[Cyborg] Aireal: Interactive Tactile Experiences in Free Air

[Todd Anderson]

That is really cool! I've heard of vortex generators used as scent delivery
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/<http://www.disneyresearch.com/project/aireal/>
>
> It looks really cool!  Basically, vortices of air are directed at the user
> 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 limitations
> 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 fast.
>
> They claim they 3D printed most of the device.  The actuators are actually
> speakers ("whisper subwoofer").  I imagine if you have a leap motion you
> could hack together something like this...
>
> Eric
>
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