Introduction: Charles R Christensen is a notable inventor based in Athens, Alabama. He has made significant contributions to the field of semiconductor materials and optical testing. With a total of six patents to his name, Christensen's work has advanced the understanding and measurement of free carrier concentration and effective mass in semiconductors.

Latest Patents: One of his latest patents is a device and method for performing an optical Hall test. This innovation provides a means for non-destructive measurement of free carrier concentration or effective mass in semiconductor materials using Faraday rotation spectra. The device utilizes a beam emitted by a Fourier transform infrared (FTIR) spectrometer, which is transmitted through a sample mounted between a polarizer and analyzer, and the opposite poles of a magnet before being detected. The resulting data allows for the determination of carrier concentration and effective mass through a mathematical conversion of the transmission spectrum.

Another significant patent is the modulated high sensitivity infrared polarimeter. This invention produces a modulated Faraday rotation signal by passing a linearly polarized laser beam through a semiconductor wafer sample in a modulated magnetic field. The rotation signal is normalized to achieve high signal-to-noise ratios and compensate for laser drift in intensity, enhancing the accuracy of Faraday rotation measurements.

Career Highlights: Charles R Christensen is currently employed by the US Government as represented by the Secretary of the Army. His work in this capacity has

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