Diffraction-pattern sentence example
If the aperture be increased, not only is the total brightness over the focal plane increased with it, but there is also a concentration of the diffraction pattern.
The contraction of the diffraction pattern with increase of aperture is of fundamental importance in connexion with the resolving power of optical instruments.
According to common optics, where images are absolute, the diffraction pattern is supposed to be infinitely small, and two radiant points, however near together, form separated images.
If the image of the line be =o, the intensity at any point E, n of the diffraction pattern may be represented by ?2a2t2 S A2f2 the same law as obtains for a luminous point when horizontal directions are alone considered.
By this procedure the width of the central band in the diffraction pattern is halved, and so far an advantage is attained.Advertisement
In these expressions we are to replace p by ks/f, or rather, since the diffraction pattern is symmetrical, by kr/f, where r is the distance of any point in the focal plane from the centre of the system.
The first dark ring in the diffraction pattern of the complete circular aperture occurs when r/f = 1.2197 XO /2R (15).
The diffraction pattern is therefore that due to a single aperture, merely brightened n times.
In observing the bands he received them at first upon a screen of finely ground glass, upon which a magnifying lens was focused; but it soon appeared that the ground glass could be dispensed with, the diffraction pattern being viewed in the same way as the image formed by the object-glass of a telescope is viewed through the eye-piece.
With fairly homogeneous light the diffraction pattern may be observed at a distance, varying with the width of the slit from about the length of the collimator to one quarter of that length.Advertisement
This window shows a simulated TEM diffraction pattern for the wurtzite structure, colour-coded to show the phase of diffracted intensity.
What else can we say about the diffraction pattern from a protein crystal?
The linear dimension of the diffraction pattern is inversely as that of the aperture, and the brightness at corresponding points is as the square of the area of aperture.
Sophisticated mathematical techniques are then used to analyze the diffraction pattern.