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Infrasound monitor, any experiances?
2E7AH
post Jan 11 2010, 23:24
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I'm approaching my thesis in meteorology (2 final exams to go) and while I originally intended to write simple 1-column prediction model in FORTRAN, I'm considering also including calculation for low frequency acoustic waves.
I won't invent new boundary-layer column model but extend current to calculate propagation of < 12 Hz acoustic waves

Does anyone have any experience with equipment needed for monitoring infrasounds?
Is building microbarograph good choice?
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Woodinville
post Jan 12 2010, 20:15
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QUOTE (2E7AH @ Jan 11 2010, 14:24) *
I'm approaching my thesis in meteorology (2 final exams to go) and while I originally intended to write simple 1-column prediction model in FORTRAN, I'm considering also including calculation for low frequency acoustic waves.
I won't invent new boundary-layer column model but extend current to calculate propagation of < 12 Hz acoustic waves

Does anyone have any experience with equipment needed for monitoring infrasounds?
Is building microbarograph good choice?


A large-diaphram RF condenser microphone with tight seal would probably work splendidly here.

With that, and using some correction in frequency response, you can get down to milliHz.


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J. D. (jj) Johnston
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2E7AH
post Jan 12 2010, 21:52
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I found DIY circuit board, where diaphragm was made with chocolate foil smile.gif and supposedly test went well compared to small diaphragm capsule (Sennheiser MKH 415)

Then I found this, which includes good explanations, simple diaphragm circuit for low freq. and inexpensive A/D converter

Although I'm wondering how to make the diaphragm if I decide to try it, I guess that's it
Thanks for pointing to right direction
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