Position transducer
First Claim
1. A position transducer comprising:
- a movable modulating device configured to move to various positions, means for producing at least one analog signal varying periodically with the various positions of the modulating device, an analog to digital conversion system connected to receive the analog signal and arranged to repeatedly convert the analog signal into digital information, the digital information representing the position of the modulating device within at least one half period of movement of the modulating device, and digital computing means connected to the analog to digital conversion system for receiving and processing the digital information for transforming the digital information into digital values of a sinus wave or curve, the digital computing means comprising storage means for storing information on deviations of the periodic variation of the analog signal from a sinusoidal shape having a constant amplitude for all periods of movement of the modulating device.
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Accused Products
Abstract
A position transducer has a moving modulating portion that can move to various positions through rotation, for example. The position transducer provides at least one analog signal that varies periodically with the moving position of the modulating portion, where the movement of the modulating portion has a period. The analog signal is provided to a converter that converts the analog signal into digital information which is applied to a computing arrangement to provide information as to the position of the modulating portion by using at least one transformation including stored information as to deviations of the periodic variation of the analog signal relative to a sinusoidal shape having a constant amplitude for all periods of movement of the modulating portion.
54 Citations
16 Claims
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1. A position transducer comprising:
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a movable modulating device configured to move to various positions, means for producing at least one analog signal varying periodically with the various positions of the modulating device, an analog to digital conversion system connected to receive the analog signal and arranged to repeatedly convert the analog signal into digital information, the digital information representing the position of the modulating device within at least one half period of movement of the modulating device, and digital computing means connected to the analog to digital conversion system for receiving and processing the digital information for transforming the digital information into digital values of a sinus wave or curve, the digital computing means comprising storage means for storing information on deviations of the periodic variation of the analog signal from a sinusoidal shape having a constant amplitude for all periods of movement of the modulating device. - View Dependent Claims (2, 3, 4)
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5. A position transducer having:
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a movable modulating device configured to move to various positions;
at least two channels of primary analog entities each one varying periodically with the position of the modulating device, the movement of the modulating device having a period and the primary analog entities of the at least two channels having a phase difference of between 60 and 120 degrees;
conversion means for converting intensities of the primary analog entities of the at least two channels to digital information comprising at least two respective digitized intensity values; and
digital computing means connected to the conversion means for receiving the digital information, wherein the digital computing means are arranged to convert the at least two digitized intensity values to a value within one period representing the position of the modulating device using at least one transformation utilizing information on deviations of the periodic variation of the primary analog entities from a sinusoidal shape having a constant amplitude for all periods of movement of the modulating device. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification