Hologram projection is also an example of diffraction and you may have seen one. So, what comes inside your mind when you hear the word ” hologram”, it’s sound cool to me and this phenomena is pretty cool. P.s:- Microscopic pits means where data on a compact disc is stored in binary format (1 or 0) inside a CD. This forms a diffraction grating on the CD mirror surface. These pits are placed in a row of the same width and at equal distance. Recorded data on CD is stored in microscopic pits of different lengths which carries information in the CD. Compact Disc (CD) also resembles the same kind of colours when viewed from different angles. Well, rainbow is formed because water droplets in the atmosphere separate white light into different colours of the rainbow. So almost all of you have seen a rainbow formation on rainy days. Many a time you may have seen diffraction in your life but the problem is we may not notice these little things which are created due to some of the most interesting phenomena of science and diffraction is one of them. Examples and applications of diffraction: Now you know about diffraction and let’s know some of the real-life examples and application of diffraction. All kind of waves such as water waves, gravitational waves and electromagnetic waves all waves in spectrum such as radio waves, x-ray, gamma rays etc.
![application of diffraction of sound waves application of diffraction of sound waves](https://image.slideserve.com/1401109/diffraction-of-sound-l.jpg)
This effect also occurs when light waves travel through a medium of different refractive index. Diffraction is tend to be used when there are many sources of wave and interference is used when only a few wave sources are considered. Now you may have heard about interference and it’s kinda same like diffraction but wait don’t get confused between both of them.ĭiffraction and interference are closely related but they both don’t have an exact meaning. According to this principle, every point on a wave behaves like a source. On this picture, the blue color corresponds to low noise levels while the red color corresponds to high noise levels.Phenomena of diffraction is described from the Huygens-Fresnel principle. As shown on the picture below, a noticeable reduction of sound pressure levels has been measured when the active noise control system is on (right picture) compared with it switched off (left picture). Similar effects can be achieved by vibrating the fuselage of the aircraft.
![application of diffraction of sound waves application of diffraction of sound waves](https://image1.slideserve.com/2356746/diffraction-of-light-l.jpg)
This technique has been applied to reduce the annoying noise inside the cabin of propeller aircraft. It is based on the fact that the pressure waveform generated by a primary source (such as an engine) can be cancelled by the pressure waveform emitted by a secondary source (loudspeakers) driven at the same frequency as the primary source, but with a phase shift of 180 degrees so that the acoustic pressures cancel each other out. By checking the responses of many subjects like this it has been possible to test how effective the system is.Īnother application of the principle of wave superposition is Active Noise Control. The subject is being played sounds from loudspeakers located around the sphere, and synthesised sounds which appear to come from other locations. The following picture shows practical working systems being tested during a series of subjective experiments in the ISVR. From these basic principles, Virtual Imaging Systems can be designed, in which one can produce the illusion for a listener of being in a “virtual” acoustic environment which is entirely different from that of the space in which the listener is actually located. We have seen that sources can be adjusted so as to control the acoustic environment created.