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A stroboscope , also known as a strobe, is an instrument used to make a cyclically moving object appear to be slow-moving or stationary. The principle is used for the study of rotating , reciprocating or vibrating objects. Machine parts and vibrating strings are common examples. Rotation of a plane, seen as the rotation of the terrain relative to the plane (exposure time 1. ...
In mathematics, the reciprocal, or multiplicative inverse, of a number x is the number which, when multiplied by x, yields 1. ...
See Oscillator (disambiguation) for particular types of oscillation and oscillators. ...
In its simplest form, a rotating disc with evenly-spaced holes is placed in the line of sight between the observer and the moving object. The rotational speed of the disc is adjusted so that it becomes synchronised with the movement of the observed system, which seems to slow and stop. The illusion is caused by temporal aliasing, commonly known as the 'stroboscopic effect'. Temporal aliasing is the technical term for a phenomenon also known as the stroboscopic effect or the wagon-wheel effect. ...
In electronic versions, the perforated disc is replaced by a lamp capable of emitting brief and rapid flashes of light. The frequency of the flash is adjusted so that it is a unit fraction of the object's cyclic speed, at which point the object is seen to be stationary. The field of electronics is the study and use of systems that operate by controlling the flow of electrons (or other charge carriers) in devices such as thermionic valves and semiconductors. ...
An animation illustrating the effect of strobe light A strobe light or stroboscopic lamp, commonly called a strobe, is a device used to produce regular flashes of light. ...
Sine waves of various frequencies; the lower waves have higher frequencies than those above. ...
A unit fraction is a rational number written as a fraction where the numerator is one and the denominator is a positive integer. ...
History
Joseph Plateau of Belgium is generally credited with the invention the stroboscope in 1832, when he used a disc with radial slits which he turned while viewing images on a separate rotating wheel. Plateau called his device the 'Phenakistoscope'. There was a simultaneous and independent invention of the device by the Austrian Simon von Stampfer, which he named the 'Stroboscope', and it is his term which is used today. The etymology is from the Greek words strobo(s), meaning 'whirling' and scope meaning 'to look at'. Plateaus phenakistiscope Joseph Antoine Ferdinand Plateau (October 14, 1801 - September 15, 1883) was a Belgian physicist. ...
1832 was a leap year starting on Sunday (see link for calendar). ...
The phenakistoscope (also spelled phenakistiscope) was an early animation device, the predecessor to the zoetrope. ...
As well as having important applications for scientific research, the earliest inventions received immediate popular success as methods for producing moving pictures, and the principle was used for numerous toys. Film refers to the celluloid media on which movies are printed. ...
Other early pioneers employed rotating or vibrating mirrors. The electronic strobe light stroboscope was invented in 1931, when Harold Eugene Edgerton employed a flashing lamp to study machine parts in motion. An animation illustrating the effect of strobe light A strobe light or stroboscopic lamp, commonly called a strobe, is a device used to produce regular flashes of light. ...
1931 (MCMXXXI) was a common year starting on Thursday (link is to a full 1931 calendar). ...
Shadowgraph of a . ...
Edgerton later used very short flashes of light as a means of producing still photographs of fast-moving objects, such as bullets in flight. Photography is the process of making pictures by means of the action of light. ...
Applications Stroboscopes play an important role in the study of stresses on machinery in motion, and in many other forms of research. They are also used as measuring instruments for determining cyclic speed.
As a timing light they are used to set the ignition timing of internal combustion engines. A timing light is a stroboscope used to dynamically set the ignition timing of an Otto cycle or similar internal combustion engine. ...
The ignition system of an internal-combustion engine is an important part of the overall engine system that provides for the timely burning of the fuel mixture within the engine. ...
Timing refers to how events are spaced in time. ...
A colorized automobile engine The internal combustion engine is a heat engine in which the burning of a fuel occurs in a confined space called a combustion chamber. ...
In medicine, stroboscopes are used to view the vocal cords for diagnosis. The patient hums or speaks into a microphone which in turn activates the stroboscope at either the same or a slightly different frequency. The light source and a camera are positioned by endoscopy. Laryngoscopic view of the vocal folds. ...
A microphone, sometimes referred to as a mike or mic (pronounced mike), is an acoustic to electric transducer that converts sound into an electrical signal. ...
Endoscopy means looking inside and refers to looking inside the human body for medical reasons. ...
Another application of the stroboscope can be seen on many gramophone turntables. The edge of the platter has marks at specific intervals so that when viewed by incandescent light powered at mains frequency, and provided the platter is rotating at the correct speed, the marks appear to be stationary. Edison cylinder phonograph from about 1899 The phonograph, or gramophone, was the most common device for playing recorded sound from the 1870s through the 1980s. ...
An incandescent light bulb and its glowing filament. ...
The utility frequency (American English) or mains frequency (British English) is the frequency at which alternating current (AC) is transmitted from a power plant to the end user. ...
Flashing lamp strobes are also adapted for popular use, as a lighting effect for discotheques and night clubs where they give the impression of dancing in slow motion. An animation illustrating the effect of strobe light A strobe light or stroboscopic lamp, commonly called a strobe, is a device used to produce regular flashes of light. ...
Discothèque redirects here. ...
A nightclub (often dance club or club, particularly in the UK) is an entertainment venue which does its primary business after dark. ...
Other effects Rapid flashing can give the illusion that white light is tinged with colour, known as Fechner colour. Within certain ranges, the apparent colour can be controlled by the frequency of the flash, but it is an illusion generated in the mind of the observer and not a real colour. The Benham's top demonstrates the effect. Fechner color is an illusion of color seen when looking at certain rapidly changing or moving black-and-white patterns. ...
Benhams top, also called Benhams disk, is named after the English toymaker Charles Benham, who, in 1895, sold a top painted with the pattern shown. ...
At certain frequencies, flashing light can trigger epileptic seizures in some people. This article or section does not cite its references or sources. ...
See also The Praxinoscope was an animation device, the successor to the zoetrope. ...
An animation illustrating the effect of strobe light A strobe light or stroboscopic lamp, commonly called a strobe, is a device used to produce regular flashes of light. ...
A tachometer is a device used for measuring the speed of a moving body or substance (from Greek: tachos = speed, metron = measure). ...
A thaumatrope is a toy that was popular in Victorian times. ...
A modern replica of a Victorian zoetrope. ...
External links - Demonstration of Phenakistoscope and Stroboscope at North Carolina School of Science and Mathematics
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