QUATERNION DATA ANALYSIS OF THREE AXIS ACCELERATION MEASURED WITH NEWLY DEVELOPED SMALL SENSOR BALL

Hiroki Yamamoto, Nobuharu Aoshima

Abstract

In order to show a concrete application of the signal processing based on quaternion expression, a prototype of sealed measurement module which could be thrown into the stream of liquid or powdery materials was developed. This module’s shape is a small ball of about 40 mm across in diameter. And it consists of low power one-chip microcontroller, a couple of dual axis accelerometer, EEPROM, and batteries. So that, it can measure and record three dimensional acceleration by itself. As a preliminary experiment, the small sensor ball were suspended with a thick cord and swung by the speed controlled motor. Then, the data recorded under such condition were analyzed by using the spectra upon a form of quaternion. Through the experiments and observations, we could confirm that the small sensor ball could acquire data successfully. And, the relationships between the trend of the ball’s motion and recorded data were considered under the present test condition. If the weight and measuring range are improved in futer, this sensor ball system will grow to an evaluating system of a state of stream in a closed container such as mixing or churning device.

Keywords

three axis acceleration, quaternion, stand-alone sensor

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PWC-2003-TC15-009.pdf

DOI

-

IMEKO TC

TC15 - Experimental Mechanics

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