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From: "mook johnson"
Subject: vibration measurement circuit (vibration gurus please help)
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Sun, 27 Oct 2002 00:42:42 GMT
NNTP-Posting-Date: Sat, 26 Oct 2002 19:42:42 CDT
Organization: Road Runner - Texas
I'd like to get a graph of the vibration level (Gs) over a frequency range
of 10 to 5kHz
The vibration to be measured would be continuous or slowly changing over
Seven bands over that interval would be sufficient resolution of the
Is it valid to do this using an Analog Devices accelerometer to feed 7
then measure the peak amplitude of each of the 7 BP outputs?
I was thinking of using peak detectors to hold the peak experienced in each
band over a 300mS period then use an A2D to sample the peak in each band.
I only have an 8051 or MicroChip PIC running at 7.3MHz to do the processing,
A2D manipulation and serial communication to the host at 9600 bps. 3
different axes will be sampled over the 1 second period and the host will
request an update at 1 /second.
I think FFT is out due to limited processing power and limited local RAM for
storing the raw waveform.
Is this a valid approach? Will this be useful data for verifying
qualification vibration levels for a device to be used in the same
The desired display on the computer screen would be 3 graphs with G(peak) on
the Y axis and frequency on the X axis.
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