- illuminance measurement
- измерение освещённости
English-russian dictionary of physics. 2013.
illuminance measurement
Смотреть что такое "illuminance measurement" в других словарях:
foot candle — (fc or ftc) a traditional unit of illuminance or illumination, defined as the illuminance received by a surface at a distance of one foot from a source of intensity one international candle. The international candle was the predecessor of the… … Dictionary of units of measurement
footcandle — (fc or ftc) a traditional unit of illuminance or illumination, defined as the illuminance received by a surface at a distance of one foot from a source of intensity one international candle. The international candle was the predecessor of the… … Dictionary of units of measurement
troland — (Td) a unit used in photometry to measure the amount of light reaching the retina of the eye. The retinal illuminance in trolands is equal to the luminance of the light shining on the eye, measured in candelas per square meter (cd/m2),… … Dictionary of units of measurement
lambert — (La or Lb or L) a CGS unit of luminance. Luminance is the luminous intensity of a surface, measuring the intensity of the light emitted (or reflected) in all directions per unit of area of the surface. One lambert is the luminance of a surface … Dictionary of units of measurement
lux — (lx) the SI unit for measuring the illumination (illuminance) of a surface. One lux is defined as an illumination of one lumen per square meter or 0.0001 phot. In considering the various light units, it s useful to think about light… … Dictionary of units of measurement
milliphot — (mph) a unit of illuminance or illumination equal to 0.001 phot or 10 lux … Dictionary of units of measurement
phot — (ph) the CGS unit of illuminance or illumination, equal to one lumen per square centimeter or 10 000 lux. See also lambert. The name is usually pronounced to rhyme with not rather than note … Dictionary of units of measurement
photon — 1. a quantum of light energy, or, more generally, of any form of electromagnetic energy having a single wavelength, direction, and polarization. 2. a former name for the unit of retinal illuminance now called the troland … Dictionary of units of measurement
Light meter — A light meter is a device used to measure the amount of light. In photography, a light meter is often used to determine the proper exposure for a photograph. Typically a light meter will include a computer, either digital or analogue, which… … Wikipedia
Display contrast — Contrast in visual perception is the difference in appearance of two or more parts of a field seen simultaneously or successively (hence: brightness contrast, lightness contrast, color contrast, simultaneous contrast, successive contrast, etc.).… … Wikipedia
optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… … Universalium
