US3670243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Physical displacement measuring system utilizing impedance changing the frequency of an oscillatory circuit
Assignee: Federal Products Corp
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Filing: 1970-02-27
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Granted: 1972-06-13
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Expires: 1990-02-27
Abstract
Abstract An analog data transmission system having as the transmitting means an oscillator with a tuned circuit and means to vary the tuning of this circuit by an incremental value by a switching means operating repetitively, the entire system including a receiving means having a frequency discriminator followed by a voltage sensitive readout device which measures the difference between the two alternate frequencies of the oscillator caused by the switching.
Inventors
- 👤 Guy L Fougere
- 👤 John L Rothery
- 👤 Raymond H Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:50
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
161 words
A measuring system comprising two impedance elements, a variable transducer impedance element whose impedance is substantially smaller compared to the impedance of the remaining two elements, a measurement probe, means coupling said probe to the transducer impedance element to vary the impedance thereof, a transmitting oscillator having a frequency determining circuit including said two impedance elements, said oscillator including an output, switch means, means repetitively operating said switch means, said switch means alternately coupling and decoupling said transducer impedance element and said frequency determining circuit to change the frequency of the output of said oscillator by alternately switching said transducer impedance element into said frequency determining circuit, and receiving means coupled to the output of said oscillator means, said receiving means having a frequency discriminator the alternating current output of which is linearly proportional to the difference between the two alternate frequencies of said oscillator, a voltage sensitive readout device, and means coupling said voltage sensitive device to said frequency discriminator.
Claim 2
Dependent Claim
161 words
A measuring system comprising two impedance elements, a variable transducer impedance element whose impedance is substantially smaller compared to the impedance of the remaining two elements, a measurement probe, means coupling said probe to the transducer impedance element to vary the impedance thereof, a transmitting oscillator having a frequency determining circuit including said two impedance elements, said oscillator including an output, switch means, means repetitively operating said switch means, said switch means alternately coupling and decoupling said transducer impedance element and said frequency determining circuit to change the frequency of the output of said oscillator by alternately switching said transducer impedance element into said frequency determining circuit, and receiving means coupled to the output of said oscillator means, said receiving means having a frequency discriminator the alternating current output of which is linearly proportional to the difference between the two alternate frequencies of said oscillator, a voltage sensitive readout device, and means coupling said voltage sensitive device to said frequency discriminator.
Claim 3
Dependent Claim
36 words
A measuring system as in claim 1 wherein said receiving means is a wireless receiving means and includes a peak clipper ahead of said frequency discriminator, the output of the clipper connected to the frequency discriminator.
Claim 4
Dependent Claim
154 words
A measuring system for detecting a physical displacement comprising an oscillator including a frequency determining circuit having impedance elements, a transducer, a measurement probe, the transducer having two impedance means, means coupling the impedance means for varying the impedances inversely with respect to each other, said coupling means including a mechanical connection to said probe, each of said transducer impedance means having a magnitude that is substantially smaller compared to the magnitude of the individual impedance elements in the frequency determining circuit, a switch, means repetitively operating said switch, the impedance means of said transducer being connected alternately to said oscillator frequency determining circuit through said switch whereby the frequency of said oscillator is varied periodically by switching the impedance means, and frequency discriminator means coupled to the output of said oscillator, said frequency discriminator means producing an alternating current output signal proportional to the difference between the two alternate frequencies of said oscillator.
Claim 5
Dependent Claim
154 words
A measuring system for detecting a physical displacement comprising an oscillator including a frequency determining circuit having impedance elements, a transducer, a measurement probe, the transducer having two impedance means, means coupling the impedance means for varying the impedances inversely with respect to each other, said coupling means including a mechanical connection to said probe, each of said transducer impedance means having a magnitude that is substantially smaller compared to the magnitude of the individual impedance elements in the frequency determining circuit, a switch, means repetitively operating said switch, the impedance means of said transducer being connected alternately to said oscillator frequency determining circuit through said switch whereby the frequency of said oscillator is varied periodically by switching the impedance means, and frequency discriminator means coupled to the output of said oscillator, said frequency discriminator means producing an alternating current output signal proportional to the difference between the two alternate frequencies of said oscillator.
References Cited (Backward Citations)
US2747095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |