Re: Ultrasonic
- From: NoSpam@xxxxxxxxxxx (Bob Masta)
- Date: Fri, 08 Apr 2005 13:10:00 GMT
On Thu, 07 Apr 2005 18:35:05 GMT, "Korben Dallas" <no@xxxxxxxx> wrote:
>> 140dB at 100 feet is as loud as a commercial airplane jet engine.
>
>
>But for ultrasonic frequencies 140dB is supposed to vanish into nothing at
>about 20 feet. Is that correct?
>
You will almost certainly need a highly focused system, with
parabolic reflectors to direct the sound. It seems unlikely
that you will have one small driver that can output the
required excursion at 25 kHz. so you will need an array
of drivers, with careful phase control to direct the beam.
The whole thing will come down to how carefully you can
get it focussed.
On the other hand, if you are looking for wide-area
coverage, this is gonna take a lot of power!
Bob Masta
dqatechATdaqartaDOTcom
D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
.
- References:
- Re: Ultrasonic
- From: Chris
- Re: Ultrasonic
- From: Korben Dallas
- Re: Ultrasonic
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