DALTONISM: Related with vision that are color- blindness

DIE: small device that shape or finish the wire to new diameter. (Plastic deformation occurs)

DIFFUSE REFLECTION (surface scatter): The reflection from a rough surface that emerges at almost any angle

DIN: Deutsches Institut für Normung --Germany (Berlin) / German Standard Institute

DISLOCATIONS: linear defects in a crystal.

DUCTILITY: The property of metals that enables them to be mechanically deformed when cold, without fracture. In steel, ductility is usually measured by elongation and reduction of area as determined in a tensile test. Brittle materials experience little or no plastic deformation.

DYNAMIC RANGE: Is the ratio of the maximum signal radiance and the minimum signal radiance that can be controllably projected.

ELASTIC LIMIT: Maximum stress that a material will stand before permanent deformation occurs.

ELECTROMAGNETIC RADIATION: The field effects given off by accelerating a charged particle in a magnetic field. Depending on field strength and speed of acceleration, many types of electromagnetic radiation are created.

EMISSIVITY: The ability of an object to radiate and absorb energy from its surroundings measured as a ratio of the actual object emission to the blackbody equivalent emission

FACE CENTERED : (Concerning cubic space lattices) - Having equivalent points at the corners of the unit cell and at the centers of its six faces. A face-centered cubic space lattice is characteristic of one of the close-packed arrangements of equal hard spheres.

FAHRENHEIT: A temperature measurement scale which defines the ice point of water as 32 F and the boiling point of water as 212 F. Absolute zero is -459.7 F.

FIELD OF VIEW (FOV): The total field measured in angle within which objects can be imaged or measured and displayed by an infrared system.

FILTER (optical): An optical device, which modifies the characteristics of radiation, which is passed through it. Usually filters either attenuate all wavelengths of radiation a certain controlled amount or modify the optical pass band of the radiation - eliminating selected wavelengths or bands while allowing others to pass.

FRAME RATE: Is the rate at which an entire scene is change when every pixel is commanded to project a new value of signal radiance.

FRECUENCY (?): A property of a wave that describes how many wave patterns or cycles passes by in a period of time. Frequency is often measured in Hertz (Hz), where a wave with a frequency of 1 Hz will pass by at 1 cycle per second

GALVANIZING: Coating steel with zinc and tin (principally zinc) for rust proofing purposes. Formerly for the purpose of galvanizing, cut length steel sheets were passed singly through a bath of the molten metal. Today's galvanizing processing method consists of uncoiling and passing the continuous length of successive coils either through a molten bath of the metal termed Hot Dipped Galvanizing or by continuously zinc coating the uncoiled sheet electrolytically - termed Electro-Galvanizing.

HARD DRAWING: drawing metal wire through a die to reduce cross section and increase tensile strength.

HARD DRAWN: Wire or tubing drawn to high tensile strength by a high degree of cold work.