A new device for underwater hearing

[tursiops]

My sympathies!

I just had a quick email exchange with the Science writer; she said: "The physics principles are the same whether one is going from air to water or vice versa -- these results hold true both ways. I've attached the original research article, which states that "Consider the case of air-to-water acoustic transmission. The acoustic wave equation obeys the principle of reciprocity, and so yields the same reflection and transmission coefficients as the water-to air case." "
i don't agree; yes, the equation goes both ways, but the reflection coefficients from a rough sea surface are not the same in air and in water because the sound wavelengths are different for the same frequency sound.

 

[dmaziuk]

Because the physics principles of flight are the same when applied to automobiles, we can have flying cars. Any day now.

 

[rabe]

You STILL do not understand the article. It does NOT help you hear sounds made underwater.

Breath...

 

[tursiops]

Breath...

Think...

 

[TMHeimer]

would still have to be pretty bloody loud to be heard over any distance. If you want diver recall, get one of the transmitters that you can built for about $50 and drop it over the edge....

That's what I was thinking. If the objective is for people above and underwater to hear each other does it work at 100' apart? 3 feet?
MY tongue and cheek reply would be--would it help me hear what those actors on TV are mumbling about without my wife having to turn up the volume--ah, too much Band teaching and age I guess.

 

[rabe]

Think...

Breath harder...