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Related Concept Videos

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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Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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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...
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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

1.3K
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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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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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Spectral radiance calibration method for spectroradiometers based on diffraction aberration factors correction.

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    This study introduces a new spectral radiance calibration method to correct for errors caused by diffraction aberrations. The improved technique accurately measures targets that do not fully fill the spectroradiometer's field of view.

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    Area of Science:

    • Optical Engineering
    • Metrology

    Background:

    • Spectroradiometers are crucial for spectral radiance measurement.
    • Standard calibration methods introduce errors for partially filled fields of view (FOV) due to uncorrected diffraction aberrations.

    Purpose of the Study:

    • To develop a spectral radiance calibration method that corrects for diffraction aberration factors.
    • To improve measurement accuracy for targets not fully occupying the FOV.

    Main Methods:

    • Established a system using a collimator, blackbody, and pinhole to create an infinite point source.
    • Varied the incident angle of the point source to simulate different FOVs.
    • Calibrated diffraction aberration factors experimentally, demonstrating their spectral independence.

    Main Results:

    • The proposed method corrects for errors in spectral radiance measurements.
    • Diffraction aberration factors were found to be spectrally independent.
    • The method is effective for targets of various shapes and partial FOV occupancy.

    Conclusions:

    • The novel calibration method significantly enhances spectroradiometer accuracy.
    • Accounting for diffraction aberration factors is essential for precise measurements with partially filled FOVs.