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APPLICATION OF THE HALL EFFECT TO BASIC MEASUREMENTS
OHIO SEMICONDUCTORS INC COLUMBUS
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A study was made of the practicability of utilizing the Hall effect for making two specific types of basic measurements, namely for measurement of current in a conductor and the measurement of microwave power in a waveguide. As a result of the study, a laboratory model of a D. C. Hall effect milliammeter with range of 5-0-5 ma, 50-0-50 ma, and 500-0-500 ma was successfully constructed. Methods of overcoming such problems as drift, ohmic unbalance in the Hall probe and spurious magnetic fields are discussed. The basic theory relating to the use of the Hall effect as a microwave power meter is reviewed. Details of the experimental data taken with InAs and Ge probes are discussed. Data showing that a power meter for specific load conditions can be constructed are shown. The large magnitude of the output voltage from the Hall element casts doubt on its being a Hall voltage. An hypothesis discussing the possibility of the output voltage arising from the Seebeck Effect is forwarded. A recommendation is made that a Hall assembly containing no junctions in the waveguide be fabricated. This junctionless assembly could be used in future work to prove or disprove the presence of the Seebeck voltage. Author
APPROVED FOR PUBLIC RELEASE