专利汇可以提供Compensation of parasitic or stray magnetic fields, especially aboard an aircraft专利检索,专利查询,专利分析的服务。并且A magnetometer head generates a e.m.f. f1 at a frequency phi 1 proportional to (Ho+ Delta H1), value of the total magnetic field intensity at a first point aboard a plane or similar object; a frequency meter derives from frequency f1 a voltage e1 proportional to phi 1; at a second point (located aboard said plane or object), where the magnetic field intensity is (Ho+ Delta H2), a nuclear filter is fed by e.m.f. f1 and delivers an e.m.f. f2 out of phase with f1 by d phi proportional to ( Delta H2- Delta H1); a phase-meter is fed by f1 and f2 and delivers a voltage e2 proportional to d phi ; an amplifier having an adjustable gain amplifies the output of said phase-meter and delivers a voltage e3; a subtraction unit receives voltages e1 and e3 and delivers a voltage e4 proportional to (e1-e3), said voltage e4 being a measure of the external magnetic field Ho to be measured as e1 is proportional to (Ho+ Delta H1) and e3 is proportional (with the same proportionality factor) to Delta H1 if Delta x x( cube root Rho -1) and k2. phi /k1 x/3 WITH Delta H1 parasitic magnetic field in the first point, Delta H2 parasitic magnetic field in the second point, Delta X DISTANCE BETWEEN THE FIRST AND THE SECOND POINT, X DISTANCE OF THE FIRST POINT FROM THE BARYCENTER OF THE PARASITIC MAGNETIC SOURCES, K1 THE PROPORTIONALITY FACTOR BETWEEN F1 AND (Ho+ Delta H1), k2 the proportionality factor between f2 and ( Delta H2- Delta H1), phi (function of x) adjustable gain of said amplifier, Rho RATIO BETWEEN Delta H2 and Delta H1, i.e. Rho Delta H2/ Delta H1 In a modification, at the first point a magnetometerhead, identical to the head located in the first point, is substituted to said filter, and a differential frequency-meter fed by the outputs of both heads is substituted to said phase-meter.,下面是Compensation of parasitic or stray magnetic fields, especially aboard an aircraft专利的具体信息内容。
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