acoustic camera idea - Hive76 Discussion

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Date: Sun, 7 Oct 2012 10:36:37 -0400
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Subject: Re: [Hive 76 Discussion] acoustic camera idea
From: "Joshua D. Johnson" <objectsunlimi...@gmail.com>
To: hive76-discussion@googlegroups.com
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I don't know anything about the electronics in this instance but would like
to help build the mechanical bits, certainly the pinhole mic. I have 1/2"
square by 4' foam rods left over from a quadratic diffuser build if you
want them.
On Oct 7, 2012 10:23 AM, "Dave" <dgsh...@gmail.com> wrote:

> I bet the homebrew condenser mics could be made to handle ultrasonic
> without much trouble, if that's what you wanted to do. Probably wouldn't
> even have to do anything different unless you wanted it to be optimal.
>
> That's my plan to start with: set up a sound source somewhere (little
> piezo buzzer or something), put up a pinhole of the appropriate size and
> material, at the right distance from the mic. Move the mic around manually
> to different positions on a grid, and assemble a picture. I have no doubt
> whether or not it would work, it's just a matter of how well. Try holding
> up a helium balloon near your ear, the ambient room sound deadens
> dramatically, it's pretty eerie.
>
> -Dave
>
>
>
> On Sunday, October 7, 2012 9:39:47 AM UTC-4, J.Johnson wrote:
>>
>> That's fair. Dave was talking about homebuilt condenser microphones
>> though.. Sonar and ultrasound work at higher frequencies.
>>
>> Why not start with a single emitter and collector from a known distance
>> and see if you can get accurate readings then go on from there?
>> On Oct 7, 2012 9:27 AM, "Sean McBeth" <sean....@gmail.com> wrote:
>>
>>> Sound is direct enough to allow bats to navigate by it in the night.
>>> Sonar and ultrasound are types of acoustic imaging, and these days can make
>>> some very detailed pictures. So I have no doubt this can be done.
>>>
>>> The implications for 3d imaging are kind of exciting. The Xbox Kinect
>>> does it's depth sensing with infrared light, presuming that brighter pixels
>>> are closer pixels. Of course, put something that is very
>>> infrared-reflective in the scene and it breaks that assumption. With sound,
>>> it's slow enough that you could clock the amount of time it takes to bounce
>>> off of things, triangulate the bounces, and come up with a 3d picture.
>>>
>>> Let me know if you get around to working on this, would definitely like
>>> to help.
>>>
>>> On Sunday, October 7, 2012, Joshua D. Johnson wrote:
>>>
>>>> I'd like to hear Brendans take on this. From what I understand light
>>>> travels in a fairly direct line while sound doesn't.
>>>>
>>>> Maybe an ultrasonic emitter and all the collectors on a concave
>>>> surface?
>>>> On Oct 7, 2012 8:42 AM, "Kyle Yankanich" <> wrote:
>>>>
>>>>> I'm really curious as to the images this will produce. From what I
>>>>> understand, sounds scatters much more than light. It influences the air of
>>>>> the room, mixing and creating some chaos in the airflow. Focusing.an image
>>>>> of that would be.... Difficult. Akin to taking a regular photograph, but in
>>>>> a foggy room. Except also the fog interacts with itself. I'd also be
>>>>> curious as to how the "focusing" effect would change. It normal
>>>>> photography, as the lens is moved from the photo sensitive material, it
>>>>> changes the distance of focus. Sometimes, since lights different colors are
>>>>> different wavelengths, you get different colors focusing.differently. its
>>>>> called.chromatic.aberation. Since sounds wavelengths are so much larger,
>>>>> does that mean we'll be effectively tuning out whole parts of the audio
>>>>> wavelengths?
>>>>>
>>>>> --
>>>>> To post to this group, send email to hive76-discussion@**
>>>>> googlegroups.com
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>>>>>
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>>>
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>>
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<p>I don&#39;t know anything about the electronics in this instance but wou=
ld like to help build the mechanical bits, certainly the pinhole mic. I hav=
e 1/2&quot; square by 4&#39; foam rods left over from a quadratic diffuser =
build if you want them.</p>

