US3921060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
VHF-band pulse radiospectrometer for the study of nuclear quadrupole resonance in solid specimens
Assignee: United States Department of the Navy
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Filing: 1974-03-04
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Granted: 1975-11-18
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Expires: 1994-03-04
Abstract
Abstract A VHF-band pulse radiospectrometer for the study of nuclear quadrupole resonance in solid specimens, comprising a highfrequency pulse oscillator having an inductance coil adapted to accommodate the specimen being investigated and a superheterodyne receiver for signals of the signals of nuclear quadrupole resonance signals. An element for retuning the anode circuit of the pulse oscillator is coupled to an element for retuning a heterodyne or variable oscillator circuit via an automatic frequency retuning unit, one input thereof being connected to the output of the pulse oscillator and the other input to the variable oscillator output. The output of the automatic retuning unit is connected to an electric motor controlling the element for retuning the variable oscillator circuit. The retuning elements are variable capacitors. A feedback circuit of the pulse oscillator includes a variable reactance connected to the anode circuit of the pulse oscillator in such a manner that the value of this reactance is varied in accordance with the changing value of the retuning element of the anode circuit of the pulse oscillator.
Inventors
- 👤 Ivan Alexandrovich Ekimovskikh
- 👤 Boris Grigorievich Ignatov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:25
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/441
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
263 words
A VHF-band pulse radiospectrometer for the study of nuclear quadrupole resonance in solid specimens, comprising: a highfrequency pulse oscillator; a pulse unit connected to the input of said oscillator; and anode circuit in said oscillator; a retuning element for said anode circuit; an inductance coil for accommodating investigated solid specimens and being electrically connected to said oscillator; means for matching the resistance of said coil with that of said anode circuit, effecting electric coupling of said coil to said oscillator; a superheterodyne receiver for receiving nuclear quadrupole resonance signals of the investigated specimens; a mixer for said receiver, whose one input is connected to the output of said matching means; an IF amplifier in said receiver, the input thereof being connected to the output of said mixer; a variable-frequency oscillator with a circuit for said receiver, whose first output is connected to the other input of said mixer; a retuning element for said variable oscillator circuit; and automatic frequency retuning unit for said variable oscillator, one input thereof being connected to the output of said pulse oscillator, and the other input thereof being connected to the output of said variable oscillator; means for recording the resonance signals, whose input is connected to the output of said IF amplifier; an electric motor, electrically coupled to the output of said automatic frequency retuning unit and mechanically coupled to said element for retuning the variable oscillator circuit; drive means, mechanically coupled to said retuning element of the anode circuit; and controlled thermostatic means for lodging the investigated solid specimens; wherein said retuning elements are variable capacitors.
Claim 2
Dependent Claim
263 words
A VHF-band pulse radiospectrometer for the study of nuclear quadrupole resonance in solid specimens, comprising: a highfrequency pulse oscillator; a pulse unit connected to the input of said oscillator; and anode circuit in said oscillator; a retuning element for said anode circuit; an inductance coil for accommodating investigated solid specimens and being electrically connected to said oscillator; means for matching the resistance of said coil with that of said anode circuit, effecting electric coupling of said coil to said oscillator; a superheterodyne receiver for receiving nuclear quadrupole resonance signals of the investigated specimens; a mixer for said receiver, whose one input is connected to the output of said matching means; an IF amplifier in said receiver, the input thereof being connected to the output of said mixer; a variable-frequency oscillator with a circuit for said receiver, whose first output is connected to the other input of said mixer; a retuning element for said variable oscillator circuit; and automatic frequency retuning unit for said variable oscillator, one input thereof being connected to the output of said pulse oscillator, and the other input thereof being connected to the output of said variable oscillator; means for recording the resonance signals, whose input is connected to the output of said IF amplifier; an electric motor, electrically coupled to the output of said automatic frequency retuning unit and mechanically coupled to said element for retuning the variable oscillator circuit; drive means, mechanically coupled to said retuning element of the anode circuit; and controlled thermostatic means for lodging the investigated solid specimens; wherein said retuning elements are variable capacitors.
Claim 3
Dependent Claim
47 words
The pulse radiospectrometer as defined in claim 1, further comprising a feedback circuit in said high-frequency pulse oscillator; a variable reactance connected to said feedback circuit; and variable inductance coils in said anode circuit; and wherein said variable reactance is mechanically coupled to said variable inductance coils.
References Cited (Backward Citations)
US3474328A
Cited
US3808518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |