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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

4.4K
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.
4.4K
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

11.0K
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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IR Spectrometers01:25

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...
3.3K
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

940
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....
940
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

2.0K
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...
2.0K
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

1.7K
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...
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Related Experiment Video

Updated: Mar 23, 2026

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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A Portable Diode Array Spectrophotometer.

David Stephenson1

  • 1Department of Chemistry, University of the West Indies, St. Augustine, Trinidad and Tobago david.stephenson@sta.uwi.edu.

Applied Spectroscopy
|April 3, 2016
PubMed
Summary

A low-cost, portable visible light spectrometer was developed using common electronic components. This device offers a practical solution for spectral analysis with a 450-725 nm range and 5 nm resolution.

Area of Science:

  • Spectroscopy
  • Optical Engineering
  • Electronics

Background:

  • Visible light spectroscopy is crucial for material analysis.
  • Existing spectrometers can be expensive and lack portability.
  • Accessible instrumentation is needed for widespread scientific and educational applications.

Purpose of the Study:

  • To design and construct an affordable, portable visible light spectrometer.
  • To achieve a resolution better than 5 nm over the 450-725 nm wavelength range.
  • To create a user-friendly device with data storage capabilities.

Main Methods:

  • Utilized readily available electronic components and a diffraction grating for wavelength separation.
  • Employed a 128-element diode array for light detection.
Keywords:
Portable spectrophotometerdiode arraymicroprocessor

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  • Integrated a microprocessor for data analysis and a liquid crystal display (LCD) for real-time spectral visualization.
  • Incorporated a micro SD card slot for data logging.

    • Main Results:

    • The constructed spectrometer operates within the 450-725 nm visible light spectrum.
    • Achieved a spectral resolution of better than 5 nm.
    • The device is compact (120x65x60 mm) and lightweight (approx. 200 g).
    • Demonstrated a battery life of approximately 200 hours using 2xAAA batteries.

    Conclusions:

    • A cost-effective and portable visible light spectrometer has been successfully developed.
    • The device is suitable for various applications requiring spectral analysis due to its performance and portability.
    • Its simple construction makes it accessible for individuals with basic electronics knowledge.