knife-edge - Definition. Was ist knife-edge
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Was (wer) ist knife-edge - definition

REFERS TO VARIOUS PHENOMENA THAT OCCUR WHEN A WAVE ENCOUNTERS AN OBSTACLE OR A SLIT
Knife-edge effect; Diffracted; Diffractive optics; Diffraction of light; Diffraction pattern; Light bend; Knife-edge diffraction; Diffraction Pattern; Diffract; Defraction; Laser Light Diffraction; Single slit diffraction; Single-slit experiment; Knife-Edge diffraction; Diffracts; Diffraction of Light; Knife-edge technique; Difraction; Edge diffraction; Single slit; Single-slit; Singleslit; Single slits; Single-slits; Single slitted; Single-slitted; Singleslitted; Single-slit diffraction; Singleslit diffraction; Single slit diffractions; Single-slit diffractions; Wedge fringe; Wedge fringes; Diffractogram; Diffractive; Diffractions; Knife edge effect; Diffractive optical element; Knife-Edge Diffraction
  • Diffraction of a red laser using a diffraction grating.
  • 2-slit (top) and 5-slit diffraction of red laser light
  • 2D Single-slit diffraction with width changing animation
  • A diffraction pattern of a 633 nm laser through a grid of 150 slits
  • The upper half of this image shows a diffraction pattern of He-Ne laser beam on an elliptic aperture. The lower half is its 2D Fourier transform approximately reconstructing the shape of the aperture.
  • Simulated diffraction spikes in hexagonal telescope mirrors
  • diffraction pattern]] of a red [[laser]] beam projected onto a plate after passing through a small circular [[aperture]] in another plate
  • [[Diffraction spikes]] are diffraction patterns caused due to non-circular [[aperture]] in camera or support struts in telescope; In normal vision, diffraction through eyelashes may produce such spikes.
  • The bright spot ([[Arago spot]]) seen in the center of the shadow of a circular obstacle is due to diffraction
  • Infinitely many points (three shown) along length ''d'' project phase contributions from the [[wavefront]], producing a continuously varying intensity ''θ'' on the registering plate.
  • thumb
  • Circular waves generated by diffraction from the narrow entrance of a flooded coastal quarry

knife-edge      
also knife edge
1.
To be on a knife-edge means to be in a situation in which nobody knows what is going to happen next, or in which one thing is just as likely to happen as another. (mainly BRIT)
The game is poised on a knife-edge. One mistake or one piece of good luck could decide it.
PHRASE: oft v-link PHR
2.
You can use knife-edge to refer to something that is very exciting or tense because you do not know what is going to happen next. (mainly BRIT)
Tonight's knife-edge vote could be uncomfortably close.
ADJ: ADJ n
knife-edge      
¦ noun
1. the cutting edge of a knife.
[as modifier] (of creases or pleats) very fine.
2. a very tense or dangerous situation.
3. a steep mountain ridge; an arete.
4. a steel wedge on which a pendulum or other device oscillates or is balanced.
Knife-edge      
·noun A piece of steel sharpened to an acute edge or angle, and resting on a smooth surface, serving as the axis of motion of a pendulum, scale beam, or other piece required to oscillate with the least possible friction.

Wikipedia

Diffraction

Diffraction is defined as the interference or bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the obstacle/aperture. The diffracting object or aperture effectively becomes a secondary source of the propagating wave. Italian scientist Francesco Maria Grimaldi coined the word diffraction and was the first to record accurate observations of the phenomenon in 1660.

In classical physics, the diffraction phenomenon is described by the Huygens–Fresnel principle that treats each point in a propagating wavefront as a collection of individual spherical wavelets. The characteristic bending pattern is most pronounced when a wave from a coherent source (such as a laser) encounters a slit/aperture that is comparable in size to its wavelength, as shown in the inserted image. This is due to the addition, or interference, of different points on the wavefront (or, equivalently, each wavelet) that travel by paths of different lengths to the registering surface. If there are multiple, closely spaced openings (e.g., a diffraction grating), a complex pattern of varying intensity can result.

These effects also occur when a light wave travels through a medium with a varying refractive index, or when a sound wave travels through a medium with varying acoustic impedance – all waves diffract, including gravitational waves, water waves, and other electromagnetic waves such as X-rays and radio waves. Furthermore, quantum mechanics also demonstrates that matter possesses wave-like properties, and hence, undergoes diffraction (which is measurable at subatomic to molecular levels).

The amount of diffraction depends on the size of the gap. Diffraction is greatest when the size of the gap is similar to the wavelength of the wave. In this case, when the waves pass through the gap they become semi-circular.

Beispiele aus Textkorpus für knife-edge
1. Drinks are called with this on a knife–edge already.
2. These could still produce knife–edge votes on the Bill.
3. Everybody must live on the knife edge of the global marketplace.
4. The government faces knife–edge votes on both issues this week.
5. "It‘s on a knife edge right now," said Michael Dicks, chief European economist at Lehman Brothers.