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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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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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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.
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X-ray Imaging

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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
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Updated: Jun 8, 2026

$Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing$

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing

Published on: April 25, 2019

Infrared collimator system.

|September 22, 2010

Summary

This summary is machine-generated.

A novel three-mirror system offers a compact alternative to off-axis parabolic mirrors. This innovative design provides a significantly larger diffraction-limited field of view, enhancing optical performance.

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Published on: November 25, 2009

Area of Science:

Optical Engineering
Optics and Photonics

Background:

Off-axis parabolic mirrors are commonly used as collimators in optical systems.
These systems can be bulky and have limitations in field of view.

Purpose of the Study:

To introduce and evaluate a compact three-spherical-mirror system as a replacement for off-axis parabolic mirror collimators.
To assess the performance benefits, specifically compactness and field of view, of the proposed system.

Main Methods:

A system comprising three spherical mirrors was designed and analyzed.
The system's compactness and diffraction-limited field of view were compared to traditional off-axis parabolic mirror collimators.

Main Results:

The three-spherical-mirror system demonstrated a more compact form factor compared to off-axis parabolic collimators.
The system achieved approximately 2.5 times larger diffraction-limited field of view.

Conclusions:

A three-spherical-mirror system is a viable and advantageous replacement for off-axis parabolic mirror collimators.
The proposed system offers significant improvements in size and field of view for optical applications.