Browse Prior Art Database

Linear Position Sensing System

IP.com Disclosure Number: IPCOM000090683D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Arthur, WC: AUTHOR [+2]

Abstract

Wire 10, carrying an AC signal from source 11, is formed into a large number of undulations 12 which cause standing wave 26 to be impressed along transmitter strip 14. Wave 26 alternates in polarity with the AC signal. Transversely extending portions 12A are placed in transversely extending slots 13 formed in strip 14. At any given instant, the current directions in immediately adjacent portions are in the opposite directions as shown in adjacent portions 15, 16, and 17. C-shaped transducer 18 is disposed for longitudinal travel along strip 14. The span between the ends of transducer 18 is equal to the spacing between adjacent portions 12A. When transducer 18 has its pole faces disposed immediately above portions 19 and 20, there is a minimum or null signal induced in windings 22.

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Linear Position Sensing System

Wire 10, carrying an AC signal from source 11, is formed into a large number of undulations 12 which cause standing wave 26 to be impressed along transmitter strip 14. Wave 26 alternates in polarity with the AC signal. Transversely extending portions 12A are placed in transversely extending slots 13 formed in strip 14. At any given instant, the current directions in immediately adjacent portions are in the opposite directions as shown in adjacent portions 15, 16, and 17. C-shaped transducer 18 is disposed for longitudinal travel along strip
14. The span between the ends of transducer 18 is equal to the spacing between adjacent portions 12A. When transducer 18 has its pole faces disposed immediately above portions 19 and 20, there is a minimum or null signal induced in windings 22. The latter supply induced signals to utilization devices 23. When transducer 18, as shown by numeral 18', has its pole faces disposed intermediate two adjacent portions, such as between wire portions 15, 16, and 17, maximum flux is coupled to the core inducing a maximum amplitude signal in windings 22. The sensed signal is demodulated in devices 23. By digitally counting the demodulated peaks or crossovers, a digital coarse position is provided. Fine error detection is determined by directly monitoring the demodulated signal in its linear region. Such region is in close proximity to crossovers 25 in standing wave 26. Analog fine positioning and digital coa...