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Transmission loss

From Wikipedia, the free encyclopedia
Sound measurements
Characteristic
Symbols
 Sound pressure p, SPL, LPA
 Particle velocity v, SVL
 Particle displacement δ
 Sound intensity I, SIL
 Sound power P, SWL, LWA
 Sound energy W
 Sound energy density w
 Sound exposure E, SEL
 Acoustic impedance Z
 Audio frequency AF
 Transmission loss TL

Transmission loss (TL) in general describes the accumulated decrease in intensity of a waveform energy as a wave propagates outwards from a source, or as it propagates through a certain area or through a certain type of structure.

It is a terminology frequently used in radio communication, twisted pair systems (PTSN, Ethernet, etc), optics and acoustics.[1][2] Measures of TL are very important in the industry of acoustic devices such as mufflers and sonars.

Definition

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Measurement of transmission loss can be in terms of decibels.

Mathematically, transmission loss is measured in dB scale and in general it can be defined using the following formula:

TL = dB

where:

  • is the power of incident wave coming towards a defined area (or structure);
  • is the power of transmitted wave going away from the defined area (or structure).

Applications

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Transmission loss may refer to a more specific concept in one of the fields below:

Types

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References

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  1. ^ Norton, Kenneth A. (January 1953). "Transmission Loss in Radio Propagation". Proceedings of the IRE. 41 (1): 146–152. doi:10.1109/JRPROC.1953.274172. hdl:2027/mdp.39015077289554. ISSN 2162-6634. S2CID 51651739.
  2. ^ a b "The FOA Reference For Fiber Optics - Measuring Power in dB and dBm". www.thefoa.org. Retrieved 2023-04-21.
  3. ^ ISO 18405:2017 Underwater acoustics - Terminology (International Organization for Standardization, Geneva, 2017)
  4. ^ Sonali (2022-03-22). "What are the losses in Optical fiber?". Goseeko blog. Retrieved 2023-04-21.
  5. ^ "Twisted pair". qucs.sourceforge.net. Retrieved 2023-04-21.