<div dir="ltr">That's awesome. Did you try / is it safe to put your face at the nodal point? We need to build one in SF!</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jul 23, 2013 at 10:56 AM, Tomm <span dir="ltr"><<a href="mailto:tomm.fire@gmail.com" target="_blank">tomm.fire@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I got to feel a phased array ultrasound system this past weekend at the Republika conference in Croatia. Felt about the same as blowing about as hard as I can at a distance of about 18" - quite strong! But also focused so that it was noticeably different between the center of my hand, and the edge of my hand.<div class="im">
<br>
<br>Quoting Todd Anderson <<a href="mailto:todicus@gmail.com" target="_blank">todicus@gmail.com</a>>:<br><br>> That is really cool! I've heard of vortex generators used as scent delivery<br>> devices, and even tried to make one with an old camera aperture and a<br>
> speaker. The speaker didn't have enough displacement, I think, so just<br>> covering the open end of a tin can with stretchy material, and making a<br>> small hole on the opposite side, gave better results (though required a<br>
> finger tap).<br>><br>> As for latency, they say ~140 msec at a distance of 1 meter. Good not<br>> great. Here is a chart of vortex speed vs distance traveled:<br>><br></div>> [image: Inline image 1]<div class="im">
<br>><br>
><br>> The phased array ultrasound mentioned in the intro sounds pretty awesome;<br>> has anyone experienced something like this?<br>><br>> "In ultrasound-based acoustic radiation fields [Iwamoto et al.<br>
> 2008; Suzuki et al. 2010; Jason et al. 2011], a two-dimensional<br>> array of 324 ultrasonic transducers operating at 40kHz form a<br>> beam of ultrasound using a phased array focusing technique.<br>> Because of the low ultrasound frequency, 99.9% of incident acoustic<br>
> energy will reflect from the human skin creating a pressure field<br>> which provides perceivable tactile sensations. By modulating the<br>> ultrasound beam at ~200 Hz, the perceived intensity of tactile<br>> sensations increases due to the high sensitivity of skin to vibratory<br>
> stimuli at this frequency [Sherrick 1991]. A phased array technique<br>> is used to control the focal point of the ultrasound beam<br>> [Suzuki et al. 2010]."<br>><br>><br>> On Sun, Jul 21, 2013 at 10:47 AM, Eric Boyd <<a href="mailto:mrericboyd@yahoo.com" target="_blank">mrericboyd@yahoo.com</a>> wrote:<br>
><br></div>>> <a href="http://www.disneyresearch.com/**project/aireal/" target="_blank">http://www.disneyresearch.com/**project/aireal/</a><<a href="http://www.disneyresearch.com/project/aireal/" target="_blank">http://www.disneyresearch.com/project/aireal/</a>><div class="im">
<br>
>><br>>> It looks really cool! Basically, vortices of air are directed at the user<br>>> as they interact with a motion detection system (like Kinect or Leap<br>>> Motion), and the air pressure changes are the haptic feedback. I'd love to<br>
>> know how it actually feels. It looks to me like one of the big limitations<br>>> is gonna be the lag time - it's gonna take a noticeable amount of time to<br>>> generate and propagate the air to the user, so feedback can't be super fast.<br>
>><br>>> They claim they 3D printed most of the device. The actuators are actually<br>>> speakers ("whisper subwoofer"). I imagine if you have a leap motion you<br>>> could hack together something like this...<br>
>><br>>> Eric<br>>><br></div>>> ______________________________**_________________<br>>> Cyborg mailing list<br>>> <a href="mailto:Cyborg@lists.noisebridge.net" target="_blank">Cyborg@lists.noisebridge.net</a><br>
>> <a href="https://www.noisebridge.net/**mailman/listinfo/cyborg" target="_blank">https://www.noisebridge.net/**mailman/listinfo/cyborg</a><<a href="https://www.noisebridge.net/mailman/listinfo/cyborg" target="_blank">https://www.noisebridge.net/mailman/listinfo/cyborg</a>><br>
>><br>><br>><span class="HOEnZb"><font color="#888888"><br>><br>> --<br>> <a href="http://www.octotod.net" target="_blank">http://www.octotod.net</a><br>><br><br><br></font></span></div>
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