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Amplification of Extremely Low DC Currents and Voltages

IP.com Disclosure Number: IPCOM000092339D
Original Publication Date: 1967-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Bornhauser, H: AUTHOR

Abstract

The DC current or voltage to be measured generates, proportional to itself, a magnetic field by a coil S1. In this field, another coil S2 oscillates very rapidly at a constant frequency and amplitude vertically transversely in relation to the lines of flux. Thus an AC voltage U proportional to the measuring current in coil S1 is induced in coil S2. The linear reciprocal motion of coil S2 is generated, for example, by a magnetostriction oscillating system M operating at a frequency of some 20 kcps.

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Amplification of Extremely Low DC Currents and Voltages

The DC current or voltage to be measured generates, proportional to itself, a magnetic field by a coil S1. In this field, another coil S2 oscillates very rapidly at a constant frequency and amplitude vertically transversely in relation to the lines of flux. Thus an AC voltage U proportional to the measuring current in coil S1 is induced in coil S2. The linear reciprocal motion of coil S2 is generated, for example, by a magnetostriction oscillating system M operating at a frequency of some 20 kcps.

For the purpose of indication or recording, the AC voltage U can be effectively selectively amplified by an AC voltage amplifier preferably using the frequency of oscillating system M.

Oscillating coil S2 can also be used for measuring low magnetic fields, for example, the geomagnetic field, as well as small low-frequency AC currents. The amplitude modulation of the 20 kcps. measuring voltage generated by their magnetic field is rectifier-detected and indicated separately.

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