| 摘要 |
One embodiment of the present invention provides a method for calibrating a rotary encoder including a rotatable disk including at least two index points located along a circumferentially extending row. These index points contain information specifying an angular position of the index point. This allows the rotary encoder to be calibrated by turning it through a sufficient angular displacement to ensure that an index point passes over a sensor. This sufficient angular displacement is less than a complete revolution because there are multiple index points along the circumference of the disk. This design allows a rotary encoder to be calibrated without turning it through a complete revolution. This is advantageous where turning the rotary encoder through a complete rotation is not possible or is inconvenient, for example in applications such as a wind direction indicator, a rudder position indicator or a joystick. Thus, one embodiment of the present invention includes a method for calibrating a rotary encoder including a rotatable disk with at least two index points located along a circumferentially extending row on the rotatable disk. The method includes turning the rotary encoder through a sufficient angular displacement to ensure that an index point passes over a first sensor in the rotary encoder, the sufficient angular displacement being less than a complete revolution. The method also includes reading an index point signal through the first sensor, and decoding the index point signal to obtain an angular position value for the index point. The method additionally includes using the angular position value to calibrate the rotary encoder.
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