Patent US1023499A successfully refreshed from Google Patents.
US3885873A
Expired / Lapsed
US
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Device for measuring the relative movement between two objects
Assignee: KTH Royal Institute of Technology
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Filing: 1972-12-12
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Granted: 1975-05-27
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Expires: 1992-12-12
Abstract
Abstract A device for measuring the relative movement between two objects of the kind having two sensors mounted on one of the objects in spaced-apart positions along the direction of relative motion between the objects is disclosed. Irregularities sensed on the other object generate two substantially equal signals displaced in time as a function of the spacing between the two sensors and the rate of relative movement between the two objects. One of the signals is periodically sampled and stored. The stored signal is compared with the other signal to form a differential signal. The differential signal is periodically and alternately supplied to opposite polarity inputs of an integrator, the output signal of which is used to generate a frequency signal proportional to the rate of movement between the two objects.
Inventors
- 👤 Nils Ingvar Andermo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:01
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/64; G01P3/80; G01P3/806
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
181 words
A device for measuring the relative movement between two objects, comprising two sensors mounted on one of said objects in spaced-apart positions along the direction of relative motion between said objects to sense irregularities on the other object and generate two signals of substantially equal shape, but displaced in time as a function of the relative speed between the two objects, sampling means for periodically sampling one of said signals and storing the sampled signal value, comparison means for comparing the stored signal value with the other signal and forming a differential signal, a switch unit means for alternately and periodically supplying the differential signal to opposite polarity inputs of an integrator during two selected time intervals, a voltage-to-frequency converter supplied with the outpUt signal from the integrator and arranged to generate a frequency signal, and a control unit means supplied with said frequency signal for controlling the operation of the sampling means and the switch unit means so as to cause the frequency of the output signal from the converter to become proportional to the relative speed between said objects.
Claim 2
Independent Claim
181 words
A device for measuring the relative movement between two objects, comprising two sensors mounted on one of said objects in spaced-apart positions along the direction of relative motion between said objects to sense irregularities on the other object and generate two signals of substantially equal shape, but displaced in time as a function of the relative speed between the two objects, sampling means for periodically sampling one of said signals and storing the sampled signal value, comparison means for comparing the stored signal value with the other signal and forming a differential signal, a switch unit means for alternately and periodically supplying the differential signal to opposite polarity inputs of an integrator during two selected time intervals, a voltage-to-frequency converter supplied with the outpUt signal from the integrator and arranged to generate a frequency signal, and a control unit means supplied with said frequency signal for controlling the operation of the sampling means and the switch unit means so as to cause the frequency of the output signal from the converter to become proportional to the relative speed between said objects.
Claim 3
Dependent Claim
41 words
A device for measuring the relative movement between two objects as recited in claim 1 further comprising indicator means supplied with said frequency signal for indicating the rate of movement between the two objects as a function of said frequency signal.
Claim 4
Dependent Claim
38 words
A device for measuring the relative movement between two objects as recited in claim 1 further comprising second sampling means controlled by said control unit means for periodically sampling said other signal and storing the sampled signal value.
Claim 5
Dependent Claim
110 words
A device for measuring the relative movement between two objects as recited in claim 1 wherein said sampling means comprises a single pole, single-throw switch means controlled by said control unit means to periodically close to sample one of said signals, a plurality of storage capacitors, each having one plate connected to the single pole of said switch means, and a plurality of switches each connected to the other plate of a corresponding one of said plurality of storage capacitors and a reference potential, said plurality of switches being controlled by said control unit means for periodically and sequentially closing to connect said other corresponding plate to said reference potential.
References Cited (Backward Citations)
US3689157A
Cited
US3804517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |