15850RE: [SeattleRobotics] Re: SRF08 beam angle
- Dec 1, 2003Is there any physical way to confine the angle further - without throwing off the results? I'd like to reject everything outside of about 7 to 10 degrees from center, 15 to 20 degree total cone.
From: dan michaels [mailto:dan@...]
Sent: Monday, December 01, 2003 3:38 PM
Subject: [SeattleRobotics] Re: SRF08 beam angle
--- In SeattleRobotics@yahoogroups.com, "Alejandro Alonso Puig"
> Hi all,
> I've got a question. Does anyone of you know by experience what is
> of detection of the sonar ranger SRF08 from Devantech?.what I'm
> I have found some information on the Internet, but I don't believe
> 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 40degrees
> of beam angle, but not SRF08.the graph
> The most interesting information I found about the beam pattern is
> taken from the manufacturer:really do
> http://www.robot-electronics.co.uk/htm/sonar_faq.htm but Devantech
> not give a clear figure for the beam width. I just see thatdepending on the
> decibels the beam is wider on narrower. My though is that thetransducer is
> used at about -18dB and therefore the cone width is about 100degrees.
> But I'm not sure I'm doing correctly or my unit is wrong in some
>Alonso, the beam width you measure will no doubt depend upon both the
> Could someone please confirm from experience the beam width?
> Thanks a lot in advance
> Alejandro Alonso Puig
size of your target, and also the distance away from the transducers.
If you use a large target up close, it will be detected over a much
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 it's
only 2 feet distance then it will be detected over almost 90 deg.
Then factor in the width of the target, and you will get a slightly
larger angle, on top of this.
- dan michaels
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