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1) "Optical" -- As to optical pyrometers op·ti·cal
Pronunciation: 'äp-ti-k&l
Function: adjective
1 : of or relating to the science of optics
2 a : of or relating to vision : VISUAL b : VISIBLE 1 <optical wavelength> c : of, relating to, or being objects that emit light in the visible range of frequencies <an optical galaxy> d : using the properties of light to aid vision <an optical instrument>
3 a : of, relating to, or utilizing light especially instead of other forms of energy <optical microscopy> b : involving the use of light-sensitive devices to acquire information for a computer <optical character recognition>
4 : of or relating to optical art
- op·ti·cal·ly /-k(&-)lE/ adverb Pronunciation Symbols
Table of Opticks, 1728 Cyclopaedia Optics (ὀπτική appearance or look in ancient Greek) is a branch of physics that describes the behavior and properties of light and the interaction of light with matter. Optics explains optical phenomena. The field of optics usually describes the behavior of visible, infrared, and ultraviolet light; however because light is an electromagnetic wave, analogous phenomena occur in X-rays, microwaves, radio waves, and other forms of electromagnetic radiation. Optics can thus be regarded as a sub-field of electromagnetism. Some optical phenomena depend on the quantum nature of light relating some areas of optics to quantum mechanics. In practice, the vast majority of optical phenomena can be accounted for using the electromagnetic description of light, as described by Maxwell's Equations. Optics, as a field, is often considered largely separate from the physics community. It has its own identity, societies, and conferences. The pure science aspects of the field are often called optical science or optical physics. Applied optical sciences are often called optical engineering. Applications of optical engineering related specifically to illumination systems are called illumination engineering. Each of these disciplines tends to be quite different in its applications, technical skills, focus, and professional affiliations. More recent innovations in optical engineering are often categorized as photonics or optoelectronics. The boundaries between these fields and "optics" are often unclear, and the terms are used differently in different parts of the world and in different areas of industry. Because of the wide application of the science of "light" to real-world applications, the areas of optical science and optical engineering tend to be very cross-disciplinary. Optical science is a part of many related disciplines including electrical engineering, physics, psychology, medicine (particularly ophthalmology and optometry), and others. Additionally, the most complete description of optical behavior, as known to physics, is unnecessarily complicated for mos..."
2) "Pyrometers" -- As to optical pyrometers py·rom·e·ter
Pronunciation: pI-'rä-m&-t&r
Function: noun
Etymology: International Scientific Vocabulary
: an instrument for measuring temperatures especially when beyond the range of mercurial thermometers
- py·ro·met·ric /"pI-r&-'me-trik/ adjective
- py·ro·met·ri·cal·ly /-tri-k(&-)lE/ adverb
- py·rom·e·try /pI-'rä-m&-trE/ noun Pronunciation Symbols
A pyrometer is a temperature measuring device, which may consist of several different arrangements. It was invented by Pieter van Musschenbroek (1692-1761). A simple type of pyrometer uses a thermocouple placed either in the furnace or on the item to be measured. The voltage output of the thermocouple is read from a digital or analog meter calibrated in degrees Celsius (C) or Fahrenheit (F). There are many different types of thermocouple available, and these can be used to measure temperatures from −200 °C to above 1500 °C. The term can also be applied to the so-called optical pyrometer or radiation pyrometer, a class of non-contact instruments measuring temperatures above 600 °C. These are typically used to measure temperatures of glowing hot metals in a steel mill or foundry. See also the infrared thermometer. One of the most common non-contact pyrometers is the absorption-emission pyrometer which is a thermometer for determining gas temperature from measurement of the radiation emitted by a calibrated reference source before and after this radiation has passed through and been partially absorbed by the gas. Both measurements are made over the same wavelength interval. To measure the temperature of incandescent metals, you look through the pyrometer at the glowing metal, and turn a knob or ring which adjusts the temperature of a glowing filament projected into your field of view. When the color of the filament matches the color of the metal, you can read the temperature from a scale on the filament color adjusting knob/ring. The more common name for this type of instrument is a Disappearing Filament Pyrometer (DFP). DFPs were very dependent upon operator judgement in deciding when the filament had disappeared and often two people would not be able to agree on the temperature. DFPs are now old technology which have been replaced by modern Portable Infrared instruments which typically use a silicon sensor to measure the incoming radiation and have optical viewfinders with the temperature displayed in them.These instruments are state of the art with such features as emissivity correcti..."
Further Data On Term for optical pyrometers
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