US4232265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring intensity of magnetic or electromagnetic fields using strain gauges mounted on ferromagnetic plates
Assignee: Individual
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Filing: 1978-04-17
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Granted: 1980-11-04
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Expires: 1998-04-17
Abstract
Abstract A device for converting the intensity of a magnetic or an electromagnetic field into an electric signal wherein movable elements are made as ferromagnetic plates rigidly fixed in supports so that their free ends overlap each other. Mounted on the deformation section in the immediate vicinity to the place where the ferromagnetic plate is fixed in its support is an element sensing the displacements of the free ends of the plates with respect to each other. The sensing element is made as at least one resistance strain gauge connected to a measuring circuit.
Inventors
- 👤 Vladimir A. Smirnov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:00
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; Y; Y10; Y10S; Y10S33/00; Y10S33/13
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
312 words
A device for measuring the intensity of a magnetic or electromagnetic field produced by a field source comprising: a first elongate flat plate formed of a ferromagnetic material having first and second end portions, said first end portion thereof being rigidly fixed to a first support member so that said first plate extends from said first support member in a cantilevered manner; a second elongate flat plate formed of a ferromagnetic material having respective first and second end portions, said first end portion thereof being rigidly fixed to a second support member so that said second plate extends from said second support member in a cantilevered manner, said second end portion of said first plate being located in spaced opposed relationship to said second end portion of said second plate to define a gap therebetween, said first and second plates forming a flux path for said field source; at least one of either said first and second plates and first and second support members comprising a deformation section in the region immediately proximate to the respective points at which said first and second plates are rigidly fixed to said first and second support members, respectively, said at least one deformation section being subject to deformation upon deflection of said first and second plates by said magnetic field; at least one resistance strain gauge means mounted on a respective one of said deformation sections and said at least one resistance strain gauge means having an axis appropriately aligned on said at least one of either said first and second plates for generating an electrical signal output indicative of the deformation of said deformed section caused by a relative displacement of said second end portions of said first and second plates upon deflection thereof; and a measuring circuit coupled to said at least one strain gauge means for measuring the electrical signal output thereof.
Claim 2
Independent Claim
312 words
A device for measuring the intensity of a magnetic or electromagnetic field produced by a field source comprising: a first elongate flat plate formed of a ferromagnetic material having first and second end portions, said first end portion thereof being rigidly fixed to a first support member so that said first plate extends from said first support member in a cantilevered manner; a second elongate flat plate formed of a ferromagnetic material having respective first and second end portions, said first end portion thereof being rigidly fixed to a second support member so that said second plate extends from said second support member in a cantilevered manner, said second end portion of said first plate being located in spaced opposed relationship to said second end portion of said second plate to define a gap therebetween, said first and second plates forming a flux path for said field source; at least one of either said first and second plates and first and second support members comprising a deformation section in the region immediately proximate to the respective points at which said first and second plates are rigidly fixed to said first and second support members, respectively, said at least one deformation section being subject to deformation upon deflection of said first and second plates by said magnetic field; at least one resistance strain gauge means mounted on a respective one of said deformation sections and said at least one resistance strain gauge means having an axis appropriately aligned on said at least one of either said first and second plates for generating an electrical signal output indicative of the deformation of said deformed section caused by a relative displacement of said second end portions of said first and second plates upon deflection thereof; and a measuring circuit coupled to said at least one strain gauge means for measuring the electrical signal output thereof.
Claim 3
Dependent Claim
55 words
A device as claimed in claim 1 wherein said field source comprises an elongate current conduit and which device further comprises: means rigidly coupled to said first and second support members for rotating the same and for thereby rotating the axis of said resistance strain gauge means with respect to that of said current conduit.
Claim 4
Dependent Claim
81 words
A device as claimed in claim 1 wherein said field source comprises a permanent magnet mounted for rotation with respect to said ferromagnetic plates; and further including means for displacing said permanent magnet with respect to said ferromagnetic plates whereby upon such displacement the plates will be correspondingly deflected so as to vary the resistance of said resistance strain gauge means, the value of the output signal of which serves as an additional indication of the position of said permanent magnet.
Claim 5
Dependent Claim
73 words
A device as claimed in claim 1, further comprising a control magnetizing coil and an AC voltage source, and wherein said measuring circuit includes an amplifier-converter having an output coupled to said control magnetizing coil and an input coupled to said AC voltage source whereby a variation in the magnetic field of said coil effects a corresponding deflection of said plates so as to vary the resistance of said resistance strain gauge means.
Claim 6
Dependent Claim
60 words
A device as claimed in claim 1, wherein each of said first and second plates has an inner surface facing in directions toward that of the other and an outer surface facing in directions away from that of the other, and said resistance strain gauge means comprises a single resistance strain gauge on the outer surface of said first plate.
Claim 7
Dependent Claim
74 words
A device as claimed in claim 1, wherein each of said first and second plates has an inner surface facing in directions toward that of the other and an outer surface facing in directions away from that of the other, and said resistance strain gauge means comprises a first resistance strain gauge on the outer surface of said first plate and a second resistance strain gauge on the inner surface of said first plate.
Claim 8
Dependent Claim
100 words
A device as claimed in claim 1, wherein each of said first and second plates has an inner surface facing in directions toward that of the other and an outer surface facing in directions away from that of the other, and said resistance strain gauge means comprises a first resistance strain gauge on the outer surface of said first plate, a second resistance strain gauge on the inner surface of said first plate, a third resistance strain gauge on the inner surface of said second plate and a fourth resistance strain gauge on the outer surface of said second plate.
Claim 9
Dependent Claim
77 words
A device as claimed in claim 7, wherein said first, second, third and fourth resistance strain gauges are electrically connected as the arms of an electric bridge between corresponding ones of four connection points of said bridge, said measuring circuit being electrically connected to two of said connection points, and further comprising a source of supply voltage for energizing said bridge, said source of supply voltage being electrically connected to the other two of said connection points.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |