Patent US3715667A successfully refreshed from Google Patents.
US3715667A
Expired / Lapsed
US
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Non-destructive electromagnetic energy testing of web material
Assignee: Unisys Corp
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Filing: 1971-10-04
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Granted: 1973-02-06
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Expires: 1991-10-04
Abstract
Abstract The forward or back scattered high frequency energy from a moving web of dielectric material exposed to incident impulses of base band duration electromagnetic energy in a parallel plate transmission line is continuously monitored by a signal sampling and comparison system for providing defect-stimulated alarm or control signals.
Inventors
- 👤 A Nicolson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:20
CPC Classifications
G; G01; G01N; G01N22/00; G01N22/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
152 words
High frequency apparatus for monitoring the intrinsic dielectric properties of a moving web of material comprising: transmission line means for propagating base band electromagnetic pulses in the transverse electromagnetic propagation mode having first and second spaced, substantially parallel conductors, means for passing said web of material between said conductors substantially perpendicular to the direction of electromagnetic energy propagation therein, base band pulse generator means for exciting said transmission line means, matched transmission line termination means, sampling means connected in series relation between said base band pulse generator means and said matched transmission line termination means and responsive to energy scattered by said web to form a signal representative of said scattered energy, means for comparing said signal representative of said scattered energy to a reference signal for forming an output signal upon the departure of the level of scattered energy from a normal value, and utilization means responsive to said comparing means.
Claim 2
Dependent Claim
152 words
High frequency apparatus for monitoring the intrinsic dielectric properties of a moving web of material comprising: transmission line means for propagating base band electromagnetic pulses in the transverse electromagnetic propagation mode having first and second spaced, substantially parallel conductors, means for passing said web of material between said conductors substantially perpendicular to the direction of electromagnetic energy propagation therein, base band pulse generator means for exciting said transmission line means, matched transmission line termination means, sampling means connected in series relation between said base band pulse generator means and said matched transmission line termination means and responsive to energy scattered by said web to form a signal representative of said scattered energy, means for comparing said signal representative of said scattered energy to a reference signal for forming an output signal upon the departure of the level of scattered energy from a normal value, and utilization means responsive to said comparing means.
Claim 3
Dependent Claim
152 words
High frequency apparatus for monitoring the intrinsic dielectric properties of a moving web of material comprising: transmission line means for propagating base band electromagnetic pulses in the transverse electromagnetic propagation mode having first and second spaced, substantially parallel conductors, means for passing said web of material between said conductors substantially perpendicular to the direction of electromagnetic energy propagation therein, base band pulse generator means for exciting said transmission line means, matched transmission line termination means, sampling means connected in series relation between said base band pulse generator means and said matched transmission line termination means and responsive to energy scattered by said web to form a signal representative of said scattered energy, means for comparing said signal representative of said scattered energy to a reference signal for forming an output signal upon the departure of the level of scattered energy from a normal value, and utilization means responsive to said comparing means.
Claim 4
Dependent Claim
152 words
High frequency apparatus for monitoring the intrinsic dielectric properties of a moving web of material comprising: transmission line means for propagating base band electromagnetic pulses in the transverse electromagnetic propagation mode having first and second spaced, substantially parallel conductors, means for passing said web of material between said conductors substantially perpendicular to the direction of electromagnetic energy propagation therein, base band pulse generator means for exciting said transmission line means, matched transmission line termination means, sampling means connected in series relation between said base band pulse generator means and said matched transmission line termination means and responsive to energy scattered by said web to form a signal representative of said scattered energy, means for comparing said signal representative of said scattered energy to a reference signal for forming an output signal upon the departure of the level of scattered energy from a normal value, and utilization means responsive to said comparing means.
Claim 5
Dependent Claim
45 words
Apparatus as described in claim 1 wherein said first conductor comprises strip transmission line means having a first surface with a first transverse dimension and said second conductor comprises ground plane means having a second surface with a transverse dimension greater than said first dimension.
Claim 6
Dependent Claim
28 words
Apparatus as described in claim 2 wherein said first and second surfaces are generally conformal, and said web is passed between said surfaces in substantial conformal relation therewith.
Claim 7
Dependent Claim
14 words
Apparatus as described in claim 3 wherein said first and second surfaces are arcuate.
Claim 8
Dependent Claim
24 words
Apparatus as described in claim 4 wherein said second surface comprises the surface of a drum rotatable synchronously with the motion of said web.
Claim 9
Dependent Claim
21 words
Apparatus as described in claim 1 additionally comprising means for operating said sampling means in synchronism with said pulse generator means.
Claim 10
Dependent Claim
20 words
Apparatus as described in claim 6 additionally including threshold means serially connected between said comparing means and said utilization means.
Claim 11
Dependent Claim
13 words
Apparatus as described in claim 2 wherein said utilization means comprises alarm means.
Claim 12
Dependent Claim
31 words
Apparatus as described in claim 2 wherein said utilization means comprises means for demarking defective web material upon the departure of the level of said scattered energy from a normal value.
Claim 13
Dependent Claim
34 words
Apparatus as described in claim 1 additionally including reference signal source means comprising transmission line means for propagating base band electromagnetic pulses in the transverse electromagnetic mode and having first and second spaced conductors.
Claim 14
Dependent Claim
25 words
Apparatus as described in claim 10 wherein said reference signal source transmission line means is adapted fixedly to support a reference sample of said web.
Claim 15
Dependent Claim
23 words
Apparatus as described in claim 11 wherein said base band pulse generator is adapted to excite said reference signal source transmission line means.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |