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Related Concept Videos

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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...
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...

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Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
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Acousto-optic imaging spectropolarimetry for remote sensing.

D A Glenar, J J Hillman, B Saif

    Applied Optics
    |October 14, 2010
    PubMed
    Summary

    This study details noncollinear acousto-optic tunable filters (AOTFs) for narrow-band imaging. An AOTF imaging spectropolarimeter was built for astronomy, demonstrating its capability for spectral imaging.

    Area of Science:

    • Optics and Photonics
    • Astronomy Instrumentation
    • Acousto-Optics

    Background:

    • Noncollinear acousto-optic tunable filters (AOTFs) offer tunable spectral filtering capabilities.
    • Orthogonal polarization techniques are crucial for advanced imaging applications.
    • Challenges exist in imaging non-collimated light with existing AOTF systems.

    Purpose of the Study:

    • To review the operating principles of noncollinear AOTFs for narrow-band imaging.
    • To present the design and performance of a novel AOTF imaging spectropolarimeter for astronomical observations.
    • To address difficulties in imaging non-collimated light using AOTFs.

    Main Methods:

    • Theoretical review of noncollinear AOTF operating principles.
    • Spectral characterization and broadening measurements of commercial AOTFs.

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  • Construction and testing of a TeO(2) noncollinear AOTF imaging spectropolarimeter with CCD detectors.

    • Main Results:

    • Experimental measurements align with theoretical predictions for AOTF spectral characteristics.
    • Demonstrated successful imaging of orthogonally polarized spectral data.
    • Identified and analyzed challenges in imaging non-collimated light.

    Conclusions:

    • The developed AOTF imaging spectropolarimeter is suitable for ground-based astronomical applications.
    • The instrument effectively produces side-by-side orthogonally polarized spectral images.
    • Further investigation into imaging non-collimated light with AOTFs is warranted.