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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...
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...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...

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Related Experiment Video

Updated: May 29, 2026

Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
07:51

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Published on: August 27, 2019

Accurate wavelength calibration method for flat-field grating spectrometers.

Xuewei Du1, Chaoyang Li, Zhe Xu

  • 1University of Science and Technology of China, Hefei, Anhui 230029, PR China.

Applied Spectroscopy
|September 21, 2011
PubMed
Summary

A new portable spectrometer prototype uses parameter fitting for accurate wavelength calibration. This method improves accuracy and aids in aligning optical components for better spectrometer performance.

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Area of Science:

  • Spectroscopy
  • Optical Engineering

Background:

  • Accurate wavelength calibration is crucial for spectrometer performance.
  • Flat-field grating spectrometers require precise calibration for reliable data acquisition.

Purpose of the Study:

  • To develop and present an accurate wavelength calibration method for portable spectrometers.
  • To investigate the use of parameter fitting for improved calibration accuracy and spectrometer alignment.

Main Methods:

  • Construction of a portable spectrometer prototype.
  • Development of a wavelength calibration model incorporating optical and structural parameters.
  • Application of parameter fitting to the calibration model.

Main Results:

  • Achieved higher calibration accuracy compared to existing methods.
  • The parameter fitting method accurately describes the wavelength-pixel position relationship.
  • The method provides insights into optical component installation errors.

Conclusions:

  • The proposed parameter fitting method offers superior wavelength calibration accuracy for spectrometers.
  • This technique is valuable for identifying and correcting optical component misalignment, enhancing spectrometer performance and reliability.