Patent Document ID: 8577641
Application ID: 13602268
Patent Status: 1

Claim One:
1. A method for calibration of a dynamic motion sensor under test (SUT) by simultaneous direct measurement of position and time, comprising: sending by a computer a low frequency electrical driving signal having an adjustable amplitude from an electrical source to an exciter, thereby generating a harmonic movement in an associated shaker table; mounting said SUT on said shaker table such that the primary sensing axis of said SUT is generally parallel to the axis of motion of said shaker table; adjusting said electrical driving signal amplitude using said computer, thereby adjusting the magnitude of movement imparted to said SUT; using a non-contact optical position sensor to produces an electrical optical position sensor output representative of position for attaining a desired degree of positional accuracy; reading said electrical optical position sensor output as the reference for position as a function of time using said computer; mathematically computing the instantaneous acceleration of said shaker table and said SUT as the second time derivative of said electrical optical position sensor output as a function of time using said computer; reading said electrical optical position sensor output of said SUT as a function of time using said computer; comparing at an identifiable time said electrical optical position sensor output of said SUT with said computed instantaneous acceleration using said computer; and comparing said electrical optical position sensor output of said SUT with said instantaneous acceleration at a plurality of frequencies sufficient to define the performance characteristics of said SUT within a selected frequency range using said computer.