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

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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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Infrared (IR) Spectroscopy: Overview01:09

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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.
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Applications of IR Spectroscopy: Overview01:11

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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,...
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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.
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Related Experiment Video

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Fully Integrated Ultrathin Solid Immersion Grating Microspectrometer for Handheld Visible and Near-Infrared

Jung-Woo Park1,2, Jaehun Jeon1,2, Gi Beom Kim1,2

  • 1Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 18, 2023
PubMed
Summary
This summary is machine-generated.

A new compact spectrometer, the Solid Immersion Grating Microspectrometer (SIG-µSPEC), offers high spectral resolution for non-invasive fruit analysis. It accurately predicts soluble solid content (SSC) using spectral reflectance, showing great potential for point-of-care applications.

Keywords:
microspectrometerripeness predictionsolid immersion gratingspectral analysis

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Microsystems Engineering

Background:

  • Compact spectrometers face challenges in maintaining optical performance while reducing size.
  • Existing technologies often struggle with miniaturization without compromising spectral resolution.

Purpose of the Study:

  • To report a novel Solid Immersion Grating Microspectrometer (SIG-µSPEC) for high spectral resolution in a compact form factor.
  • To demonstrate the application of SIG-µSPEC for non-invasive fruit quality assessment.

Main Methods:

  • The SIG-µSPEC integrates a silicon microslit, index-matched lens, mirrors, solid immersion grating (SIG), and CMOS sensor.
  • The device utilizes the SIG for high angular dispersion on a planar focal plane.
  • Spectral reflectance of fruits at different ripening stages was measured.

Main Results:

  • Achieved an average spectral resolution of 5.8 nm with >76% sensitivity from 400-800 nm.
  • Clearly detected changes in the chlorophyll absorption band during fruit ripening.
  • Accurately predicted soluble solid content (SSC) with R² = 0.91 and a prediction-to-deviation ratio of 2.36.

Conclusions:

  • The SIG-µSPEC offers high spectral resolution and sensitivity in a compact size.
  • This microspectrometer enables precise, non-invasive spectral analysis for applications like fruit quality assessment.
  • The technology shows significant potential for point-of-care diagnostics and other fields requiring spectral analysis.