Choosing your accelerometer.

http://www.intl-sensor.com Time:2008/8/21 14:32:18 Count : 2474 Times

How to decide which accelerometer is right for your application, the following points may help you decide.

1. What input does your measuring system have? If you can accept pico-coulombs and milli-volts then you are free to choose any accelerometer. If however you do not have or wish to buy a charge amplifier, to allow you to measure the output of a charge type accelerometer then you must choose the IEPE type.

2. What are you trying to measure – will the mass or weight of the accelerometer change what you are measuring; if it might then you need a low mass accelerometer.

3. What is the likely acceleration level – if it is very low then you may need a sensitive accelerometer, at least 10pC per g. On the other hand if it is a shock input you will need an accelerometer with a low sensitivity if it is an IEPE type. Remember a shock or hammer blow can have a peak acceleration of at least 2000 g so a 1mV sensitivity in an accelerometer will immediately produces a 2volt output. If you have chosen a 10mV per g sensitivity this will mean 20V output and that may well overload your IEPE input.

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