US3586864A
Expired / Lapsed
US
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Apparatus and method for testing a body for surface irregularities
Assignee: VYZKUMNY USTAV STROJIRENSKE TECHNOLOGIE A EKONOMIKY
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Filing: 1968-11-06
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Granted: 1971-06-22
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Expires: 1988-11-06
Abstract
Abstract A light beam is sequentially directed to each part of the surface of a light reflective body and the reflected light beam is converted into an electrical signal corresponding in magnitude to the intensity of the reflected light beam. The electrical signal is stored and the electrical signal and the stored signal are compared in magnitude. A difference in magnitude of the signals indicates an irregularity in the surface of the body.
Inventors
- 👤 Jaroslav Brany
- 👤 Jiri Panek
- 👤 Stanislav Havel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:16
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
181 words
Apparatus for testing a rotating body having a light reflective surface for surface irregularities, comprising: scanning means comprising means for sequentially directing a light beam to the surface of said body for producing a beam of reflected light corresponding thereto and means for converting said reflected light beam into an electrical signal corresponding in magnitude to the intensity of said reflected light beam and means for dividing said signal into first and second electrical signals; signal storage means connected to said scanning means for storing said first electrical signal provided by said scanning means; and signal comparing means having an input connected to said second electrical signal from said scanning means and another input connected to said signal storage means for comparing said second electrical signaL provided by said scanning means and said first electrical signal stored by said signal storage means and providing an output signal corresponding to a difference in magnitude of the said first and second signals supplied thereto, a difference in magnitude of said first and second signals indicating an irregularity in the surface of said body.
Claim 2
Dependent Claim
181 words
Apparatus for testing a rotating body having a light reflective surface for surface irregularities, comprising: scanning means comprising means for sequentially directing a light beam to the surface of said body for producing a beam of reflected light corresponding thereto and means for converting said reflected light beam into an electrical signal corresponding in magnitude to the intensity of said reflected light beam and means for dividing said signal into first and second electrical signals; signal storage means connected to said scanning means for storing said first electrical signal provided by said scanning means; and signal comparing means having an input connected to said second electrical signal from said scanning means and another input connected to said signal storage means for comparing said second electrical signaL provided by said scanning means and said first electrical signal stored by said signal storage means and providing an output signal corresponding to a difference in magnitude of the said first and second signals supplied thereto, a difference in magnitude of said first and second signals indicating an irregularity in the surface of said body.
Claim 3
Dependent Claim
155 words
Apparatus for testing a rotating body having a light reflective surface for surface irregularities, comprising: scanning means for sequentially directing a light beam to the surface of a body having a light reflective surface and for converting the reflected light beam into an electrical signal corresponding in magnitude to the intensity of said reflected light beam; signal storage means connected to said scanning means for storing one of the average and maximum values of said electrical signal provided by said scanning means; and signal comparing means having an input connected to said scanning means and another input connected to said signal storage means for comparing the electrical signal provided by said scanning means and the electrical signal stored by said signal storage means and providing an output signal corresponding to a difference in magnitude of the signals supplied thereto, a difference in magnitude of said signals indicating an irregularity in the surface of said body.
Claim 4
Dependent Claim
155 words
Apparatus for testing a rotating body having a light reflective surface for surface irregularities, comprising: scanning means for sequentially directing a light beam to the surface of a body having a light reflective surface and for converting the reflected light beam into an electrical signal corresponding in magnitude to the intensity of said reflected light beam; signal storage means connected to said scanning means for storing one of the average and maximum values of said electrical signal provided by said scanning means; and signal comparing means having an input connected to said scanning means and another input connected to said signal storage means for comparing the electrical signal provided by said scanning means and the electrical signal stored by said signal storage means and providing an output signal corresponding to a difference in magnitude of the signals supplied thereto, a difference in magnitude of said signals indicating an irregularity in the surface of said body.
Claim 5
Dependent Claim
15 words
Apparatus as claimed in claim 2, wherein said signal comparing means comprises a differential amplifier.
Claim 6
Dependent Claim
35 words
Apparatus as claimed in claim 2, further comprising an amplifier connected between said scanning means and said signal storage means and said signal comparing means for amplifying the electrical signal provided by said scanning means.
Claim 7
Dependent Claim
46 words
Apparatus as claimed in claim 2, further comprising an amplifier connected to said scanning means and a phase inverter connected between said amplifier and said signal storage means and said signal comparing means for amplifying and phase inverting the electrical signal provided by said scanning means.
Claim 8
Dependent Claim
110 words
Apparatus as claimed in claim 2, wherein said signal storage means comprises a first signal storage circuit having an input connected to said scanning means and an output and a second signal storage circuit having an input connected to said scanning means and an output, and wherein said signal comparing means comprises a first differential amplifier having a first input connected to said scanning means and a second input connected to the output of said first signal storage circuit and a second differential amplifier having a first input connected to the output of said first storage circuit and a second input connected to the output of said second storage circuit.
Claim 9
Dependent Claim
49 words
Apparatus as claimed in claim 2, wherein said signal storage means comprises a storage capacitor having a plate connected to said scanning means and a potentiometer connected in parallel with said storage capacitor, said potentiometer having a movable contact connected to said other input of said signal comparing means.
Claim 10
Dependent Claim
68 words
Apparatus as claimed in claim 5, wherein said signal storage means comprises a storage capacitor having a plate connected to said phase inverter and a plurality of potentiometers connected in parallel with said storage capacitor, each of said potentiometers having a movable contact, and further comprising switch means for selectively connecting the movable contact of each of said potentiometers to said other input of said signal comparing means.
Claim 11
Dependent Claim
28 words
Apparatus as claimed in claim 6, wherein said first signal storage circuit has a short time constant and said second signal storage circuit has a long time constant.
Claim 12
Dependent Claim
32 words
Apparatus as claimed in claim 7, further comprising auxiliary charging means connected to said plate of the storage capacitor of said storage means for applying an auxiliary voltage to said storage capacitor.
Claim 13
Dependent Claim
32 words
Apparatus as claimed in claim 8, further comprising auxiliary charging means connected to said plate of the storage capacitor of said storage means for apPlying an auxiliary voltage to said storage capacitor.
Claim 14
Dependent Claim
45 words
Apparatus as claimed in claim 10, further comprising a diode interposed in the connection between said scanning means and said one input of said signal comparing means and a diode interposed in the connection between said scanning means and said plate of said storage capacitor.
Claim 15
Dependent Claim
45 words
Apparatus as claimed in claim 11, further comprising a diode interposed in the connection between said scanning means and said one input of said signal comparing means and a diode interposed in the connection between said scanning means and said plate of said storage capacitor.
Claim 16
Independent Claim
117 words
A method for testing a body having a light reflective surface for surface irregularities, comprising the steps of: sequentially directing a light beam to each part of the surface of a body having a light reflective surface and converting the reflected light beam into an electrical signal corresponding in magnitude to the intensity of the reflected light beam; dividing said electrical signal to first and second signals; storing said first signal; and subsequently comparing said second signal with said stored signal and providing an output signal correspond to a difference in magnitude of said first and second signals, a difference in magnitude of said first and second signals indicating an irregularity in the surface of said body.
Claim 17
Independent Claim
117 words
A method for testing a body having a light reflective surface for surface irregularities, comprising the steps of: sequentially directing a light beam to each part of the surface of a body having a light reflective surface and converting the reflected light beam into an electrical signal corresponding in magnitude to the intensity of the reflected light beam; dividing said electrical signal to first and second signals; storing said first signal; and subsequently comparing said second signal with said stored signal and providing an output signal correspond to a difference in magnitude of said first and second signals, a difference in magnitude of said first and second signals indicating an irregularity in the surface of said body.
Claim 18
Dependent Claim
17 words
A method as claimed in claim 14, wherein the average value of the electrical signal is stored.
Claim 19
Dependent Claim
17 words
A method as claimed in claim 14, wherein the maximum value of the electrical signal is stored.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |