[Cyborg] Aireal: Interactive Tactile Experiences in Free Air
todicus at gmail.com
Tue Jul 23 19:32:38 UTC 2013
That's awesome. Did you try / is it safe to put your face at the nodal
point? We need to build one in SF!
On Tue, Jul 23, 2013 at 10:56 AM, Tomm <tomm.fire at gmail.com> wrote:
> 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.
> Quoting Todd Anderson <todicus at gmail.com>:
> > That is really cool! I've heard of vortex generators used as scent
> > devices, and even tried to make one with an old camera aperture and a
> > speaker. The speaker didn't have enough displacement, I think, so just
> > covering the open end of a tin can with stretchy material, and making a
> > small hole on the opposite side, gave better results (though required a
> > finger tap).
> > As for latency, they say ~140 msec at a distance of 1 meter. Good not
> > great. Here is a chart of vortex speed vs distance traveled:
> > [image: Inline image 1]
> > The phased array ultrasound mentioned in the intro sounds pretty awesome;
> > has anyone experienced something like this?
> > "In ultrasound-based acoustic radiation fields [Iwamoto et al.
> > 2008; Suzuki et al. 2010; Jason et al. 2011], a two-dimensional
> > array of 324 ultrasonic transducers operating at 40kHz form a
> > beam of ultrasound using a phased array focusing technique.
> > Because of the low ultrasound frequency, 99.9% of incident acoustic
> > energy will reflect from the human skin creating a pressure field
> > which provides perceivable tactile sensations. By modulating the
> > ultrasound beam at ~200 Hz, the perceived intensity of tactile
> > sensations increases due to the high sensitivity of skin to vibratory
> > stimuli at this frequency [Sherrick 1991]. A phased array technique
> > is used to control the focal point of the ultrasound beam
> > [Suzuki et al. 2010]."
> > On Sun, Jul 21, 2013 at 10:47 AM, Eric Boyd <mrericboyd at yahoo.com>
> >> http://www.disneyresearch.com/**project/aireal/<
> >> It looks really cool! Basically, vortices of air are directed at the
> >> as they interact with a motion detection system (like Kinect or Leap
> >> Motion), and the air pressure changes are the haptic feedback. I'd
> love to
> >> know how it actually feels. It looks to me like one of the big
> >> is gonna be the lag time - it's gonna take a noticeable amount of time
> >> generate and propagate the air to the user, so feedback can't be super
> >> They claim they 3D printed most of the device. The actuators are
> >> speakers ("whisper subwoofer"). I imagine if you have a leap motion you
> >> could hack together something like this...
> >> Eric
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