Linear variable differential transformers for high precision...

Electricity: measuring and testing – Magnetic – Displacement

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C324S207120, C324S207240, C340S870360

Reexamination Certificate

active

11401782

ABSTRACT:
A linear variable differential transformer (LVDT) is disclosed that has first and second coil is formed of materials that minimize the Barkhausen noise, and hence which produces outputs that are substantially independent of any Barkhausen noise. In an embodiment, the Barkhausen independence is formed by making the coils of non-ferromagnetic materials. For example, other materials could be used that have a material as the core that does not include grain boundaries or does not include metastable magnetic.

REFERENCES:
patent: 2364237 (1944-12-01), Neff
patent: 2452862 (1948-11-01), Neff
patent: 2503851 (1950-04-01), Snow
patent: 2564221 (1951-08-01), Hornfeck
patent: 3005969 (1961-10-01), Wysocki
patent: 3891918 (1975-06-01), Ellis
patent: 3921114 (1975-11-01), Bridewell et al.
patent: 3986105 (1976-10-01), Nix et al.
patent: 4030085 (1977-06-01), Ellis et al.
patent: 4634126 (1987-01-01), Kimura
patent: 4667158 (1987-05-01), Redlich
patent: 4669300 (1987-06-01), Hall et al.
patent: 4705971 (1987-11-01), Nagasaka
patent: 5046427 (1991-09-01), Rowzee et al.
patent: 5046702 (1991-09-01), Miyazawa et al.
patent: 5256969 (1993-10-01), Miyajima et al.
patent: RE34489 (1993-12-01), Hansma et al.
patent: 5294850 (1994-03-01), Weh et al.
patent: 5381089 (1995-01-01), Dickmeyer et al.
patent: 5414939 (1995-05-01), Waugaman
patent: 5432444 (1995-07-01), Yasohama et al.
patent: 5461319 (1995-10-01), Peters
patent: 5465046 (1995-11-01), Campbell et al.
patent: 5469053 (1995-11-01), Laughlin
patent: 5477473 (1995-12-01), Mandl et al.
patent: 5513518 (1996-05-01), Lindsay
patent: 5705741 (1998-01-01), Eaton et al.
patent: 5739686 (1998-04-01), Naughton et al.
patent: 5767670 (1998-06-01), Maher et al.
patent: 5777468 (1998-07-01), Maher
patent: 5948972 (1999-09-01), Samsavar et al.
patent: 6043573 (2000-03-01), Neff et al.
patent: 6267005 (2001-07-01), Samsavar et al.
patent: 7038443 (2006-05-01), Proksch et al.
patent: 2002/0175677 (2002-11-01), Proksch et al.
patent: 2004/0075428 (2004-04-01), Proksch et al.
patent: 2006/0186876 (2006-08-01), Proksch et al.
patent: 2006/0186878 (2006-08-01), Proksch et al.
patent: 2006/0192551 (2006-08-01), Proksch et al.
patent: 2006/0202683 (2006-09-01), Proksch et al.
Bertram, H.N.,Theory of Magnetic Recording, Cambridge University Press, Cambridge, England, pp. 112-119, (1994).
Bozorth, R. M.,Ferromagnetism, Princeton, NJ, Van Nostrand, pp. 524-532, (1951).
Crommie, M.F., et al., “Confinement of Electrons to Quantum Corrals on a Metal Surface”,Science, vol. 262, pp. 218-220, (Oct. 8, 1993).
Drexler, K Eric, “Molecular directions in nanotechnology”,Nanotechnology, vol. 2, pp. 113-118, (1991).
Hristoforou, E., H., et al., “A Low Core Mass Linear Variable Differential Transformers Sensor Using Amorphous Wires”,Romanian Journal of Physics, 41(9-10):765-769, (1996).
Kano, Y., et al., “New Type LVDT Position Detector”,CPEM '88 Digest: 1988 Conference on Precisions Electromagnetic Measurements, Ed. Yasuharu Suematsu, Tsukuba, Japan, Tsukuba Research Center, pp. 95-96, (1988).
Meydan, T., et al., “Linear variable differential transformer (LVDT): linear displacement transducer utilizing ferromagnetic amourphous metallic glass ribbons”,Sensors and Actuators A: Physical, 32(1-3):582-587, (Apr. 1992).
Midgley, G.W., et al., “Improved Linearity Linear Variable Differential Transformers (LVDTs) Through the Use of Alternative Magnetic Materials”,Electric and Magnetic Fields: From Numerical Models to Industrial Applications, Ed. André Nicolet and R. Belmans, New York, NY, Plenum Press, pp. 311-314, (1995).
Park, Young Tae, et al., “Study on a Linear Variable Differential Transformer for Precision Measurements”,Korean Applied Physics, 2(4):347-351, (Nov. 1989).
Piner, Richard D., et al., “‘Dip-Pen’Nanolithography”,Science, vol. 283, pp. 661-663, (Jan. 29, 1999).
Saxena, Suresh C., et al., “A Self-Compensated Smart LVDT Transducer”,IEEE Transactions on Instrumentation and Measurement, 38(3):748-753, (Jun. 1989).
Herceg, E.E., “An LVDT Primer”,Sensors, pp. 27-30 (1996).
Sydenham, P.H., et al., “Low-cost, precision, flat inductive sensor”,Measurement, 15(3)179-188, Jun. 1995.

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

Linear variable differential transformers for high precision... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Linear variable differential transformers for high precision..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear variable differential transformers for high precision... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3836578

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