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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...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...

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Related Experiment Video

Updated: Jun 27, 2026

A Stable Phantom Material for Optical and Acoustic Imaging
04:54

A Stable Phantom Material for Optical and Acoustic Imaging

Published on: June 16, 2023

Chromatic aberration measurement for transmission interferometric testing.

Kibyung Seong1, John E Greivenkamp

  • 1College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA.

Applied Optics
|December 17, 2008
PubMed
Summary

This study introduces a new method for measuring chromatic aberration using a Mach-Zehnder interferometer. The technique accurately quantizes optical element aberrations across multiple wavelengths.

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Area of Science:

  • Optical Engineering
  • Metrology

Background:

  • Chromatic aberration is a significant optical distortion affecting image quality.
  • Accurate measurement of chromatic aberration is crucial for optical system design and performance evaluation.

Purpose of the Study:

  • To present a novel method for measuring chromatic aberration.
  • To determine the chromatic aberrations of optical elements using interferometry.

Main Methods:

  • Utilized a Mach-Zehnder interferometer to obtain transmitted wavefront data.
  • Measured wavefronts at five distinct wavelengths.
  • Employed reverse ray tracing to correct for interferometer-induced aberrations.
  • Determined the absolute wavefront radius of curvature using a plano reference.

Main Results:

  • Successfully measured the chromatic aberrations of a singlet lens.
  • Quantified the chromatic aberrations of a doublet lens.

Conclusions:

  • The described method provides an accurate approach for chromatic aberration measurement.
  • This technique is applicable to various optical elements, including singlets and doublets.