Electronic digital compass

Details Electronic digital compass Electronic digital compass

1988-10-05

1990-04-24

Haroian, Harry N.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

324244, G01C 1730

Patent

active

049188240

ABSTRACT:
An electronic digital compass utilizes an amorphous magnetostrictive wire 100 exhibiting reentrant behavior as a core. A sense wiring 104 is wrapped about the core and the core is driven with a triangular wave through a drive coil 102. The earth's magnetic field biases the core 100 such that when the core 100 is driven to reentrant jumps the time duration between adjacent pulses induced into the sense winding 104 is related to the heading. A pair of such arrangements are used in physical 90 degree relationship to resolve ambiguities in heading angle. The resulting heading angle calculation is a true digital product which is independent of analog amplitude variations and requires little or no adjustment for high accuracy.

REFERENCES:
patent: 3400328 (1968-09-01), Penn et al.
patent: 4503621 (1985-03-01), Fowler
patent: 4520311 (1985-05-01), Petr et al.
patent: 4528481 (1985-07-01), Becker et al.
patent: 4587487 (1986-05-01), Zanzucchi
patent: 4591786 (1986-05-01), Koo et al.
patent: 4591788 (1986-05-01), Mohri et al.
patent: 4600885 (1986-07-01), Koo et al.
patent: 4687993 (1987-08-01), Mermelstein
patent: 4769599 (1988-09-01), Mermelstein
"Influence of Applied Tensile and Compressive . . . ", Kinoshita et al., IEEE MAG-22, No. 5, Sep. 1986.
"Bistable Magnetic Magnetization Reversal in 50 um Diameter . . . ", Malmhall et al., IEEE MAG-23, No. 5, Sep. 1987.
Letter from Isamu Ogasawara to J. G. Farrar dated Jul. 1, 1989, (not prior art).
"Magnetic Domains of Twisted Amorphous Ribbons", Livingston et al., MAG-20, No. 5, Sep. 1984.
"Sensitive Bistable Magnetic Sensors Using . . . ", Mohri et al., Applied Physics, vol. 53, No. 11, Nov. 1982.
"Pulse-Output Type Magnetic Sensors, Using . . . ", Mohri et al., MAG-19, No. 5, Sep. 1983.
Gordon et al., IEEE Trans. on Magnetics, MAG 1, No. 4, Dec. 1965, "Factors Affecting Sensitivity of Gamma Level Ring Core, etc.".
S. V. Marshall, IEEE Trans. on Magnetics, MAG 6, No. 2, Sep. '67, "An Analytic Model for the Flux Gate Magnetometer".
F. Primdahl, IEEE Trans. on Magnetics, MAG 6, No. 2, Jun. 1970, "The Gating Curves of Parallel and Orthogonal Flux-Gates".
J. R. Burger, IEEE Trans. on Magnetics, MAG 8, No. 4, Dec. 1972, "The Theoretical Output of a Ring Core Flux Gate Magnetometer".
D. I. Gordon, IEEE Trans. on Magnetics, MAG 8, No. 1, Mar. 1972, "Recent Advances in Flux-Gate Magnetometry".
H. D. Gardner, NASA Langly Research Center, LAR-13560, "Improved Flux-Gate Magnetometry".
Hilzinger, IEEE Trans. on Magnetics, MAG 19, No. 5, Sep. 1983, "Applications of Metallic Glasses in the Electronics Industry".
Mohri et al., IEEE Trans. on Magnetics, MAG 19, No. 5, Sep. 1983, "Magnetomer Using Two Amorphous Core Multivibrator Bridge".
Mohri, IEEE Transactions on Magnetics, MAG 20, No. 4, Sep. 1984, "Review of Recent Advances in the Field of Amorphous Metal etc.".
Boll et al., IEEE Trans. on Magnetics, MAG 19, No. 5, Sep. 1983, "Comparison of Amorphous Materials, Ferrites, and Permalloys".
Mohri et al., IEEE Trans. on Magnetics, MAG 20, No. 5, Sep. 1984, "Jitter-Less Pulse Generator Elements Using Amorphous etc.".
Mohri et al., IEEE Trans. on Magnetics, MAG 21, No. 5, Sep. 1985, "Large Barkhausem Effect and Matteucci Effect in Amorphous etc.".
Kinoshita et al., IEEE Trans. on Magnetics, MAG 22, No. 5, Sep. 86, "Influence of Applied Tensile and Compressive Stress on etc.".
Bajorek et al., IEEE Trans. on Magnetics, MAG 12, No. 6, Nov. 1976, "A Permalloy Current Sensor".

Affiliated with

Also associated with

Rating

Electronic digital compass does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic digital compass, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic digital compass will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-26618