enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Ultraviolet - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet

    The vacuum ultraviolet (VUV) band (100–200 nm) can be generated by non-linear 4 wave mixing in gases by sum or difference frequency mixing of 2 or more longer wavelength lasers. The generation is generally done in gasses (e.g. krypton, hydrogen which are two-photon resonant near 193 nm) [ 44 ] or metal vapors (e.g. magnesium).

  3. UV mapping - Wikipedia

    en.wikipedia.org/wiki/UV_mapping

    UV mapping is the 3D modeling process of projecting a 3D model's surface to a 2D image for texture mapping. The letters "U" and "V" denote the axes of the 2D texture because "X", "Y", and "Z" are already used to denote the axes of the 3D object in model space, while "W" (in addition to XYZ) is used in calculating quaternion rotations, a common ...

  4. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    In frequency (and thus energy), UV rays sit between the violet end of the visible spectrum and the X-ray range. The UV wavelength spectrum ranges from 399 nm to 10 nm and is divided into 3 sections: UVA, UVB, and UVC. UV is the lowest energy range energetic enough to ionize atoms, separating electrons from them, and thus causing chemical reactions.

  5. Spectrophotometry - Wikipedia

    en.wikipedia.org/wiki/Spectrophotometry

    There are two major classes of devices: single-beam and double-beam. A double-beam spectrophotometer [13] compares the light intensity between two light paths, one path containing a reference sample and the other the test sample. A single-beam spectrophotometer measures the relative light intensity of the beam before and after a test sample is ...

  6. Visible spectrum - Wikipedia

    en.wikipedia.org/wiki/Visible_spectrum

    violet/ultraviolet sensitive (VS/UVS) with peak sensitivity between 355–435 nm. Testing the visual systems of animals behaviorally is difficult, so the visible range of animals is usually estimated by comparing the peak wavelengths of opsins with those of typical humans (S-opsin at 420 nm and L-opsin at 560 nm).

  7. Ultraviolet–visible spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet–visible...

    A 2nd order polynomial relationship between absorption and concentration is sometimes encountered [13] for very large, complex molecules such as organic dyes (xylenol orange or neutral red, for example). [14] [15] UV–Vis spectroscopy is also used in the semiconductor industry to measure the thickness and optical properties of thin films on a ...

  8. CIELUV - Wikipedia

    en.wikipedia.org/wiki/CIELUV

    CIELUV is an Adams chromatic valence color space and is an update of the CIE 1964 (U*, V*, W*) color space (CIEUVW). The differences include a slightly modified lightness scale and a modified uniform chromaticity scale, in which one of the coordinates, v′, is 1.5 times as large as v in its 1960 predecessor.

  9. Blacklight - Wikipedia

    en.wikipedia.org/wiki/Blacklight

    Blacklight fluorescent tubes. The violet glow of a blacklight is not the UV light itself, but visible light that escapes being filtered out by the filter material in the glass envelope. A blacklight, also called a UV-A light, Wood's lamp, or ultraviolet light, is a lamp that emits long-wave ultraviolet light and very little visible light.