PSN-L Email List Message
Subject: Re: MEMSIC Accelerometers
From: Doug Crice dcrice@............
Date: Mon, 03 Jun 2002 12:42:51 -0700
I neglected to mention that the MEMSIC sensors are less than
Probably they aren't interesting to the PSN, but if you
wanted to instrument a high-rise or a bridge really cheap,
they might be.
> In a message dated 03/06/02, dcrice@............ writes:
> I saw some low-cost MEMS accelerometers at the Sensors Expo that
> looked interesting as strong-motion sensors.
> Hi Doug,
> Looking through the data sheets, the minimum noise is 0.3 milli g
> / root Hz, so at 10 Hz you would see about 1 milli g noise. The output
> sensitivity is quite temperature dependant. They don't sound very exciting.
> The ADXL05 is obsolete and has been replaced by the ADXL105 at 225
> micro g / root Hz. .
> Quoting Larry's findings:-
> The main difference between the ADXL05 and the Kinemetrics FBA-23A
> is the amount of background noise from the sensor itself. The ADXL05
> sensor has about +/-3 mg of internal noise and FBA-23A has less than 1 mg.
> Looking at Kinemetrics literature, they quote noise levels of the
> order of 1 micro g.
> I would not expect to see a great deal of improvement for the best
> Memsic over the ADXL105. Maybe there is a difference in price?
> The 3022's are quoted as giving 1 micro V p-p noise for 8 to 20 mV
> / g output to 50 Hz, which sounds about a factor of 10 better than the
> Chris Chapman.
Doug Crice http://www.georadar.com
19623 Via Escuela Drive phone 408-867-3792
Saratoga, California 95070 USA fax 408-867-4900
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