Colour fastness is a term used to measure the resistance to colour changes under specified conditions such as exposure to ultraviolet light, bleaching and fading.
Energy measuring is a term used to describe the light and radio waves, X-rays, and other forms of energy that transmitted through space as electromagnetic waves
Optical brightness or Optical Whiteners are chemicals make fabrics seem to show lighter than they do, to make them brighter they convert ultraviolet light to visible light in the blue region. They are sometimes used in the manufacture of fabrics and included in the formula of many detergents sold for home use.
Remote sensing is the art or science of telling something about an object without touching it (reconnaissance at a distance) It includes various methods of obtaining pictures or other forms of electromagnetic records of the Earth’s surface from a distance and the treatment and processing of the picture data.