US3697759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of testing a strip material and apparatus therefor utilizing autocorrelation
Assignee: Agfa Gevaert NV
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Filing: 1971-07-28
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Granted: 1972-10-10
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Expires: 1991-07-28
Abstract
Abstract A method of testing a moving strip of material, wherein the density of the strip is measured at two successive places, the instant measurement signal obtained at the first place is multiplied by a factor which is proportional to the instant value of the measurement signal at the second place, and the average value of the resultant product signal is determined.
Inventors
- 👤 Etienne Marie De Cock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:03
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/64; G01P3/80; G01P3/806; G01N; G01N21/00; G01N21/84; G01N21/86; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/1928
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
Method of testing a moving strip material, wherein the density variations of the strip are detected by means of a first and a second photoelectric detector, the distanCe covered by the strip between the moment a point of the strip passes in front of one photoelectric detector and the moment the same point of the strip passes in front of the other photoelectric detector is varied, and the instant value of the output signal of the first photoelectric detector is multiplied by a factor which is proportional to the instant value of the output signal of the second photoelectric detector, whereupon the average value of the resultant product signal is determined.
Claim 2
Dependent Claim
111 words
Method of testing a moving strip material, wherein the density variations of the strip are detected by means of a first and a second photoelectric detector, the distanCe covered by the strip between the moment a point of the strip passes in front of one photoelectric detector and the moment the same point of the strip passes in front of the other photoelectric detector is varied, and the instant value of the output signal of the first photoelectric detector is multiplied by a factor which is proportional to the instant value of the output signal of the second photoelectric detector, whereupon the average value of the resultant product signal is determined.
Claim 3
Dependent Claim
141 words
Method of testing a moving strip material, wherein a. the density variations of the strip are detected by means of a first and a second photoelectric detector, the distance covered by the strip between the moment a point of the strip passes in front of one photoelectric detector and the moment the same point of the strip passes in front of the other photoelectric detector having a certain value, b. the instantaneous value of the output of the first photoelectric detector is multiplied by a factor which is proportional to the instantaneous value of the output of the second photoelectric detector, and c. the product signal is integrated during a predetermined time, what yields a point of a correlation curve, whereafter said distance is varied and the steps (b) and (c) are repeated to determine successive points of a correlation curve.
Claim 4
Dependent Claim
141 words
Method of testing a moving strip material, wherein a. the density variations of the strip are detected by means of a first and a second photoelectric detector, the distance covered by the strip between the moment a point of the strip passes in front of one photoelectric detector and the moment the same point of the strip passes in front of the other photoelectric detector having a certain value, b. the instantaneous value of the output of the first photoelectric detector is multiplied by a factor which is proportional to the instantaneous value of the output of the second photoelectric detector, and c. the product signal is integrated during a predetermined time, what yields a point of a correlation curve, whereafter said distance is varied and the steps (b) and (c) are repeated to determine successive points of a correlation curve.
Claim 5
Dependent Claim
19 words
Method of testing according to claim 2, wherein the time elapsing between successive variations of the distance is constant.
Claim 6
Dependent Claim
166 words
Method of testing according to claim 1, for the autocorrelation of a signal which is representative for density variations in a moving material strip, wherein the density variations of the strip are detected at a determined transverse distance from an edge of the strip by means of a first photoelectric detector, the density variations of the strip are detected by means of a second photoelectric detector which is situated at the same transverse distance from the edge of the strip as the first photoelectric detector, the distance covered by the strip between the moment a point of the strip passes in front of one photoelectric detector and the moment the said point passes in front of the other photoelectric detector is varied, and the instant value of the output signal of the first photoelectric detector is multiplied by a factor which is proportional to the instant value of the output signal of the second photoelectric detector whereupon the average value of resulting product signal is determined.
References Cited (Backward Citations)
AT211654B
Cited
US3620630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |