Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1974-11-29
1976-06-01
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33355R, 33363R, 324 47, G01C 1730, G01R 3302
Patent
active
039598896
ABSTRACT:
An apparatus is disclosed for determining a measured direction such as the direction of a ship or airplane relative to an external magnetic field such as the magnetic field of the earth. This apparatus comprises means for establishing a magnetic field rotating at constant angular velocity, located to influence the external magnetic field. The rotating magnetic field vector bears a known angular relationship as a function of time to the measured direction. A detector is located to be influenced by the rotating and external fields for detecting the occurrence of a predetermined angular relationship between the rotating and external magnetic field vectors. A timing device measures the time between occurrence of the predetermined angular relationship between the rotating and external field vectors and occurrence of the same predetermined angular relationship between the rotating field vector and the measured direction, and comparator means compares the measured time with the period of rotation of the rotating magnetic field. The resulting ratio of measured time to period is directly proportional to and thus indicates the angle which the measured direction makes relative to the external magnetic field. The apparatus may be provided with a display for indicating this angle or an error function for indicating deviation from a preselected angle.
Methods for indicating the measured direction relative to the external magnetic field and for indicating measured direction deviation from a preselected angle made with respect to the external field are also disclosed.
REFERENCES:
patent: 2036444 (1936-04-01), Tolson
patent: 2132183 (1938-10-01), Oakley
patent: 2837829 (1958-06-01), Fayers et al.
patent: 3634946 (1972-01-01), Star
patent: 3825823 (1974-07-01), Rovner
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