Magnetic field intensity measuring device with frequency change indication
First Claim
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1. A magnetic field measuring device adapted for being connected between first and second potentials of a direct current electrical power source and for providing a signal whose frequency of oscillation is indicative of the intensity of external magnetic fields sensed by said device, said detector comprising:
- first and second nonlinear amplifiers each of which is comprised of a P-channel field effect transistor and an N-channel field effect transistor connected in an inverter configuration such that the drains of said transistors form a first common electrical junction and the gates of said transistors are connected in parallel to form a second electrical junction;
a core comprised of magnetic material, said core being straight in shape, so as to produce directivity of measurement of said magnetic field along the longitudinal axis of said core; and
a coil of wire encompassing said core having one end connected to the first common electrical junction of said first nonlinear amplifier and to the second common electrical junction of said second nonlinear amplifier, and having the other end connected to the first common electrical junction of said second nonlinear amplifier and to the second common electrical junction of said first amplifier;
wherein when the source of said P-channel field effect transistor in each of said amplifiers is connected to said power source so that said first potential is applied thereto, and the source of said N-channel field effect transistor in each of said amplifiers is connected to said power source so that said second potential is applied thereto, substantially the first and second potentials are applied across said coil with the direction of current through the coil reversing at a switching rate which is indicative of the intensity of external magnetic fields sensed by said device.
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Abstract
A device powered by a DC source produces an output signal the frequency of which changes as a function of changes in external magnetic fields sensed by such device. A pair of non-linear amplifiers are interconnected so that the output of one amplifier is the input of the other amplifier. An inductive sensor is connected between the outputs of the amplifiers. The inductive sensor has an elongated magnetic core and a coil is wound on the core. The voltages at the outputs of the amplifiers, across the inductive sensor, switch between zero and the full voltage of the DC source.
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Citations
1 Claim
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1. A magnetic field measuring device adapted for being connected between first and second potentials of a direct current electrical power source and for providing a signal whose frequency of oscillation is indicative of the intensity of external magnetic fields sensed by said device, said detector comprising:
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first and second nonlinear amplifiers each of which is comprised of a P-channel field effect transistor and an N-channel field effect transistor connected in an inverter configuration such that the drains of said transistors form a first common electrical junction and the gates of said transistors are connected in parallel to form a second electrical junction; a core comprised of magnetic material, said core being straight in shape, so as to produce directivity of measurement of said magnetic field along the longitudinal axis of said core; and a coil of wire encompassing said core having one end connected to the first common electrical junction of said first nonlinear amplifier and to the second common electrical junction of said second nonlinear amplifier, and having the other end connected to the first common electrical junction of said second nonlinear amplifier and to the second common electrical junction of said first amplifier; wherein when the source of said P-channel field effect transistor in each of said amplifiers is connected to said power source so that said first potential is applied thereto, and the source of said N-channel field effect transistor in each of said amplifiers is connected to said power source so that said second potential is applied thereto, substantially the first and second potentials are applied across said coil with the direction of current through the coil reversing at a switching rate which is indicative of the intensity of external magnetic fields sensed by said device.
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Current AssigneeSalomon SA (Anta International Group Holdings Ltd.)
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Original AssigneeHughes Aircraft Company (Rtx Corporation)
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InventorsLong, James C., Good, William R., Willner, Monroe J.
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Primary Examiner(s)Strecker, Gerard R.
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Application NumberUS06/027,970Time in Patent Office974 DaysField of Search324/244, 324/249, 324/253-255, 324/258, 324/260, 324/117 R, 331/65, 331/114, 331/108 D, 331/111, 331/112, 331/113 R, 331/113 A, 331/116 FE, 331/117 FEUS Class Current324/253CPC Class CodesG01R 33/02 Measuring direction or magn...
