In magnetic particle inspection, light in the near ultraviolet range of wavelengths, just shorter than visible light. |
Related Terms |
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ELECTROMAGNETIC WAVES
Waves of associated electric and magnetic fields characterized by variations of the fields. The electric and magnetic fields are at right angles to each other and to the direction of propagation. The waves are propagated at the speed of light and are known as radio (Hertzian) waves, infrared rays, light, ultraviolet rays, X-rays, etc., depending on their frequencies. |
DECLINATION VARIOMETER
An instrument that measures changes in the declination of the earth's magnetic field, consisting of a permanent bar magnet, usually about 0.4 inch (1 centimeter) long, suspended with a plane mirror from a fine quartz fiber 26 inches (515 centimeters) in length; a lens focuses to a point a beam of light reflected from the mirror to recording paper mounted on a rotating drum. Also known as D variometer. |
FRONT LIGHT
The closer of two range lights. It is the lowest of the lights of an established range. Also called LOW LIGHT |
IONOSPHERIC DISTURBANCE
A sudden outburst of ultraviolet light on the sun, known as a SOLAR FLARE or CHROMOSPHERIC ERUP- TION, which produces abnormally high ionization in the region of the D-layer. The result is a sudden increase in radio wave absorption, with particular severity in the upper mediu |
ABERRATION
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GALVANOMETER RECORDER
[ENG ACOUS] A sound recorder in which the audio signal voltage is applied to a coil suspended in a magnetic field; the resulting movements of the coil cause a tiny attached mirror to move a reflected light beam back and forth across a slit in front of a moving photographic film. |
RETRO-REFLECTING MATERIAL
A material which produces retro-reflection over a wide range of angles of incidence of a light beam, by use of a large number of very small reflecting and refracting elements, usually very small beads. |
MAJOR LIGHT.
A light of high intensity and reliability exhibited from a fixed structure or on marine site (except range lights). Major lights include primary seacoast lights and secondary lights. |
MAGNETIC RANGE
A range oriented in a given magnetic direction and used to assist in the determination of the deviation of a magnetic compass. |
ULTRAVIOLET
Electromagnetic radiation with wavelengths between visible light and x-rays. |