Patent US3448344A successfully refreshed from Google Patents.
US3654479A
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Monitoring apparatus
Assignee: Alcatel Lucent SAS
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Filing: 1970-09-24
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Granted: 1972-04-04
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Expires: 1990-09-24
Abstract
Abstract An apparatus for producing an output signal which is representative of the phase shift between two signals. Two input signals are used to generate a sawtooth signal which is compared to a reference sawtooth signal. The instantaneous amplitude difference between the sawtooth generated by the input and the reference sawtooth is proportional to the phase difference of these signals and an output representative of the phase difference is produced by the apparatus. The output signal can be used, for instance, to control the speed of rotation of an object.
Inventors
- 👤 Jean-Michel Catherin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:48
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/20; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/56; G01P3/565; G01R; G01R25/00; G04; G04F; G04F10/00; G04F10/06; G04G; G04G7/00; G05D3/14; G05D3/18; H; H02; H02P; H02P23/00; H02P23/18; H02P23/186; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/902; Y10S388/907; Y10S388/915
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
191 words
Apparatus for monitoring variations in the rotary speed of a rotating body in relation to a reference speed comprising: a generator means for providing a first signal A dependent upon the instantaneous angular speed of the body; means for providing a second signal B identical to the first signal and in phase quadrature therewith; a first sawtooth signal source means connected to receive the first and second signals and adapted to provide a first sawtooth signal wherein the total duration of four successive cycles is substantially equal to the period of the first signal and one cycle of the four is synchronized with the first quarter period of the first signal following a minimum value; a second sawtooth signal source means for providing a second sawtooth signal identical to the first sawtooth signal when the speed of the body is equal to the reference speed; and phase shift measuring means connected to receive the first and second sawtooth signals and arranged to provide an output signal indicative of their phase relation, whereby variations in the output signal reflect variations in the speed of the body with respect to the reference speed.
Claim 2
Dependent Claim
191 words
Apparatus for monitoring variations in the rotary speed of a rotating body in relation to a reference speed comprising: a generator means for providing a first signal A dependent upon the instantaneous angular speed of the body; means for providing a second signal B identical to the first signal and in phase quadrature therewith; a first sawtooth signal source means connected to receive the first and second signals and adapted to provide a first sawtooth signal wherein the total duration of four successive cycles is substantially equal to the period of the first signal and one cycle of the four is synchronized with the first quarter period of the first signal following a minimum value; a second sawtooth signal source means for providing a second sawtooth signal identical to the first sawtooth signal when the speed of the body is equal to the reference speed; and phase shift measuring means connected to receive the first and second sawtooth signals and arranged to provide an output signal indicative of their phase relation, whereby variations in the output signal reflect variations in the speed of the body with respect to the reference speed.
Claim 3
Dependent Claim
32 words
Apparatus as claimed in claim 1, wherein the generator includes a first pick-up means for sensing markers carried by the body which are equiangularly spaced around the rotation axis of the body.
Claim 4
Dependent Claim
17 words
Apparatus as claimed in claim 2, wherein the markers are equiangularly spaced striations on the body perimeter.
Claim 5
Dependent Claim
29 words
Apparatus as claimed in claim 2, wherein the markers are equiangular sector-shaped striations carried by a disc rotating with the body and about the same axis as the body.
Claim 6
Dependent Claim
15 words
Apparatus as claimed in claim 3, wherein the first pick-up means is a photoelectric element.
Claim 7
Dependent Claim
28 words
Apparatus as claimed in claim 2, further comprising a second pick-up means for sensing the markers at a position angularly spaced from that of the first pick-up means.
Claim 8
Dependent Claim
189 words
Apparatus as claimed in claim 1, wherein the first sawtooth signal source means includes: first and second inverter means connected to receive the first and second signals respectively and to provide third and fourth signals A and B respectively, said signals A and B identical to the first and second signals respectively and in phase opposItion thereto; a first comparator means with two inputs connected to receive signals A and B, and to provide at is output a fifth signal C when B exceeds A and no output signal when B is less than A; a second comparator means with two inputs connected to receive two of the signals A and B and to provide at its output a sixth signal D when B exceeds A and no output signal when B is less than A; and four gates each connected to receive one of the signals A, A, B, B and the outputs of the comparator means said gates opening sequentially in the phase order to their respective signals, each for a quarter period of that signal which does not include a maximum or minimum of the signal.
Claim 9
Dependent Claim
30 words
Apparatus as claimed in claim 7, wherein each gate is open for a quarter period of its signal starting shortly after the passage of the signal through its minimum value.
Claim 10
Dependent Claim
170 words
Apparatus for monitoring variations in a first frequency in relation to a second frequency, comprising: a generator means providing a first signal A at the first frequency; means for providing a second signal B identical to the first signal and in phase quadrature therewith; a first sawtooth signal source means connected to receive the first and second signals and to provide a first sawtooth signal wherein the total duration of four successive cycles is substantially equal to the period of the first signal and one cycle of the four is synchronized with the first quarter period of the first signal following a minimum value; a second sawtooth signal source means for providing a second sawtooth signal identical to the first sawtooth signal when the frequencies are synchronized; and phase shift measuring means connected to receive the first and second sawtooth signals and to provide an output signal indicative of their phase relation, whereby variations in this output signal reflect variations in the first frequency in relation to the second frequency.
Claim 11
Dependent Claim
170 words
Apparatus for monitoring variations in a first frequency in relation to a second frequency, comprising: a generator means providing a first signal A at the first frequency; means for providing a second signal B identical to the first signal and in phase quadrature therewith; a first sawtooth signal source means connected to receive the first and second signals and to provide a first sawtooth signal wherein the total duration of four successive cycles is substantially equal to the period of the first signal and one cycle of the four is synchronized with the first quarter period of the first signal following a minimum value; a second sawtooth signal source means for providing a second sawtooth signal identical to the first sawtooth signal when the frequencies are synchronized; and phase shift measuring means connected to receive the first and second sawtooth signals and to provide an output signal indicative of their phase relation, whereby variations in this output signal reflect variations in the first frequency in relation to the second frequency.
References Cited (Backward Citations)
US3505595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |