IEVref: | 802-01-20 | ID: | |

Language: | en | Status: Standard | |

Term: | beamwidth, <in ultrasonics> | ||

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Symbol: | w
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Definition: | greatest distance between two points on a specified axis perpendicular to the beam axis, where the pulse-pressure-squared integral falls below its maximum on the specified axis by a specified amount
Note 1 to entry: Commonly used beamwidths are specified at −6 dB ( Note 2 to entry: The term "beamwidth" has different meanings in optical fibre communication (see IEV 731-01-35) and in relation to antennae (see IEV 712-02-33).
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Publication date: | 2021-04 | ||

Source | |||

Replaces: | 802-01-20:2011-01 | ||

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CO remarks: | |||

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VT remarks: | |||

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Note 1 to entry: Commonly used beamwidths are specified at −6 dB (*w*_{6}), −10 dB (*w*_{10}) and −20 dB (*w*_{20}) levels below the maximum. The decibel calculation implies taking 10 times the logarithm (to the base 10) of the ratios of the integrals.

Note 2 to entry: The term "beamwidth" has different meanings in optical fibre communication (see IEV 731-01-35) and in relation to antennae (see IEV 712-02-33).