Patent US3710938A successfully refreshed from Google Patents.
US3710938A
Expired / Lapsed
US
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Apparatus and method for measuring the rate of change of thickness of dielectric members
Assignee: OI Glass Inc
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Filing: 1971-11-29
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Granted: 1973-01-16
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Expires: 1991-11-29
Abstract
Abstract Apparatus for detecting the presence of relatively narrow, thin sections in the sidewall of glass containers and rejecting those containers which exhibit such narrow, thin sections. A radio frequency source coupled to a transmitting antenna positioned adjacent the container establishes a radio frequency field extending through the wall of the glass container. The wall of the container is moved relative to a receiving probe. The instantaneous magnitude of the field received by the probe provides an indication of the thickness of the container sidewall. The signal received is amplified and the first derivative of the voltage with respect to time is taken. The rate of change of the voltage is a direct indication of the change in thickness of successive sections of the container sidewall being gauged. Those containers which exhibit a rate of change of voltage with respect to time above a preset level are rejected as being defective.
Inventors
- 👤 G Scherf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:52
CPC Classifications
G; G01; G01B; G01B15/00; G01B15/02; B; B07; B07C; B07C5/00; B07C5/04; B07C5/12; B07C5/122; B07C5/128; G01B7/00; G01B7/02; G01B7/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
In combination with an apparatus for measuring the thickness of an article formed of a dielectric material of the type wherein an antenna is used to establish a radio frequency field outwardly in the direction of an article positioned adjacent thereto, wherein a probe is positioned extending into said field adjacent said article, and wherein the voltage induced in said probe is an index of the thickness of that portion of said article immediately in front of said probe, wherein the improvement comprises, means connected to said probe for generating a signal proportional to the rate of change of thickness of said article, and means connected to said signal generating means for discarding those articles which exhibit a rate of change of thickness, as indicated by said generated signal, greater than a preselected value.
Claim 2
Dependent Claim
134 words
In combination with an apparatus for measuring the thickness of an article formed of a dielectric material of the type wherein an antenna is used to establish a radio frequency field outwardly in the direction of an article positioned adjacent thereto, wherein a probe is positioned extending into said field adjacent said article, and wherein the voltage induced in said probe is an index of the thickness of that portion of said article immediately in front of said probe, wherein the improvement comprises, means connected to said probe for generating a signal proportional to the rate of change of thickness of said article, and means connected to said signal generating means for discarding those articles which exhibit a rate of change of thickness, as indicated by said generated signal, greater than a preselected value.
Claim 3
Dependent Claim
66 words
The improvement of claim 1, wherein said means for generating a signal proportional to the rate of change of thickness of said article comprises, an I-F amplifier connected to said probe, means connected to said I-F amplifier for multiplying the voltage output of said I-F amplifier, and means connected to said multiplying means for generating the first derivative with respect to time of said multiplied voltage.
Claim 4
Dependent Claim
80 words
The improvement of claim 2, wherein said means for multiplying the voltage output of said I-F amplifier comprises, an operational amplifier connected to the output terminal of said I-F amplifier, an input resistor interposed in circuit between said I-F amplifier output terminal and the input terminal to said operational amplifier, a feedback resistor connected in a feedback loop between the input and output terminal of said operational amplifier, and a noise suppression capacitor connected in parallel with said feedback resistor.
Claim 5
Dependent Claim
98 words
The improvement of claim 2, wherein said means for generating the first derivative with respect to time of said multiplied voltage comprises, an operational amplifier connected to said means for multiplying the voltage output of said I-F amplifier, an input resistor and a differentiating capacitor connected in series between said means for multiplying the voltage output of said I-F amplifier and the input of said operational amplifier, a feedback resistor connected in a feedback loop between the input terminal and output terminal of said operational amplifier, and a noise suppression capacitor connected in parallel with said feedback resistor.
Claim 6
Dependent Claim
60 words
The improvement of claim 2, further including means connected in circuit between said means for generating the first derivative with respect to time of said multiplied voltage and said means for discarding those articles which exhibit a rate of change of thickness greater than a preselected value for taking the absolute value of said first derivative with respect to time.
Claim 7
Dependent Claim
75 words
The apparatus of claim 1, wherein said means for discarding those articles which exhibit a rate of change of thickness greater than a preselected value comprises, means for generating an output signal when said rate of change of thickness, as indicated by said signal proportional to the rate of change of thickness of said article, exceeds a preselected value, and means responsive to said output signal for rejecting articles upon receipt of said output signal.
