The lights floodlight or stroboscopic lamp , commonly called strobe , are devices used to generate ordinary flashes of light. This is one of a number of devices that can be used as a stroboscope. This word is derived from the Greek strobos (Greek: ??????? ), which means "spin action."
The typical commercial strobe lights have flash energy in the region of 10 to 150 joules, and short discharge times of several milliseconds, often resulting in several kilowatts of flash power. Larger strobe lights can be used in "sustainable" mode, resulting in very intense illumination.
Light sources are usually xenon flash, or flashtube , which has a complex spectrum and a color temperature of about 5,600 kelvins. To get colored light, colored gel can be used.
Video Strobe light
Scientific explanation of flashtub
Strobe lights typically use a flashtub with energy supplied from a capacitor, an energy storage device such as a battery, but capable of filling and releasing energy faster. Recently, some strobe lights have been found using main power repaired and no capacitors at all. In a capacitor-based strobe light, the capacitor is charged to about 300 V. Once the capacitor is charged, a small amount of power is transferred to the transformer trigger, a small transformer with a high rotation ratio. This produces a low voltage spike but the height required to ionize the xenon gas in a flash tube. The bow is made inside the tube, which serves as a bridge for a much larger pulse to flow down later. Arcs present almost immediate short circuits, allowing capacitors to rapidly release their energy to the arc. It quickly heats the xenon gas, creating a very bright plasma release, which is seen as a flash.
A strobe without a capacitor storage device only releases an electric voltage across the tube after being fired. This type of strobe does not require charging time and allows faster flash speed, but drastically reduces the life of the flash tube if it is turned on for a significant period of time. The lamp needs a current limiting form, because as mentioned above, the bow acts as a kind of short circuit. If this current limiter is to be removed, the flash tube will attempt to draw high currents from the power source, potentially tripping the electric circuit breaker or causing a voltage drop across the power supply channel.
The individual strobe flickers usually only last about 200 microseconds, but can be maintained for larger or smaller periods depending on the intended use of the strobe. Some strobe even offer sustainable mode of operation in which the arc is maintained, providing very high intensity light, but usually only for a small amount of time to prevent overheating and ultimately damage the flash tube.
Maps Strobe light
Apps
Stroboscopic effect
Specific calibrated strobe lights, capable of flashing up to hundreds of times per second, are used in industry to stop the emergence of rotating motion and other machines that operate over and over and to measure, or adjust, rotation speed or cycle time. As this is only visible, the point marked on the rotating body will appear to be moving backward or forward, or immobile, depending on the strobe-flash frequency. If the flash occurs equal to the rotation period (or equally multiplied, ie 2 *? * N/?, where n is an integer and? Angular frequency) the point marked will appear to not move. Any non integer flash setting will make the mark appear to move forward or backward, e.g. a slight increase in the frequency of the flash will make the point appear to move backwards.
Strobe lighting has also been used to view the movement of the vocal cords in slow motion during speech, a procedure known as video-stroboscopy. A common use of strobe flash is to optimize the efficiency of a car engine in a certain rotation period by directing the strobe-light toward the mark on the flywheel on the main axle of the machine. The spotlight tool for this ignition timing is called a time light.
More
Strobe lights are used in scientific and industrial applications, in clubs where they are used to give the illusion of slow motion, and are often used for aircraft crash-proof illumination both on the aircraft itself and also on high stationary objects, such as television and radio towers. Other applications are in alarm systems, emergency vehicle lights, theater lighting (especially for lightning simulation), and high-visibility running lights. They are still widely used in law enforcement and other emergency vehicles, although they are slowly being replaced by LED technology in these applications, as they themselves replace halogen lighting. Blits are used by scuba divers as emergency signal devices.
Strobelights are often used in nightclubs and raves, and are available for home use for special effects or entertainment.
History
The origins of strobe lighting dated 1931, when Harold Eugene "Doc" Edgerton used flashing lights to make an improved stroboscope to study moving objects, eventually producing dramatic photographs of objects such as bullets in flight.
EG & amp; G [ now URS division ] was founded by Harold E. Edgerton, Kenneth J. Germeshausen and Herbert E. Grier in 1947 as Edgerton, Germeshausen and Grier, Inc. and today bears their initials. In 1931, Edgerton and Germeshausen have established partnerships to study high-speed stroboscopic and photographic techniques and their applications. Grier joined them in 1934, and in 1947, EG & amp; G was founded. During World War II, the Manhattan Government project made use of Edgerton's discovery to photograph atomic explosions; it is a natural evolution that the company will support the Atomic Energy Commission in its research and development of armaments after the war. This work for the Commission provides a historic foundation for the company's technology base today.
Internally trigger Strobotrons (available light output optimized thyratrons) as well as CRT-type flood beam, network control Stroboscopic light source vacuum with fast phosphorus.
Spotlights were popularized on the club scene during the 1960s when used to reproduce and enhance LSD travel effects. Ken Kesey uses a strobe light that coordinates with Grateful Dead music during his legendary Acid Tests. In early 1966 Andy Warhol's light engineer Danny Williams pioneered the use of multiple stroboscopes, slides and projections simultaneously on stage during the 1966 Exploding Plastic Inevitable show, and at the request of Bill Graham, Williams built an enhanced stroboscopic light show for use at Fillmore West.
Strobe and epileptic light
Sometimes strobe lighting can trigger seizures in photosensitive epilepsy. A famous event occurred in 1997 in Japan when an episode of the anime Pokémon mon, Denn? Senshi Porygon (commonly translated as Electric Soldier Porygon ), featuring scenes depicting large explosions using blinking red and blue lights, causing around 685 of the children seen to be sent to the hospital. This is a very bright spotlight. They involve many colors with a strobe effect of about 12 Hz. Although 95% of 685 only complain of dizziness, some are hospitalized. The organizers later said they did not know about the flaming threshold.
Most strobe lights sold to the public are limited to manufacturers about 10-12 Hz (10-12 blitz per second) on their internal oscillators, although external strobe lights are triggered often will blink as often as possible. Studies have shown that most people who are susceptible to strobing effects can have symptoms at 15 Hz-70 Hz, although rarely. Other studies have shown symptoms of epilepsy at a rate of 15 Hz with more than 90 seconds continuously staring at the spotlights. No seizures are known at or below 8 Hz (or 8 winks per second). Many fire alarms in schools, hospitals, stadiums, etc. Strobe at level 1 Hz.
See also
- Electrotachyscope
- Tachometer
- Zoetrope
- Upset, discontinuity in the movie, also called flame
- Flash photography, often referred to as spotlight
- Wheelbar effect
- Air-gap flash
References
Source of the article : Wikipedia
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