US3574292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interferometer motion and velocity controller
Assignee: Doall Co
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Filing: 1969-08-21
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Granted: 1971-04-13
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Expires: 1989-08-21
Abstract
Abstract An interferometer measuring system which constitutes means of measuring the magnitude and velocity of relative motion between two parts along a defined path, coacts with numerical command reference data to effect and control relative motion between the parts produced by drive means which may be incapable of dimensional or velocity predictability.
Inventors
- 👤 Gene A Butts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:42
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/21; G05B19/23; G05B19/231; G05B19/232; G05B2219/00; G05B2219/30; G05B2219/36; G05B2219/36534; G05B2219/37; G05B2219/37275; G05B2219/37313; G05B2219/41; G05B2219/41301; G05B2219/43; G05B2219/43179; G05B2219/43194
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
A system for controlling the distance between first and second devices which are relatively movable along a defined path, comprising: A. reversible motor means operatively connected with at least one of said devices to produce relative motion between the two devices; B. means for directing monochromatic light toward said second device; C. means mounted on said second device for reflecting the light thus received at the second device toward said first device; D. means using the reflected light to generate an optical interference pattern consisting of a progression of interference fringes indicative of relative motion between said first and second devices; E. counter means to count the progressing interference fringes and in consequence of such count provide a digital representation proportional to the integral of said relative motion and indicative of the total change in relative distance between the two devices; F. means for receiving a digital command signal indicative of the desired change in relative distance between the two devices; G. comparator means for comparing said digital representation with said digital command signal to provide a position control signal; and H. means responsive to said position control signal for automatically effecting and governing the operation of said motor means.
Claim 2
Independent Claim
200 words
A system for controlling the distance between first and second devices which are relatively movable along a defined path, comprising: A. reversible motor means operatively connected with at least one of said devices to produce relative motion between the two devices; B. means for directing monochromatic light toward said second device; C. means mounted on said second device for reflecting the light thus received at the second device toward said first device; D. means using the reflected light to generate an optical interference pattern consisting of a progression of interference fringes indicative of relative motion between said first and second devices; E. counter means to count the progressing interference fringes and in consequence of such count provide a digital representation proportional to the integral of said relative motion and indicative of the total change in relative distance between the two devices; F. means for receiving a digital command signal indicative of the desired change in relative distance between the two devices; G. comparator means for comparing said digital representation with said digital command signal to provide a position control signal; and H. means responsive to said position control signal for automatically effecting and governing the operation of said motor means.
Claim 3
Dependent Claim
31 words
A system according to claim 1 wherein said position control signal governs the operation of said motor means by starting and stopping the same and controlling the direction of its operation.
Claim 4
Dependent Claim
103 words
A system according to claim 2 further comprising: A. means for generating a second digital representation proportional to the rate of progression of said interference fringes and indicative of the rate of change in relative distance between the two devices; B. means for receiving a second digital command signal indicative of the desired rate of change in relative distance between the two devices; C. second comparator means for comparing said second digital representation with said second digital command signal to provide a velocity control signal; and D. means responsive to said velocity control signal for automatically controlling the speed of said motor means.
Claim 5
Dependent Claim
65 words
A system according to claim 3 further comprising: means for comparing said second digital representation with a digital deceleration reference signal to generate an overriding deceleration signal for governing the operation of the motor means and for decelerating the speed of the motor means at a rate not in excess of the response time of the motor means, whereby relative motion is stopped without hunting.
Claim 6
Dependent Claim
49 words
A system according to claim 17 wherein said reversible motor means comprises an infinitely variable fluid pressure responsive motor, and wherein said means for automatically effecting and controlling said motor means includes a servo valve through which said fluid pressure responsive motor is connected with a source of pressure.
References Cited (Backward Citations)
US2604004A
Cited
US2794424A
Cited
US3086151A
Cited
US3127465A
Cited
US3377111A
Cited
US3488123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |