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# Hall effect and sensors

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Hall effect sensor is a reliable sensor working on the principle of Hall Effect. It can be used to sense position or R

Hall effect sensor is a reliable sensor working on the principle of Hall Effect. It can be used to sense position or R

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### Transcript

• 1. HALL EFFECT AND SENSORS
• 2. Switches and Sensors There are many methods to detect the positions of the surfaces such as landing gear positions or landing gear doors. The are the possible sensors/ switches. ◦ Mechanical switch actuated by linkages or the door itself. ◦ Reed switch. ◦ Proximity switch ◦ Hall effect sensor.
• 3. Mechanical Versus Electronic The mechanical switches have moving parts, which will wear off. It is effected by environmental and vibration. The proximity and hall effect sensors have to moving parts and can be hermetically sealed. ◦ These sensors can last much longer. ◦ It is easier to test the system.
• 4. Hall Effect PrincipleA thin sheet of semiconducting material (Hall element) through which a currentis passed. The output connections are perpendicular to the direction of current.When no magnetic field is present, current distribution is uniform and nopotential difference is seen across the output.
• 5. Hall Effect with magnetic fieldWhen a perpendicular magnetic field is present, a Lorentz force is exerted on the current. This force disturbs the current distribution, resulting in a potential difference (voltage) across the output. This voltage is the Hall voltage (VH). The interaction of the magnetic field and the current is shown in equation.
• 6. A Simple Sensor  Take note of the elements.. ◦ Hall elements ◦ Amplifier ◦ Transistor switchThe sensor will detect the target and a small voltage is induced by the Hallelement. The voltage is amplified and switch the transister on.
• 7. Hall Effect Sensor used for RPMsensor
• 8. RESOURCES My Blog CAA UK Recommended Books Title Author Aircraft Electricity and Eisman 0-02-801859-1 Electronics Art of Electronics Horowitz 0-521-37095-7 Horowitz /Hill /Hill Elements of Electronics Hickey/ 0070286957 Villines Learning Modern Aviation Helfrich 0-13-118803-8 Electronicselectronics-tutorials.ws/electromagnetism/ Micro Electronics in E Pallet 0-273-08612-Xhall-effect.html Aircraft systems