IEVref: | 801-32-63 | ID: | |

Language: | en | Status: Standard | |

Term: | propagation loss, <in underwater acoustics> | ||

Synonym1: | PL | ||

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Symbol: | N_{PL}
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Definition: | product of minus ten decibels and the base 10 logarithm of the squared magnitude of the transfer function from ${x}_{0}$ to $x$ Note 1 to entry: In equation form: ${N}_{\text{PL}}=-\text{10lg}\left({\left|H\left(f\right)\right|}^{\text{2}}/{d}_{\text{0}}\right)\text{dB}$, where $H\left(f\right)$ is the transfer function from source position ${x}_{0}$ to receiver position $x$. The transfer function, $H\left(f\right)$, has dimensions of inverse distance (the value of reference distance ${d}_{0}$ in the denominator of the logarithm argument in the equation is 1 m Note 2 to entry: Propagation loss is defined for an equivalent monopole point source (where the source is treated as a point source of sound). Note 3 to entry: This definition of propagation loss is consistent with that of ISO 18405, which is more generally applicable and valid for a finite source. Note 4 to entry: The reference value for propagation loss is 1 m Note 5 to entry: This note applies to the French language only. | ||

Publication date: | 2021-02 | ||

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Note 1 to entry: In equation form: ${N}_{\text{PL}}=-\text{10lg}\left({\left|H\left(f\right)\right|}^{\text{2}}/{d}_{\text{0}}\right)\text{dB}$, where $H\left(f\right)$ is the transfer function from source position ${x}_{0}$ to receiver position $x$. The transfer function, $H\left(f\right)$, has dimensions of inverse distance (the value of reference distance ${d}_{0}$ in the denominator of the logarithm argument in the equation is 1 m^{2}).

Note 2 to entry: Propagation loss is defined for an equivalent monopole point source (where the source is treated as a point source of sound).

Note 3 to entry: This definition of propagation loss is consistent with that of ISO 18405, which is more generally applicable and valid for a finite source.

Note 4 to entry: The reference value for propagation loss is 1 m^{2}.

Note 5 to entry: This note applies to the French language only.