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Solid State Magnetic Field Sensor With Zero Power Consumption
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DOI：10.1109/TCPMT.2013.2279796.png)
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Abstract
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This paper introduces a new type of solid-state magnetic field sensor that is similar in size to a Hall effect sensor and that offers a sensitivity that is approximately an order of magnitude better than a Hall effect sensor. The significant advantage of the new sensor, however, is that it consumes no power. The sensor consists of a radioactive beta-particle source and a silicon p-n junction. If no magnetic field is applied, the beta particles enter the p-n junction and generate a steady dc voltage. Under the influence of a magnetic field, however, the beta particles (or secondary electrons generated therefrom) follow a curved path and miss the p-n junction, and the magnitude of the output voltage drops. The new sensor will be very advantageous in battery-powered consumer products applications because it consumes no power.
Keywords:
Beta-particle detectors
beta-particle sources
betavoltaics
hall-effect sensor
magnetic field sensor
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