Jefferson Science Associates, LLC

Chris Cuevas

John E McKisson

Hai Dong

Andrew G Weisenberger

James F Maxwell

Wenze Xi

Christopher D Keith

A method to perform continuous-wave NMR measurements of nuclear magnetization at high magnetic fields, above 2.5 T, without analog down-mixing is described. An FPGA controls a digital clock pulse which is used to stimulate a resonant circuit and provide a reference signal. An algorithm determines the real portion of a resonant circuit signal near the Larmor frequency of the species of interest using only two measurements of the waveform per cycle. The FPGA automatically alters a variable capacitance to tune the resonant circuit to the Larmor frequency.

Digital Q-Meter for continuous-wave NMR

A field programmable gate array based multi-channel flash ADC unit combined with a high speed multi-lane data communications channel/Ethernet-like modular intercommunication providing a complete but easily expandable high-speed data acquisition system. This apparatus and method permits high-speed pulse-shape digitalization allowing position resolution imaging of particles having a range of energies and is scalable to achieve the efficient capture of coincident data from large electromagnetic detector arrays.

Method and apparatus to digitize pulse shapes from radiation detectors

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Yorktown, VA, United States of America

Chris Cuevas