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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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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.
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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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...
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Measuring Reaction Rates03:09

Measuring Reaction Rates

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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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UV–Vis Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

6.0K
The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
6.0K
IR Spectrometers01:25

IR Spectrometers

2.0K
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...
2.0K
UV–Vis Spectrum01:30

UV–Vis Spectrum

1.7K
When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar...
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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Passive UV imaging polarimeter.

Samuel Pellicori, Elliot Burke, Carol Martinez

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    Summary
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    A novel static polarimeter offers flexible spectral coverage from UV to near-IR. This compact, rugged instrument provides accurate polarization imagery for diverse applications without moving parts.

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    Scattering And Absorption of Light in Planetary Regoliths
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    Area of Science:

    • Optical instrumentation
    • Polarimetry
    • Remote sensing

    Background:

    • Polarimeters are crucial for analyzing light polarization.
    • Traditional polarimeters often involve complex mechanical or electro-optical components.
    • There is a need for robust, compact polarimetric systems for various scientific and industrial applications.

    Purpose of the Study:

    • To present the design and capabilities of a static polarimeter.
    • To demonstrate its adaptability for spectral ranges from <220 nm to ~2500 nm.
    • To highlight its suitability for diverse applications including atmospheric science and planetary missions.

    Main Methods:

    • Development of a static polarimeter utilizing thin-film components.
    • Implementation of simultaneous polarimetry without electro-optical or mechanical modulation.
    • Integration of an internal polarization calibrator for in-flight corrections.

    Main Results:

    • The static polarimeter exhibits design and application flexibility across a broad spectral range.
    • The instrument provides linear polarization-resolved imagery in four spectral passbands (~340 nm to ~415 nm).
    • The compact, lightweight, and rugged architecture ensures high polarimetric accuracy with low instrumental polarization.

    Conclusions:

    • The static polarimeter is a versatile and accurate instrument for polarization measurements.
    • Its robust design and broad spectral coverage make it suitable for demanding scientific and commercial applications.
    • The absence of moving parts enhances reliability and simplifies operation for remote sensing and other fields.