<div class=3D"gmail_quote">On Oct 7, 2012 10:23 AM, &quot;Dave&quot; &lt;<a=
 href=3D"mailto:dgsh...@gmail.com">dgsh...@gmail.com</a>&gt; wrote:<br type=
=3D"attribution"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex">
I bet the homebrew condenser mics could be made to handle ultrasonic withou=
t much trouble, if that&#39;s what you wanted to do. Probably wouldn&#39;t =
even have to do anything different unless you wanted it to be optimal.<div>
<br></div><div>That&#39;s my plan to start with: set up a sound source some=
where (little piezo buzzer or something), put up a pinhole of the appropria=
te size and material, at the right distance from the mic. Move the mic arou=
nd manually to different positions on a grid, and assemble a picture. I hav=
e no doubt whether or not it would work, it&#39;s just a matter of how well=
. Try holding up a helium balloon near your ear, the ambient room sound dea=
dens dramatically, it&#39;s pretty eerie.</div>
<div><br></div><div>-Dave</div><div><br></div><div><br><br>On Sunday, Octob=
er 7, 2012 9:39:47 AM UTC-4, J.Johnson wrote:<blockquote class=3D"gmail_quo=
te" style=3D"margin:0;margin-left:0.8ex;border-left:1px #ccc solid;padding-=
left:1ex">
<p>That&#39;s fair. Dave was talking about homebuilt condenser microphones =
though.. Sonar and ultrasound work at higher frequencies. </p>
<p>Why not start with a single emitter and collector from a known distance =
and see if you can get accurate readings then go on from there? </p>
<div class=3D"gmail_quote">On Oct 7, 2012 9:27 AM, &quot;Sean McBeth&quot; =
&lt;<a>sean....@gmail.com</a>&gt; wrote:<br type=3D"attribution"><blockquot=
e class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc sol=
id;padding-left:1ex">

Sound is direct enough to allow bats to navigate by it in the night. Sonar =
and ultrasound are types of acoustic imaging, and these days can make some =
very detailed pictures. So I have no doubt this can be done.<div><br></div>


<div>The implications for 3d imaging are kind of exciting. The Xbox Kinect =
does it&#39;s depth sensing with infrared light, presuming that brighter pi=
xels are closer pixels. Of course, put something that is very infrared-refl=
ective in the scene and it breaks that assumption. With sound, it&#39;s slo=
w enough that you could clock the amount of time it takes to bounce off of =
things, triangulate the bounces, and come up with a 3d picture.</div>


<div><br></div><div>Let me know if you get around to working on this, would=
 definitely like to help.<span></span><br><br>On Sunday, October 7, 2012, J=
oshua D. Johnson  wrote:<br><blockquote class=3D"gmail_quote" style=3D"marg=
in:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">


<p>I&#39;d like to hear Brendans take on this. From what I understand light=
 travels in a fairly direct line while sound doesn&#39;t. </p>
<p>Maybe an ultrasonic emitter and all the collectors on a concave surface?=
 </p>
<div class=3D"gmail_quote">On Oct 7, 2012 8:42 AM, &quot;Kyle Yankanich&quo=
t; &lt;&gt; wrote:<br type=3D"attribution">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
I&#39;m really curious as to the images this will produce. From what I unde=
rstand, sounds scatters much more than light. It influences the air of the =
room, mixing and creating some chaos in the airflow. Focusing.an image of t=
hat would be.... Difficult. Akin to taking a regular photograph, but in a f=
oggy room. Except also the fog interacts with itself. I&#39;d also be curio=
us as to how the &quot;focusing&quot; effect would change. It normal photog=
raphy, as the lens is moved from the photo sensitive material, it changes t=
he distance of focus. Sometimes, since lights different colors are differen=
t wavelengths, you get different colors focusing.differently. its called.ch=
romatic.aberation. Since sounds wavelengths are so much larger, does that m=
ean we&#39;ll be effectively tuning out whole parts of the audio wavelength=
s?<br>




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</blockquote></div>

<p></p>

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<p></p>

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</blockquote></div>

<p></p>

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