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Determining the Smallest Acceleration an Accelerometer Can Measure
Doing research on MEMS accelerometers, interested in a method to determine the smallest amount of acceleration a sensor can measure.

Hello all,

I'm currently doing research on MEMS accelerometers, frequency range dc to 1000 hz and accelerations less than 3ms^2 (0.306g), in comparison to piezo electric ones. Since the noise floor of a MEMS sensor is inferior to that of a piezo, my goal is to determine the smallest amount of acceleration that a MEMS can measure before the accelerations drown into the noisefloor of the sensor.

I'm using a PAK DAQ that handles the data coming from the piezo and MEMS under test, a signal generator that can generate various signals (sine, sweep, noise, etc), and a shaker. All sensors are attached to a large metal block on rubber feet.

My first guess is to put with noise with a low pass filter set to 1000hz and lower the amplitude until the noise floor is reached. Or maybe use a single sine at various frequencies, and lower their amplitudes until the noise floor gets reached.

Does anyone have experience with these kind of measurements and would like to share them with me?

Thanks for any help.