Meaureing low frequency vibrations - Raspberry Pi Forums
i wish measure vibrations come sound - or else, connected me laptop. sound under 100 hz since can never heard. felt mild pressure sensation. may refer "sound", perhaps better call else.
goal not extremely accurate level of whatever unit, rather accurate - , consistent reading - if 'sound' remains same each time measured.
had used vibrometer app on smart phone (a samsung galaxy s4). able see 'ordinary' events within building used resulted in relatively low reading, 'sound' - knew present due feeling produces, produced higher reading.
so, saw work. on time characteristics of 'sound' changed, , although still feel it, reading on phone app noticeably lower. suspect frequency lowered rather power or amplitude.
so, looking better way measure sound. i've been told best not view measuring 'sound', since implies 'audio' frequencies on 200 hz, , equipment available purpose not suited low frequencies.
ideally, i'd able measure sound, , in form of digital output can record computer - strong preference rs232. rather not play sort of analog output of little use me. i'd need convert that, , not want go through hassle.
looked @ devices on ebay
http://www.ebay.com/itm/vm-6360-digital ... 4abc715370
("vm-6360 digital vibration tester meter vibrometer")
had questions didn't know how answer. first, wanted idea of how phone app perform @ lower frequencies compared devices this. example, if phone app handle frequencies down 5 hz, perhaps gadget not useful. if phone app handled frequencies down 80 hz, perhaps device useful me.
secondly, not @ sure if sort of device able measure vibrations in air. suspect these devices meant bolted machinery being evaluated. know phone app not use microphone - rather other sensors within phone. so, guess these devices do.
i'd appreciate insight.
goal not extremely accurate level of whatever unit, rather accurate - , consistent reading - if 'sound' remains same each time measured.
had used vibrometer app on smart phone (a samsung galaxy s4). able see 'ordinary' events within building used resulted in relatively low reading, 'sound' - knew present due feeling produces, produced higher reading.
so, saw work. on time characteristics of 'sound' changed, , although still feel it, reading on phone app noticeably lower. suspect frequency lowered rather power or amplitude.
so, looking better way measure sound. i've been told best not view measuring 'sound', since implies 'audio' frequencies on 200 hz, , equipment available purpose not suited low frequencies.
ideally, i'd able measure sound, , in form of digital output can record computer - strong preference rs232. rather not play sort of analog output of little use me. i'd need convert that, , not want go through hassle.
looked @ devices on ebay
http://www.ebay.com/itm/vm-6360-digital ... 4abc715370
("vm-6360 digital vibration tester meter vibrometer")
had questions didn't know how answer. first, wanted idea of how phone app perform @ lower frequencies compared devices this. example, if phone app handle frequencies down 5 hz, perhaps gadget not useful. if phone app handled frequencies down 80 hz, perhaps device useful me.
secondly, not @ sure if sort of device able measure vibrations in air. suspect these devices meant bolted machinery being evaluated. know phone app not use microphone - rather other sensors within phone. so, guess these devices do.
i'd appreciate insight.
raspberrypi
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