Robert O James

Title: Innovations and Contributions of Robert O. James in Magnetic Permeability Measurement

Introduction: Robert O. James is a distinguished inventor based in Rochester, NY, with an impressive portfolio of 35 patents. His innovative work has notably advanced the field of magnetic measurement, particularly focusing on the characterization of materials through their magnetic properties.

Latest Patents: One of Robert O. James's latest patents focuses on a method and apparatus for measurement of the magnetic permeability of a material. This system comprises two electrical inductors, designed as primary and secondary concentric coils, which share a common magnetic core space. By applying a first AC voltage to the primary coil, a magnetic flux is generated in the core, which is proportional to the magnetic permeability of the material being tested. The magnetic flux then induces an AC voltage in the secondary coil, serving as an indicator of the apparent magnetic permeability of the sample.

The unique aspect of this invention is its method of correcting the apparent permeability for conductivity by introducing a second AC voltage and resistor in series with electrodes positioned within the material. When the sample is a magnetorheological fluid, the magnetic permeability can be determined based on the concentration of magnetic particles, allowing for back-calculation from the amplitude of the secondary voltage signal.

Another related patent further explores the measurement of magnetic permeability using similar coil arrangements, enhancing sensitivity and resolution by employing two identical sets of coils with the reference material and MR fluid sample positioned separately.

Career Highlights: Robert O. James has made significant contributions through his extensive career, working with renowned companies such as Eastman Kodak Company and Sterling Winthrop Inc. His efforts have not only led to a substantial number of patents but have also established him as a key player in the field of material measurement technologies.

Collaborations: Throughout his career, Robert has collaborated with distinguished professionals, including Lawrence A. Rowley and Ronald Myron Wexler. These collaborations have been instrumental in pushing the boundaries of innovation and developing cutting-edge technologies in magnetic measurement.

Conclusion: Robert O. James has cemented his legacy as an influential inventor through his 35 patents and groundbreaking work in measuring the magnetic permeability of materials. His inventions provide essential advancements that benefit various applications, especially in fields involving magnetorheological fluids, showcasing his dedication to innovation and excellence in research.