Re: Ultrasonic range finder - BULK BUY?

[Kevin Hawkins <lists@xxxxxxxxxxxxxxxxx>]

I don't think its the Ultrasonic that I can hear but a repeated
clicking
which I think is as the carrier is pulsed ON or OFF to fire and time the
return path. 40Khz is quite a high frequency - and almost twice outside
the best human range.   What I'm guessing maybe done on more capable
systems is to insert a marker in the Ultrasonic carrier so that it can
run continually but still have a time reference, two reports now that
these units don't click so that's good.

I'm looking at the possibility of a single sensor diagonal (in the
horizontal plane) at a doorway - hopefully giving direction and
entry/exit info.

Kevin

.Michael wrote:
>
> In thoery you shouldn't as ultrasonic means above the human hearing
> zone/area. The younger you are the greater the chance of you hearing
> it as your hearing range decreases with age.
>
> Michael
>
> ----- Original Message -----
> From: Frank Mc Alinden
> To: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
> Sent: Monday, July 17, 2006 9:35 PM
> Subject: Re: [ukha_d] Ultrasonic range finder - BULK BUY?
>
> Hi Kevin
>
> Had one set up on my desk here and didnt notice any clicking sound....
>
> HTH
> Frank
>
> ----- Original Message -----
> From: "Kevin Hawkins" <lists@xxxxxxx
> <mailto:lists%40ukusa.demon.co.uk>>
> To: <ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>>
> Sent: Monday, July 17, 2006 10:47 PM
> Subject: Re: [ukha_d] Ultrasonic range finder - BULK BUY?
>
> > Does anyone know if these are likely to be 'audible' in the way
that
> you
> > can hear clicks from the usual ultrasonic distance measuring
devices.
> > This would limit some applications I might have in mind for them.
> > Maybe the clicks are only heard when in triggered mode. I suppose
Gerry
> > will know...I'll drop him an email.
> >
> > Kevin
> >
> >
> > Ian.bird@xxxxxxx <mailto:Ian.bird%40cibavision.com>
wrote:
> >>
> >> Hi all
> >>
> >> Is there any interest in a bulk buy for these ultrasonic
range finders
> >> that Frank pointed out a week ago?
> >>
> >> http://www.maxbotix.com/ <http://www.maxbotix.com/>
> <http://www.maxbotix.com/ <http://www.maxbotix.com/>>
> >>
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
>