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Related Concept Videos

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.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
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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.
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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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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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Raman Spectroscopy Instrumentation: Overview01:26

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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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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
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Spectral Reflectance Measurements.

John Stamford1, Piotr Kasznicki1, Tracy Lawson2

  • 1School of Life Sciences, University of Essex, Colchester, UK.

Methods in Molecular Biology (Clifton, N.J.)
|April 22, 2024
PubMed
Summary
This summary is machine-generated.

This guide details using spectral reflectance for plant health assessment. It covers spectrometer measurements and multispectral imaging to quantify leaf traits like pigment and water content.

Keywords:
Anthocyanin contentCalibrationChlorophyll contentMultispectral cameraMultispectral imagingSpectral indicesSpectral reflectanceSpectrometerWater contentXanthophyll cycle

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Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses
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Area of Science:

  • Plant Science
  • Remote Sensing
  • Spectroscopy

Background:

  • Accurate plant health assessment is crucial for agriculture and ecology.
  • Spectral reflectance offers a non-destructive method to evaluate plant physiological status.
  • Understanding leaf spectral properties can reveal key plant traits.

Purpose of the Study:

  • To provide a comprehensive methodology for plant health and leaf characteristic evaluation using spectral reflectance.
  • To guide researchers and practitioners in applying spectrometers and multispectral imaging techniques.
  • To demonstrate the application of spectral indices for quantifying plant traits.

Main Methods:

  • High-resolution point measurements of leaf spectral reflectance using spectrometers.
  • Multispectral imaging for capturing spatial data on leaf characteristics.
  • Detailed procedures for spectrometer calibration, data collection, and image processing.
  • Application of spectral indices to quantify pigment content, xanthophyll cycle status, and water content.

Main Results:

  • A standardized framework for plant health assessment using spectral reflectance data.
  • Identification of key spectral regions for specific plant trait analysis.
  • Demonstrated ability to quantify pigment, water, and xanthophyll cycle status through spectral indices.

Conclusions:

  • Spectral reflectance is a powerful tool for non-invasive plant health and trait evaluation.
  • Standardized methodologies in spectral data acquisition and analysis are essential for reliable results.
  • This chapter provides a practical guide for advancing plant science research through spectral analysis.