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Groups > sci.electronics.design > #460102
| From | Terry Newton <nbill@bellsouth.net> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Microphone risk factors |
| Date | 2017-05-13 17:19 +0000 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <of7f7b$p5o$1@gioia.aioe.org> (permalink) |
| References | <of4o66$dcl$1@dont-email.me> <mbhL8BP0acdfEJUhnospam@invalid.com> <of4t4l$7ce$1@dont-email.me> |
On Fri, 12 May 2017 11:02:27 -0700, Don Y wrote:
> For example, when tablets are manufactured (by compressing "powdered
> granulation"), a common problem is air becoming entrapped in the
> "powder" as it is compressed. When the pressure is released, the
> compressed air causes the tablet to "explode" (the top pops off).
>
> This could be sensed audibly by locating a microphone adjacent to the
> tablets' path of motion and listening to the sound that accompanies the
> release of the compressive force (heavy filtering but you *know*
> what the fundamental frequency of the signal is, a priori).
>
> But, it would be an impractical environment as the inevitable
> accumulation of the powdered "granulation" would quickly render the
> microphone ("acoustical transducer") useless.
>
> You'd never encounter this problem in a more traditional microphone
> application! :>
Separate the sensor and electronics. Sensor can be a robust piece of
metal foil etc. Or even the material itself. Bounce a laser beam off
of it to a photocell and "listen" for characteristic "sounds".
Such a solution would be very inexpensive compared to traditional
microphone technology and far less subject to the environment.
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Microphone risk factors Don Y <blockedofcourse@foo.invalid> - 2017-05-10 21:27 -0700
Re: Microphone risk factors Phil Allison <pallison49@gmail.com> - 2017-05-10 21:39 -0700
Re: Microphone risk factors jrwalliker@gmail.com - 2017-05-11 07:01 -0700
Re: Microphone risk factors Don Y <blockedofcourse@foo.invalid> - 2017-05-11 11:06 -0700
Re: Microphone risk factors piglet <erichpwagner@hotmail.com> - 2017-05-12 09:02 +0100
Re: Microphone risk factors "Michael Kellett" <nospam@invalid.com> - 2017-05-12 16:02 +0100
Re: Microphone risk factors Don Y <blockedofcourse@foo.invalid> - 2017-05-12 09:37 -0700
Re: Microphone risk factors "Michael Kellett" <nospam@invalid.com> - 2017-05-12 18:08 +0100
Re: Microphone risk factors Don Y <blockedofcourse@foo.invalid> - 2017-05-12 11:02 -0700
Re: Microphone risk factors Phil Allison <pallison49@gmail.com> - 2017-05-12 17:44 -0700
Re: Microphone risk factors Terry Newton <nbill@bellsouth.net> - 2017-05-13 17:19 +0000
Re: Microphone risk factors Don Y <blockedofcourse@foo.invalid> - 2017-05-13 11:57 -0700
Re: Microphone risk factors Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-13 19:12 +0000
Re: Microphone risk factors Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-14 08:40 +0000
Re: Microphone risk factors Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-14 09:17 +0000
Re: Microphone risk factors Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-14 10:49 +0000
Re: Microphone risk factors Terry Newton <nbill@bellsouth.net> - 2017-05-13 19:26 +0000
Re: Microphone risk factors (OT -- long) Don Y <blockedofcourse@foo.invalid> - 2017-05-13 13:37 -0700
Re: Microphone risk factors "dcaster@krl.org" <dcaster@krl.org> - 2017-05-13 11:06 -0700
Re: Microphone risk factors Don Y <blockedofcourse@foo.invalid> - 2017-05-13 12:11 -0700
Re: Microphone risk factors krw@notreal.com - 2017-05-13 20:36 -0400
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