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Living in a Sensor-Driven World: Exploring the Realm of Hall Sensors
1. Exploring Hall Sensors
Hall sensors are devices designed to detect magnetic fields, commonly used to measure magnetic field strength. The output voltage of a Hall sensor is directly proportional to the magnetic field intensity passing through it.
Applications of Hall Effect Sensors: Proximity Detection, Positioning, Speed Sensing, and Current Sensing
Example: When you bring a magnet close to a Hall sensor, it emits a signal. You can then perform a predefined action based on that signal.
2. Working Principles of Hall Sensors
Hall sensors operate based on the Hall effect principle.
The Hall Effect is a physical phenomenon observed when a magnetic field is applied perpendicular to a Hall bar carrying an electric current.
- When an electric current flows through a conductor, electrons move in a straight path.
- Placing the material in a magnetic field and running an electric current through it causes a force to act on them, causing them to deviate from their original path. This force is the Lorentz force.
- In general, in this example, the electron stream will bend as shown in the diagram.
- With more electrons on the right side of the material, it creates a difference in voltage between the two sides. The magnitude of this voltage is proportional to the current and the magnetic field intensity.
3. Real-Life Applications of Hall Sensors
Hall sensors have numerous practical applications, such as product counting, installing on doors to detect unauthorized entry, or attaching to the frame of a bicycle with a magnet on the wheel to measure speed.
The Hall Effect is also applied in various sensors in automobiles, including position sensors for crankshafts, camshafts, wheel speed, throttle position, accelerator pedal, and more.
We've just explored Hall sensors, their principles, and applications in daily life. Thank you for following along. See you in the next articles!
