Such effects are normally quite weak, except in a regime where the effective reflection anyway becomes very weak. Note also that the influence of beam divergence and polarization on the Fresnel reflection is ignored in the calculations. ![]() ![]() get 99.9% coupling displayed where theoretically it should be 100%. Note that there is a trade-off between numerical accuracy and computational speed. Note that the software needs to consider a very large number of pairs of modes in such cases. If there are dozens or even hundreds of modes, however, the calculations can take a substantial computation time. Speed and Numerical Accuracyįor fibers with only a couple of guided modes, the calculations are fairly quick they can usually be done within a few seconds. You will find that value below the table of coupled powers if you do not specify input and output modes. In that case, the total reflectivity can be approximated by the average reflectivity of all modes. In some cases, you may assume that you have an approximately uniform distribution of power over the modes. ![]() If the fiber is a multimode fiber, that will depend on how the power in that fiber is distributed over the modes, since the reflection losses can be strongly mode-dependent. You may want to know how much power overall is reflected into guided modes of the fiber. If you have arbitrary input or output modes, all possible orientations are taken into account.For example, if your input mode is LP_, only the orientation is considered. If you have a specific input or output mode, only the specified orientation is taken into account.The software handles orientations as follows: You can get the latter by specifying a negative value. Modes with can have two different orientations: one with a dependence and one with a dependence. That gives the effective reflectivity if all input fiber modes carry the same optical power. Also, the average reflectivity is displayed. If no specific input and reflected modes are specified, you obtain for each input mode the total power reflected into guided modes of the fiber.If you enter only an output mode, you obtain the coupling of all input modes to that mode.If you enter only an input mode, you obtain the coupling of that mode to all modes.Also, you obtain the total power coupled to all other guided modes. If you enter a specific input and reflected mode, you obtain the coupling only for that pair of modes.The calculated quantities depend on whether or not you enter specific input or output modes: Note that different orientations can be specified – see below. You may or may not define specific modes of the input and reflected light via their and indices.reflection of Austrias high score on the. Set the cut angle, i.e., the angular deviation of the fiber end from a perpendicular cut. Argentina scores 56 on this dimension, reflecting the presence of slightly more Masculine than Feminine elements.(Its index profile is defined in the “Index profile” tab.) This functionality is available only in the PRO version. This is not trivial to calculate, since in multimode fibers you can get a coupling between different modes. In this tab you can calculate how light is reflected at a fiber end, which may be angled. It’s recommended to agree each definite type of acoustic treating with acoustic engineer.Here we explain in detail how the RP Fiber Calculator software is used.Įach of the menu items explains one of the tabs. Line sizes of applied acoustic treating should be 500-600 mm bigger than areas of first reflections. Acoustic treatment for areas of first reflections must be suitable for frequency range, where acoustic distortions are observed the most often. ![]() Due to each definite case, it’s recommended to place sound-absorbing or sound-dispersing constructions at places with areas of first reflections. Furthermore, reflections off rear wall can affect sound quality if the listening zone is situated too close.ĥ. The most important are those early reflections off the sidewalls and the ceiling between the listening zone and AS. Manipulating the intensity of early reflections allows to improve the quality of sound stage, and make AS sounding more detailed and vivid.Ĥ. The program will automatically calculate location of areas of first reflections in corresponding diagrams on the right.ģ. Insert all necessary parameters into corresponding areas in diagrams on the leftĢ.
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