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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

1.2K
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...
1.2K
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

1.4K
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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Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

3.3K
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...
3.3K
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

435
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...
435
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

468
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...
468
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

818
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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O-cresol Concentration Online Measurement Based On Near Infrared Spectroscopy Via Partial Least Square Regression
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OSpRad: an open-source, low-cost, high-sensitivity spectroradiometer.

Jolyon Troscianko1

  • 1Centre for Ecology and Conservation, University of Exeter, Penryn Campus, Treliever Road, Penryn, Cornwall TR10 9FE, UK.

The Journal of Experimental Biology
|June 19, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces an affordable, open-source spectroradiometry system (OSpRad) for sensitive light measurements. The OSpRad system overcomes cost barriers, enabling research in fields like artificial light at night (ALAN).

Keywords:
ALANArtificial lightLight measurementLight pollutionSpectrometrySpectroradiometryVisual ecology

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Area of Science:

  • Instrumentation and Measurement
  • Environmental Science
  • Biophysics

Background:

  • Spectroradiometry is crucial across scientific disciplines but often limited by cost and accessibility.
  • Researching artificial light at night (ALAN) requires high sensitivity to low light levels across the UV to visible spectrum.

Purpose of the Study:

  • To develop an open-source spectroradiometry (OSpRad) system that is affordable and highly sensitive.
  • To address the challenges of cost and accessibility in spectroradiometry, particularly for ALAN research.

Main Methods:

  • Utilized an affordable miniature spectrometer chip (Hamamatsu C12880MA).
  • Integrated an automated shutter, cosine-corrector, and microprocessor controller.
  • Developed a graphical user interface (GUI) app compatible with smartphones and desktop computers.

Main Results:

  • Achieved high ultraviolet sensitivity.
  • Capable of measuring spectral radiance at 0.001 cd m⁻² and irradiance at 0.005 lx.
  • The system covers most real-world night-time light levels.

Conclusions:

  • The OSpRad system offers a low-cost, high-sensitivity solution for spectroradiometry.
  • Its capabilities make it suitable for diverse spectrometry applications and ALAN research.
  • Promotes wider accessibility to advanced light measurement technology.