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Interpolation Between Periodic Measurements of Phase

IP.com Disclosure Number: IPCOM000093927D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Hahs, TS: AUTHOR

Abstract

Interpolations between periodic samplings are possible by a coarse phase comparison arrangement and a circuit for providing a vernier type reading by recording a time count under control of random event sensing devices.

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Interpolation Between Periodic Measurements of Phase

Interpolations between periodic samplings are possible by a coarse phase comparison arrangement and a circuit for providing a vernier type reading by recording a time count under control of random event sensing devices.

Electromechanical devices which convert displacement in space to shifts in phase of a signal are sometimes employed in measuring distances. In the example shown for measuring distance in a single direction, reference signal 10 is compared with a phase-shifted signal 11 for this purpose. Signal 10 is synchronized with or derived from time counter 15 which is reset to zero on positive passages of 10 through zero or null as at T1. When 11 passes through zero in a positive direction, detector 16 opens gate 18 to transfer the contents of 15 into register 19. The contents of 19 plus previous 19 contents, if any, provide a coarse determination of X distance.

The occurrence of a random event such as at T3 is sensed by event detector 20 to open gate 21 and cause the T3 contents of 15 to be transferred to 22. Logic circuitry or a computer, not shown, can use the contents and history of 19 and 22 to either interpolate or extrapolate from the periodic measurements of phase to the phase at the time of the event. In a system for measuring the movement of an object, detector 20 could be a contact sensing probe.

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