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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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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.
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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Spectrally Tunable Sources for Advanced Radiometric Applications.

S W Brown1, J P Rice1, J E Neira1

  • 1Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899.

Journal of Research of the National Institute of Standards and Technology
|June 9, 2016
PubMed
Summary
This summary is machine-generated.

A new radiometric platform enables precise sensor and system performance evaluation using standardized light sources. This advanced tool aids in accurate instrument characterization, calibration, and algorithm testing.

Keywords:
calibrationcolorimetryphotometryradiometrysourcetunable source

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Area of Science:

  • Optical Engineering
  • Metrology
  • Instrumentation Science

Background:

  • Accurate characterization and calibration of optical sensors and systems are crucial for reliable data acquisition.
  • Existing methods for performance evaluation often lack standardization and flexibility.
  • The need for versatile platforms to quantify sensor performance across various applications is increasing.

Purpose of the Study:

  • To describe a novel radiometric platform for developing application-specific metrics.
  • To enable the quantification of sensor and system performance through accurate measurements.
  • To provide a basis for advanced instrument characterization, calibration, algorithm testing, and inter-instrument comparison.

Main Methods:

  • Development of a prototype radiometric platform.
  • Integration of spectrally programmable light sources.
  • Generation of complex spectral distributions in ultraviolet, visible, and short-wave infrared regions.
  • Application in radiometric, photometric, and colorimetric measurements.

Main Results:

  • The platform facilitates the creation of standardized metrics for sensor performance evaluation.
  • It allows for the quantification of performance based on the accuracy of measurements against known source distributions.
  • The programmable spectral source serves as a versatile tool for instrument characterization and calibration.

Conclusions:

  • The described radiometric platform offers a robust solution for advanced instrument characterization and calibration.
  • It provides a standardized approach for developing performance metrics for diverse sensors and systems.
  • The platform supports algorithm testing and facilitates reliable instrument comparisons across different applications.