Acoustic Absorption Calculation: Ultrasonic Sound in Water

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Discussion Overview

The discussion revolves around the calculation of acoustic absorption in water, specifically focusing on ultrasonic sound. Participants explore the relationship between frequency and attenuation, as well as the definitions and distinctions between absorption and attenuation in acoustical contexts.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires about the formula for calculating acoustic absorption in water for ultrasonic sound, indicating a lack of clarity on the topic.
  • Another participant suggests that attenuation is proportional to the square of the frequency, referencing external resources for further reading.
  • A third participant distinguishes between attenuation and absorption, noting that absorption involves the conversion of acoustical energy to heat, and expresses uncertainty regarding the existence of a standard absorption formula.
  • A later reply challenges the initial framing by stating that attenuation results from absorption and dispersion, suggesting a need for clarity in definitions.

Areas of Agreement / Disagreement

Participants express differing views on the definitions and relationships between absorption and attenuation, indicating that the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

There is mention of varying absorption coefficients at different frequencies, but no consensus on a standard formula or the precise relationship between absorption and attenuation is reached.

Haziq Zaini
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What is the formula to calculate acoustic absorption in water? particularly sound in the ultrasonic range.
 
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Hi there
welcome to PF

Haziq Zaini said:
What is the formula to calculate acoustic absorption in water? particularly sound in the ultrasonic range.

doesn't matter what frequency

attenuation is proportional to the freq 2

there's dozens of hits on google when ultrasonic sound absorption in water is typed in

http://www.bing.com/search?q=ultras...opResult&FORM=IETR02&conversationid=&pc=EUPP_

time for you to go do some reading :smile:

cheers
Dave
 
thanks dave

i understand that Attenuation is the gradual decrease/dissipation of Acoustical energy whereas Absorption is the acoustical energy being takenup by the medium; in this case, acoustical energy is converted to heat.

Like u said attenuation has a proportional relationship to the frequency. However, there is not really a standard Absorption formula or absorption coefficient.If there was I probably, haven't found it or unable to comprehend. From what i found; at different frequencies, the absorption coefficient varies. Correct me if I'm wrong.
 
Haziq Zaini said:
whereas Absorption is the acoustical energy being takenup by the medium; in this case, acoustical energy is converted to heat.

not whereas ... attenuation is the result of absorption ( and dispersion) :smile:
 

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