[Cyborg] Aireal: Interactive Tactile Experiences in Free Air

Tomm tomm.fire at gmail.com
Tue Jul 23 14:56:51 UTC 2013

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> wrote:
>> 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
>> 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 to
>> 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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