What Is a Spectroradiometer?
A spectroradiometer is a device that analyzes the light emitted by a material across various wavelengths and frequencies. By distinguishing light’s spectral radiance, it determines the composition and characteristics of substances. Even if two light sources appear the same color to the human eye, they can have different spectral radiances. Therefore, to avoid discrepancies in perceived colors under different lighting conditions, a Spectroradiometer is essential for accurately measuring these differences.
Uses of Spectroradiometers
Spectroradiometers are used in diverse fields, such as:
- Chemical analysis for substance composition analysis.
- Materials research, environmental monitoring, and life sciences.
- Astronomy for analyzing celestial objects.
- Characterization of displays and lighting products, ensuring accurate color reproduction under various conditions.
Features of Spectroradiometers
Spectroradiometers measure light in terms of spectral radiance, expressed in units of W/sr/m2/nm-1 (watts per steradian per square meter per nanometer). They distinguish between different intensities of light based on wavelength, breaking down light into its spectra using a diffraction grating. The received light is converted into electrical signals to calculate spectral radiance. Most spectroradiometers also calculate other values such as luminance, tristimulus value XYZ, and chromaticity coordinate xy.
Types of Spectroradiometers
Various types of Spectroradiometers include:
1. Spectrophotometer
Measures light absorption at specific wavelengths and quantifies the absorbance. Commonly used for analyzing substance concentration and reaction progress.
2. Spectrofluorometer
Measures fluorescent light re-emitted upon light excitation absorbed by a substance. Utilized for analyzing substance properties and concentrations.
3. Spectro-Infrared Analyzer
Analyzes composition and structure by measuring the infrared spectrum absorbed by a substance. Employed in chemical analysis and materials research.