“reflection coefficient”的概念、定义、翻译、参考文献-科学参考

reflection coefficient

Electronics and Electrical Engineering

The vector ratio of the return current, I_R, to the incident current, I₀, when a transmission line is incorrectly terminated with an impedance, Z_R, not equal to the characteristic impedance, Z₀, of the line. The incident current is that current flowing in the line at termination when Z_R is made equal to Z₀; the return current is the portion of the current flowing back along the line due to incorrect matching. The actual current in the line at termination is the vector sum of I_R and I₀. In this case the reflection coefficient may be expressed in terms of the impedances Z₀ and Z_R, i.e. the reflection coefficient can be given by
$\frac{(Z_{0} - Z_{R})}{(Z_{0} + Z_{R})}$
Compare reflection factor.

Geology and Earth Sciences

1. (R) The ratio of the amplitude of a reflected ray (A₁) to that of the incoming ray (A₀), such that R = A₁A₀. In the case of a normally incident ray, R can be expressed in terms of the acoustic impedances of the two media above and below the reflector, Z₁ and Z₂, so that R = (Z₂ – Z₁)/(Z₂ + Z₁). The range of values for R lie between −1 and +1. If R is negative a phase reversal (π‎) in the wave occurs at the reflector. For water/air R has a typical value of −1; for rocks R has an average value of 0.2 or less. See also transmission coefficient. The reflection coefficient can also be expressed in terms of energy (R′‎), when R′‎ = R².
2. (k) A ratio of true resistivities, such that k = (ρ‎₂ – ρ‎₁)/(ρ‎₂ + ρ‎₁), where ρ‎₁ and ρ‎₂ are the true resistivities above and below an interface.

单词	reflection coefficient
释义	reflection coefficient Electronics and Electrical Engineering The vector ratio of the return current, I_R, to the incident current, I₀, when a transmission line is incorrectly terminated with an impedance, Z_R, not equal to the characteristic impedance, Z₀, of the line. The incident current is that current flowing in the line at termination when Z_R is made equal to Z₀; the return current is the portion of the current flowing back along the line due to incorrect matching. The actual current in the line at termination is the vector sum of I_R and I₀. In this case the reflection coefficient may be expressed in terms of the impedances Z₀ and Z_R, i.e. the reflection coefficient can be given by $\frac{(Z_{0} - Z_{R})}{(Z_{0} + Z_{R})}$ Compare reflection factor. Geology and Earth Sciences 1. (R) The ratio of the amplitude of a reflected ray (A₁) to that of the incoming ray (A₀), such that R = A₁A₀. In the case of a normally incident ray, R can be expressed in terms of the acoustic impedances of the two media above and below the reflector, Z₁ and Z₂, so that R = (Z₂ – Z₁)/(Z₂ + Z₁). The range of values for R lie between −1 and +1. If R is negative a phase reversal (π‎) in the wave occurs at the reflector. For water/air R has a typical value of −1; for rocks R has an average value of 0.2 or less. See also transmission coefficient. The reflection coefficient can also be expressed in terms of energy (R′‎), when R′‎ = R². 2. (k) A ratio of true resistivities, such that k = (ρ‎₂ – ρ‎₁)/(ρ‎₂ + ρ‎₁), where ρ‎₁ and ρ‎₂ are the true resistivities above and below an interface.
随便看	four-point probe four Russians algorithm four squares theorem Fourteen Points (8 January 1918) Fourteenth Amendment (1868) four-term fallacy four-terminal network four-terminal resistor fourth contact fourth dimension fourth-generation language fourth generation((of computers)) fourth-generation Web site fourth root of unity four-wave mixing four-wire circuit four zero four compliant fovea Fowler, Alfred Fowler, William Alfred Fowler, William Alfred (1911–95) fox Fox, Charles James (1749–1806) Fox, George (1624–91) Fox, Harold Munro