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EE 4BD4 Lecture 14
Position Sensors
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Types of Sensors• Potentiometers and linear resistors • Capacitive sensors (mm distances, e.g.
capacitive microphone)• Linear variable differential transformer (LVDT)• Hall Effect sensors• Optical encoders• Accelerometers
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Basic Approach (not direction sensitive)
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Phase –Sensitive Detector for Direction
• Excitation signal between 50 Hz and 25kHz (10 times greater than frequency of movement)
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Alternate Processing Approach
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AD598 Signal Conditioner (Simplified)
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Hall Effect Voltage VH
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Analog Devices Magnetic Field Sensor(Linear output)
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Setting Gain of the Chip
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