US3778703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting unlevelness of a pendulously supported flux valve by subjecting the valve to a vertical magnetic field
Assignee: Honeywell Inc
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Filing: 1971-12-20
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Granted: 1973-12-11
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Expires: 1991-12-20
Abstract
Abstract A pendulously mounted flux valve is tested for levelness by applying a vertically oriented alternating magnetic field across the flux valve. The pickup windings on the flux valve are connected to corresponding primary windings in a transolver. The rotor of the transolver is locked in alignment with the flux valve so as to produce quadrature voltages having relative magnitudes representative of any flux valve output voltages with respect to one axis of the valve. The voltages from the transolver are passed through individual signal processors each containing a filter that passes only those signals arising from the applied alternating magnetic field and a phase sensitive demodulator. The demodulator outputs are applied to the deflection plates of a cathode ray tube so as to produce a Lissajou figure consisting of a radial line having a magnitude indicative of the amount by which the plane of the flux valve is inclined with respect to the horizontal and an orientation indicative of the direction of the inclination.
Inventors
- 👤 J Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:05
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/0206
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
Apparatus for detecting unlevelness in a pendulously supported flux valve comprising a source of alternating current signals, means to apply a vertically oriented alternating magnetic field across said flux valve in response to said alternating current signals, means to receive voltages induced in each leg of the flux valve by said alternating magnetic field, means to resolve said induced voltages into quadrature components having a predetermined orientation with respect to said flux valve, means to provide output signals indicative of the magnitude and phase of each quadrature component with respect to said alternating current signals, and means for graphically displaying said output signals.
Claim 2
Dependent Claim
103 words
Apparatus for detecting unlevelness in a pendulously supported flux valve comprising a source of alternating current signals, means to apply a vertically oriented alternating magnetic field across said flux valve in response to said alternating current signals, means to receive voltages induced in each leg of the flux valve by said alternating magnetic field, means to resolve said induced voltages into quadrature components having a predetermined orientation with respect to said flux valve, means to provide output signals indicative of the magnitude and phase of each quadrature component with respect to said alternating current signals, and means for graphically displaying said output signals.
Claim 3
Dependent Claim
32 words
The apparatus of claim 1 wherein the means to apply the magnetic field is a cylindrical coil adjusted to encircle a flux valve to be tested and positioned with its axis vertical.
Claim 4
Dependent Claim
106 words
The apparatus of claim 2 wherein the flux valve to be tested is of the type containing a plurality of radially disposed nominally horizontal arms each containing a pickup coil, and the means to resolve said induced voltages is a transolver having individual primary windings corresponding to each pickup coil in the flux valve to be tested, said primary windings being spatially arranged to correspond to the pickup windings on said flux valve, said transolver further containing a pair of secondary windings arranged in space quadrature and positioned so that the axis of one secondary winding is aligned with the axis of a designated primary winding.
Claim 5
Dependent Claim
86 words
The apparatus of claim 3 wherein the means to provide output signals includes individual signal processors for each of said quadrature components, each of said signal processors containing a phase sensitive demodulator connected to receive reference signals from said source of alternating current whereby each phase sensitive demodulator produces an output signal having a polarity representative of the phase relationship of the corresponding quadrature component with respect to the alternating current from said source and a magnitude indicative of the magnitude of the corresponding quadrature component.
Claim 6
Dependent Claim
36 words
The apparatus of claim 4 wherein the graphical display means is a cathode ray tube having vertical and horizontal deflection plates connected to receive the output signals from the first and second phase sensitive demodulators, respectively.
Claim 7
Dependent Claim
31 words
The apparatus of claim 5 wherein each signal processor contains an input filter constructed to accept only quadrature components having a frequency substantially equal to that of said alternating current signals.
References Cited (Backward Citations)
US2887873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |