Wednesday, November 9, 2011

A custom acoustic doppler velocimeter?

This recent Sailing Anarchy entry about acoustic doppler velocimetry really got my attention, and I am thinking about developing a custom prototype.

My current understanding is that with this technology, you can measure the flow velocity at a certain distance of the transducer, beyond the near field described in this figure.




The length Z of the near field depends on the diameter D of the emitter, and on the wavelength λ of the signal. The wavelength λ is related to the frequency f of the signal and on the speed of sound c in the water (around 1500 m/s).

 

For example, a 25 mm emitter operating at 3 MHz would yield a near field of 0.31 m (12 in). This example is not totally arbitrary because, as an element of motivation, I have already ordered a pair of piezoelectric transducers with these exact characteristics from this source.



I will now try to identify what kind of electronics and software will be needed to eventually get a working unit.

4 comments:

  1. Great blog! I really love how it is easy on my eyes and the information are well written. I am wondering how I might be notified whenever a new post has been made.
    Paddle Wheel Flow Meter

    ReplyDelete
  2. Thanks, You wrote awesome, I have learn lots of things from your article. It's really helpful for any readers.
    Battery Operated Flow Meter

    ReplyDelete
  3. Thanks for posting the useful information.
    Manasmicro.com is best magnetic flow supplier in all over India. It is the best magnetic flow meter manufacturers company in pune India.
    magnetic flow meter - Manasmicro

    ReplyDelete
  4. Thanks for posting the useful information.
    Manasmeter supply flow meter at affordable price. We sale best gas flow meter, digital gas flow meter, and steam flow meter at cheap cost.
    gas flow meter - Manasmicro
    digital gas flow meter – Manasmicro

    ReplyDelete