Now you can witness the same diffraction phenomenon but when these waves reach a certain body or obstacle in their path, as shown in figure 2 below.įigure 2. In the previous figure we could clearly observe two types of diffraction of certain sound waves when passing through either a small hole or a larger one, with greater diffraction in the smaller hole. Therefore my friends we can say that when the sound waves go from one side to another generally will get certain objects on their way either large or small in relation to its wavelength, and that relationship makes the phenomenon of diffraction is small or large scale, then you can observe this phenomenon by passing the sound waves through a hole, where, vary the size of the hole to highlight the impact of diffraction as shown in Figure 1 below. This phenomenon as well as the other phenomena analyzed above (reflection, absorption, transmission) can be found in any space-time where we are, however my dear readers, when focusing on the phenomenon of diffraction we can express that when a sound wave front propagates from one side to another, the phenomenon of diffraction can develop, and this could be due to the fact that these waves surround a body or object that hinders their propagation or because they can pass through a small hole or orifice.
The phenomenon of sound diffraction originates when certain sound waves come to surround an obstacle that they get in their way, but also occurs when these waves manage to pass through a small hole, of course, it is important to note that the development of sound diffraction will depend on the relationship between the wavelength of these sound rays and the size of the obstacle or hole, the above aspects will depend on the diffraction of certain sound waves and this can take place either within an enclosure or outside it. The sound waves that reach our ears propagate in any direction, any sound when emitted from a particular source and then travel through the material or elastic medium such as air will usually find on its way with certain obstacles and they cause other intrinsic phenomena to be carried out to this propagation and among which we have already analyzed the phenomenon of reflection, absorption and transmission, and this time we will analyze in general the phenomenon of sound diffraction. Such a propagating wave is possibly the experimental evidence of the existence of surface acoustic wave on corrugated interface generated by diffraction.First of all my respectful greetings to all the academic community of #Hive.blog, we continue with expanding the knowledge related to the essential phenomenon of sound. The analysis of the direction and frequency of the diffracted waves based on the classical grating equation suggests that this diffraction is originated from a propagating wave along the corrugated surface.
This secondary diffraction can be experimentally observed in the general diffraction configuration as well as in the Bragg diffraction configuration.
In this work, we report an observation of diffracted waves whose intensity is much weaker than the major diffraction, and who are not expected to appear in the diffraction field. The major diffraction phenomenon, which can be well explained by the classical grating equation, can be easily observed and has been intensively studied. When a sound beam is incident onto a periodically corrugated surface, diffraction of the incident sound will be generated.
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