Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Reexamination Certificate
2006-09-19
2006-09-19
Shrivastav, Brij B. (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
C324S318000
Reexamination Certificate
active
07109714
ABSTRACT:
A probe (80) for irradiating a sample with RF energy during transmitting periods and detecting an NQR or NMR signal from a substance contained within the sample during receiving periods. The probe (80) comprises a variable impedance unit (20) for changing the Q-factor of the probe and a probe coil. The probe (80) is responsive to powerful RF pulses applied thereto to excite an RF magnetic field in the probe coil during the transmitting periods. The variable impedance unit (20) is controllable to provide a Q-factor for the probe (80) at:(i) an optimal level during a prescribed transmitting period of an RF pulse for irradiating the sample with said RF energy;(ii) a minimal level during a prescribed recovery period immediately following said transmitting period to rapidly dampen transient signals from the probe; and(iii) a maximal level during a prescribed receiving period for detecting an NQR or NMR signal from the target substance if present, immediately following the recovery period.A method for detecting an NQR or NMR signal within a sample using the probe (80) is also described.
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Roeder et al., “A Single-Coil Probe Damper for Pulsed Nuclear Magnetic Resonance”, The Review of Scientific Instruments, vol. 42, No. 11, Nov. 1971, pp. 1692-1693.
Floridi et al., “Fast-Recovery Crossed-Coil Probe for Low Frequency Solid-State NMR”, Measurement Science and Technology, vol. 2, 1991, pp. 934-937.
Stokes, “Tuned Limiter for Receiver Amplifier in a Fast-Recovery Pulsed NMR Spectrometer”, The Review of Scientific Instruments, vol. 49, No. 7, 1978, pp. 1011-1012.
Hirschfeld, “Short Range Remote NQR Measurements”, Journal of Molecular Structure, vol. 58, 1980, pp. 63-77.
Hoult, “Fast Recovery With a Conventional Probe”, Journal of Magnetic Resonance, vol. 57, 1984, pp. 394-403.
Andrew et al., “NMR Probe With Short Recovery Time”, Journal of Magnetic Resonance, vol. 73, 1987, pp. 268-276.
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Conradi, “FET Q Switch for Pulsed NMR”, The Review of Scientific Instruments, vol. 48, No. 3, Mar. 1977, pp. 359-361.
Kisman et al., “Coupling Scheme and Probe Damper for Pulsed Nuclear Magnetic Resonance Single Coil Probe”, The Review of Scientific Instruments, vol. 45, No. 9, Sep. 1974, pp. 1159-1163.
Hoult, “Fast Recovery, High Sensitivity NMR Probe and Preamplifier for Low Frequencies”, The Review of Scientific Instruments, vol. 50, No. (2), Feb. 1979, pp. 193-200.
Rudakov et al., “Damping of Transients in an Excited Circuit of an NQR Spectrometer”, Instruments and Experimental Techniques, vol. 38, No. 6, Part 1, 1995, pp. 744-745.
Suits et al., “Super-Q Detection of Transient Magnetic Resonance Signals”, Journal of Magnetic Resonance, vol. 132, 1998, pp. 54-64.
Samuelson et al., “Self-Switching Damping Circuit for Reducing Transmitter Ringdowm Time in High Power Pulse NMR”, The Review of Scientific Instruments, vol. 41, No. 11, Nov. 1970, pp. 1601-1603.
Decorps et al., “An Inductively Coupled, Series-Tuned NMR Probe”, Journal of Magnetic Resonance, vol. 65, 1985, pp. 100-109.
Roeder et al., “A Single-Coil Probe Damper for Pulsed Nuclear Magnetic Resonance”, The Review of Scientific Instruments, vol. 42, No. 11, Nov. 1971, pp. 1692-1693.
Floridi et al., “Fast-Recovery Crossed-Coil Probe for Low Frequency Solid-State NMR”, Measurement Science and Technology, vol. 2, 1991, pp. 934-937.
Stokes, “Tuned Limiter for Receiver Amplifier in a Fast-Recovery Pulsed NMR Spectrometer”, The Review of Scientific Instruments, vol. 49, No. 7, 1978, pp. 1011-1012.
Hirschfeld, “Short Range Remote NQR Measurements”, Journal of Molecular Structure, vol. 58, 1980, pp. 63-77.
Hoult, “Fast Recovery With a Convential Probe”, Journal of Magnetic Resonance, vol. 57, 1984, pp. 394-403.
Andrew et al., “NMR Probe with Short Recovery Time”, Journal of Magnetic Resonance, vol. 73, 1987, pp. 268-276.
Chisholm Warrick Paul
Flexman John Harold
Hayes Peter Alaric
Mikhaltsevitch Vassili Timofeevitch
Rudakov Taras Nikolaevitch
Bednarek Michael
Pillsbury Winthrop Shaw & Pittman LLP
Qrsciences Pty. Ltd.
Shrivastav Brij B.
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