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IR Spectrometers

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...

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Related Experiment Video

Updated: Jun 17, 2026

Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses

Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses

Published on: August 9, 2019

A computer based spectroradiometer system.

|January 16, 2010

Summary

This study details a spectroradiometer system for measuring light source spectral energy distribution. The system uses digital integration and computer processing for accurate radiometry measurements.

Area of Science:

Optical Engineering
Radiometry
Spectroscopy

Background:

Radiometry presents significant experimental challenges.
Accurate spectral energy distribution measurements are crucial for light source characterization.

Purpose of the Study:

To describe a novel spectroradiometer system.
To address experimental challenges in radiometry.
To present a system for measuring spectral energy distribution from 0.25-2.5 micrometers.

Main Methods:

A single-beam optical arrangement.
Integration of photodetector signals over successive wavelength intervals.
Digital data recording and computer-based processing.

Main Results:

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Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

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Last Updated: Jun 17, 2026

Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses

Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses

Published on: August 9, 2019

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

Published on: December 2, 2017

The system successfully measures spectral energy distribution.
Accuracy and reproducibility of the spectroradiometer system are discussed.
Digital computer performs data processing and spectral plotting.

Conclusions:

The described spectroradiometer system offers a viable solution for radiometry challenges.
The system provides accurate and reproducible spectral energy distribution measurements.
Computer integration enhances data processing efficiency and accuracy.