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Earlier telescope was the main device used to study space and celestial objects. The large diffraction limit of telescope leads to need of an interferometer. Instead of building an array of... |
Earlier telescope was the main device used to study space and celestial objects. The large diffraction limit of telescope leads to need of an interferometer. Instead of building an array of telescopes mixing the signals at the focal plane, a telescope is developed which has a diameter equal to the separation of the two telescopes. It can function over 36km as gigantic telescope. X-ray interferometry is the most improved version of the telescope.
With the development of x-ray interferometer, image of sky was totally changed. Telescope shows the view from the distance 100 times closer. Whereas, 100,000 times closer view can be observed using x-ray interferometry. X-ray interfermetry has been used to get concurrent fringes by motion of the crystal with two independent x-ray sources.
X-ray interferometry is made up of single large silicon crystal. It is around 10-30 cm in diameter and 20-60 cm in length. The three slices of the silicon are held in alignment by a base. The neutron is diffracted into two beams at the first slice. These diffracted beams again diffracted at the second slice, combining into single ray. In this way interferometer works.
The perfect grid of highly pure silicon of x-ray interferometry is used as a length scale. It can measure lengths in the mm range along with nm resolution. The dimensions of the samples are compared with the Avogadro constant (?0~0.543… nm). In scanning probe microscope such meticulous measurements holds greater importance. The low transaction velocity will slow down the further spreading of the rays. This is occurred due to limited intensity of the X-rays. While in a classic measurement, such a slow translation of the interferometer is required.
Interference in a strong diluted stream of x-ray photons occurs in a quantum-mechanical sense. In intense field of x-ray light, single photon is a wave packet follows in their temporal impact on the detector. It leads to the continuous signal; whose period has to be determined. When single photons hit the detector, the succeeding Fourier transformation of this series is determined by the frequency at which the lattice periods are passed. The path information can be reconstructed at constant velocity. This information can be obtained using classic measurement.
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