US3808518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulsed vhf radio spectrometer for investigation of nuclear quadrupole resonance in solids
Assignee: Individual
•
Filing: 1971-10-20
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Granted: 1974-04-30
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Expires: 1991-10-20
Abstract
Abstract A pulsed VHF radio spectrometer for the invenstigation of nuclear quadrupole resonance (NQR) in solids, in which the tuning arrangements of the anode and grid tanks in a double-tank r.f. pulse oscillator are kinematically linked to each other and to the tuning arrangement of the tuned circuit of a local oscillator by means of a drive having a programmer. The latter is made such that the grid tank in the r.f. pulse oscillator and the localoscillator tuned circuit are swept in frequency in a predetermined manner. The radio spectrometer disclosed herein has an inductance coil to enclose the solid test specimen, which is electrically connected to the r.f. pulse oscillator through a matching means which matches the impedance of the inductance coil to the impedance of the anode tank in the r.f. pulse oscillator. The circuit parameters of the matching means and the circuit parameters of the inductance coil determine the above-mentioned manner for frequency sweeping.
Inventors
- 👤 B Ignatov
- 👤 A Alexandrov
- 👤 B Pavlov
- 👤 A Sergeev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:28
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/441
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
359 words
A pulsed VHF radio spectrometer for the investigation of nuclear quadrupole resonance (NQR) in solid test specimen comprising: a double tank r.f. pulse oscillator including an anode tank of said r.f. pulse oscillator; a tuning arrangement for said anode tank; a grid tank of said r.f. pulse oscillator; a tuning arrangement for said grid tank; a pulser connected to the input of said r.f. pulse oscillator; an automatic frequency control (AFC) unit connected to one of the outputs of said r.f. pulse oscillator; a local oscillator having an input connected to said AFC unit and having two outputs, one of which is connected to said AFC unit; a tuned circuit for said local oscillator; a tuning arrangement for said local oscillator tuned circuit, a drive kinematically linked to said tuning arrangement of said anode tank; a programmer kinematically connected to said drive, to said tuning arrangement of said grid tank and to said tuning arrangement of said local oscillator and made so that said grid tank in said r.f. pulse oscillator and said local tuned circuit are swept in frequency in a predetermined manner as required for matching the tuning of said tanks of said pulse oscillator and local oscillator tuned circuit; an inductance coil enclosing the solid test specimen, electrically connected to said r.f. pulse oscillator; a matching means to match the impedance of said inductance coil to the impedance of said anode tank in said r.f. pulse oscillator, which effects said electrical connection between said inductance coil and said oscillator and the circuit parameters of which, together with the circuit parameters of said inductance coil determine the requisite manner of sweeping said grid tank in said r.f. pulse oscillator and said local oscillator tuned circuit in frequency for matching the tuning of the tanks of said oscillator and said local oscillator; a mixer connected to said matching means and to the second output of said local oscillator; means for the reception and registration of NQR signals carrying information about the physico-chemical propeRties of said solid test specimen, electrically connected to said mixer and to said pulser, and means for maintaining the temperature of said solid test specimen.
Claim 2
Dependent Claim
359 words
A pulsed VHF radio spectrometer for the investigation of nuclear quadrupole resonance (NQR) in solid test specimen comprising: a double tank r.f. pulse oscillator including an anode tank of said r.f. pulse oscillator; a tuning arrangement for said anode tank; a grid tank of said r.f. pulse oscillator; a tuning arrangement for said grid tank; a pulser connected to the input of said r.f. pulse oscillator; an automatic frequency control (AFC) unit connected to one of the outputs of said r.f. pulse oscillator; a local oscillator having an input connected to said AFC unit and having two outputs, one of which is connected to said AFC unit; a tuned circuit for said local oscillator; a tuning arrangement for said local oscillator tuned circuit, a drive kinematically linked to said tuning arrangement of said anode tank; a programmer kinematically connected to said drive, to said tuning arrangement of said grid tank and to said tuning arrangement of said local oscillator and made so that said grid tank in said r.f. pulse oscillator and said local tuned circuit are swept in frequency in a predetermined manner as required for matching the tuning of said tanks of said pulse oscillator and local oscillator tuned circuit; an inductance coil enclosing the solid test specimen, electrically connected to said r.f. pulse oscillator; a matching means to match the impedance of said inductance coil to the impedance of said anode tank in said r.f. pulse oscillator, which effects said electrical connection between said inductance coil and said oscillator and the circuit parameters of which, together with the circuit parameters of said inductance coil determine the requisite manner of sweeping said grid tank in said r.f. pulse oscillator and said local oscillator tuned circuit in frequency for matching the tuning of the tanks of said oscillator and said local oscillator; a mixer connected to said matching means and to the second output of said local oscillator; means for the reception and registration of NQR signals carrying information about the physico-chemical propeRties of said solid test specimen, electrically connected to said mixer and to said pulser, and means for maintaining the temperature of said solid test specimen.
Claim 3
Dependent Claim
80 words
A pulsed radio spectrometer as claimed in claim 1, said programmer being in the form of a cam mechanism having cams which are mounted on a common shaft in said drive, each said cam being profiled so that said grid tank in said r.f. pulse oscillator and said local oscillator tuned circuit are swept in frequency in the manner required to match the tuning of the grid tank of said pulse oscillator and the tuned circuit of said local oscillator.
Claim 4
Dependent Claim
61 words
A pulsed radio spectrometer, as in claim 1, in which said matching means to match the impedance of said inductance coil to the impedance of said anode tank in said r.f. pulse oscillator is in the form of two capacitors connected directly to said inductance coil, and long lines connecting said capacitors to said anode tank in saif r.f. pulse oscillator.
References Cited (Backward Citations)
US3515981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |