Analog weighted binary absolute position encoder including an ar

Electricity: measuring and testing – Magnetic – Displacement

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

324252, 137554, 341 15, 338 32R, 25023113, 2503571, G01B 714, G01R 3306, H03M 122, G01D 534

Patent

active

055023800

ABSTRACT:
A magnet mounted on a moving stem or rotary member of a valve generates magnetic flux over part of a stationary member of the valve which has an uniquely patterned set of magnetoresistive sense resistors and three reference resistors (the sensor) disposed thereon. The distance between two adjacent patterns can be equally spaced, or can be compressed for valves with non-linear characteristics in order to achieve increased resolution over a specific portion of the valve travel. Other embodiments can use a light source, beta radiation or neutron radiation as the source of flux, the pattern for each embodiment's sensor having some material responsive and some unresponsive to the flux. The sensor can provide feedback representative of position in a valve positioner, or functions as the position sensor in a position transmitter.
Reference resistors provide a first signal representative of the resistance of a sense resistor in the absence of the flux and a second signal representative of the additive resistance of a sense resistor which is caused by the flux. An A/D circuit connected to the sense resistors differences the sensed resistance of each sense resistor with the first signal to calculate a referenced additive resistance and then ratios the difference with the second signal, weights the ratio by an appropriate weighting function and sums the referenced additive resistance for each of the sense resistors to provide the position sensor output.

REFERENCES:
patent: 3555285 (1971-01-01), Irving
patent: 4039936 (1977-08-01), Jones et al.
patent: 4236074 (1980-11-01), Chen
patent: 4319188 (1982-03-01), Ito et al.
patent: 4418372 (1983-11-01), Hayashida et al.
patent: 4429276 (1984-01-01), Narimatsu et al.
patent: 4631519 (1986-12-01), Johnston
patent: 4633224 (1986-12-01), Gipp et al.
patent: 4717979 (1988-01-01), Washisu
patent: 4779211 (1988-10-01), March
patent: 4785241 (1988-11-01), Abiko et al.
patent: 4786870 (1988-11-01), Kawamata et al.
patent: 4801830 (1989-01-01), Ogino et al.
patent: 4847584 (1989-07-01), Pant
patent: 4853631 (1989-08-01), Carmen
patent: 4866382 (1989-09-01), Carmen
patent: 4926154 (1990-05-01), Heremans et al.
patent: 5115239 (1992-05-01), Ushiyama
Encoder Products Company Catalog, "The Responsive People In Motion", 1992.
J. P. J. Groenland, "Magnetoresistive Transducer for Absolute Position Detection", IEEE Transactions on Magnetics, vol. MAG-20, No. 5, pp. 969-971, Sep. 1984.
D. Wobschall and M. Smolen, "A Patterned Capacitive Absolute Displacement Sensor", SENSORS, pp. 50-52, Aug. 1992.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Analog weighted binary absolute position encoder including an ar does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Analog weighted binary absolute position encoder including an ar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analog weighted binary absolute position encoder including an ar will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-918460

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.