Term
Explanation
VIS
Wavelengths from about 380 to 700 nanometers.
UV
Wavelengths from about 10 to 380 nanometers.
Total Spectral Flux
A measure of how quickly the power spectrumof a signal is changing, calculated by comparing the power spectrum for one frame against the power spectrum from the previous frame.
Total luminous Flux
A measure of the total amount of visible light emitted by a lamp.
Specular Reflectance
The ratio of the reflected light by a boundary interface to the incident light.
Spectroradiometer
A light measurement tool that is able to measure both the wavelength and amplitude of the light emitted from a light source.
Spectrometer
A scientific instrument used to separate and measure spectral components of a physical phenomenon.
Spectral Transmittance
The ratio of the transmitted power I(λ) to the incident power I0(λ) in a small interval of wavelength around the center wavelength λ and in a given (sufficiently small) solid angle of aperture.
Spectral Radiance
The radiance of a surface per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.
Spectral Irradiance
The irradiance of a surface per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.
Reflectance
The measure of the proportion of light or other radiation striking a surface which is reflected off it.
Radiometer
A device for measuring the radiant flux of electromagnetic radiation
GLOSSARY OF TERMS
Below is a list of the most commonly used terms found throughout the website.