David F Doty

Title: David F Doty: Innovator in NMR Technology

Introduction

David F Doty is a notable inventor based in Columbia, SC (US). He has made significant contributions to the field of nuclear magnetic resonance (NMR) technology. With a total of 2 patents, Doty's work focuses on enhancing the performance and efficiency of NMR systems.

Latest Patents

One of Doty's latest patents is titled "Thermal buffering of cross-coils in high-power NMR decoupling." This invention involves a transverse RF saddle coil that is affixed in intimate thermal contact on one surface of a ceramic coil form made of high thermal conductivity. The probe is primarily designed for use with solid samples at high fields, where the axis of the coil form is not aligned with the main field. Additionally, an orthogonal RF coil is mounted in close thermal contact with the first saddle coil via a ceramic spacer. The cooling of the coil form is achieved through high-velocity gas flow, often associated with bearing exhaust gas from a high-speed sample spinner. The two coils are tuned to different RF frequencies, with circuits capable of supporting high RF currents. Furthermore, the RF coils may be magnetically compensated and expansion controlled, incorporating passive geometric compensation of magnetic susceptibility effects from a sample spinner stator. Novel coil mounting techniques, including metallurgical bonds to ceramics and capturing by dielectric clam-shells, are also disclosed.

Another significant patent by Doty is the "Strip-line-core transformer." This invention describes a broadband, high-power RF transformer created by winding a tapered strip-line transmission-line conductor and dielectric material through two parallel slots. These slots are formed axially and symmetrically spaced apart through a solid right cylinder of low-loss magnetic material. Low inductance strip lines are utilized as leads, and a thin sheet of high thermal conductivity material may be added to enhance heat flow without degrading RF properties. This design is particularly advantageous at frequencies ranging from 1 MHz to 1000 MHz, capable of handling pulse powers up to several kilowatts at impedances from 2 Ω to 75 Ω.

Career Highlights

David F Doty has established himself as a prominent figure in the field of NMR technology. His innovative patents reflect his commitment to advancing the capabilities of NMR systems.

Collaborations

Doty has collaborated with George Entzminger, Jr., contributing to the