Patent US3629700A successfully refreshed from Google Patents.
US3629700A
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Capacitance and dissipation factor measuring apparatus having coherent detectors
Assignee: Individual
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Filing: 1969-09-16
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Granted: 1971-12-21
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Expires: 1989-09-16
Abstract
Abstract A dielectric meter for measuring electrical characteristics of a dielectric sample having resistive and capacitive components in which a variable-frequency oscillator has a sine wave output coupled through an integrator with a 1-watt transfer characteristic into a sample; the output of the sample being coupled through an operational amplifier to the input of a first coherent detector and through a limiter to the input of a second coherent detector; the first coherent detector having a reference input comprising an inphase square wave signal from the variablefrequency oscillator and the second coherent detector having a reference input comprising a quadrature square wave signal output coupled from the variable-frequency oscillator; the output of the first coherent detector having an amplitude directly proportional to the capacitor component of the sample and the output of the second coherent detector being passed through a tangent function generator yielding a loss tangent dissipation factor.
Inventors
- 👤 Stanley A Yalof
- 👤 Lawrence Van Doren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:07
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2688; G01R27/2694; G01N; G01N27/00; G01N27/02; G01N27/22; G01N27/223
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A dielectrometer for measuring electrical characteristics of a dielectric sample comprising: a signal generator having a sine-wave output and a square wave output 90* removed in phase from said sine-wave output; a dielectric sample having an input coupled to said sine-wave output; limiting means, said limiting means having an input coupled to an output from said dielectric sample; a coherent detector, said square wave output coupled to a reference input of said coherent detector and a signal input of said coherent detector coupled to an output of said limiter; and tangent function generator means having an input coupled to an output of said coherent detector whereby an output from said tangent function generating means yields the dissipation factor of said dielectric sample.
Claim 2
Dependent Claim
122 words
A dielectrometer for measuring electrical characteristics of a dielectric sample comprising: a signal generator having a sine-wave output and a square wave output 90* removed in phase from said sine-wave output; a dielectric sample having an input coupled to said sine-wave output; limiting means, said limiting means having an input coupled to an output from said dielectric sample; a coherent detector, said square wave output coupled to a reference input of said coherent detector and a signal input of said coherent detector coupled to an output of said limiter; and tangent function generator means having an input coupled to an output of said coherent detector whereby an output from said tangent function generating means yields the dissipation factor of said dielectric sample.
Claim 3
Dependent Claim
28 words
The dielectrometer of claim 1 wherein: said signal generator comprises a variable-frequency oscillator and further includes integrating means coupled between said sine-wave output and said dieletric sample input.
Claim 4
Dependent Claim
67 words
The dielectrometer of claim 2 and further including: a second square wave output of said signal-generating means in phase with said sine-wave output; and a second coherent detector having a reference input coupled to said second square wave output and a signal input coupled to an output of said dielectric sample whereby an output from said second coherent detector yields the capacitive component of said dielectric sample.
Claim 5
Dependent Claim
33 words
The dielectrometer of claim 1 and further including: integrating means coupled between said sine-wave output and said dielectric sample; and an operational amplifier coupled between said dielectric sample output and said limiting means.
Claim 6
Dependent Claim
109 words
A dielectrometer for measuring electrical characteristics of a dielectric sample comprising: a dielectric sample having an input and an output; a signal-generating means having a signal output coupled to said dielectric sample input; a coherent detector having a signal input and a reference input; coupling means coupling the output of said dielectric sample to said signal input; and said signal-generating means operable for generating a reference signal of the same frequency and predeterminedly related in phase to said signal output, said reference signal being coupled to said coherent detector reference input whereby the output of the coherent detector is the arctangent of the dissipation factor of the dielectric sample.
Claim 7
Dependent Claim
109 words
A dielectrometer for measuring electrical characteristics of a dielectric sample comprising: a dielectric sample having an input and an output; a signal-generating means having a signal output coupled to said dielectric sample input; a coherent detector having a signal input and a reference input; coupling means coupling the output of said dielectric sample to said signal input; and said signal-generating means operable for generating a reference signal of the same frequency and predeterminedly related in phase to said signal output, said reference signal being coupled to said coherent detector reference input whereby the output of the coherent detector is the arctangent of the dissipation factor of the dielectric sample.
References Cited (Backward Citations)
US3026474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |