neper
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English
Etymology
From Joannes Neper, the Latinized name of John Napier, a Scottish mathematician.
Pronunciation
- Rhymes: -eɪpə(ɹ)
Noun
neper (plural nepers)
- (electronics) A non-SI unit of the attenuation (or sometimes gain) of field and power quantities such as electronic signals; the natural logarithm of a ratio, with 1 Np (a ratio of 2.718:1) being equivalent to 8.686 dB.
- 1994, T. G. Leighton, The Acoustic Bubble, page 28:
- Values of b, the amplitude attenuation constant, are given for various materials in Table 1.1. Having dimensions of -1, it is usually measured in nepers per centimetre (Np cm-1).
- 2006, R. K. Shevgaonkar, Electromagnetic Waves, page 15:
- The unit of α is nepers per meter. It can be easily seen that if a line has an attenuation constant of 1 neper/m, a unit amplitude voltage wave will reduce to e-1 over a distance of 1 meter.
- 2008, Alan J. Fenn, Adaptive Phased Array Thermotherapy for Cancer, page 105:
- The attenuation constant for the phantom muscle tissue is αm = 10.0 nepers/m.
Related terms
Anagrams
Norwegian Bokmål
Noun
neper m or f
- indefinite plural of nepe
Norwegian Nynorsk
Noun
neper f
- indefinite plural of nepe
Romanian
Etymology
Noun
neper m (plural neperi)