Patent ID: 8280666
Filing Date: 2012-10-02
Classification: G01D,G01P

Abstract:
1. A dynamic motion sensor calibration system comprising: a shaker table; a dynamic motion sensor under test (SUT), said SUT having a sensing axis aligned with a primary axis of motion of said shaker table; a source which generates a drive signal sufficient to drive exciter, over at least a low frequency range; an exciter capable of generating a long stroke at a low frequency and of sufficient force to move said SUT on said shaker table; a non-contact optical displacement sensor having a precalibrated grating, said optical displacement sensor connected to said shaker table such that movement of said optical displacement sensor past a light source produces an optical pattern representative of the position of said shaker table sufficient to establish a positional reference; a processing unit comprising at least one analog to digital converters (ADC), said processing unit configured and arranged to acquire, at identifiable times, analog output signals from said SUT and said optical displacement sensor; said processing unit further configured to compute a second, time derivative of said positional reference as a reference acceleration and a synchronous acceleration signal from said SUT; and to compare said reference acceleration with said synchronous acceleration signal.