilizing double multiplexing.
    • To evaluate the potential of this design to achieve both Fellgett's and high throughput advantages.
    • To compare the performance of this doubly multiplexed spectrometer with existing interferometric designs.

    Main Methods:

    • Implementing a double multiplexing scheme in the entrance and exit slits of a dispersion instrument.
    • Evaluating spectrometer performance using various binary cyclic coding schemes.
    • Analyzing optical limitations inherent to doubly multiplexed systems.
    • Comparing performance metrics with Michelson interferometric spectrometers.

    Main Results:

    • The double multiplexing scheme successfully recovers Fellgett's advantage and high throughput.
    • Spectrometer performance was evaluated across different coding schemes.
    • Optical limitations were identified and discussed.
    • The doubly multiplexed dispersion instrument demonstrated favorable performance compared to Michelson interferometers.

    Conclusions:

    • Double multiplexing in dispersion instruments offers a viable alternative to interferometric spectrometers.
    • This approach effectively combines throughput and signal-to-noise advantages.
    • Laboratory results from a pilot model support the theoretical performance.