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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...
Calibration Curves: Linear Least Squares01:20

Calibration Curves: Linear Least Squares

A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
For data that follow a straight line, the standard method for fitting is the linear...
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...
Calibration Curves: Correlation Coefficient01:10

Calibration Curves: Correlation Coefficient

In a linear calibration curve, there is a value called the calibration coefficient, denoted by 'r,' which measures the strength and the direction of association between two variables. The correlation coefficient value ranges from −1 to +1. A value of +1 indicates a perfect positive linear correlation, −1 denotes a perfect negative correlation, and 0 implies no correlation between the two variables. A positive correlation value establishes that as one variable increases, the other increases, and...
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...

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Updated: May 17, 2026

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements
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Calibration transfer based on maximum margin criterion for qualitative analysis using Fourier transform infrared

Yong Hu1, Silong Peng, Yiming Bi

  • 1Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, P.R. China. huyong821204@163.com

The Analyst
|November 2, 2012
PubMed
Summary

We developed a new calibration transfer method for Fourier Transform Infrared spectroscopy (FTIR) qualitative analysis. This method, CTMMC, improves spectral class separation, enhancing qualitative analysis performance over traditional techniques.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Chemometrics

Background:

  • Traditional calibration transfer methods like PDS are primarily for quantitative analysis.
  • Adapting these methods for qualitative analysis in FTIR spectroscopy presents challenges due to spectral variations.
  • Effective calibration transfer is crucial for reliable qualitative analysis across different measurement conditions.

Purpose of the Study:

  • To propose an improved calibration transfer method (CTMMC) for qualitative analysis in FTIR spectroscopy.
  • To enhance the separation of spectral data from different classes for better qualitative discrimination.
  • To evaluate the performance of the proposed CTMMC method against traditional techniques.

Main Methods:

  • Developed a novel calibration transfer method based on the maximum margin criterion (CTMMC).
  • CTMMC considers spectral changes and geometric characteristics of different spectral classes.
  • Comparative analysis of CTMMC against traditional calibration transfer methods using two datasets.

Main Results:

  • The proposed CTMMC method demonstrates superior performance in qualitative analysis compared to traditional methods.
  • CTMMC effectively separates spectra from different classes, improving classification accuracy.
  • Experimental results validate the effectiveness of CTMMC on diverse FTIR datasets.

Conclusions:

  • The CTMMC method offers a significant advancement for qualitative analysis in FTIR spectroscopy.
  • By maximizing class separation, CTMMC enhances the robustness and accuracy of qualitative analysis.
  • CTMMC provides a more effective solution for calibration transfer in qualitative FTIR applications.