Claim 8
Dependent Claim
131 words
The improvement of claim 6, wherein said means for generating an output signal when said rate of change of thickness exceeds a pre-selected value comprises, an operational amplifier connected to said means for generating a signal proportional to the rate of change of thickness of said article, an input resistor interposed in circuit between said means for generating a signal proportional to the rate of change of thickness of said article and the input terminal of said operational amplifier, means connected to the input terminal of said operational amplifier for biasing said operAtional amplifier in a nonconducting mode, and a diode connected in a feedback loop from the input terminal to the output terminal of said operational amplifier for allowing current flow only from said output terminal to said input terminal.
Claim 9
Dependent Claim
83 words
The improvement of claim 7, wherein said means for biasing said operational amplifier comprises, a voltage source, a plurality of resistors of different values connected in parallel to said voltage source, a multiple pole switch connected to said plurality of resistors for selecting one of said resistors, and a potentiometer connected to the output terminal of said multiple pole switch and the input terminal of said operational amplifier, whereby a variable biasing voltage is provided at the input terminal of said operational amplifier.
Claim 10
Independent Claim
178 words
A method of sorting articles made from dielectric materials based on the rate of change of the thickness of such articles comprising the steps of: (a) establishing a radio frequency field in close proximity to a limited surface area of said article so that said field will pass into said article; (b) moving said article relative to said field to expose a selected surface area of said article to said field; (c) positioning a probe in the same plane as said field and centrally of said field such that a voltage will be induced in said probe indicative of the thickness of said article; (d) amplifying said induced voltage; (e) electronically producing the first derivative with respect to time of said induced voltage; (f) electronically comparing said first derivative with respect to time of said induced voltage with a preselected voltage level; and (g) rejecting those articles which exhibit a rate of change of thickness as represented by said first derivative with respect to time of said induced voltage greater than that represented by said preselected voltage level.
Claim 11
Independent Claim
178 words
A method of sorting articles made from dielectric materials based on the rate of change of the thickness of such articles comprising the steps of: (a) establishing a radio frequency field in close proximity to a limited surface area of said article so that said field will pass into said article; (b) moving said article relative to said field to expose a selected surface area of said article to said field; (c) positioning a probe in the same plane as said field and centrally of said field such that a voltage will be induced in said probe indicative of the thickness of said article; (d) amplifying said induced voltage; (e) electronically producing the first derivative with respect to time of said induced voltage; (f) electronically comparing said first derivative with respect to time of said induced voltage with a preselected voltage level; and (g) rejecting those articles which exhibit a rate of change of thickness as represented by said first derivative with respect to time of said induced voltage greater than that represented by said preselected voltage level.
Claim 12
Independent Claim
203 words
A method of sorting articles made from dielectric materials, based on the rate of change of thickness of such articles, comprising the steps of: a. establishing a radio frequency field in close proximity to a limited surface area of said article so that said field will pass into said article; b. moving said article relative to said field to expose a selected surface area of said article to said field; c. positioning a probe in the same plane as said field and centrally of said field such that a voltage will be induced in said probe indicative of the thickness of said article; d. amplifying said induced voltage; e. electronically producing the first derivative with respect to time of said induced voltage; f. electronically generating the absolute value of said first derivative with respect to time of said induced voltage; g. electronically comparing said absolute value of said first derivative with respect to time of said induced voltage with a preselected voltage level; and h. rejecting those articles which exhibit a rate of change of thickness as represented by said absolute value of said first derivative with respect to time of said induced voltage greater than that represented by said preselected voltage level.
Claim 13
Independent Claim
203 words
A method of sorting articles made from dielectric materials, based on the rate of change of thickness of such articles, comprising the steps of: a. establishing a radio frequency field in close proximity to a limited surface area of said article so that said field will pass into said article; b. moving said article relative to said field to expose a selected surface area of said article to said field; c. positioning a probe in the same plane as said field and centrally of said field such that a voltage will be induced in said probe indicative of the thickness of said article; d. amplifying said induced voltage; e. electronically producing the first derivative with respect to time of said induced voltage; f. electronically generating the absolute value of said first derivative with respect to time of said induced voltage; g. electronically comparing said absolute value of said first derivative with respect to time of said induced voltage with a preselected voltage level; and h. rejecting those articles which exhibit a rate of change of thickness as represented by said absolute value of said first derivative with respect to time of said induced voltage greater than that represented by said preselected voltage level.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |