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Related Concept Videos

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...
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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.
Different compounds display unique properties due to their...

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Related Experiment Video

Updated: Jun 14, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Acoustooptic refractive infrared chopper.

M Gottlieb, F Schaff

    Applied Optics
    |March 25, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an infrared chopper utilizing acoustic waves in germanium. The device effectively modulates infrared light, showing strong agreement between theoretical predictions and experimental outcomes.

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    Area of Science:

    • Optoelectronics
    • Acousto-optics
    • Infrared Technology

    Background:

    • Infrared choppers are crucial for modulating optical signals.
    • Acoustic waves can influence light propagation through materials.

    Purpose of the Study:

    • To analyze an infrared chopper based on acoustic wave refraction.
    • To develop and validate computer models for chopper performance.

    Main Methods:

    • Theoretical analysis of light ray refraction by acoustic waves.
    • Development of computer programs for ray tracing.
    • Calculation of contrast ratio at a detector.
    • Experimental validation using a germanium device.

    Main Results:

    • The infrared chopper operates by refracting light with a low-frequency acoustic wave.
    • Computer simulations accurately predict the behavior of light rays.
    • Experimental results closely match theoretical calculations for the germanium chopper.

    Conclusions:

    • The developed infrared chopper design is effective.
    • Acousto-optic modulation using standing acoustic waves is a viable technique.
    • The theoretical model and experimental results demonstrate good agreement.