Interface system for NMR spectrometer and quadrature probe

Details Interface system for NMR spectrometer and quadrature probe Interface system for NMR spectrometer and quadrature probe

1985-08-05

1987-08-04

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324309, 333104, G01R 3320

Patent

active

046848959

ABSTRACT:
In a magnetic resonance imager or other spectrometer, an interface (D) selectively connects quadrature probe coils (E) with a transmitter (C) and with a receiver (F). The interface includes a first RF switch (10), such as a first PIN diode (12) which has a low radio frequency impedance state for passing transmitted radio frequency signals to the probe coils and a high radio frequency impedance state for blocking the passage of radio frequency signals to the probe coils. A quarter wave length cable (20) or the equivalent is connected between the probe coils to shift the phase of the radio frequency signals 90 degrees. A second radio frequency switch (40) includes a second quarter wave length cable (42) and a second pin diode (44) which selectively pass and block radio frequency signals from passing between the probe coils and the receiver. A third pin diode (52) selectively connects a third quarter wave length cable (54) with ground to provide a band pass filter in the transmit mode and causes the third quarter wave length cable to be connected to ground through a fourth quarter wave length cable (60) in the receive mode to provide a band stop filter. A control (G) selectively biases the PIN diodes between their conductive and non-conductive states to establish the transmit and receive modes.

REFERENCES:
patent: 3039048 (1962-06-01), Shoolery
patent: 4297637 (1981-10-01), Crooks
patent: 4408162 (1983-10-01), Egger
patent: 4452250 (1984-06-01), Chance et al.
patent: 4467282 (1984-08-01), Siebold
Moores et al., "VHF Pulsed Magnetic Resonance Duplexers", Review of Scientific Instruments, vol. 42, No. 9, Sep. 1971, pp. 1329-1333.
Kan et al., "A Versatile and Inexpensive Electronic System for a High Resolution NMR Spectrometer", Review of Scientific Instruments, vol. 44, No. 12, Dec. 1973, pp. 1725-1733.
"A Fast Recovery Pulsed Nuclear Magnetic Resonance Sample Probe Using a Delay Line", Lowe et al, Rev. Sci. Instr., vol. 45, No. 5, pp. 631-639, May 1974.
Quadrature Detection Coils-A Further .sqroot.2 Improvement in Sensitivity; Chen, Hoult & Sank, J. of Mag. Res. 54, pp. 324-327 (1983).

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