Patent ID: 7860681

Claim:
An apparatus for providing measurements indicative of incremental angular displacement of a machine element which is a member of a mechanical motion transmission system: a) A displacement sensing means coupled to said machine element and responsive to motion thereof through indicative, small, equal segments of displacement (K) of said machine element for generating a signal for each occurrence of small motion thereof, said motion being a fraction of a full-cycle of operation; b) means responsive to at least one said signal for providing an indication of one cycle of operation of said machine element; c) signal processing means for displaying the small equal segments of displacement (K) on a Cartesian coordinate or other suitable graph whereby the said segments of displacement (K) are equally spaced and sequentially numbered on the X-axis and identified as K 1 , K 2 . . . K n , whereby the subscripts 1,2, . . . n identify the sequence numbers, the said X-axis being referred to as the phase-domain axis; and d) signal processing means to provide a measurement of displacement of the machine element by way of successive addition of the equal segments of displacement (K), thereby producing the Y-axis on said graph.