Optical radiometry is the science of light measurement, spanning across the ultraviolet, visible and infrared regions of the electromagnetic spectrum. Photometry is the subset of radiometry ... more
Optical radiometry is the science of light measurement, spanning across the ultraviolet, visible and infrared regions of the electromagnetic spectrum. Photometry is the subset of radiometry dedicated to the measurement of visible light as it is perceived by the average human eye.
International Light Technologies (ILT) has been the most respected name in research oriented light measurement for 40 years. They offer a variety of modular light meters. Optical radiation is perhaps the most difficult form of energy to measure accurately. Light energy is distributed over wavelength, position, direction, time and polarization.
A light meter or a radiometric light measurement system must be designed to measure the distribution of energy over one parameter while holding all others constant. In addition to high levels of measurement uncertainty, the field of radiometry and photometry has been characterized by confusion of terminology, symbols, definitions and units. International Light Technologys goal is to provide customers with light measurement solutions to these problems by offering a comprehensive line of accurate modular light meters, i.e. radiometers and photometers. There are many (low-cost) instruments called radiometers on the market, which were designed to measure power from a light source with a constant known spectrum. These give erroneous results when measuring any other radiation.
The extremely flexible light measuring system concept of International Light Technology is based on a choice of suitable radiometer display devices and a wide range of different detectors. As a special feature the detector head allows a custom-designed modular configuration by using special matched filters and input optics.
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