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Related Concept Videos

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

Raman Spectroscopy Instrumentation: Overview

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...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...

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Assembly, Tuning and Use of an Apertureless Near Field Infrared Microscope for Protein Imaging
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[Near infrared spectroscopy system structure with MOEMS scanning mirror array].

Biao Luo1, Zhi-Yu Wen, Zhong-Quan Wen

  • 1National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology, Micro-system Research Center of Chongqing University, Chongqing 400044, China. luobiaook@sina.com

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|January 17, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a novel Micro-Optical-Electro-Mechanical Systems (MOEMS) mirror array for cost-effective infrared spectrometers. The new design overcomes imaging irregularities, enabling precise spectral imaging for reflectance scans.

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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)
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Area of Science:

  • Optical Engineering
  • Spectroscopy
  • Micro-systems Engineering

Context:

  • Infrared spectrometers are essential for chemical analysis but often costly.
  • Existing Micro-Optical-Electro-Mechanical Systems (MOEMS) mirror arrays face challenges with imaging regularity in infrared spectroscopy.
  • High cost and imaging issues limit the widespread application of infrared spectrometers.

Purpose:

  • To develop a cost-effective infrared spectrometer using a novel MOEMS mirror array.
  • To resolve imaging irregularity problems associated with MOEMS mirror arrays in spectral imaging.
  • To design and optimize a new optical structure for improved infrared spectral imaging.

Summary:

  • A new MOEMS mirror array optical structure was designed and optimized using ZEMAX software for infrared spectroscopy (900-1400 nm).
  • The system achieves a theoretical resolution superior to 6 nm with a 50-micrometer slit width and a small imaging spot size (0.042 mm x 0.08 mm).
  • Design verification confirmed imaging regularity and feasibility for MOEMS mirror reflectance scans, validating the new spectrometer model.

Impact:

  • Enables the development of more affordable and high-performance infrared spectrometers.
  • Advances spectral imaging capabilities by overcoming previous limitations in MOEMS technology.
  • Provides a feasible platform for MOEMS mirror reflectance scanning and detector-micro-mirror angle analysis.