US3761182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring the diameter of a circularly shaped object and correcting measurement for slight displacements of object along either of two orthogonal optic axes
Assignee: EXATEST Messtechnik GmbH
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Filing: 1972-06-01
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Granted: 1973-09-25
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Expires: 1992-06-01
Abstract
Abstract The disclosed invention involves periodically passing by using an optical scanning device, the profile image of the circular object to be measured before a photodetector which delivers pulses. The duration of each pulse is proportional to the diameter of the object. The improved invention corrects the diameter signal by a position signal giving the variation of the distance between the object and the optical scanning device. The apparatus for implementing such an improved method of measurement mainly comprises two scanning devices, the optical axes of which are orthogonally disposed with respect to each other and with respect to the longitudinal axis of the object, and a correction device is associated with each scanning device for correcting the diameter signal provided by the other scanning device.
Inventors
- 👤 H Kubisiak
- 👤 D Sorgenicht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:22
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/08; G01B11/10; G01B11/105; B; B07; B07C; B07C5/00; B07C5/04; B07C5/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
A method for measuring the diameter of an object having a circular cross-section comprsing the steps of: simultaneously generating a first electrical signal and duration of which is proportional to the length of one diameter of said object and a second electrical signal the duration of which is proportional to the length of a second diameter of said object orthogonally disposed with respect to the first diameter, simultaneously generating third and fourth electrical signals for defining the position of said object along said first and second diameters, respectively, with respect to a reference position on each diameter, and processing, on the one hand, said first and fourth electrical signals to obtain a value of said first diAmeter corrected according to the position of said object along said second diameter and, on the other hand, said second and third electrical signals to obtain a value of said second diameter corrected according to the position of said object along said first diameter.
Claim 2
Independent Claim
160 words
A method for measuring the diameter of an object having a circular cross-section comprsing the steps of: simultaneously generating a first electrical signal and duration of which is proportional to the length of one diameter of said object and a second electrical signal the duration of which is proportional to the length of a second diameter of said object orthogonally disposed with respect to the first diameter, simultaneously generating third and fourth electrical signals for defining the position of said object along said first and second diameters, respectively, with respect to a reference position on each diameter, and processing, on the one hand, said first and fourth electrical signals to obtain a value of said first diAmeter corrected according to the position of said object along said second diameter and, on the other hand, said second and third electrical signals to obtain a value of said second diameter corrected according to the position of said object along said first diameter.
Claim 3
Independent Claim
135 words
An apparatus for measuring the diameter of an object having a circular cross-section comprising identical first and second means orthogonally disposed with each other and with respect to the axis of said object for photoelectrically scanning said object along two orthogonally disposed diameters to detect the transition from non-illumination to illumination whereby obtaining first and second electrical signals respectively the durations of which are proportional to the two orthogonally disposed diameters of said object, identical third and fourth means associated with said first and second means respectively for generating third and fourth electrical signals respectively defining the position of said object along the two orthogonally disposed diameters with respect to a reference point, fifth means for processing said first, second, third and fourth electrical signals to obtain corrected values of the two orthogonally disposed diameters.
Claim 4
Independent Claim
135 words
An apparatus for measuring the diameter of an object having a circular cross-section comprising identical first and second means orthogonally disposed with each other and with respect to the axis of said object for photoelectrically scanning said object along two orthogonally disposed diameters to detect the transition from non-illumination to illumination whereby obtaining first and second electrical signals respectively the durations of which are proportional to the two orthogonally disposed diameters of said object, identical third and fourth means associated with said first and second means respectively for generating third and fourth electrical signals respectively defining the position of said object along the two orthogonally disposed diameters with respect to a reference point, fifth means for processing said first, second, third and fourth electrical signals to obtain corrected values of the two orthogonally disposed diameters.
Claim 5
Dependent Claim
58 words
An apparatus as claimed in claim 2 wherein said identical first and second means each comprises a light source positioned on one side of said object, a photomultiplier device, optical means positioned on the other side of said object for generating a scanning beam from said light source and for sequentially directing said beam to said photomultiplier device.
Claim 6
Dependent Claim
123 words
An apparatus as claimed in claim 2 wherein said identical first and second means each comprises a first light source positioned on one side of said object, a photomultiplier device, a rotating mirror positioned on the other side of said object, a lens positioned between said object and said rotating mirror to form an image of said object on the cathode of said photomultiplier device, and wherein said identical third and fourth means each comprises, a photodetector device, a second light source for directing a light beam to said photodetector device by means of said rotating mirror, said light beam being in the same plane as the object beam, and electronic circuits for combining electrical signals provided by said photomultiplier and photodetector devices.
Claim 7
Dependent Claim
99 words
An apparatus as claimed in claim 2 wherein said fifth means comprises first and second correction circuits for correcting said first and second electrical signals as a function of the values of said fourth and third electrical signals respectively by solving the correction equation xcorr x + or - (xy/a -x2/2a) in which xcorr is the corrected value of the diameter, x is the measured value of the diameter, a is the distance between the object and the lens, and y is the distance between the reference point and the edge of the object away from said reference point.
Claim 8
Dependent Claim
118 words
An apparatus as claimed in claim 2 wherein said fifth means comprises an electronic circuit providing an electrical signal proportional to the standard value of the diameter, first and second correction circuits for correcting said electrical signal proportional to the standard value of the diameter as a function of said fourth and third electrical signals respectively, whereby each correction circuit provides an electrical signal proportional to the corrected standard value of the diameter, first and second comparator circuits for comparing said electrical signal proportional to the corrected standard value of said first and second electrical signals respectively, and first and second display circuits for displaying the deviations of the measured diameter with respect to the corrected standard value.
Claim 9
Dependent Claim
187 words
An apparatus as claimed in claim 2 wherein said fifth means comprises an electronic circuit providing an electrical signal proportional to the standard value of the diameter, first and seconD correction circuits for correcting said electrical signal proportional to the standard value of the diameter as a function of said fourth and third electrical signals respectively, each correction circuit comprising an amplifier circuit receiving said electrical signal defining the position of said object, a gate circuit for providing a position signal shortened by a constant amount, a multiplying circuit for providing an electrical signal having an amplitude proportional to the standard value of the diameter and a duration equal to the shortened position signal, an integrator-divider circuit providing a signal proportional to the area of the output signal of the multiplying circuit, a squaring circuit providing a signal proportional to the square of the standard diameter, a difference stage calculating the difference between the output signals of said integrator-divider circuit and said squaring circuit, and a summation circuit calculating the sum of the signal proportional to the standard diameter and the output signal of said difference stage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |