Spectroradiometry, the measurement of absolute optical radiation at each wavelength, is applicable to a variety of settings, including measuring the spectral energy output of a lamp, LED display, or other light source to determination of the flux of sunlight reaching a forest floor or other scene.
Unlike other science research fields where it is possible to collect a sample and transport it to an instrument for measurement, characterizing spectral flux requires bringing the instrument to the measurement site for in-situ analysis.
Learn more about spectroradiometry and radiometric calibration.
Many kinds of eyes exist, but there is no progression of eye designs from simple to complex in the fossils.
ASD spectroradiometers are calibrated using a NIST-traceable, 1000W quartz-halogen lamp and a highly regulated power supply, producing a known irradiance, on a standardized Spectralon diffuse reflectance panel.
The data are downloaded into a calibration file that is accessible when the instrument is placed into the radiance mode and a spectrum is measured.
Consider, for example, the use of a timeline or sequence of events.