Patent ID: 7411124

Claim:
A self-calibrating transducer system for converting a physical quantity expressing motion of a manipulator on a trajectory to a data signals, comprising: a first signal generator producing said data signal, a magnitude of which is representative of said physical quantity on said trajectory; a second signal generator producing a calibration signal, a magnitude of which is representative of a predetermined value of said physical quantity at unique points on said trajectory; a data accumulator connected to said first signal generator and said second signal generator, and accumulating a series of values of said magnitude of said data signal on said trajectory, another series of values of said magnitude of said calibration signal and pieces of tag data making the values of said magnitude of said data signal correlated with the values of said magnitude of said calibration signal; a data analyzer connected to said data accumulator, estimating a value of said physical quantity of said data signal at a certain point on said trajectory on the basis of said predetermined value of said physical quantity and a value of said magnitude of said data signal at said certain point, and determining a relation between said physical quantity and said magnitude of said data signal along said trajectory so as to memorize said relation therein; and a determiner connected to said data analyzer and said first signal generator, and responsive to said data signal so as uniquely to make values of said magnitude of said data signal correspond to values of physical quantity of said manipulator at any point on said trajectory with reference to said relation memorized in said data analyzer.