213:, they still offer several significant advantages. The first is low cost - coils of wire and magnets are relatively inexpensive. Unfortunately, the low cost of the transducer is partially offset by the cost of the additional signal-processing circuitry needed to recover a useful signal. And because the magnitude of the signal developed by the VR sensor is proportional to target speed, it is difficult to design circuitry to accommodate very-low-speed signals. A given VR-sensing system has a definite limit as to how slow the target can move and still develop a usable signal. An alternative but more expensive technology is
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coil varies. When the gear tooth is close to the sensor, the flux is at a maximum. When the tooth is further away, the flux drops off. The moving target results in a time-varying flux that induces a proportional voltage in the coil. Subsequent electronics are then used to process this signal to get a waveform that can be more readily counted and timed. This system has been employed in automotive electronic ignition and
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To measure angular position or rotational speed of a shaft, a toothed ring made of ferrous material can be attached to the shaft. As the teeth of the rotating wheel (or other target features) pass by the face of the magnet, the amount of magnetic flux passing through the magnet and consequently the
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is limited by the characteristics of the materials used in the device, with appropriate construction VR sensors can be made to operate at temperatures in excess of 300 °C. An example of such an extreme application is sensing the turbine speed of a jet engine or engine cam shaft and crankshaft
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from ON semiconductor. An integrated VR sensor interface circuit like the MAX9924 features a differential input stage to provide enhanced noise immunity, Precision
Amplifier and Comparator with user enabled Internal Adaptive Peak Threshold or user programmed external threshold to provide a wide
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VR sensors need waveform shaping for their output to be digitally readable. The normal output of a VR sensor is an analog signal, shaped much like a sine wave. The frequency and amplitude of the analog signal is proportional to the target's velocity. This waveform needs to be squared up, and
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flattened off by a comparator like electronic chip to be digitally readable. While discrete VR sensor interface circuits can be implemented, the semiconductor industry also offers integrated solutions. Examples are the
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Speed sensors used in automobile transmissions are used to measure the rotational speed (angular velocity) of shafts within the transmission. The engine control unit or
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With more complex circuitry and the addition of software and specific mechanical hardware, a VR sensor can also provide measurements of linear velocity,
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A pickup used in an electric guitar (or other musical instrument) detects vibrations of the metallic "strings". See
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One area in which VR sensors excel, however, is in high-temperature applications. Because
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dynamic range and zero-crossing detection circuit to provide accurate phase
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can determine the position of a mechanical link in a piece of industrial equipment.
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VR sensor interface IC from Maxim
Integrated products,
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VR sensor amplifier from
National Semiconductor and
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242:"What Is a Reluctor Ring?"
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