15853Re: SRF08 beam angle
- Dec 1, 2003what about some sort of tuning "pipe" that you slip over the reciever
to decrease the field of view that the receiver actually sees? sort
of like blinders for a horse...
also, different Transceivers have different characteristics. I'm not
sure you want to take on building your own but I know that there are
several that have much narrower patterns. For example, the murata MA
A1 series (75Khz) shows a significantly narrower pattern and they
claim a 7 degree directivity (if that's really a word...).
--- In SeattleRobotics@yahoogroups.com, "Karim Virani" <karim@c...>
> Is there any physical way to confine the angle further - withoutthrowing off the results? I'd like to reject everything outside of
about 7 to 10 degrees from center, 15 to 20 degree total cone.
> -----Original Message-----
> From: dan michaels [mailto:dan@o...]
> Sent: Monday, December 01, 2003 3:38 PM
> To: SeattleRobotics@yahoogroups.com
> Subject: [SeattleRobotics] Re: SRF08 beam angle
> --- In SeattleRobotics@yahoogroups.com, "Alejandro Alonso Puig"
> <alejandro.alonso@m...> wrote:
> > Hi all,
> > I've got a question. Does anyone of you know by experience what
> the anglebelieve
> > of detection of the sonar ranger SRF08 from Devantech?.
> > I have found some information on the Internet, but I don't
> what I'm40
> > reading. I found that the angle detection is of about 40 degrees,
> but in my
> > tests I find it is about 100 degrees. SRF04 seems to really have
> > of beam angle, but not SRF08.
> > The most interesting information I found about the beam pattern
> the graphDevantech
> > taken from the manufacturer:
> > http://www.robot-electronics.co.uk/htm/sonar_faq.htm but
> really dothe
> > not give a clear figure for the beam width. I just see that
> depending on the
> > decibels the beam is wider on narrower. My though is that the
> transducer is
> > used at about -18dB and therefore the cone width is about 100
> > But I'm not sure I'm doing correctly or my unit is wrong in some
> > Could someone please confirm from experience the beam width?
> > Thanks a lot in advance
> > Alejandro Alonso Puig
> > http://mundobot.com
> > alejandro.alonso@m...
> Alonso, the beam width you measure will no doubt depend upon both
> size of your target, and also the distance away from thetransducers.
> If you use a large target up close, it will be detected over a muchit's
> wider angle than if you use a small target far away.
> If you take a look at the Acroname site, they show a slightly
> different way of representing beam pattern than the diagram on the
> robot-electronics site. It shows that a target 10 feet or more
> distance will be detected over about 45 deg total angle, but if
> only 2 feet distance then it will be detected over almost 90 deg.http://docs.yahoo.com/info/terms/
> Then factor in the width of the target, and you will get a slightly
> larger angle, on top of this.
> - dan michaels
> Visit the SRS Website at http://www.seattlerobotics.org
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