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Related Concept Videos

Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

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...
IR Spectrometers01:25

IR Spectrometers

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

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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...
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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. Samples for...

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Related Experiment Video

Updated: Jun 14, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Published on: December 30, 2025

Fourier approach to absolute spectroradiometry.

A J Farmer

    Applied Optics
    |March 25, 2010
    PubMed
    Summary

    Fourier spectroscopy enables precise absolute spectroradiometry in the visible spectrum. A novel quartz birefringent interferometer was developed and used for filter transmittance and silicon photodiode responsivity measurements.

    Area of Science:

    • Optical Physics
    • Spectroscopy
    • Metrology

    Background:

    • Accurate spectral measurements are crucial for optical instrumentation.
    • Fourier transform spectroscopy offers high resolution and throughput for spectroradiometry.
    • Development of specialized interferometers is key for advanced optical measurements.

    Purpose of the Study:

    • To apply Fourier spectroscopy to absolute spectroradiometry in the visible region.
    • To introduce a novel quartz birefringent interferometer for spectroradiometric applications.
    • To validate the instrument's performance through transmittance and responsivity measurements.

    Main Methods:

    • Development of a quartz birefringent interferometer.
    • Application of Fourier spectroscopy principles for spectral analysis.

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  • Measurement of spectral transmittance of broadband filters.
  • Intercomparison of relative spectral responsivities of silicon photodiodes.

    • Main Results:

    • Successful application of Fourier spectroscopy for absolute spectroradiometry.
    • Characterization of spectral transmittance for broadband filters.
    • Intercomparison of spectral responsivity for silicon photodiodes.
    • Preliminary data on the interferometer's spectral transmittance.

    Conclusions:

    • The developed quartz birefringent interferometer is suitable for absolute spectroradiometry.
    • The instrument facilitates accurate measurements of optical filter and photodiode properties.
    • Further characterization of the interferometer's transmittance is warranted.